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GO -- ============================================= -- Example to execute the stored procedure -- ============================================= DECLARE <@variable_for_output_parameter, sysname, @p2_output> <datatype_for_output_parameter, , int> EXECUTE <Schema_Name, sysname, Schema_Name>. <Procedure_Name, sysname, Procedure_Name> <value_for_param1, , 1>, <@variable_for_output_parameter, sysname, @p2_output> OUTPUT SELECT <@variable_for_output_parameter, sysname, @p2_output> GO 3. Now that we have seen the code, it is time to update the template parameters. Again, we find that the template is not ideal for our final solution, as we only have one input parameter and two output parameters. However, we have populated the template parameters we need. This stored procedure will belong to the CustomerDetails schema. We have one integer input parameter for the customer ID, followed by the first of our output parameters for cleared balances. Once you have entered these settings, as shown in Figure 10-6, click OK.
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Figure 10-6. Template values for the OUTPUT stored procedure 4. Let s look at the code that was generated. The first section of code checks whether the stored procedure exists. If it does, then we delete it using the DROP PROCEDURE statement. -- =============================================== -- Create stored procedure with OUTPUT parameters -- =============================================== -- Drop stored procedure if it already exists IF EXISTS ( SELECT * FROM INFORMATION_SCHEMA.ROUTINES WHERE SPECIFIC_SCHEMA = N'CustomerDetails' AND SPECIFIC_NAME = N'apf_CustBalances' ) DROP PROCEDURE CustomerDetails.apf_CustBalances GO
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CHAPTER 10 S TORED PROCEDURES AN D FUNC TIONS
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5. Move on to the second section, which creates the contents of the stored procedure; we ll go through each part of it in turn. This stored procedure takes three parameters: an input parameter of @CustId, and two output parameters that will be passed back to either another stored procedure or a program, perhaps written in C#, etc. Don t worry, it is possible to use Query Editor to see the value of the output parameter. When defining parameters in a stored procedure, there is no need to specify that a parameter is set for input, as this is the default; however, if we do need to define a parameter as an output parameter, we have to insert OUTPUT as a suffix to each parameter.
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Tip
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If we define an OUTPUT parameter but do not define a value within the stored procedure, it will have a value of NULL.
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CREATE PROCEDURE CustomerDetails.apf_CustBalances @CustId int, @ClearedBalance money OUTPUT, @UnclearedBalance money OUTPUT AS 6. Take a look at the next section of code, which is very similar to what we have covered several times earlier in the book where we are assigning values to variables: SELECT @ClearedBalance = ClearedBalance, @UnclearedBalance = UnclearedBalance FROM Customers WHERE CustomerId = @CustId 7. The final section of the stored procedure returns a value from a system global variable, @@ERROR. We ll look at this variable in the next chapter, but in essence, this variable returns a number if an error occurred. From this, the calling code can tell whether there have been problems and can then decide whether to ignore any values in the OUTPUT parameter. RETURN @@Error GO 8. This completes the stored procedure definition. The template continues defining how to execute the stored procedure. The first part of this section defines the variables that hold the output values and the return value. We do not need to define a variable for the input value, although you could if it was required. Then we move to the EXECUTE section of code. When a value is returned from a stored procedure, it is set on the left-hand side of the stored procedure call and is not a parameter value. Then the stored procedure is defined with the three parameters. Note that each output parameter has to have the OUTPUT keyword after it. The final section of the code is a SELECT statement displaying the values returned and the output parameter. -- ============================================= -- Example to execute the stored procedure -- ============================================= DECLARE @ClearedBalance Money, @UnclearedBalance Money DECLARE @RetVal int EXECUTE @RetVal=CustomerDetails.apf_CustBalances 1, @ClearedBalance OUTPUT, @UnclearedBalance OUTPUT SELECT @RetVal AS ReturnValue, @ClearedBalance AS ClearedBalance, @UnclearedBalance AS UnclearedBalance GO
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