Update a MySQL table with Java MySQL

For this, you need to use PreparedStatement in Java for update. Let us first create a table −

mysql> create table DemoTable(
   Id int,
   FirstName varchar(40)
);
Query OK, 0 rows affected (0.62 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values(100,'Chris');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values(111,'Mike');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable values(121,'Sam');
Query OK, 1 row affected (0.09 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable;

This will produce the following output −

+------+-----------+
| Id   | FirstName |
+------+-----------+
| 100  | Chris     |
| 111  | Mike      |
| 121  | Sam       |
+------+-----------+
3 rows in set (0.00 sec)

The Java code is as follows to update −

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
public class UpdateFromJava {
   public static void main(String[] args) {
      Connection con = null;
      PreparedStatement ps = null;
      try {
         con = DriverManager.getConnection("jdbc :mysql ://localhost :3306/web?" +
         "useSSL=false", "root", "123456");
         String query = "update DemoTable set FirstName=? where Id=? ";
         ps = con.prepareStatement(query);
         ps.setString(1, "Tom");
         ps.setInt(2, 100);
         ps.executeUpdate();
         System.out.println("Record is updated successfully......");
         } catch (Exception e) {
            e.printStackTrace();
      }
   }
}

Following the output of Java code −

Record is updated successfully......

The screenshot of the output is as follows −

Let us now check the FirstName column name value has been updated to ‘Tom’ or not with ID 100.

Following is the query to check records and display them again −

mysql> select * from DemoTable;

This will produce the following output −

+------+-----------+
| Id   | FirstName |
+------+-----------+
| 100  |       Tom |
| 111  |      Mike |
| 121  |       Sam |
+------+-----------+
3 rows in set (0.00 sec)

The snapshot of the output is as follows. The FirstName column updated successfully with Java-MySQL −