T-Sql 實現類似訪問數組變量的操作

      目前T-SQL不支持Array這種類型，大多數情況我們需要用游標來實現。除了游標后我們還可以用臨時表，這里我們演示使用表變量來實現，直接看下來的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先創建一個表變量，然后插入初始數據，這些數據可能是你需要處理的數據。然后有一個設有一個標志列標記當前行有沒有執行過。你可以根據上面的代碼模板修改成為你自己的。

希望對您開發有幫助。

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作者：Petter Liu
出處：http://www.cnblogs.com/wintersun/
本文版權歸作者和博客園共有，歡迎轉載，但未經作者同意必須保留此段聲明，且在文章頁面明顯位置給出原文連接，否則保留追究法律責任的權利。
該文章也同時發布在我的獨立博客中-Petter Liu Blog。