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C # tutorial
A stored procedure is a prepared SQL code that you can save, so the code can be reused over and over again
A stored procedure is a prepared SQL code that you can save, so the code can be reused over and over again.
So if you have an SQL query that you write over and over again, save it as a stored procedure, and then just call it to execute it.
You can also pass parameters to a stored procedure, so that the stored procedure can act based on the parameter value(s) that is passed.
Stored Procedure Syntax
CREATE PROCEDURE procedure_name
AS
sql_statement
GO;
Execute a Stored Procedure
EXEC procedure_name;
Below is a selection from the "Customers" table in the Northwind sample database:
CustomerID | CustomerName | ContactName | Address | City | PostalCode | Country |
---|---|---|---|---|---|---|
1 |
Alfreds Futterkiste | Maria Anders | Obere Str. 57 | Berlin | 12209 | Germany |
2 | Ana Trujillo Emparedados y helados | Ana Trujillo | Avda. de la Constitución 2222 | México D.F. | 05021 | Mexico |
3 | Antonio Moreno Taquería | Antonio Moreno | Mataderos 2312 | México D.F. | 05023 | Mexico |
4 |
Around the Horn | Thomas Hardy | 120 Hanover Sq. | London | WA1 1DP | UK |
5 | Berglunds snabbköp | Christina Berglund | Berguvsvägen 8 | Luleå | S-958 22 | Sweden |
The following SQL statement creates a stored procedure named "SelectAllCustomers" that selects all records from the "Customers" table:
CREATE PROCEDURE SelectAllCustomers
AS
SELECT * FROM Customers
GO;
Execute the stored procedure above as follows:
EXEC SelectAllCustomers;
The following SQL statement creates a stored procedure that selects Customers from a particular City from the "Customers" table:
CREATE PROCEDURE SelectAllCustomers
@City nvarchar(30)
AS
SELECT * FROM Customers WHERE
City = @City
GO;
Execute the stored procedure above as follows:
EXEC SelectAllCustomers @City = 'London';
Setting up multiple parameters is very easy. Just list each parameter and the data type separated by a comma as shown below.
The following SQL statement creates a stored procedure that selects Customers from a particular City with a particular PostalCode from the "Customers" table:
CREATE PROCEDURE SelectAllCustomers
@City nvarchar(30), @PostalCode nvarchar(10)
AS
SELECT * FROM Customers WHERE
City = @City AND PostalCode = @PostalCode
GO;
Execute the stored procedure above as follows:
EXEC SelectAllCustomers @City = 'London', @PostalCode = 'WA1 1DP';