In this tutorial, you will learn how to do batch update of records using JDBC API.
In this tutorial, you will learn how to do batch update of records using JDBC API.In this tutorial, you will learn how to do batch update of records using JDBC API.
Batch Update :
When you want to update multiple records, then opening and closing MySql connection for every updating may cause communication overhead. So to reduce time and cost, we use batch update concept. We can update multiple rows using single connection in batch update process.
Following are the steps to write batch update process -
Example : In this example we are updating multiple records by using single MySql connection.
package jdbc; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import java.sql.Statement; class BatchUpdate { public static void main(String[] args) { System.out.println("Batch Update Example...."); Connection con = null; String url = "jdbc:mysql://localhost:3306/"; String dbName = "students"; String driverName = "com.mysql.jdbc.Driver"; String userName = "root"; String password = "root"; try { // Connecting to the database Class.forName(driverName); con = DriverManager.getConnection(url + dbName, userName, password); try { // creating object of Statement Statement st = con.createStatement(); // Setting false value of auto_commit con.setAutoCommit(false); // Creating SQL statement String sql = "UPDATE student SET course='MTech' WHERE roll_no=1"; // Adding to the batch st.addBatch(sql); sql = "UPDATE student SET course='BCA' WHERE roll_no=4"; st.addBatch(sql); sql = "UPDATE student SET course='MTech' WHERE roll_no=5"; st.addBatch(sql); // Executing all batch statements int[] counts = st.executeBatch(); con.commit(); System.out.println("Number of rows updated : " + counts.length); } catch (SQLException s) { System.out.println(s); } con.close(); } catch (Exception e) { e.printStackTrace(); } } }
Output :
Batch Update Example.... Number of rows updated : 3