Lecture 1. java database connectivity
Download as PPTX, PDF3 likes724 views
This document provides an overview of Java Database Connectivity (JDBC) and how to use it. It discusses how JDBC works by registering drivers, connecting to databases, and executing SQL statements. It also provides steps for configuring JDBC with Eclipse and Microsoft SQL Server, including downloading drivers and copying files. Examples are given for creating tables, executing queries with the Statement interface, and fetching data from the ResultSet. The document concludes by demonstrating how to properly close resources.
Lecture 1. java database connectivity
- 1. Java Database Connectivity Nangarhar University Computer Science faculty Fall semester 2014 Waheedullah Sulaimankhail
- 2. Overview 1. JDBC Introduction 2. JDBC Configuration 3. Practical Examples with JDBC
- 3. 1. JDBC introduction JDBC stands for Java Database Connectivity, which is a standard Java API for database-independent connectivity between the Java programming language and a wide range of databases. The JDBC library includes APIs for each of the tasks commonly associated with database usage
- 4. How JDBC works 1. Registering JDBC Driver 2. Making a connection to a database 3. Creating SQL or MySQL statements 4. Executing that SQL or MySQL queries in the database 5. Viewing & Modifying the resulting records
- 5. 2. JDBC Configuration We will use eclipse and Microsoft Sql Server So please install Eclipse and Ms Sql Server
- 6. Configuration . Add Sql Server Path to environment variable.
- 7. Configuration .. Download JDBC driver for Ms Sqlserver Download the sqljdbc_<version>_enu.exe to a temporary directory. Run sqljdbc_<version>_enu.exe (unzip it)
- 8. Configuration … Copy sqljdbc_auth.dll From this folder : …Microsoft JDBC Driver 4.0 for SQL Serversqljdbc_4.0enuauthx64 To C: windows / System32 folder
- 9. Add JDBC Driver for Ms Sql Server to Project properties in Eclipse
- 10. 3. Practical Examples with JDBC Setting Up JDBC Examples 3 important steps to set up JDBC 1. Write the import statements import java.sql.*; 2. Register JDBC Driver Class.forName("com.microsoft.sqlserver.jdbc.SQL ServerDriver"); 3. Creating connection and opening it Connection con = DriverManager.getConnection("jdbc:sqlserver://loc alhost:1433;databaseName=db_name;integrated Security=true","User","Pw");
- 11. Executing queries with JDBC After jdbc is set up we need to write queries and execute them. In sql server we create query and execute them. However in JDBC we need to create a statement and initialize the statement with object of connection class. And execute the query with an object of statement class.
- 12. Create statement and execute create table query Statement st = con.createStatement(); String query = "CREATE TABLE student " + "(id INTEGER not NULL, " + " name VARCHAR(255), " + " fname VARCHAR(255), " + " grade Varchar(255), " + " PRIMARY KEY ( id ))" ; St.executeUpdate(query); System.out.println(“New Table with name student is created ”);
- 13. Creating Select Query and executing Statement st= con.createStatement(); String query= "SELECT id, first, last, age FROM Employee"; ….. = st.executeQuery(query); executeQuery method returns a dataset so we need to store the outcome in a dataset We will rewrite the executeQuery method as above ResultSet rs = st.executeQuery(query); Now we need to fetch the data from our result set
- 14. Fetching data from data set Rs.next() // will fetch the next record (next row) To get each record we will run a while loop till the last record is reached While(rs.next()) { int id = rs.getInt("id"); // this will fetch the column named “id” // the same for all other columns which we want to fetch from this record System.out.println(“ID :”+id); // show the record }
- 15. Clearing the Environment Rs.close(); St.close(); Con.close();
- 16. Thanks for attention Download these slides from : https://app.box.com/s/62nb671lj6vsz23ylw7v