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DatabaseMetaData.getImportedKeys() returns a ResultSet object with data about foreign key columns, tables, sequence, and update and delete rules. DatabaseMetaData s getImportedKeys() returns a ResultSet that retrieves a description of the primary key columns for that object that are referenced by a table s foreign key columns (the primary keys imported by a table). The ResultSet object s records are ordered by column names PKTABLE_CAT, PKTABLE_SCHEM, PKTABLE_NAME, and KEY_SEQ. A primary key (PK) is a column or set of columns that uniquely identifies a row/record in a table. A foreign key (FK) is one or more columns in one table that are used as a primary key in another table. First, I show these concepts in a simple example, and then I develop a JDBC solution and a test client program to show these relationships using DatabaseMetaData. getImportedKeys().

* a given class and this object should be * easily accessible to clients. */ class ConnectionManager { ... }

Figure 7-21. The contents of the nested list item (collpased list item) are displayed when the item is clicked. When you select the plus icon (or the list item itself) of the list item Coffee, it will be expanded to show the list items in it, and the plus icon will be replaced with the minus icon, as shown in Figure 7-22.

The BCM has three factories: OracleConnectionFactory, MySqlConnectionFactory, and OdbcConnectionFactory. The main job of these factories is to produce Connection objects for clients.

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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, then the SQL INSERT operation will fail. SQL> create table emps_table ( badge_number varchar(5) not null, name varchar2(20) not null, email varchar2(20) not null, primary key (badge_number) ); SQL> create table roles_table ( role varchar2(5) not null, description varchar2(25) not null, primary key (role) ); SQL> create table emps_roles ( badge_number varchar2(5) not null, role varchar2(5) not null, CONSTRAINT pk_badge_number_role PRIMARY KEY (badge_number, role) ); SQL> alter table emps_roles add constraint fk_column_badge_number FOREIGN KEY (badge_number references emps_table(badge_number); SQL> alter table emps_roles add constraint fk_column_role FOREIGN KEY (role) references roles_table(role); insert into roles_table(role, description) values('dba', 'database administrator'); insert into roles_table(role, description) values('mgr', 'database manager'); insert into roles_table(role, description) values('dev', 'database developer'); insert into emps_table(badge_number, name, email) values('11111', 'Alex', 'alex@yahoo.com'); insert into emps_table(badge_number, name, email) values('22222', 'Mary', 'mary@yahoo.com'); insert into emps_roles(badge_number, role) values('11111', 'mgr'); insert into emps_roles(badge_number, role) values('11111', 'dev'); insert into emps_roles(badge_number, role) values('22222', 'dba');

The purpose of OracleConnectionFactory is to pass the right parameters to ConnectionFactory for creating Oracle connections. This class provides a default driver class and also provides a database URL prefix. (You need just to append the name of Oracle SID to it.) package jcb.bcm; import java.sql.*;

You have a table consisting of 15 rows where each row has 3 columns. The table represents student records. It initially displays three rows: Roll 101-105, Roll 106-110, and Roll 111-115. You want to see at most 5 records at a time; that is, if you hover over the Roll 101-105 row, it must be expanded to show the student records with roll numbers between 101 and 105.

/** * This class extends the abstract ConnectionFactory * for connecting to an Oracle database. * */ class OracleConnectionFactory extends ConnectionFactory { ... }

SQL> select * from roles_table; ROLE DESCRIPTION ----- ---------------------dba database administrator mgr database manager dev database developer SQL> select * from emps_table; BADGE NAME EMAIL ----- ---- -------------11111 Alex alex@yahoo.com 22222 Mary mary@yahoo.com SQL> select * from emps_roles; BADGE ROLE ----- ----11111 dev 11111 mgr 22222 dba SQL> commit; Commit complete. The signature of DatabaseMetaData.getImportedKeys() is public ResultSet getImportedKeys(String catalog, String schema, String table) throws SQLException This method retrieves a description of the primary key columns that are referenced by a table s foreign key columns (the primary keys imported by a table). They are ordered by PKTABLE_CAT, PKTABLE_SCHEM, PKTABLE_NAME, and KEY_SEQ. Each primary key column description has the columns shown in Table 9-3. Table 9-3. ResultSet Columns for getImportedKeys()

The purpose of MysqlConnectionFactory is to pass the right parameters to ConnectionFactory for creating connections. This class provides a default driver class and also provides a database URL prefix. (You need just to append the name of the MySQL database to it.) package jcb.bcm; import java.sql.*;

Start off by making an HTML file with a table element that has table headings and a table body consisting of 15 row (tr) elements, as shown here:

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