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34 using mysql with java

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This document discusses using MySQL with Java applications. It provides an overview of JDBC and the Connector/J driver for connecting Java applications to MySQL databases. It also includes examples of Connector/J connection URLs and how to pass configuration parameters when connecting to MySQL from Java.

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David Bennett QA Engineer April 15th , 2015 Using MySQL with Java Q2 2014
www.percona.com2 Who are you? ● Java Experts, Intermediate, Beginners ● MySQL Experts, Intermediate, Beginners ● Developers, DBAs, System Admins ● Just interested
www.percona.com3 Me ● QA Engineer at Percona ● Designer/Developer/Consultant ● 20+ years in technology ● 15+ years working with MySQL ● 15+ years working with Java ● Focused on web apps ● Linux devotee ● I love MySQL, I like Java Dave Bennett
www.percona.com4 Basic Topology Java Application (Web, Service, Desktop) Java Runtime Engine (JRE) JDBC Interface JDBC Driver (Connector/J) MySQL
www.percona.com5 What is JDBC? ● A standardized interface between Java and SQL ● JDBC is to Java what ODBC is to Windows ● Virtually all Java/SQL applications use JDBC ● Like ODBC, JDBC is used more and more on Servers, Desktop use waning.
www.percona.com6 What is Connector/J? ● Most widely used JDBC Driver for MySQL today ● Started life in 1998 as MM.MySQL (M. Matthews) ● Acquired by MySQL AB in 2002 ● Owned by Oracle today, available under GPLv2 ● JDBC Type 4 – 100% Java – No Middleware
www.percona.com7 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
www.percona.com8 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
www.percona.com9 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
www.percona.com10 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
www.percona.com11 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
www.percona.com12 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
www.percona.com13 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
www.percona.com14 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
www.percona.com15 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
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www.percona.com22 Connector/J Basic* URL jdbc:mysql://[host][:port]/[database][?prop=val[&prop=val]] Where: is: host TCP/IP host (defaults to IPV4 127.0.0.1) port TCP/IP port (defaults to 3306) database Database name (defaults to none) prop A configuration property val The configuration property's value * There are more advanced options for other protocols (IPV6, Named Pipes), replication, failover, load balancing, etc...
www.percona.com23 Connector/J URL Examples jdbc:mysql:// Connect the MySQL server at 127.0.0.1 on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver Connect the MySQL server dbserver on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver:3307/mydb Connect the MySQL server dbserver on port 3307 using database mydb. jdbc:mysql://dbserver/mydb Connect the MySQL server dbserver on port 3306 using database mydb.
www.percona.com24 Connector/J URL Examples jdbc:mysql:// Connect the MySQL server at 127.0.0.1 on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver Connect the MySQL server dbserver on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver:3307/mydb Connect the MySQL server dbserver on port 3307 using database mydb. jdbc:mysql://dbserver/mydb Connect the MySQL server dbserver on port 3306 using database mydb.
www.percona.com25 Connector/J URL Examples jdbc:mysql:// Connect the MySQL server at 127.0.0.1 on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver Connect the MySQL server dbserver on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver:3307/mydb Connect the MySQL server dbserver on port 3307 using database mydb. jdbc:mysql://dbserver/mydb Connect the MySQL server dbserver on port 3306 using database mydb.
www.percona.com26 Connector/J URL Examples jdbc:mysql:// Connect the MySQL server at 127.0.0.1 on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver Connect the MySQL server dbserver on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver:3307/mydb Connect the MySQL server dbserver on port 3307 using database mydb. jdbc:mysql://dbserver/mydb Connect the MySQL server dbserver on port 3306 using database mydb.
www.percona.com27 Connector/J URL Examples jdbc:mysql:// Connect the MySQL server at 127.0.0.1 on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver Connect the MySQL server dbserver on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver:3307/mydb Connect the MySQL server dbserver on port 3307 using database mydb. jdbc:mysql://dbserver/mydb Connect the MySQL server dbserver on port 3306 using database mydb.
