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This code shows how to get the fetch size: import java.sql.ResultSet; import java.sql.Statement; import java.sql.Connection; import java.sql.SQLException; import jcb.util.DatabaseUtil; ... ResultSet rs = null; Statement stmt = null; Connection conn = null; try { conn = <get-a-database-connection>; // Get the fetch size of a statement stmt = conn.createStatement (); int fetchSize = stmt.getFetchSize(); // Get the fetch size of a result set rs = stmt.executeQuery("select author from books_table"); int fetchSize2 = rs.getFetchSize(); } catch (SQLException e) { // handle the exception } finally { DatabaseUtil.close(rs); DatabaseUtil.close(stmt); DatabaseUtil.close(conn); }

In the current version of MySQL (version 4.0.18), only InnoDB table types support the foreign key concept. According to MySQL, starting with MySQL 5.1, foreign keys will be supported for all table types, not just InnoDB. Let s create two tables (dept_table and emp_table) and define the PK and FK. Keep in mind that if you violate the PK and FK rules, the SQL INSERT operation will fail.

On hovering over any row, the group of five records nested inside that row will be displayed. For instance, on hovering over the Roll 101-105 row, we may get the rows shown in Figure 7-24, and the hovered-over row will be highlighted:

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This code shows how to set the fetch size: import java.sql.ResultSet; import java.sql.Statement; import java.sql.Connection; import java.sql.SQLException; import jcb.util.DatabaseUtil; ... ResultSet rs = null; Statement stmt = null; Connection conn = null; try { conn = <get-a-database-connection>; // Set the fetch size of a statement stmt = conn.createStatement(); stmt.setFetchSize(20);

// Create a result set, which will return only 20 rows rs = stmt.executeQuery("SELECT author FROM books_table"); // Change the fetch size on the result set // rs.setFetchSize(40); } catch (SQLException e) { // handle the exception } finally { DatabaseUtil.close(rs); DatabaseUtil.close(stmt); DatabaseUtil.close(conn); }

$ mysql --user=root --password=root Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1 to server version: 4.0.18-nt mysql> use octopus; Database changed mysql> create table emps_table ( -> badge_number varchar(5) not null, -> name varchar(20) not null, -> email varchar(20) not null, -> -> primary key (badge_number) -> ) TYPE=InnoDB; Query OK, 0 rows affected (0.24 sec) mysql> create table roles_table ( -> role varchar(5) not null, -> description varchar(25) not null, -> -> primary key (role) -> ) TYPE=InnoDB; Query OK, 0 rows affected (0.13 sec) mysql> create table emps_roles ( -> badge_number varchar(5) not null, -> role varchar(5) not null, -> -> primary key (badge_number, role), -> INDEX badge_number_index (badge_number), -> foreign key (badge_number) references emps_table(badge_number), -> INDEX role_index (role), -> foreign key (role) references roles_table(role) -> ) TYPE=InnoDB; Query OK, 0 rows affected (0.24 sec) mysql> insert into roles_table(role, description) values('dba', 'database administrator'); mysql> insert into roles_table(role, description) values('mgr', 'database manager'); mysql> insert into roles_table(role, description) values('dev', 'database developer'); mysql> insert into emps_table(badge_number, name, email) values('11111', 'Alex', 'alex@yahoo.com'); mysql> insert into emps_table(badge_number, name, email) values('22222', 'Mary', 'mary@yahoo.com');

Figure 7-24. Student records are displayed when the row designating their group is hovered over. Similarly, when the Roll 111-115 row is hovered over, the row will be highlighted and the student records that belong to that range of roll numbers will be displayed, as shown in Figure 7-25:

Given a connection, it is not possible to determine the driver that created the connection. Although the connection can return a driver name, the returned name cannot be used to find the driver. import java.sql.DatabaseMetaData; import java.sql.Connection; import java.sql.SQLException; import jcb.util.DatabaseUtil; ... Connection conn = null; try { conn = <get-a-valid-database-connection>; DatabaseMetaData dbmd = conn.getMetaData(); if (dbmd == null) { System.out.println("vendor does not support metadata"); } else { String driverName = dbmd.getDriverName(); } } catch (SQLException e) { // handle the exception } finally { DatabaseUtil.close(conn); } The best you can do is to use the same database URL that was used to create the Connection object: import java.sql.Driver; import java.sql.DriverManager; import java.sql.Connection; import java.sql.SQLException; import jcb.util.DatabaseUtil; ... Connection conn = null; try { // create connection from database URL conn = DriverManager.getConnection(url, username, password); // Get driver from database URL Driver driver = DriverManager.getDriver(url);

catch (SQLException e) { // handle the exception } finally { DatabaseUtil.close(conn); }

Figure 7-25. Once again, student records are displayed when the row designating their group is hovered over.

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