java Simple Java JDBC Program To Execute SQL Select Query

Below is a sample Java JDBC program which takes database connection string as command line arguments and returns the SQL select query output

 

Replace the SQL Select query in the below code with the desired select query and modify the variables depending upon the result you wish to display in the output.

 
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
 
public class Run_SQL_Select {
 
    static Connection sqlConn = null;
    static Statement sqlStmt = null;
    static ResultSet sqlResultset = null;
 
    public static void main(String[] args) throws SQLException {
 
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
        } catch (ClassNotFoundException exception) {
            System.out.println("Oracle Driver Class Not found Exception: " + exception.toString());
            return;
        }
 
        DriverManager.setLoginTimeout(5);
 
        try {
            String db_host=args[0];
            String db_serviceName=args[1];
            String db_username=args[2];
            String db_password=args[3];
            String jdbc_conn_string="jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST="+db_host+")(PORT=1521))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME="+db_serviceName+")))";
            sqlConn = DriverManager.getConnection(jdbc_conn_string, db_username, db_password);
        } 
        catch (SQLException e) {
            System.out.println("Connection Failed! Check output console");
            e.printStackTrace();
            System.exit(1);
            return;
        }
 
        sqlStmt = sqlConn.createStatement();
 
        sqlResultset = sqlStmt.executeQuery("SELECT ABC AS COLUMN1, PQR AS COLUMN2, XYZ AS COLUMN3 from SAMPLE_TABLE");

         System.out.println("COLUMN1_Title COLUMN2_Title COLUMN3_Title");

      while(sqlResultset.next()){
         String var1 = sqlResultset.getString("COLUMN1");
         String var2 = sqlResultset.getString("COLUMN2");
         String var3 = sqlResultset.getString("COLUMN3");      
         System.out.println(var1 + " " + var2 + " " + var3);
      }
      
         sqlResultset.close(); 
        
    }
 
}
 

Copy paste the above code in a file having same name as the class name.

 

Replace the SQL select query with the query of your choice.

 

Compile the code:

 
javac Run_SQL_Select.java
 

Execute the code with the class name:

 
java Run_SQL_Select ${DB_HOST} ${DB_SID} ${DB_USER} ${DB_PASSWORD}
 
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