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This method s parameters are as follows: catalog: A catalog name; it must match the catalog name as it is stored in the database. "" retrieves those without a catalog; null means that the catalog name should not be used to narrow the search. schema: A schema name; it must match the schema name as it is stored in the database. "" retrieves those without a schema; null means that the schema name should not be used to narrow the search. table: A table name; it must match the table name as it is stored in the database. This method returns a ResultSet in which each row is a primary key column description. If a database access error occurs, it throws a SQLException. The Solution: Using DatabaseMetaData.getImportedKeys() When using the DatabaseMetaData.getImportedKeys() method, try to pass all required parameters with non-null and non-empty values. Passing null/empty values might slow down getting the results from this method. If your database is not changing often, you may cache the returned values on the server side. This method will give you a good idea about the dependency of your database tables. /** * class name: jcb.meta.DatabaseMetaDataTool * * 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. *
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CHAPTER 3 DATABASE METADATA, PART 2
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* @param conn the Connection object * @param catalog database catalog. * @param schema database schema. * @param tableName name of a table in the database. * @return the list (as an XML string) of the primary key columns * that are referenced by a table's foreign key columns * * @exception Failed to get the ExportedKeys for a given table. */ public static String getImportedKeys(java.sql.Connection conn, String catalog, String schema, String tableName) throws Exception { ResultSet rs = null; try { if ((tableName == null) || (tableName.length() == 0)) { return null; } DatabaseMetaData meta = conn.getMetaData(); if (meta == null) { return null; } // // // // // rs if } StringBuffer buffer = new StringBuffer(); buffer.append("<importedKeys>"); while (rs.next()) { String pkTableName = DatabaseUtil.getTrimmedString(rs, "PKTABLE_NAME"); String pkColumnName = DatabaseUtil.getTrimmedString(rs, "PKCOLUMN_NAME"); String fkTableName = DatabaseUtil.getTrimmedString(rs, "FKTABLE_NAME"); String fkColumnName = DatabaseUtil.getTrimmedString(rs, "FKCOLUMN_NAME"); int fkSequence = rs.getInt("KEY_SEQ");
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The Oracle database stores its table names as uppercase, if you pass a table name in lowercase characters, it will not work. MySQL database does not care if table name is uppercase/lowercase. = meta.getImportedKeys(catalog, schema, tableName.toUpperCase()); (rs == null) { return null;
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CHAPTER 3 DATABASE METADATA, PART 2
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buffer.append("<importedKey>"); buffer.append("<catalog>"); buffer.append(catalog); buffer.append("</catalog>"); buffer.append("<schema>"); buffer.append(schema); buffer.append("</schema>"); buffer.append("<tableName>"); buffer.append(tableName); buffer.append("</tableName>"); buffer.append("<pkTableName>"); buffer.append(pkTableName); buffer.append("</pkTableName>"); buffer.append("<pkColumnName>"); buffer.append(pkColumnName); buffer.append("</pkColumnName>"); buffer.append("<fkTableName>"); buffer.append(fkTableName); buffer.append("</fkTableName>"); buffer.append("<fkColumnName>"); buffer.append(fkColumnName); buffer.append("</fkColumnName>"); buffer.append("<fkSequence>"); buffer.append(fkSequence); buffer.append("</fkSequence>"); buffer.append("</importedKey>"); } buffer.append("</importedKeys>"); return buffer.toString(); } finally { DatabaseUtil.close(rs); } } Oracle Client Test Program import java.util.*; import java.io.*; import java.sql.*; import jcb.db.*; import jcb.meta.*; public class DemoGetImportedKeys_Oracle {
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CHAPTER 3 DATABASE METADATA, PART 2
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public static Connection getConnection() throws Exception { String driver = "oracle.jdbc.driver.OracleDriver"; String url = "jdbc:oracle:thin:@localhost:1521:caspian"; String username = "scott"; String password = "tiger"; Class.forName(driver); // load Oracle 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("------DemoGetImportedKeys_Oracle begin---------"); conn = getConnection(); System.out.println("DemoGetImportedKeys_Oracle: conn="+conn); String tableName = args[0]; System.out.println("tableName=" + tableName); String importedKeysAsXML = DatabaseMetaDataTool.getImportedKeys(conn, null, "SCOTT", tableName); System.out.println("importedKeysAsXML=" + importedKeysAsXML); System.out.println("------DemoGetImportedKeys_Oracle end---------"); } catch(Exception e){ e.printStackTrace(); System.exit(1); } finally { // release database resources DatabaseUtil.close(conn); } } } Running the Client Test Program $ javac DemoGetImportedKeys_Oracle.java $ java DemoGetImportedKeys_Oracle roles_table ------DemoGetImportedKeys_Oracle begin--------DemoGetImportedKeys_Oracle: conn=oracle.jdbc.driver.OracleConnection@1c6f579 tableName=roles_table importedKeysAsXML= <importedKeys> </importedKeys>
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CHAPTER 3 DATABASE METADATA, PART 2
------DemoGetImportedKeys_Oracle end--------$ java DemoGetImportedKeys_Oracle emps_table ------DemoGetImportedKeys_Oracle begin--------DemoGetImportedKeys_Oracle: conn=oracle.jdbc.driver.OracleConnection@1c6f579 tableName=emps_table importedKeysAsXML= <importedKeys> </importedKeys> ------DemoGetImportedKeys_Oracle end--------$ java DemoGetImportedKeys_Oracle emps_roles ------DemoGetImportedKeys_Oracle begin--------DemoGetImportedKeys_Oracle: conn=oracle.jdbc.driver.OracleConnection@1c6f579 tableName=emps_roles importedKeysAsXML= <importedKeys> <importedKey> <catalog>null</catalog> <schema>SCOTT</schema> <tableName>emps_roles</tableName> <pkTableName>EMPS_TABLE</pkTableName> <pkColumnName>BADGE_NUMBER</pkColumnName> <fkTableName>EMPS_ROLES</fkTableName> <fkColumnName>BADGE_NUMBER</fkColumnName> <fkSequence>1</fkSequence> </importedKey> <importedKey> <catalog>null</catalog> <schema>SCOTT</schema> <tableName>emps_roles</tableName> <pkTableName>ROLES_TABLE</pkTableName> <pkColumnName>ROLE</pkColumnName> <fkTableName>EMPS_ROLES</fkTableName> <fkColumnName>ROLE</fkColumnName> <fkSequence>1</fkSequence> </importedKey> </importedKeys> ------DemoGetImportedKeys_Oracle end---------
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