www.percona.com28 Connector/J parameters Passing in JDBC URL: dbProperties.load(MyClass.class.getClassLoader() .getResourceAsStream("db.properties")); Connection con = DriverManager.getConnection("jdbc:mysql://", dbProperties); Passing in a Properties file: Connection con = DriverManager.getConnection( "jdbc:mysql://host/db?autoReconnect=true&useConfigs=maxPerformance" ); MysqlDataSource mds=new MysqlDataSource(); mds.setUrl("jdbc:mysql://"); mds.setUser("user"); mds.setPassword("pwd"); mds.setAutoReconnect(true); mds.setUseConfigs("maxPerformance"); Connection con=mds.getConnection(); Passing from MysqlDataSource set*() methods:
www.percona.com29 Connector/J parameters Passing in JDBC URL: dbProperties.load(MyClass.class.getClassLoader() .getResourceAsStream("db.properties")); Connection con = DriverManager.getConnection("jdbc:mysql://", dbProperties); Passing in a Properties file: Connection con = DriverManager.getConnection( "jdbc:mysql://host/db?autoReconnect=true&useConfigs=maxPerformance" ); MysqlDataSource mds=new MysqlDataSource(); mds.setUrl("jdbc:mysql://"); mds.setUser("user"); mds.setPassword("pwd"); mds.setAutoReconnect(true); mds.setUseConfigs("maxPerformance"); Connection con=mds.getConnection(); Passing from MysqlDataSource set*() methods:
www.percona.com30 Connector/J parameters Passing in JDBC URL: dbProperties.load(MyClass.class.getClassLoader() .getResourceAsStream("db.properties")); Connection con = DriverManager.getConnection("jdbc:mysql://", dbProperties); Passing in a Properties file: Connection con = DriverManager.getConnection( "jdbc:mysql://host/db?autoReconnect=true&useConfigs=maxPerformance" ); MysqlDataSource mds=new MysqlDataSource(); mds.setUrl("jdbc:mysql://"); mds.setUser("user"); mds.setPassword("pwd"); mds.setAutoReconnect(true); mds.setUseConfigs("maxPerformance"); Connection con=mds.getConnection(); Passing from MysqlDataSource set*() methods:
www.percona.com31 Connector/J parameters Passing in JDBC URL: dbProperties.load(MyClass.class.getClassLoader() .getResourceAsStream("db.properties")); Connection con = DriverManager.getConnection("jdbc:mysql://", dbProperties); Passing in a Properties file: Connection con = DriverManager.getConnection( "jdbc:mysql://host/db?autoReconnect=true&useConfigs=maxPerformance" ); MysqlDataSource mds=new MysqlDataSource(); mds.setUrl("jdbc:mysql://"); mds.setUser("user"); mds.setPassword("pwd"); mds.setAutoReconnect(true); mds.setUseConfigs("maxPerformance"); Connection con=mds.getConnection(); Passing from MysqlDataSource set*() methods:
www.percona.com32 Generic JDBC App Example import java.io.IOException; import java.sql.*; import java.util.Properties; public class DBHello { public static void main(String[] args) throws SQLException,ClassNotFoundException,IOException { Properties dbp = new Properties(); dbp.load(DBHello.class.getClassLoader() .getResourceAsStream("db.properties")); Class.forName(dbp.getProperty("class")); Connection con = DriverManager.getConnection(dbp.getProperty("url"), dbp); Statement st = con.createStatement(); ResultSet rs = st.executeQuery(dbp.getProperty("versionQuery")); if (rs.next()) { System.out.printf("Hello from %sn",rs.getString("version")); } rs.close(); st.close(); con.close(); } }
www.percona.com33 Generic JDBC App Example import java.io.IOException; import java.sql.*; import java.util.Properties; public class DBHello { public static void main(String[] args) throws SQLException,ClassNotFoundException,IOException { Properties dbp = new Properties(); dbp.load(DBHello.class.getClassLoader() .getResourceAsStream("db.properties")); Class.forName(dbp.getProperty("class")); Connection con = DriverManager.getConnection(dbp.getProperty("url"), dbp); Statement st = con.createStatement(); ResultSet rs = st.executeQuery(dbp.getProperty("versionQuery")); if (rs.next()) { System.out.printf("Hello from %sn",rs.getString("version")); } rs.close(); st.close(); con.close(); } }
www.percona.com34 Generic JDBC App Example import java.io.IOException; import java.sql.*; import java.util.Properties; public class DBHello { public static void main(String[] args) throws SQLException,ClassNotFoundException,IOException { Properties dbp = new Properties(); dbp.load(DBHello.class.getClassLoader() .getResourceAsStream("db.properties")); Class.forName(dbp.getProperty("class")); Connection con = DriverManager.getConnection(dbp.getProperty("url"), dbp); Statement st = con.createStatement(); ResultSet rs = st.executeQuery(dbp.getProperty("versionQuery")); if (rs.next()) { System.out.printf("Hello from %sn",rs.getString("version")); } rs.close(); st.close(); con.close(); } }
www.percona.com35 Generic JDBC App Example db.properties configured for MySQL: # driver class=com.mysql.jdbc.Driver # connection url url=jdbc:mysql://localhost user=user password=pwd # parameters autoReconnect=true useConfigs=maxPerformance # version query versionQuery=SELECT CONCAT_WS(' ',@@version_comment,@@version, @@version_compile_os,@@version_compile_machine) AS `version` Returns: Hello from MySQL Community Server (GPL) 5.6.23-log Linux x86_64
www.percona.com36 Prepared Statements ● Security – Better protection from SQL injection attacks, parameters are sent separately, escaping unnecessary ● Performance – Prepared Statements are re-usable. Interpretation and Optimization happens only once. ● More Performance – Combined with Pooling/Caching. ● Use them whenever you can.
