Altering Stored Procedures in Visual Studio .NET

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Altering Stored Procedures
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The other way to change a stored procedure is to use the Alter Procedure statement:
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Alter Procedure prGetEquipment @intEqTypeId int as Select * from Equipment where EqTypeId = @intEqTypeId go
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3: Stored Procedure Design Concepts
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The syntax of this statement is identical to the syntax of the Create Procedure statement (except for the keyword). The main reason for using this statement is to avoid undesirable effects on permissions and dependent database objects. For more details about permissions, see 10. The Alter Procedure statement preserves all aspects of the original stored procedure. The object identification number (id column) of the procedure from the sysobjects table remains the same, and all references to the stored procedure are intact. Therefore, it is much better to use the Alter Procedure statement than to drop and re-create the procedure. For more details about the sysobjects table and the object identification number (id column), see Storing Stored Procedures, later in this chapter.
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When you are creating or changing a stored procedure, you should keep in mind the following limits: The name of the procedure is a standard Transact-SQL identifier. The maximum length of any identifier is 128 characters. Stored procedures may contain up to 2100 input and output parameters. The body of the stored procedure consists of one or more Transact-SQL statements. The maximum size of the body of the stored procedure is 128MB.
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Stored procedures can be used to Return information to the caller Modify data in databases Implement business logic in data tier Control access to data Improve performance of the system Reduce network traffic Perform other actions and operations (such as process e-mail, execute operating system commands and processes, and manage other SQL server objects) There are four ways to receive information from a stored procedure: Result set Output parameters
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SQL Server 2000 Stored Procedure & XML Programming
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Return value Global cursor
Returning Result Sets
To obtain a result set from a stored procedure, insert a Transact-SQL statement that returns a result set into the body of the stored procedure. The simplest way is by using a Select statement, but you could also call another stored procedure. It is also possible to return several result sets from one stored procedure. Such a stored procedure will simply contain several Select statements. You should note that some client data-access methods (such as ADO) can access all result sets, but others will receive just the first one or possibly even report an error.
Input and Output Parameters
Let s add a new procedure to the Asset database:
Create procedure prGetEqId @chvMake varchar(50), @chvModel varchar(50) as select EquipmentId from Equipment where Make = @chvMake and Model = @chvModel
This is a very simple stored procedure. It uses two input parameters to receive the make and model, and returns identifiers of equipment that matches the specified make and model. Physically, the stored procedure encapsulates just one Select statement. The header and body of the procedure are divided by the keyword As. The header of the stored procedure contains a list of parameters delimited with a comma (,) character. Each parameter is defined with an identifier and a data type. Parameter identifiers must begin with the at sign (@). You can use the following statement to execute the stored procedure:
Execute prGetEqId 'Toshiba', 'Portege 7020CT'
The keyword Execute is followed by the name of the stored procedure. Since the stored procedure requires two parameters, they are provided in the form of a comma-delimited list. In this case, they are strings, so they must be delimited with single quotation marks.
3: Stored Procedure Design Concepts
The keyword Execute is not needed if the stored procedure is executed in the first statement of a batch:
prGetEqId 'Toshiba', 'Portege 7020CT'
However, I recommend you use it. It is a good habit that leads to clean code. You can use its shorter version (Exec) to save keystrokes:
Exec prGetEqId 'Toshiba', 'Portege 7020CT'
The execution will return a result set containing just one value in one record:
EquipmentId ----------1 (1 row(s) affected)
Stored procedures can return output parameters to the caller. To illustrate, we will create a stored procedure similar to the previous one, but having one critical difference: this new stored procedure contains an additional parameter. The direction of the parameter is controlled by including the keyword Output after the data type:
Create procedure prGetEqId_2 @chvMake varchar(50), @chvModel varchar(50), @intEqId int output as select @intEqId = EquipmentId from Equipment where Make = @chvMake and Model = @chvModel
The Select statement does not return a result set, as the previous one did. Instead, it assigns an output parameter, @EqId, with the selected value.
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