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public static Connection getConnection() throws Exception { String driver = "org.gjt.mm.mysql.Driver"; String url = "jdbc:mysql://localhost/octopus"; String username = "root"; String password = "root"; Class.forName(driver); // load MySQL driver return DriverManager.getConnection(url, username, password); } public static void main(String[] args) { Connection conn = null; Statement stmt = null; ResultSet rs = null; try { System.out.println("------DemoGetExportedKeys_MySQL begin---------"); conn = getConnection(); System.out.println("DemoGetExportedKeys_MySQL: conn="+conn); String exportedKeysAsXML = DatabaseMetaDataTool.getExportedKeys( conn, "octopus", null, "DEPT_TABLE"); System.out.println("exportedKeysAsXML=" + exportedKeysAsXML); System.out.println("------DemoGetExportedKeys_MySQL end---------"); } catch(Exception e){ e.printStackTrace(); System.exit(1); } finally { // release database resources DatabaseUtil.close(conn); } } } Running the Client Test Program $ javac DemoGetExportedKeys_MySQL.java $ java DemoGetExportedKeys_MySQL ------DemoGetExportedKeys_MySQL begin--------DemoGetExportedKeys_MySQL: conn=com.mysql.jdbc.Connection@a1807c exportedKeysAsXML= <exportedKeys> <exportedKey> <catalog>octopus</catalog> <schema>null</schema> <tableName>DEPT_TABLE</tableName>

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This shows how to run the solution for the MySQL database: $ javac Demo_DataTruncation_1_MySQL.java $ java Demo_DataTruncation_1 mysql -- Demo_DataTruncation_1 begin -conn=com.mysql.jdbc.Connection@143c8b3 ---------------- got DataTruncation exception -Data truncation error: 0 bytes should have been Written (Error:) 0 number of bytes of data actually transferred. -- printStackTrace -com.mysql.jdbc.MysqlDataTruncation: Data truncation: Data truncated for column 'name' at row 1 at com.mysql.jdbc.SQLError.convertShowWarningsToSQLWarnings(SQLError.java:695) at com.mysql.jdbc.MysqlIO.scanForAndThrowDataTruncation(MysqlIO.java:3317) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1741) at com.mysql.jdbc.Connection.execSQL(Connection.java:2370) at com.mysql.jdbc.Connection.execSQL(Connection.java:2297) at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1289) at Demo_DataTruncation_1.main(Demo_DataTruncation_1.java:54)

Figure 3-27. The text This is Bold menu appears in a word balloon when the Bold button is moused over. Similarly, when the mouse pointer is moved over the Italic button, its foreground and background color will be changed and the word balloon with the text This is Italic menu will appear, as shown in Figure 3-28.

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As you can see, this example tried to insert ginger123456789 for the name column; because the size of this data (15) is larger than 10 (the maximum size of a name column), the exception takes place. MySQL s JDBC driver chops the data and inserts only the maximum allowed, as follows: mysql> select * from animals_table; +-----+------------+ | id | name | +-----+------------+ | 111 | ginger1234 | +-----+------------+ 1 row in set (0.00 sec)

<fkTableName>emp_table</fkTableName> <fkColumnName>dept</fkColumnName> <fkSequence>1</fkSequence> </exportedKey> </exportedKeys> ------DemoGetExportedKeys_MySQL end---------

This is the Oracle database before running the solution: SQL> select id, name from animals_table; no rows selected SQL>

Figure 3-28. The text This is Italic menu appears in a word balloon when the Italic button is moused over.

This shows how to run the solution for the Oracle database: $ javac Demo_DataTruncation_1.java java Demo_DataTruncation_1 oracle -- Demo_DataTruncation_1 begin -conn=oracle.jdbc.driver.T4CConnection@6e293a ---------------- got SQLException exception -Database error message: ORA-12899: value too large for column "SCOTT"."ANIMALS_T ABLE"."NAME" (actual: 15, maximum: 10)

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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 referenced by a table s foreign key columns (the primary keys imported by a table). The ResultSet object s records are ordered by the 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 or 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, we ll look at these concepts in a simple example, and then we ll develop a JDBC solution and a test client program to show these relationships using DatabaseMetaData.getImportedKeys(). Oracle Database Setup Let s create three tables (roles_table, emps_table, and emps_roles) and define the PK and FK. Figure 3-2 illustrates the relationships of these tables.

As you can see, this example tried to insert ginger123456789 for the name column; because the size of this data (15) is larger than 10 (the maximum size of a name column), the exception happens. Oracle s JDBC driver (unlike MySQL) does not insert the record, as follows: SQL> select id, name from animals_table; no rows selected SQL>

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