Connecting to Your Database
Using Embedded SQL with ODBC

PowerBuilder requires a declarative statement to identify the database stored procedure that is being used and to specify a logical name for the procedure. The logical name is used to reference the procedure in subsequent SQL statements.

The general syntax for declaring a procedure is:

DECLARE logical_procedure_name PROCEDURE FOR 
   procedure_name 
   @param1 = value, @param2 = value2, 
   @PARAM3 = VALUE3 OUTPUT 
{USING transaction_object};

where logical_procedure_name can be any valid PowerScript identifier and procedure_name is the name of a stored procedure in the database. Use the OUT or OUTPUT keyword to obtain the value of the output parameter.

The parameter references can take the form of any valid parameter string the database accepts. PowerBuilder inspects the parameter list format only for variable substitution. The USING clause is required only if you are using a transaction object other than the default transaction object (SQLCA).

You must set the PBNewSPInvocation database parameter to "Yes" to use this method to invoke a stored procedure. The behavior of the PowerBuilder ODBC driver when this DBParm is set is consistent with the default behavior of the OLE DB drivers.

If PBNewSPInvocation is set to "Yes", this method is used when you retrieve data into a DataWindow object that uses a stored procedure. This DBParm has no effect when you use RPC to invoke a stored procedure.

If PBNewSPInvocation is set to "No", use the syntax described in ODBC DECLARE and EXECUTE.

Example 1

Assume a stored procedure named proc1 is defined on the server as:

CREATE PROCEDURE proc1 AS
   SELECT emp_name FROM employee

To declare proc1 for processing within PowerBuilder, enter:

DECLARE emp_proc PROCEDURE FOR proc1;

The procedure declaration is a nonexecutable statement, just like a cursor declaration. However, where cursors have an OPEN statement, procedures have an EXECUTE statement.

When an EXECUTE statement executes, the procedure is invoked. The EXECUTE refers to the logical procedure name, in this example emp_proc:

EXECUTE emp_proc;

Example 2

To declare a procedure with input and output parameters, enter:

DECLARE sp_duration PROCEDURE FOR pr_date_diff_prd_ken
   @var_date_1 = :ad_start,
   @var_date_2 = :ad_end,
   @rtn_diff_prd = :ls_duration OUTPUT;

If the stored procedure contains result sets, you must fetch the result sets first. If the stored procedure has a return value and you want to obtain it, use the format RC=procedure_name:

DECLARE sp_duration PROCEDURE FORRC=pr_date_diff_prd_ken 
   @var_date_1 = :ad_start,
   @var_date_2 = :ad_end,
   @rtn_diff_prd = :ls_duration OUTPUT;