www.percona.com37 Let's do something useful ● Runs as a service, records storage capacity to a table ● Runs as a report, outputs capacity growth over time ● Load JDBC configuration from a Java properties file ● PreparedStatement Query with ResultSet ● Use and Reuse of PreparedStatement ● Batch inserts using addBatch/executeBatch ● Dynamic DDL creation DiskFreeChecker.java github.com/dbpercona/DiskFreeChecker
www.percona.com38 Prepared Statement Query pst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?"); pst.setString(1, hostname); pst.setTimestamp(2, ts); rs=pst.executeQuery(); while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe); } rs.close(); pst.close();
www.percona.com39 Prepared Statement Query pst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?"); pst.setString(1, hostname); pst.setTimestamp(2, ts); rs=pst.executeQuery(); while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe); } rs.close(); pst.close();
www.percona.com40 Prepared Statement Query pst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?"); pst.setString(1, hostname); pst.setTimestamp(2, ts); rs=pst.executeQuery(); while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe); } rs.close(); pst.close();
www.percona.com41 Prepared Statement Query pst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?"); pst.setString(1, hostname); pst.setTimestamp(2, ts); rs=pst.executeQuery(); while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe); } rs.close(); pst.close();
www.percona.com42 Prepared Statement Query pst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?"); pst.setString(1, hostname); pst.setTimestamp(2, ts); rs=pst.executeQuery(); while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe); } rs.close(); pst.close();
www.percona.com43 Prepared Statement Query pst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?"); pst.setString(1, hostname); pst.setTimestamp(2, ts); rs=pst.executeQuery(); while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe); } rs.close(); pst.close();
www.percona.com44 Prepared Statement Query pst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?"); pst.setString(1, hostname); pst.setTimestamp(2, ts); rs=pst.executeQuery(); while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe); } rs.close(); pst.close();
www.percona.com45 Prepared Statement Reuse pst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?"); // then pst.setBigDecimal(1, secondsBack); pst.setString(2, hostname); rs = pst.executeQuery(); if (rs.next()) { then = rs.getTimestamp(1); } rs.close(); // now pst.setInt(1, 0); rs = pst.executeQuery(); if (rs.next()) { now = rs.getTimestamp(1); } rs.close(); pst.close();
www.percona.com46 Prepared Statement Reuse pst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?"); // then pst.setBigDecimal(1, secondsBack); pst.setString(2, hostname); rs = pst.executeQuery(); if (rs.next()) { then = rs.getTimestamp(1); } rs.close(); // now pst.setInt(1, 0); rs = pst.executeQuery(); if (rs.next()) { now = rs.getTimestamp(1); } rs.close(); pst.close();
www.percona.com47 Prepared Statement Reuse pst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?"); // then pst.setBigDecimal(1, secondsBack); pst.setString(2, hostname); rs = pst.executeQuery(); if (rs.next()) { then = rs.getTimestamp(1); } rs.close(); // now pst.setInt(1, 0); rs = pst.executeQuery(); if (rs.next()) { now = rs.getTimestamp(1); } rs.close(); pst.close();
www.percona.com48 Prepared Statement Reuse pst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?"); // then pst.setBigDecimal(1, secondsBack); pst.setString(2, hostname); rs = pst.executeQuery(); if (rs.next()) { then = rs.getTimestamp(1); } rs.close(); // now pst.setInt(1, 0); rs = pst.executeQuery(); if (rs.next()) { now = rs.getTimestamp(1); } rs.close(); pst.close();
www.percona.com49 Prepared Statement Reuse pst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?"); // then pst.setBigDecimal(1, secondsBack); pst.setString(2, hostname); rs = pst.executeQuery(); if (rs.next()) { then = rs.getTimestamp(1); } rs.close(); // now pst.setInt(1, 0); rs = pst.executeQuery(); if (rs.next()) { now = rs.getTimestamp(1); } rs.close(); pst.close();
www.percona.com50 Prepared Statement Reuse pst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?"); // then pst.setBigDecimal(1, secondsBack); pst.setString(2, hostname); rs = pst.executeQuery(); if (rs.next()) { then = rs.getTimestamp(1); } rs.close(); // now pst.setInt(1, 0); rs = pst.executeQuery(); if (rs.next()) { now = rs.getTimestamp(1); } rs.close(); pst.close();
www.percona.com51 Prepared Statement Batches pst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)"); for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch } int[] inserts=pst.executeBatch(); // execute batch int totalInserts=0; for (int i : inserts) totalInserts += i; // compute total
www.percona.com52 Prepared Statement Batches pst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)"); for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch } int[] inserts=pst.executeBatch(); // execute batch int totalInserts=0; for (int i : inserts) totalInserts += i; // compute total
www.percona.com53 Prepared Statement Batches pst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)"); for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch } int[] inserts=pst.executeBatch(); // execute batch int totalInserts=0; for (int i : inserts) totalInserts += i; // compute total
www.percona.com54 Prepared Statement Batches pst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)"); for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch } int[] inserts=pst.executeBatch(); // execute batch int totalInserts=0; for (int i : inserts) totalInserts += i; // compute total
www.percona.com55 Prepared Statement Batches pst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)"); for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch } int[] inserts=pst.executeBatch(); // execute batch int totalInserts=0; for (int i : inserts) totalInserts += i; // compute total
www.percona.com56 Prepared Statement Batches pst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)"); for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch } int[] inserts=pst.executeBatch(); // execute batch int totalInserts=0; for (int i : inserts) totalInserts += i; // compute total
www.percona.com57 Prepared Statement Batches pst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)"); for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch } int[] inserts=pst.executeBatch(); // execute batch int totalInserts=0; for (int i : inserts) totalInserts += i; // compute total
