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mysql> insert into emps_roles(badge_number, role) values('11111', 'mgr'); mysql> insert into emps_roles(badge_number, role) values('11111', 'dev'); mysql> insert into emps_roles(badge_number, role) values('22222', 'dba'); mysql> insert into emps_roles(badge_number, role) values('22222', 'a'); ERROR 1216: Cannot add or update a child row: a foreign key constraint fails mysql> insert into emps_roles(badge_number, role) values('2222', 'a'); ERROR 1216: Cannot add or update a child row: a foreign key constraint fails mysql> select * from emps_table; +--------------+------+----------------+ | badge_number | name | email | +--------------+------+----------------+ | 11111 | Alex | alex@yahoo.com | | 22222 | Mary | mary@yahoo.com | +--------------+------+----------------+ 2 rows in set (0.02 sec) mysql> select * from roles_table; +------+------------------------+ | role | description | +------+------------------------+ | dba | database administrator | | dev | database developer | | mgr | database manager | +------+------------------------+ 3 rows in set (0.00 sec) mysql> select * from emps_roles; +--------------+------+ | badge_number | role | +--------------+------+ | 11111 | dev | | 11111 | mgr | | 22222 | dba | +--------------+------+ 3 rows in set (0.00 sec)

The Connection interface has several methods that control the commit and rollback updates to a database. These methods are as follows: void commit(): Makes all changes permanent that were made since the previous commit/rollback and releases any database locks currently held by this Connection object. boolean getAutoCommit(): Retrieves the current autocommit mode for this Connection object. boolean isReadOnly(): Retrieves whether this Connection object is in read-only mode. void setReadOnly(boolean readOnly): Puts this connection in read-only mode as a hint to the driver to enable database optimizations. void rollback(): Undoes all changes made in the current transaction and releases any database locks currently held by this Connection object. void rollback(Savepoint savepoint): Undoes all changes made after the given Savepoint object was set. void setAutoCommit(boolean autoCommit): Sets this connection s autocommit mode to the given state. Savepoint setSavepoint(): Creates an unnamed savepoint in the current transaction and returns the new Savepoint object that represents it. Savepoint setSavepoint(String name): Creates a savepoint with the given name in the current transaction and returns the new Savepoint object that represents it. void setTransactionIsolation(int level): Attempts to change the transaction isolation level for this Connection object to the one given. By default, a database connection commits all updates to the database immediately and automatically. For example, executing an UPDATE SQL query immediately commits the change. The following code shows how to disable autocommits and explicitly commit: import java.sql.Connection; import java.sql.SQLException; import jcb.util.DatabaseUtil; ... Connection conn = null; try { conn = <get-a-database-connection>; // // disable autocommit // conn.setAutoCommit(false); // execute any number of SQL updates... // // commit updates

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// conn.commit(); } catch (SQLException e) { // // Roll back update // conn.rollback(); } finally { DatabaseUtil.close(conn); }

When the rows shown in Figure 7-23 are hovered over, you want a plus icon to be displayed on their left. When the row is expanded, it should display the records in the respective range and the plus icon should be replaced with a minus icon.

import java.sql.*; import javax.servlet.*; import javax.servlet.http.*;

Some database operations (such as truncation errors) can cause a warning (such as a SQLWarning) that is not handled by an exception (such as a SQLException). You must explicitly check for these database warnings. An example of a warning is a data truncation error during a read operation (see the DataTruncation class). You have three places to check for a warning; the following code recipes check for each of these in turn: Connection object Statement object ResultSet object

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