java Jdbc
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The document provides an overview of JDBC (Java Database Connectivity), detailing its purpose as an API for connecting Java applications to various databases. It describes the four types of JDBC drivers: Type-1 (JDBC-ODBC Bridge), Type-2 (Native-API), Type-3 (Network Protocol), and Type-4 (Thin driver), highlighting their advantages and disadvantages. Additionally, it outlines key classes and interfaces within the java.sql package, including methods for managing database connections and executing SQL statements.
java Jdbc
- 2. Introduction •It is an API (Application Programming Interface) •Used to connect JAVA application with database •Interact with different types of databases like, MS Access, MySQL, Oracle, SQL Server, PostgreSQL, Sybase 07/01/16 2
- 3. JDBC Driver •Type-1 Driver ( JDBC-ODBC Bridge) •Type-2 Driver (Native-API Partly Java Driver / Partly Java) •Type-3 Driver (Network Protocol Driver / Pure Java to Middleware) •Type-4 Driver (Thin Driver / Pure Java Direct to Database) 07/01/16 3
- 4. Type-1 Driver ( JDBC-ODBC Bridge) •Act as a bridge between JDBC and other database connectivity mechanism (ODBC) •Converts JDBC calls into ODBC calls and redirects the request to ODBC driver •Sun provides a JDBC-ODBC Bridge Driver 07/01/16 4
- 5. Type-1 Driver ( JDBC-ODBC Bridge) cont… •Advantages Easy to use Allow easy connectivity to all database supported by the ODBC Driver •Disadvantages Slow execution time Dependent on ODBC Driver Uses Java JNI (Native Interface) to make ODBC call 07/01/16 5
- 6. Type-2 Driver (Native-API Partly Java Driver / Partly Java) •Converts JDBC calls into calls to the client API for that database •Client JDBC Driver Vendor Client DB Library DB 07/01/16 6
- 7. Type-2 Driver (Native-API Partly Java Driver / Partly Java) cont… •Advantages Better performance than Type-1 because no JDBC to ODBC translation is needed. •Disadvantages Vendor client library needs to be installed on the client machine. Can not be used in web-based application due the client side s/w needed. Not all database have a client side library. 07/01/16 7
- 8. Type-3 Driver (Network Protocol Driver / Pure Java to Middleware) •Follow three tier communication approach •Can interface to multiple databases •Client JDBC Driver Middleware-Net Server Any Database 07/01/16 8
- 9. Type-3 Driver (Network Protocol Driver / Pure Java to Middleware) cont… •Advantages Does not require any native library to be installed. Database Independency Provide facility to switch over from one database to another database •Disadvantages Slow due to increase number of network call 07/01/16 9
- 10. Type-4 Driver (Thin Driver / Pure Java Direct to Database) •Interact directly with database •Does not require any native database library •Called pure Java Driver •Also known as Thin Driver 07/01/16 10
- 11. Type-4 Driver (Thin Driver / Pure Java Direct to Database) •Advantages Does not require any native library Does not require any Middleware server Better Performance than other driver •Disadvantages Slow due to increase number of n/w call At client side, a separate driver is needed for each database 07/01/16 11
- 12. Classes / Interfaces (java.sql package) 07/01/16 12
- 13. Connection Interface Method Description void close() This method frees the connection object’s database and other JDBC resources void commit() This method makes all the changes made since the last commit or rollback. It throws SQLException boolean isClosed() This method returns “true” if the connection is close else returns “false” void rollback() This method undoes all changes made to the database Statement createStatement() This method creates a Statement object for sending SQL statements to the database. throws SQLException CallableStatement prepareCall(String s) This method creates a CallableStatement object for calling stored procedures. It throws SQLException PreparedStatement prepareStatement(String s) This method creates a PreparedStatement object for sending SQL statements with or without IN parameter. It throws SQLException. 07/01/16 13
- 14. Statement Interface Method Description void close() this method releases the statement object’s database and JDBC resources boolean execute(String s) This method executes the SQL statement specified by s. ResultSet executeQuery(String s) This method executes the SQL statement specified by s and returns the ResultSet object int executeUpdate(String s) This method executes the SQL statement specified by s. These statements may be INSERT, UPDATE or DELETE int getMaxRows() This method returns the maximum number of rows that are generated by the executeQuery() method ResultSet getResultSet() This method retrieves the ResultSet generated by the execute() method 07/01/16 14
Editor's Notes
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