www.percona.com58 Prepared Statement Writes int keepDays=30; String strKeepDays=dbp.getProperty("keep.days"); if (strKeepDays != null) keepDays = new Integer(strKeepDays).intValue(); pst = con.prepareStatement( "DELETE FROM diskfree WHERE `when` < ( NOW() - INTERVAL ? DAY)"); pst.setInt(1, keepDays); pst.execute(); int updateCount=pst.getUpdateCount(); if (updateCount > 0) System.out.println("Cleaned up "+updateCount+" old entries."); else System.out.println("No old entries to clean up."); pst.close();
www.percona.com59 int keepDays=30; String strKeepDays=dbp.getProperty("keep.days"); if (strKeepDays != null) keepDays = new Integer(strKeepDays).intValue(); pst = con.prepareStatement( "DELETE FROM diskfree WHERE `when` < ( NOW() - INTERVAL ? DAY)"); pst.setInt(1, keepDays); pst.execute(); int updateCount=pst.getUpdateCount(); if (updateCount > 0) System.out.println("Cleaned up "+updateCount+" old entries."); else System.out.println("No old entries to clean up."); pst.close(); Prepared Statement Writes
www.percona.com60 Prepared Statement Writes int keepDays=30; String strKeepDays=dbp.getProperty("keep.days"); if (strKeepDays != null) keepDays = new Integer(strKeepDays).intValue(); pst = con.prepareStatement( "DELETE FROM diskfree WHERE `when` < ( NOW() - INTERVAL ? DAY)"); pst.setInt(1, keepDays); pst.execute(); int updateCount=pst.getUpdateCount(); if (updateCount > 0) System.out.println("Cleaned up "+updateCount+" old entries."); else System.out.println("No old entries to clean up."); pst.close();
www.percona.com61 Prepared Statement Writes int keepDays=30; String strKeepDays=dbp.getProperty("keep.days"); if (strKeepDays != null) keepDays = new Integer(strKeepDays).intValue(); pst = con.prepareStatement( "DELETE FROM diskfree WHERE `when` < ( NOW() - INTERVAL ? DAY)"); pst.setInt(1, keepDays); pst.execute(); int updateCount=pst.getUpdateCount(); if (updateCount > 0) System.out.println("Cleaned up "+updateCount+" old entries."); else System.out.println("No old entries to clean up."); pst.close();
www.percona.com62 Prepared Statement Writes int keepDays=30; String strKeepDays=dbp.getProperty("keep.days"); if (strKeepDays != null) keepDays = new Integer(strKeepDays).intValue(); pst = con.prepareStatement( "DELETE FROM diskfree WHERE `when` < ( NOW() - INTERVAL ? DAY)"); pst.setInt(1, keepDays); pst.execute(); int updateCount=pst.getUpdateCount(); if (updateCount > 0) System.out.println("Cleaned up "+updateCount+" old entries."); else System.out.println("No old entries to clean up."); pst.close();
www.percona.com63 Performance parameters Parameter What it does cachePrepStmts=true If true, cache prepared statements on client side cacheCallableStmts=true If true, cache prepared stored procedure calls CacheServerConfiguration= true If true, reduces connect queries by caching server configuration variables. useLocalSessionState=true If true, reduces setup queries by using the local session state elideSetAutoCommits=true If true, only set autocommit if the server doesn't match the client autocommit setting. AlwaysSendSetIsolation= false If false, doesn't set the transaction isolation level on connect. Uses server default isolation level enableQueryTimeouts=false If false, disables query timeouts
www.percona.com64 Performance parameters Parameter What it does cachePrepStmts=true If true, cache prepared statements on client side cacheCallableStmts=true If true, cache prepared stored procedure calls CacheServerConfiguration= true If true, reduces connect queries by caching server configuration variables. useLocalSessionState=true If true, reduces setup queries by using the local session state elideSetAutoCommits=true If true, only set autocommit if the server doesn't match the client autocommit setting. AlwaysSendSetIsolation= false If false, doesn't set the transaction isolation level on connect. Uses server default isolation level enableQueryTimeouts=false If false, disables query timeouts useConfigs=maxPerformance
www.percona.com65 Debugging parameters Parameter What it does profileSQL=true If true, log query execution times to the configured logger. gatherPerfMetrics=true If true, collect performance metrics to the configured logger. useUsageAdvisor=true If true, inefficient use of JDBC and MySQL will logged to the configured logger as warnings. logSlowQueries=true If true, 'slow' queries will be logged to the configured logger (slowQueryThresholdMillis) explainSlowQueries=true If true, an 'EXPLAIN' statement for slow queries will be logged to the configured logger.
www.percona.com66 Debugging parameters Parameter What it does profileSQL=true If true, log query execution times to the configured logger. gatherPerfMetrics=true If true, collect performance metrics to the configured logger. useUsageAdvisor=true If true, inefficient use of JDBC and MySQL will logged to the configured logger as warnings. logSlowQueries=true If true, 'slow' queries will be logged to the configured logger (slowQueryThresholdMillis) explainSlowQueries=true If true, an 'EXPLAIN' statement for slow queries will be logged to the configured logger. useConfigs=fullDebug
www.percona.com67 Other Handy Parameters ● autoReconnect ● characterEncoding ● useInformationSchema ● maxRows
www.percona.com68 Alternative JDBC Driver ● MariaDB Java Client  Maintained-ed by MariaDB team  Fork from Drizzle JDBC  Stable release 1.1.8  Compatible with: ✔ MySQL ✔ Percona Server / PXC ✔ MariaDB
www.percona.com69 Alternative JDBC Driver ● Pros  Maybe be faster in some cases  It is under active development  Cons  Not as feature rich  Not as mature
www.percona.com70 What to learn about next ● Connection Pooling ● DBCP, C3P0, BoneCP ● JNDI / Container Managed ● DataSource, Spring ● Object Relational Mapping ● JPA, Hibernate, Spring
www.percona.com71 www.percona.com THANK YOU

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34 using mysql with java

  • 1. David Bennett QA Engineer April 15th , 2015 Using MySQL with Java Q2 2014
  • 2. www.percona.com2 Who are you? ● Java Experts, Intermediate, Beginners ● MySQL Experts, Intermediate, Beginners ● Developers, DBAs, System Admins ● Just interested
  • 3. www.percona.com3 Me ● QA Engineer at Percona ● Designer/Developer/Consultant ● 20+ years in technology ● 15+ years working with MySQL ● 15+ years working with Java ● Focused on web apps ● Linux devotee ● I love MySQL, I like Java Dave Bennett
  • 4. www.percona.com4 Basic Topology Java Application (Web, Service, Desktop) Java Runtime Engine (JRE) JDBC Interface JDBC Driver (Connector/J) MySQL
  • 5. www.percona.com5 What is JDBC? ● A standardized interface between Java and SQL ● JDBC is to Java what ODBC is to Windows ● Virtually all Java/SQL applications use JDBC ● Like ODBC, JDBC is used more and more on Servers, Desktop use waning.
