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CHAPTER 6 CALLABLESTATEMENT
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Here, the first parameter is an in (input) parameter, and the second parameter is an out (output) parameter. We can bind the input parameter (which is parameter number 1) by ordinal number (the index of the parameter) or by named parameter. The following snippet illustrates binding by parameter index: CallableStatement cstmt = null; try { . . . String sql92Style = "{ call callable_stmt_demo.get_emp_details_proc( , ) }"; // create the CallableStatement object cstmt = conn.prepareCall( sql92Style ); cstmt.setInt(1, inputEmpNo ); . . . } The last line in the preceding code tells us that the first parameter is an int and its bind value is inputEmpNo. In 10g, we can also use named parameters to bind input parameters.
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Note Binding or registering by named parameter is a new feature in 10g. Also, you can t mix named
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parameter binding and ordinal parameter binding for the same statement-related code.
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To use named parameters in the preceding example, we replace the last statement in the code snippet with the following: cstmt.setInt("p_empno", inputEmpNo ); Here, p_empno is the formal parameter name of the first parameter of the procedure get_emp_details_proc. This parameter name does not necessarily appear anywhere in the SQL string. This differs from the setXXXatName() method of the OraclePreparedStatement interface discussed in the previous chapter, whose first argument is a substring of the SQL string.
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Note As of 10g Release 1, there s no support for named parameters for a PL/SQL function, because
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there s no name of the returned parameter, and you can t mix and match binding by name and binding by ordinal parameter index.
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Named parameters are especially useful if we have one or more parameters in a stored procedure with default values. In this case, we can specify only the parameters that do not have default values. For example, consider the following procedure in the package callable_stmt_demo:
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CHAPTER 6 CALLABLESTATEMENT
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procedure get_emps_with_high_sal( p_deptno in number, p_sal_limit in number default 2000 , p_emp_details_cursor out sys_refcursor ) is begin open p_emp_details_cursor for select empno, ename, job, sal from emp where deptno = p_deptno and sal > p_sal_limit; end; It returns a set of employees for a given department who earn a salary higher than a given limit as a ref cursor in its out parameter. The default value for the passed salary limit is 2,000. If we use ordinal parameter binding, we have to bind both input parameters (p_deptno and p_sal_limit), even if the default value of the p_sal_limit parameter is acceptable to us. However, if we use named parameters, we can just bind the input parameter p_deptno as follows (note that our SQL string has only the number of s that we are actually binding, which in this case is two: one for the in parameter p_deptno and the other for the out parameter p_emp_details_cursor): try { // formulate a CallableStatement string using SQL92 // syntax String oracleStyle = "begin callable_stmt_demo.get_emps_with_high_sal( , ); end;"; // create the CallableStatement object cstmt = conn.prepareCall( oracleStyle ); // bind the input value by name cstmt.setInt("p_deptno", 10 ); // no need to pass the second parameter "p_sal_limit" // which gets a default value of 2000 . . .
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Registering Output (out or in out) Parameters
To get results back from a stored procedure, we have to register any output parameters (out or in out parameters) before executing the callable statement. Here, too, we can choose to use ordinal binding or named parameter binding (starting from Oracle 10g). We use the registerOutParameter() method. The following code snippet illustrates how to register the cursor output parameter for the procedure callable_stmt_demo.get_emp_details_proc: CallableStatement cstmt = null; try { . . . // register the output value
CHAPTER 6 CALLABLESTATEMENT
cstmt.registerOutParameter( 2, OracleTypes.CURSOR ); . . . } As in the case of binding the input parameter, the first parameter in registerOutParameter() is the formal parameter index of the called procedure, and the second parameter is the type of the output parameter (in this case, a ResultSet that maps to OracleTypes.CURSOR). For binding by name, we would use the formal parameter name instead of the index number, as follows: try { . . . // register the output value cstmt.registerOutParameter( p_emp_details_cursor , OracleTypes.CURSOR ); . . . }
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