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Subqueries are useful when you need to answer queries on the basis of as-yet unknown values, such as Which employees have a salary higher than the employee with the employee ID 9999 To answer such a question, a subquery or inner query is executed first (and only once). The result of this subquery is then used by the main or outer query. Here s the query: SQL> 2 3 4 5 6 SELECT first_name||last_name, dept FROM employee WHERE sal > (SELECT sal FROM emp WHERE empno= 9999);

We invoke various methods in the following code that demonstrate DML operations. Each method is explained along with its definition in detail as part of the program comments: // example demonstrating first way of selecting object - we use // getORAData() method of OracleResultSet. _demoSelectUsingGetORAData( connection ); // example demonstrating second way of selecting object - we use // getObject() method of ResultSet specifying a type map. _demoSelectUsingGetObject( connection ); // example demonstrating inserting object(s) _demoInsertUsingSetORAData( connection ); // example demonstrating inserting object(s)- second alternative _demoInsertUsingSetObject( connection ); // example demonstrating updating object(s) _demoUpdate( connection ); // example demonstrating deleting object(s) } finally { JDBCUtil.close ( connection ); } } Selecting Objects Using the getORAData() Method of OracleResultSet The method _demoSelectUsingGetORAData() uses the method getORAData() of the OracleResultSet interface. This method signature is public ORAData getORAData (int col_index, ORADataFactory factory) This method takes as input the column index of the data in our result set and an ORADataFactory instance. The method _demoSelectUsingGetORAData() follows: private static void _demoSelectUsingGetORAData( Connection connection) throws SQLException { PreparedStatement pstmt = null; OracleResultSet orset = null; try { String selectStmt = "select value(a) from address_table a"; pstmt = connection.prepareStatement ( selectStmt ); orset = (OracleResultSet) pstmt.executeQuery(); while ( orset.next() ) {

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A multiple-row subquery returns multiple rows in the output, so you need to use multiple-row comparison operators, such as IN, ANY, and ALL. Using a single-row operator with a multiple-row subquery returns this common Oracle error: ERROR: ORA-01427: single-row subquery returns more than one row

Multiple-column subqueries are queries where the inner query retrieves the values of more than one column. The rows in the subquery are then evaluated in the main query in pair-wise comparison, column by column and row by row.

Next, we invoke the getORAData() method of the OracleResultSet interface. Notice how we invoke the static method getORADataFactory() of the generated class MyAddressORAData: MyAddressORAData address = (MyAddressORAData) orset.getORAData(1, MyAddressORAData.getORADataFactory() ); System.out.println( address.getAddress() ); } } finally { JDBCUtil.close( orset ); JDBCUtil.close( pstmt ); } } Selecting Objects Using the getObject() Method of ResultSet The second option for selecting objects is to use the standard getObject(index, map) method specified by the ResultSet interface to retrieve data as instances of ORAData. In this case, we must have an entry in the type map that identifies the factory class. This becomes clearer in the definition of the method _demoSelectUsingGetObject() as follows: private static void _demoSelectUsingGetObject( Connection connection) throws SQLException, ClassNotFoundException { PreparedStatement pstmt = null; ResultSet rset = null; try { In the following code, we populate a type map that maps the address object type to the class MyAddressORAData: HashMap myMap = new HashMap(); myMap.put( "BENCHMARK.ADDRESS", Class.forName(MyAddressORAData.class.getName() ) ); String selectStmt = "select value(a) from address_table a"; pstmt = connection.prepareStatement ( selectStmt ); rset = pstmt.executeQuery(); while ( rset.next() ) { When retrieving the object using the getObject() method, we also pass the type map, which informs the JDBC driver which class the object type maps to: MyAddressORAData address = (MyAddressORAData) rset.getObject(1, myMap ); System.out.println( address.getAddress() ); } }

Correlated subqueries are more complex than regular subqueries and answer questions such as What are the names of all employees whose salary is below the average salary of their department The inner query computes the average salary, and the outer or main query gets the employee information. However, for each employee in the main (outer) query, the inner query has to be computed, because department averages depend on the department number of the employee in the outer query.

The EXISTS operator tests for the existence of rows in the inner query or subquery when you re using subqueries. The NOT EXISTS operator tests for the nonexistence of rows in the inner query. In the following statement, the EXISTS operator will be TRUE if the subquery returns at least one row: SQL> SELECT department_id FROM departments d WHERE EXISTS (SELECT * FROM employees e WHERE d.department_id = e.department_id);

Oracle Database 11g provides support for regular expressions that you can use as part of SQL statements. Regular expressions let you use special operators to manipulate strings or carry out a search.

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