  • 6. www.percona.com6 What is Connector/J? ● Most widely used JDBC Driver for MySQL today ● Started life in 1998 as MM.MySQL (M. Matthews) ● Acquired by MySQL AB in 2002 ● Owned by Oracle today, available under GPLv2 ● JDBC Type 4 – 100% Java – No Middleware
  • 7. www.percona.com7 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
  • 8. www.percona.com8 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
  • 9. www.percona.com9 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
  • 10. www.percona.com10 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
  • 11. www.percona.com11 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
  • 12. www.percona.com12 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
  • 13. www.percona.com13 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
  • 14. www.percona.com14 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
  • 15. www.percona.com15 import java.sql.*; public class MysqlVersion { public static void main(String[] args) throws SQLException,ClassNotFoundException { Class.forName( "com.mysql.jdbc.Driver" ); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test","user","pwd" ); Statement st = con.createStatement(); ResultSet rs = st.executeQuery( "SELECT concat('Hello from mysql ',version()) AS msg" ); if (rs.next()) { System.out.println(rs.getString("msg")); } rs.close(); st.close(); con.close(); } }
  • 22. www.percona.com22 Connector/J Basic* URL jdbc:mysql://[host][:port]/[database][?prop=val[&prop=val]] Where: is: host TCP/IP host (defaults to IPV4 127.0.0.1) port TCP/IP port (defaults to 3306) database Database name (defaults to none) prop A configuration property val The configuration property's value * There are more advanced options for other protocols (IPV6, Named Pipes), replication, failover, load balancing, etc...
  • 23. www.percona.com23 Connector/J URL Examples jdbc:mysql:// Connect the MySQL server at 127.0.0.1 on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver Connect the MySQL server dbserver on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver:3307/mydb Connect the MySQL server dbserver on port 3307 using database mydb. jdbc:mysql://dbserver/mydb Connect the MySQL server dbserver on port 3306 using database mydb.
  • 24. www.percona.com24 Connector/J URL Examples jdbc:mysql:// Connect the MySQL server at 127.0.0.1 on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver Connect the MySQL server dbserver on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver:3307/mydb Connect the MySQL server dbserver on port 3307 using database mydb. jdbc:mysql://dbserver/mydb Connect the MySQL server dbserver on port 3306 using database mydb.
  • 25. www.percona.com25 Connector/J URL Examples jdbc:mysql:// Connect the MySQL server at 127.0.0.1 on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver Connect the MySQL server dbserver on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver:3307/mydb Connect the MySQL server dbserver on port 3307 using database mydb. jdbc:mysql://dbserver/mydb Connect the MySQL server dbserver on port 3306 using database mydb.
  • 26. www.percona.com26 Connector/J URL Examples jdbc:mysql:// Connect the MySQL server at 127.0.0.1 on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver Connect the MySQL server dbserver on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver:3307/mydb Connect the MySQL server dbserver on port 3307 using database mydb. jdbc:mysql://dbserver/mydb Connect the MySQL server dbserver on port 3306 using database mydb.
  • 27. www.percona.com27 Connector/J URL Examples jdbc:mysql:// Connect the MySQL server at 127.0.0.1 on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver Connect the MySQL server dbserver on port 3306 without specifying a database. You must use Connection.setCatalog("{database}") or database.table reference in queries. jdbc:mysql://dbserver:3307/mydb Connect the MySQL server dbserver on port 3307 using database mydb. jdbc:mysql://dbserver/mydb Connect the MySQL server dbserver on port 3306 using database mydb.
  • 28. www.percona.com28 Connector/J parameters Passing in JDBC URL: dbProperties.load(MyClass.class.getClassLoader() .getResourceAsStream("db.properties")); Connection con = DriverManager.getConnection("jdbc:mysql://", dbProperties); Passing in a Properties file: Connection con = DriverManager.getConnection( "jdbc:mysql://host/db?autoReconnect=true&useConfigs=maxPerformance" ); MysqlDataSource mds=new MysqlDataSource(); mds.setUrl("jdbc:mysql://"); mds.setUser("user"); mds.setPassword("pwd"); mds.setAutoReconnect(true); mds.setUseConfigs("maxPerformance"); Connection con=mds.getConnection(); Passing from MysqlDataSource set*() methods:
  • 29. www.percona.com29 Connector/J parameters Passing in JDBC URL: dbProperties.load(MyClass.class.getClassLoader() .getResourceAsStream("db.properties")); Connection con = DriverManager.getConnection("jdbc:mysql://", dbProperties); Passing in a Properties file: Connection con = DriverManager.getConnection( "jdbc:mysql://host/db?autoReconnect=true&useConfigs=maxPerformance" ); MysqlDataSource mds=new MysqlDataSource(); mds.setUrl("jdbc:mysql://"); mds.setUser("user"); mds.setPassword("pwd"); mds.setAutoReconnect(true); mds.setUseConfigs("maxPerformance"); Connection con=mds.getConnection(); Passing from MysqlDataSource set*() methods:
  • 30. www.percona.com30 Connector/J parameters Passing in JDBC URL: dbProperties.load(MyClass.class.getClassLoader() .getResourceAsStream("db.properties")); Connection con = DriverManager.getConnection("jdbc:mysql://", dbProperties); Passing in a Properties file: Connection con = DriverManager.getConnection( "jdbc:mysql://host/db?autoReconnect=true&useConfigs=maxPerformance" ); MysqlDataSource mds=new MysqlDataSource(); mds.setUrl("jdbc:mysql://"); mds.setUser("user"); mds.setPassword("pwd"); mds.setAutoReconnect(true); mds.setUseConfigs("maxPerformance"); Connection con=mds.getConnection(); Passing from MysqlDataSource set*() methods:
