JDBC: Update the Database

Jakob Jenkov
Last update: 2014-06-23

In order to update the database you need to use a Statement. But, instead of calling the executeQuery() method, you call the executeUpdate() method.

There are two types of updates you can perform on a database:

  1. Update record values
  2. Delete records

The executeUpdate() method is used for both of these types of updates.

Updating Records

Here is an update record value example:

Statement statement = connection.createStatement();

String    sql       = "update people set name='John' where id=123";

int rowsAffected    = statement.executeUpdate(sql);

The rowsAffected returned by the statement.executeUpdate(sql) call, tells how many records in the database were affected by the SQL statement.

Deleting Records

Here is a delete record example:

Statement statement = connection.createStatement();

String    sql       = "delete from people where id=123";

int rowsAffected    = statement.executeUpdate(sql);

Again, the rowsAffected returned by the statement.executeUpdate(sql) call, tells how many records in the database were affected by the SQL statement.

Jakob Jenkov

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