RETURN (Transact-SQL)

Exits unconditionally from a query or procedure. RETURN is immediate and complete and can be used at any point to exit from a procedure, batch, or statement block. Statements that follow RETURN are not executed.

Transact-SQL Syntax Conventions

Składnia

RETURN [ integer_expression ] 

Arguments

• integer_expression
  Is the integer value that is returned. Stored procedures can return an integer value to a calling procedure or an application.

Return Types

Optionally returns int.

[!UWAGA]

Unless documented otherwise, all system stored procedures return a value of 0. This indicates success and a nonzero value indicates failure.

Uwagi

When used with a stored procedure, RETURN cannot return a null value. If a procedure tries to return a null value (for example, using RETURN @status when @status is NULL), a warning message is generated and a value of 0 is returned.

The return status value can be included in subsequent Transact-SQL statements in the batch or procedure that executed the current procedure, but it must be entered in the following form: EXECUTE @return\_status = <procedure_name>.

Examples

A. Returning from a procedure

The following example shows if no user name is specified as a parameter when findjobs is executed, RETURN causes the procedure to exit after a message has been sent to the user's screen. If a user name is specified, the names of all objects created by this user in the current database are retrieved from the appropriate system tables.

CREATE PROCEDURE findjobs @nm sysname = NULL
AS 
IF @nm IS NULL
    BEGIN
        PRINT 'You must give a user name'
        RETURN
    END
ELSE
    BEGIN
        SELECT o.name, o.id, o.uid
        FROM sysobjects o INNER JOIN master..syslogins l
            ON o.uid = l.sid
        WHERE l.name = @nm
    END;

B. Returning status codes

The following example checks the state for the ID of a specified contact. If the state is Washington (WA), a status of 1 is returned. Otherwise, 2 is returned for any other condition (a value other than WA for StateProvince or ContactID that did not match a row).

USE AdventureWorks2012;
GO
CREATE PROCEDURE checkstate @param varchar(11)
AS
IF (SELECT StateProvince FROM Person.vAdditionalContactInfo WHERE ContactID = @param) = 'WA'
    RETURN 1
ELSE
    RETURN 2;
GO

The following examples show the return status from executing checkstate. The first shows a contact in Washington; the second, contact not in Washington; and the third, a contact that is not valid. The @return\_status local variable must be declared before it can be used.

DECLARE @return_status int;
EXEC @return_status = checkstate '2';
SELECT 'Return Status' = @return_status;
GO

Here is the result set.

Return Status

-------------

1

Execute the query again, specifying a different contact number.

DECLARE @return_status int;
EXEC @return_status = checkstate '6';
SELECT 'Return Status' = @return_status;
GO

Here is the result set.

Return Status

-------------

2

Execute the query again, specifying another contact number.

DECLARE @return_status int
EXEC @return_status = checkstate '12345678901';
SELECT 'Return Status' = @return_status;
GO

Here is the result set.

Return Status

-------------

2

Zobacz także

Odwołanie

ALTER PROCEDURE (Transact-SQL)

CREATE PROCEDURE (Transact-SQL)

DECLARE @local\_variable (Transact-SQL)

EXECUTE (Transact-SQL)

SET @local\_variable (Transact-SQL)