  • 31. www.percona.com31 Connector/J parameters Passing in JDBC URL: dbProperties.load(MyClass.class.getClassLoader() .getResourceAsStream("db.properties")); Connection con = DriverManager.getConnection("jdbc:mysql://", dbProperties); Passing in a Properties file: Connection con = DriverManager.getConnection( "jdbc:mysql://host/db?autoReconnect=true&useConfigs=maxPerformance" ); MysqlDataSource mds=new MysqlDataSource(); mds.setUrl("jdbc:mysql://"); mds.setUser("user"); mds.setPassword("pwd"); mds.setAutoReconnect(true); mds.setUseConfigs("maxPerformance"); Connection con=mds.getConnection(); Passing from MysqlDataSource set*() methods:
  • 32. www.percona.com32 Generic JDBC App Example import java.io.IOException; import java.sql.*; import java.util.Properties; public class DBHello { public static void main(String[] args) throws SQLException,ClassNotFoundException,IOException { Properties dbp = new Properties(); dbp.load(DBHello.class.getClassLoader() .getResourceAsStream("db.properties")); Class.forName(dbp.getProperty("class")); Connection con = DriverManager.getConnection(dbp.getProperty("url"), dbp); Statement st = con.createStatement(); ResultSet rs = st.executeQuery(dbp.getProperty("versionQuery")); if (rs.next()) { System.out.printf("Hello from %sn",rs.getString("version")); } rs.close(); st.close(); con.close(); } }
  • 33. www.percona.com33 Generic JDBC App Example import java.io.IOException; import java.sql.*; import java.util.Properties; public class DBHello { public static void main(String[] args) throws SQLException,ClassNotFoundException,IOException { Properties dbp = new Properties(); dbp.load(DBHello.class.getClassLoader() .getResourceAsStream("db.properties")); Class.forName(dbp.getProperty("class")); Connection con = DriverManager.getConnection(dbp.getProperty("url"), dbp); Statement st = con.createStatement(); ResultSet rs = st.executeQuery(dbp.getProperty("versionQuery")); if (rs.next()) { System.out.printf("Hello from %sn",rs.getString("version")); } rs.close(); st.close(); con.close(); } }
  • 34. www.percona.com34 Generic JDBC App Example import java.io.IOException; import java.sql.*; import java.util.Properties; public class DBHello { public static void main(String[] args) throws SQLException,ClassNotFoundException,IOException { Properties dbp = new Properties(); dbp.load(DBHello.class.getClassLoader() .getResourceAsStream("db.properties")); Class.forName(dbp.getProperty("class")); Connection con = DriverManager.getConnection(dbp.getProperty("url"), dbp); Statement st = con.createStatement(); ResultSet rs = st.executeQuery(dbp.getProperty("versionQuery")); if (rs.next()) { System.out.printf("Hello from %sn",rs.getString("version")); } rs.close(); st.close(); con.close(); } }
  • 35. www.percona.com35 Generic JDBC App Example db.properties configured for MySQL: # driver class=com.mysql.jdbc.Driver # connection url url=jdbc:mysql://localhost user=user password=pwd # parameters autoReconnect=true useConfigs=maxPerformance # version query versionQuery=SELECT CONCAT_WS(' ',@@version_comment,@@version, @@version_compile_os,@@version_compile_machine) AS `version` Returns: Hello from MySQL Community Server (GPL) 5.6.23-log Linux x86_64
  • 36. www.percona.com36 Prepared Statements ● Security – Better protection from SQL injection attacks, parameters are sent separately, escaping unnecessary ● Performance – Prepared Statements are re-usable. Interpretation and Optimization happens only once. ● More Performance – Combined with Pooling/Caching. ● Use them whenever you can.
  • 37. www.percona.com37 Let's do something useful ● Runs as a service, records storage capacity to a table ● Runs as a report, outputs capacity growth over time ● Load JDBC configuration from a Java properties file ● PreparedStatement Query with ResultSet ● Use and Reuse of PreparedStatement ● Batch inserts using addBatch/executeBatch ● Dynamic DDL creation DiskFreeChecker.java github.com/dbpercona/DiskFreeChecker
  • 38. www.percona.com38 Prepared Statement Query pst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?"); pst.setString(1, hostname); pst.setTimestamp(2, ts); rs=pst.executeQuery(); while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe); } rs.close(); pst.close();
  • 39. www.percona.com39 Prepared Statement Query pst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?"); pst.setString(1, hostname); pst.setTimestamp(2, ts); rs=pst.executeQuery(); while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe); } rs.close(); pst.close();
  • 40. www.percona.com40 Prepared Statement Query pst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?"); pst.setString(1, hostname); pst.setTimestamp(2, ts); rs=pst.executeQuery(); while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe); } rs.close(); pst.close();
  • 41. www.percona.com41 Prepared Statement Query pst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?"); pst.setString(1, hostname); pst.setTimestamp(2, ts); rs=pst.executeQuery(); while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe); } rs.close(); pst.close();
  • 42. www.percona.com42 Prepared Statement Query pst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?"); pst.setString(1, hostname); pst.setTimestamp(2, ts); rs=pst.executeQuery(); while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe); } rs.close(); pst.close();
  • 43. www.percona.com43 Prepared Statement Query pst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?"); pst.setString(1, hostname); pst.setTimestamp(2, ts); rs=pst.executeQuery(); while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe); } rs.close(); pst.close();
