If I have code similar to the following:
let connection;
let preparedStatement;
connection = createConnectionSomehow();
connection.setAutoCommit(false);
preparedStatement = connection.prepareStatement(query1);
preparedStatement.executeUpdate();
preparedStatement = connection.prepareStatement(query2);
preparedStatement.executeUpdate();
connection.commit();
Will both queries be executed, or will the second query overwrite the first one?
In summary, when auto commit is set to false and you only commit at the end, both queries will be executed as a single atomic operation. The order of execution is usually sequential, but may vary depending on the database being used.
You can easily confirm this by running the code with either commenting out one of the operations or updating the same record with both queries.
Obtain Connection Method with AutoCommit Disabled
Connection getConnection() throws SQLException {
// Create and initialize the connection
Connection con = ...
con.setAutoCommit(false); // The AutoCommit is turned off by default
return con;
}
The setAutoCommit(false) method is included here to ensure that users of this function do not need to manually configure it.
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