T-Sql 实现类似访问数组变量的操作

      目前T-SQL不支持Array这种类型，大多数情况我们需要用游标来实现。除了游标后我们还可以用临时表，这里我们演示使用表变量来实现，直接看下来的T-SQL：

 

--Then "iterate" through it executing the necessary SQL from those values.

--This will allow you to have 0 to MANY values to be executed, so you don't have to set up a variable for each.

--The following is a complete sample of how you may go about doing that without cursors.

SET NOCOUNT ON

DECLARE @dict TABLE (

                    id          INT IDENTITY(1,1), -- a unique identity column for reference later

                    value       VARCHAR(50),       -- your parameter value to be passed into the procedure

                    executed    BIT                -- BIT to mark a record as being executed later

                    )

-- INSERT YOUR VALUES INTO @dict HERE

-- Set executed to 0 (so that the executio    n process will pick it up later)

-- This may be a SELECT statement into another table in your database to load the values into @dict

INSERT @dict

SELECT '390adbc5-3494-4651-95af-608b69a304c1',0  UNION ALL

SELECT 'ddf23828-fbf9-4d16-81fa-3f4b465539a3',0     UNION ALL

SELECT '02627340-22cd-4758-807d-6251acd5a0e5',0    

DECLARE @currentid INT

DECLARE @currentvalue VARCHAR(50)

WHILE EXISTS(SELECT * FROM @dict WHERE executed = 0)

BEGIN

    -- Get the next record to execute

    SELECT 

    TOP 1   @currentid = id 

    FROM    @dict 

    WHERE   executed = 0

    -- Get the parameter value

    SELECT  @currentvalue = value

    FROM    @dict

    WHERE   id = @currentid

    -- EXECUTE THE SQL HERE 

    ---BEGIN

    PRINT   'SecondSP ' +  '@myParam int ' + '@myParam = ' + @currentvalue

    -- END

    -- Mark record as having been executed

    UPDATE  d

    SET     executed = 1

    FROM    @dict d

    WHERE   id = @currentid

END

 

上面的T-SQL先创建一个表变量，然后插入初始数据，这些数据可能是你需要处理的数据。然后有一个设有一个标志列标记当前行有没有执行过。你可以根据上面的代码模板修改成为你自己的。

希望对您开发有帮助。

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作者：Petter Liu
出处：http://www.cnblogs.com/wintersun/
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该文章也同时发布在我的独立博客中-Petter Liu Blog。