  • 44. www.percona.com44 Prepared Statement Query pst=con.prepareStatement( "SELECT * FROM diskfree WHERE `hostname` = ? AND `when` = ?"); pst.setString(1, hostname); pst.setTimestamp(2, ts); rs=pst.executeQuery(); while (rs.next()) { DiskFreeEntry dfe=new DiskFreeEntry(); dfe.id = rs.getLong("id"); dfe.hostname = rs.getString("hostname"); dfe.fileSystemName = rs.getString("file_system_name"); dfe.totalSpace = rs.getLong("total_space"); dfe.spaceUsed = rs.getLong("space_used"); dfe.spaceFree = rs.getLong("space_free"); dfe.percentageUsed = rs.getBigDecimal("percentage_used"); dfe.fileSystemRoot = rs.getString("file_system_root"); dfe.when = rs.getTimestamp("file_system_root"); diskFreeEntries.put(dfe.fileSystemRoot,dfe); } rs.close(); pst.close();
  • 45. www.percona.com45 Prepared Statement Reuse pst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?"); // then pst.setBigDecimal(1, secondsBack); pst.setString(2, hostname); rs = pst.executeQuery(); if (rs.next()) { then = rs.getTimestamp(1); } rs.close(); // now pst.setInt(1, 0); rs = pst.executeQuery(); if (rs.next()) { now = rs.getTimestamp(1); } rs.close(); pst.close();
  • 46. www.percona.com46 Prepared Statement Reuse pst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?"); // then pst.setBigDecimal(1, secondsBack); pst.setString(2, hostname); rs = pst.executeQuery(); if (rs.next()) { then = rs.getTimestamp(1); } rs.close(); // now pst.setInt(1, 0); rs = pst.executeQuery(); if (rs.next()) { now = rs.getTimestamp(1); } rs.close(); pst.close();
  • 47. www.percona.com47 Prepared Statement Reuse pst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?"); // then pst.setBigDecimal(1, secondsBack); pst.setString(2, hostname); rs = pst.executeQuery(); if (rs.next()) { then = rs.getTimestamp(1); } rs.close(); // now pst.setInt(1, 0); rs = pst.executeQuery(); if (rs.next()) { now = rs.getTimestamp(1); } rs.close(); pst.close();
  • 48. www.percona.com48 Prepared Statement Reuse pst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?"); // then pst.setBigDecimal(1, secondsBack); pst.setString(2, hostname); rs = pst.executeQuery(); if (rs.next()) { then = rs.getTimestamp(1); } rs.close(); // now pst.setInt(1, 0); rs = pst.executeQuery(); if (rs.next()) { now = rs.getTimestamp(1); } rs.close(); pst.close();
  • 49. www.percona.com49 Prepared Statement Reuse pst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?"); // then pst.setBigDecimal(1, secondsBack); pst.setString(2, hostname); rs = pst.executeQuery(); if (rs.next()) { then = rs.getTimestamp(1); } rs.close(); // now pst.setInt(1, 0); rs = pst.executeQuery(); if (rs.next()) { now = rs.getTimestamp(1); } rs.close(); pst.close();
  • 50. www.percona.com50 Prepared Statement Reuse pst = con.prepareStatement("SELECT MAX(`when`) FROM diskfree " + "WHERE `when` < ( NOW() - INTERVAL ? SECOND ) " + "AND `hostname` = ?"); // then pst.setBigDecimal(1, secondsBack); pst.setString(2, hostname); rs = pst.executeQuery(); if (rs.next()) { then = rs.getTimestamp(1); } rs.close(); // now pst.setInt(1, 0); rs = pst.executeQuery(); if (rs.next()) { now = rs.getTimestamp(1); } rs.close(); pst.close();
  • 51. www.percona.com51 Prepared Statement Batches pst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)"); for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch } int[] inserts=pst.executeBatch(); // execute batch int totalInserts=0; for (int i : inserts) totalInserts += i; // compute total
  • 52. www.percona.com52 Prepared Statement Batches pst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)"); for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch } int[] inserts=pst.executeBatch(); // execute batch int totalInserts=0; for (int i : inserts) totalInserts += i; // compute total
  • 53. www.percona.com53 Prepared Statement Batches pst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)"); for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch } int[] inserts=pst.executeBatch(); // execute batch int totalInserts=0; for (int i : inserts) totalInserts += i; // compute total
  • 54. www.percona.com54 Prepared Statement Batches pst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)"); for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch } int[] inserts=pst.executeBatch(); // execute batch int totalInserts=0; for (int i : inserts) totalInserts += i; // compute total
  • 55. www.percona.com55 Prepared Statement Batches pst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)"); for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch } int[] inserts=pst.executeBatch(); // execute batch int totalInserts=0; for (int i : inserts) totalInserts += i; // compute total
  • 56. www.percona.com56 Prepared Statement Batches pst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)"); for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch } int[] inserts=pst.executeBatch(); // execute batch int totalInserts=0; for (int i : inserts) totalInserts += i; // compute total
  • 57. www.percona.com57 Prepared Statement Batches pst=con.prepareStatement( // prepare insert "INSERT INTO diskfree (`hostname`,`file_system_name`,"+ "`total_space`,`space_used`,`space_free`,`percentage_used`,"+ "`file_system_root`,`when`) VALUES (?,?,?,?,?,?,?,?)"); for (DiskFreeEntry diskFreeEntry : getDiskFreeEntries()) { pst.setString ( 1, diskFreeEntry.hostname ); pst.setString ( 2, diskFreeEntry.fileSystemName ); pst.setLong ( 3, diskFreeEntry.totalSpace ); pst.setLong ( 4, diskFreeEntry.spaceUsed ); pst.setLong ( 5, diskFreeEntry.spaceFree ); pst.setBigDecimal( 6, diskFreeEntry.percentageUsed ); pst.setString ( 7, diskFreeEntry.fileSystemRoot ); pst.setTimestamp ( 8, when ); pst.addBatch(); // add to batch } int[] inserts=pst.executeBatch(); // execute batch int totalInserts=0; for (int i : inserts) totalInserts += i; // compute total
