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Invoking Stored Procedures from JDBC
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Calling a stored procedure from Java using JDBC involves the following steps: 1. Formulate the CallableStatement string. 2. Create a CallableStatement object. 3. Bind input parameters. 4. Register output parameters. 5. Execute CallableStatement and retrieve the results. We ll go through each of these steps in the following sections.
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CHAPTER 6 CALLABLESTATEMENT
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Formulating the CallableStatement String
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There are two syntaxes you can use to formulate a CallableStatement string: the SQL92 syntax and the Oracle syntax. The SQL92 syntax is more portable (note that it makes only your JDBC calls portable the underlying stored procedures follow proprietary syntax). Since there is no cost associated with using one syntax over the other, you should use the SQL92 syntax in your production code. Let s look at the SQL92 syntax first.
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SQL92 Syntax
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For stand-alone procedures or packaged procedures, the SQL92 syntax is {call [schema.][package.]procedure_name[ ( , , .. )]} For stand-alone functions or packaged functions, the SQL92 syntax is { = call [schema.][package.]function_name[ ( , , .. )]} Note the following points: The square brackets [] denote optionality of an element (e.g., the schema in which the procedure was created is optional). The curly braces {}, on the other hand, are part of the syntax they don t denote optionality. The other elements break down as follows: schema: The schema of the owner of the stored procedure. package: The package name if the procedure is in a package. procedure_name or function_name: The name of the procedure or function. : The placeholder for the in, in out, and out parameters of the procedure, or the return value of a function. In 10g, you can also use binding by named parameters, in which case each can be replaced by the actual formal parameter name in the called procedure. When you call a procedure/function in PL/SQL, you include a semicolon ; at the end. Note, however, that there is no semicolon at the end of the SQL92 CallableStatement string. If we apply the preceding syntaxes to call the callable_demo_package s procedure and function, we get the following string for the procedure: {call callable_stmt_demo.get_emp_details_proc( , )} and the following string for the function: { = call callable_stmt_demo.get_emp_details_func( , )} Let s now look at the Oracle syntax.
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CHAPTER 6 CALLABLESTATEMENT
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Oracle Syntax
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If you are familiar with anonymous blocks, then you should be comfortable with the following Oracle syntax. For stand-alone procedures or packaged procedures, the Oracle syntax is begin [schema.][package.]procedure_name[ ( , , ... )]; end; For stand-alone functions or packaged functions, the Oracle syntax is begin := [schema.][package.]function_name[ ( , , ... )]; end; The meaning of most elements is the same as explained in the previous section for the SQL92 syntax. Note in addition that begin appears at the beginning and end; (with a semicolon) appears at the end. Also note that := is used instead of = (as in SQL92 syntax) when invoking a function. For our example procedure and function in the package callable_demo_package, the preceding syntax yields the following CallableStatement string for the procedure: "begin callable_stmt_demo.get_emp_details_proc( , ) end;", and this string for the function: "begin := callable_stmt_demo.get_emp_details_func( , ) end;", Let s move on to create a CallableStatement using these strings next.
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Creating a CallableStatement Object
We use the Connection object s prepareCall() method to create a CallableStatement object. For example, if we use the SQL92 syntax to invoke it, the creation of CallableStatement looks like CallableStatement cstmt = null; try { String sql92Style = "{ call callable_stmt_demo.get_emp_details_proc( , ) }"; . . . } Now that we have the CallableStatement object, let s look at how to bind the input parameters.
Binding Input (in or in out) Parameters
For binding input parameters for a CallableStatement, we use the appropriate setXXX() method based on the type of the parameter to be bound. Recall the signature of the procedure get_emp_details_proc: procedure get_emp_details_proc( p_empno in number, p_emp_details_cursor out sys_refcursor );
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