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JAVA EXAMPLE PROGRAMS

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How to get primary key value (auto-generated keys) from inserted queries using JDBC?


Description:

When we are inserting a record into the database table and the primary key is an auto-increment or auto-generated key, then the insert query will generate it dynamically. The below example shows how to get this key after insert statement. After perfoming executeUpdate() method on PreparedStatement, call getGeneratedKeys() method on PreparedStatement. It will return you ResultSet, from which you can get auto increment column values.


Code:
package com.java2novice.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class MyAutoGeneratedKeys {

	public static void main(String a[]){
		
		Connection con = null;
		PreparedStatement pstmt = null;
		ResultSet rs = null;
		try {
			Class.forName("oracle.jdbc.driver.OracleDriver");
			con = DriverManager.
				getConnection("jdbc:oracle:thin:@<hostname>:<port num>:<DB name>"
					,"user","password");
			String query = "insert into emps (name, dept, salary) values (?,?,?)";
			pstmt = con.prepareStatement(query,Statement.RETURN_GENERATED_KEYS);
			pstmt.setString(1, "John");
			pstmt.setString(2, "Acc Dept");
			pstmt.setInt(3, 10000);
			pstmt.executeUpdate();
			rs = pstmt.getGeneratedKeys();
			if(rs != null && rs.next()){
				System.out.println("Generated Emp Id: "+rs.getInt(1));
			}

		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally{
			try{
				if(rs != null) rs.close();
				if(pstmt != null) pstmt.close();
				if(con != null) con.close();
			} catch(Exception ex){}
		}
	}

}
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List Of All JDBC Programs:

  1. How to create JDBC Connection?
  2. What is Statement & ResultSet in JDBC?
  3. How to execute and read select queries using JDBC?
  4. How to update a record in the database using JDBC?
  5. How to execute any type of query in JDBC?
  6. What are the types of JDBC Statements available?
  7. Write an example code for JDBC prepared statement.
  8. Write an example for JDBC prepared statement with ResultSet.
  9. How to get primary key value (auto-generated keys) from inserted queries using JDBC?
  10. Write a simple program for CallableStatement statement to execute stored procedure.
  11. Write a program for CallableStatement statement with stored procedure returns OUT parameters.
  12. Write a program for CallableStatement statement with batch execution.
  13. Write a program to execute SQL function using CallableStatement.
  14. Write a program to execute SQL cursors using CallableStatement.
  15. How to get column properties from ResultSet using ResultSetMetaData?
  16. Write an example for batch update using Statement.
  17. Write an example for batch update using PreparedStatement.
  18. What are the types of ResultSets in JDBC?
  19. Write an example for scrollable result set with read only mode.
  20. Write an example for updatable result set.
  21. How to insert an image into database table? or Write an example for inserting BLOB into table.
  22. How to read an image from database table? or Write an example for reading BLOB from table.
  23. What is DatabaseMetaData? Write an example code.
  24. How to get JDBC Connection object using properties file?
Knowledge Centre
Class, Constructor and Primitive data types
Class is a template for multiple objects with similar features and it is a blue print for objects. It defines a type of object according to the data the object can hold and the operations the object can perform. Constructor is a special kind of method that determines how an object is initialized when created. Primitive data types are 8 types and they are: byte, short, int, long, float, double, boolean, char.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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