  • 58. www.percona.com58 Prepared Statement Writes int keepDays=30; String strKeepDays=dbp.getProperty("keep.days"); if (strKeepDays != null) keepDays = new Integer(strKeepDays).intValue(); pst = con.prepareStatement( "DELETE FROM diskfree WHERE `when` < ( NOW() - INTERVAL ? DAY)"); pst.setInt(1, keepDays); pst.execute(); int updateCount=pst.getUpdateCount(); if (updateCount > 0) System.out.println("Cleaned up "+updateCount+" old entries."); else System.out.println("No old entries to clean up."); pst.close();
  • 59. www.percona.com59 int keepDays=30; String strKeepDays=dbp.getProperty("keep.days"); if (strKeepDays != null) keepDays = new Integer(strKeepDays).intValue(); pst = con.prepareStatement( "DELETE FROM diskfree WHERE `when` < ( NOW() - INTERVAL ? DAY)"); pst.setInt(1, keepDays); pst.execute(); int updateCount=pst.getUpdateCount(); if (updateCount > 0) System.out.println("Cleaned up "+updateCount+" old entries."); else System.out.println("No old entries to clean up."); pst.close(); Prepared Statement Writes
  • 60. www.percona.com60 Prepared Statement Writes int keepDays=30; String strKeepDays=dbp.getProperty("keep.days"); if (strKeepDays != null) keepDays = new Integer(strKeepDays).intValue(); pst = con.prepareStatement( "DELETE FROM diskfree WHERE `when` < ( NOW() - INTERVAL ? DAY)"); pst.setInt(1, keepDays); pst.execute(); int updateCount=pst.getUpdateCount(); if (updateCount > 0) System.out.println("Cleaned up "+updateCount+" old entries."); else System.out.println("No old entries to clean up."); pst.close();
  • 61. www.percona.com61 Prepared Statement Writes int keepDays=30; String strKeepDays=dbp.getProperty("keep.days"); if (strKeepDays != null) keepDays = new Integer(strKeepDays).intValue(); pst = con.prepareStatement( "DELETE FROM diskfree WHERE `when` < ( NOW() - INTERVAL ? DAY)"); pst.setInt(1, keepDays); pst.execute(); int updateCount=pst.getUpdateCount(); if (updateCount > 0) System.out.println("Cleaned up "+updateCount+" old entries."); else System.out.println("No old entries to clean up."); pst.close();
  • 62. www.percona.com62 Prepared Statement Writes int keepDays=30; String strKeepDays=dbp.getProperty("keep.days"); if (strKeepDays != null) keepDays = new Integer(strKeepDays).intValue(); pst = con.prepareStatement( "DELETE FROM diskfree WHERE `when` < ( NOW() - INTERVAL ? DAY)"); pst.setInt(1, keepDays); pst.execute(); int updateCount=pst.getUpdateCount(); if (updateCount > 0) System.out.println("Cleaned up "+updateCount+" old entries."); else System.out.println("No old entries to clean up."); pst.close();
  • 63. www.percona.com63 Performance parameters Parameter What it does cachePrepStmts=true If true, cache prepared statements on client side cacheCallableStmts=true If true, cache prepared stored procedure calls CacheServerConfiguration= true If true, reduces connect queries by caching server configuration variables. useLocalSessionState=true If true, reduces setup queries by using the local session state elideSetAutoCommits=true If true, only set autocommit if the server doesn't match the client autocommit setting. AlwaysSendSetIsolation= false If false, doesn't set the transaction isolation level on connect. Uses server default isolation level enableQueryTimeouts=false If false, disables query timeouts
  • 64. www.percona.com64 Performance parameters Parameter What it does cachePrepStmts=true If true, cache prepared statements on client side cacheCallableStmts=true If true, cache prepared stored procedure calls CacheServerConfiguration= true If true, reduces connect queries by caching server configuration variables. useLocalSessionState=true If true, reduces setup queries by using the local session state elideSetAutoCommits=true If true, only set autocommit if the server doesn't match the client autocommit setting. AlwaysSendSetIsolation= false If false, doesn't set the transaction isolation level on connect. Uses server default isolation level enableQueryTimeouts=false If false, disables query timeouts useConfigs=maxPerformance
  • 65. www.percona.com65 Debugging parameters Parameter What it does profileSQL=true If true, log query execution times to the configured logger. gatherPerfMetrics=true If true, collect performance metrics to the configured logger. useUsageAdvisor=true If true, inefficient use of JDBC and MySQL will logged to the configured logger as warnings. logSlowQueries=true If true, 'slow' queries will be logged to the configured logger (slowQueryThresholdMillis) explainSlowQueries=true If true, an 'EXPLAIN' statement for slow queries will be logged to the configured logger.
  • 66. www.percona.com66 Debugging parameters Parameter What it does profileSQL=true If true, log query execution times to the configured logger. gatherPerfMetrics=true If true, collect performance metrics to the configured logger. useUsageAdvisor=true If true, inefficient use of JDBC and MySQL will logged to the configured logger as warnings. logSlowQueries=true If true, 'slow' queries will be logged to the configured logger (slowQueryThresholdMillis) explainSlowQueries=true If true, an 'EXPLAIN' statement for slow queries will be logged to the configured logger. useConfigs=fullDebug
  • 68. www.percona.com68 Alternative JDBC Driver ● MariaDB Java Client  Maintained-ed by MariaDB team  Fork from Drizzle JDBC  Stable release 1.1.8  Compatible with: ✔ MySQL ✔ Percona Server / PXC ✔ MariaDB
  • 69. www.percona.com69 Alternative JDBC Driver ● Pros  Maybe be faster in some cases  It is under active development  Cons  Not as feature rich  Not as mature
  • 70. www.percona.com70 What to learn about next ● Connection Pooling ● DBCP, C3P0, BoneCP ● JNDI / Container Managed ● DataSource, Spring ● Object Relational Mapping ● JPA, Hibernate, Spring