Natural Left Join of tables using DBCP

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Natural Left Join of tables using DBCP
Posted on: April 5, 2010 at 12:00 AM

This tutorial demonstrate natural left join of the tables using DBCP.

Code:


import java.sql.*;

import org.apache.commons.dbcp.BasicDataSource;



public class NaturalLeftJoin {

  public static void main(String[] args) {

    BasicDataSource bds = new BasicDataSource();

    bds.setDriverClassName("com.mysql.jdbc.Driver");

    bds.setUrl("jdbc:mysql://localhost:3306/mydb");

    bds.setUsername("root");

    bds.setPassword("");

    try {

      Connection con = bds.getConnection();

      try {

        Statement st = con.createStatement();

        ResultSet res = st.executeQuery("SELECT *FROM " + "employee"

        + " NATURAL LEFT JOIN " + "salary");

        System.out.println("Emp_name" + "\t" + "Emp_sal");

        while (res.next()) {

          String name = res.getString("emp_name");

          int sal1 = res.getInt("sal");

          System.out.println(name + "\t\t" + sal1);

        }

      } catch (SQLException s) {

        System.out.println("SQL statement is not executed!");

      }

    } catch (Exception e) {

      e.printStackTrace();

    }

  }

}

Before running this program you need to make two tables. Below shown two tables and record stored in it.

Salary

Employee

Directory structure of files:

In the lib folder place all required jar files ie. commons-collections.jar, commons-dbcp.jar, commons-pool.jar, j2ee.jar and mysql-connector-java-5.1.7-bin.jar

In the pathset.bat write following statement

set classpath=.;lib/commons-collections.jar;lib/commons-dbcp.jar;lib/commons-pool.jar;lib/j2ee.jar;lib/mysql-connector-java-5.1.7-bin.jar

Output:

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