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CHAPTER 6 CALLABLESTATEMENT
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The fourth example invokes _demoOracleSyntaxProcedureBindByNameWithDefault(), which demonstrates how to use Oracle syntax to invoke a procedure using binding by named parameter, with one of the parameters having a default value: _demoOracleSyntaxProcedureBindByNameWithDefault( conn ); The final example invokes _demoOracleSyntaxProcedureBindByNameUpdate(), which demonstrates how to use Oracle syntax to invoke a procedure that performs an update and uses binding by named parameter: _demoOracleSyntaxProcedureBindByNameUpdate( conn ); } catch (SQLException e) { // print stack trace. JDBCUtil.printException( e ); } finally { // close the connection in finally clause JDBCUtil.close( conn ); } } The definition of each of the procedures begins as follows, starting with _demoSql92SyntaxProcedureBindByIndex() (please see the interspersed comments for further details): //////////// PRIVATE SECTION //////////////// private static void _demoSql92SyntaxProcedureBindByIndex( Connection conn ) throws SQLException { System.out.println( "Example 1, SQL 92 syntax, calling a procedure, " + "binding by index" ); int inputEmpNo = 7369; CallableStatement cstmt = null; ResultSet rset = null; try { // The procedure invoked below has a signature of: // procedure get_emp_details_proc( p_empno in number, // p_emp_details_cursor out sys_refcursor ) First, we formulate a CallableStatement string using the SQL92 syntax: String sql92Style = "{ call callable_stmt_demo.get_emp_details_proc( , ) }"; Next, we create the CallableStatement object: cstmt = conn.prepareCall( sql92Style );
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CHAPTER 6 CALLABLESTATEMENT
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Then we bind the input value using parameter by index: cstmt.setInt(1, inputEmpNo ); We register the output value using the method registerOutParameter(): cstmt.registerOutParameter( 2, OracleTypes.CURSOR ); We are now ready to execute the procedure: cstmt.execute(); Next, we retrieve the result set (which is the second parameter). We loop through the result set to print it out, followed by the finally clause, in which we release JDBC resources: rset = (ResultSet) cstmt.getObject( 2 ); // print the result while (rset.next()) { int empNo = rset.getInt ( 1 ); String empName = rset.getString ( 2 ); String empJob = rset.getString ( 3 ); System.out.println( empNo + " " + empName + " " + empJob ); } } finally { // release JDBC resources in finally clause. JDBCUtil.close( rset ); JDBCUtil.close( cstmt ); } } Next is the definition of _demoOracleSyntaxFunctionBindByIndex(): private static void _demoOracleSyntaxFunctionBindByIndex( Connection conn ) throws SQLException { System.out.println( "\nExample 2, Oracle syntax, calling a function," + " binding by index" ); int inputEmpNo = 7369; ResultSet rset = null; CallableStatement cstmt = null; try { // The function invoked below has a signature of: // function get_emp_details_func( p_empno in number ) // return sys_refcursor
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CHAPTER 6 CALLABLESTATEMENT
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We formulate a CallableStatement string using the Oracle syntax: String oracleStyle = "begin := callable_stmt_demo.get_emp_details_func( ); end;"; We create the CallableStatement object: cstmt = conn.prepareCall( oracleStyle ); And then we bind the input variable and register the out parameter: cstmt.setInt(2, inputEmpNo ); cstmt.registerOutParameter( 1, OracleTypes.CURSOR ); Next, we execute the query, get the result set, and print the query results: cstmt.execute(); rset = (ResultSet) cstmt.getObject( 1 ); // print the result while (rset.next()) { int empNo = rset.getInt ( 1 ); String empName = rset.getString ( 2 ); String empJob = rset.getString ( 3 ); System.out.println( empNo + " " + empName + " " + empJob ); } } finally { // release JDBC resources in finally clause. JDBCUtil.close( rset ); JDBCUtil.close( cstmt ); } } The definition of _demoOracleSyntaxProcedureBindByName() follows: private static void _demoOracleSyntaxProcedureBindByName( Connection conn ) throws SQLException { System.out.println( "\nExample 3, Oracle syntax, calling a procedure," + " bind by name" ); int inputEmpNo = 7369; ResultSet rset = null; CallableStatement cstmt = null; try { // The procedure invoked below has a signature of: // procedure get_emp_details_proc( p_empno in number, // p_emp_details_cursor out sys_refcursor )
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// formulate a CallableStatement string using SQL92 // syntax String oracleStyle = "begin callable_stmt_demo.get_emp_details_proc( , ); end;"; // create the CallableStatement object cstmt = conn.prepareCall( oracleStyle ); Note how we use p_empno as the parameter name. This is the formal parameter name in the procedure: // bind the input value by name cstmt.setInt("p_empno", inputEmpNo ); // register the output value cstmt.registerOutParameter( "p_emp_details_cursor", OracleTypes.CURSOR ); // execute the query cstmt.execute(); We use the formal parameter again while retrieving results: rset = (ResultSet) cstmt.getObject( "p_emp_details_cursor" ); // print the result while (rset.next()) { int empNo = rset.getInt ( 1 ); String empName = rset.getString ( 2 ); String empJob = rset.getString ( 3 ); System.out.println( empNo + " " + empName + " " + empJob ); } } finally { // release JDBC resources in finally clause. JDBCUtil.close( rset ); JDBCUtil.close( cstmt ); } } The definition of _demoOracleSyntaxProcedureBindByNameWithDefaul() demonstrates how binding by name makes it easier to invoke a procedure with default values: private static void _demoOracleSyntaxProcedureBindByNameWithDefault( Connection conn ) throws SQLException { System.out.println( "\nExample 4, Oracle syntax, calling a procedure," + " named parameter (with default value)" ); int inputEmpNo = 7369; ResultSet rset = null;
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