Sql-goto语句

取决于SQL—有些方言除了GOTO之外,没有为流控制提供有用的机制。

转到通常是不好的形式。

不在生产代码中,但用于测试就可以了。

例如,希望为存储过程提供回归测试,其中“公共位”是对被测试过程的调用和调试语句。

declare @test int;
set @test = 1;
goto tests

common:
print "common bit"

tests:
if @test = 1 print "1";
if @test = 2 print "2";
if @test = 3 print "3";

set @test = @test + 1;
if @test <= 3 goto common
print "finished " + cast(@test as varchar(5))
go  -- goto can not be used past go!

作为一个t-sqlnoob,我希望在范围内声明过程或函数来执行“公共位”,但这是我在google搜索了很多次之后所能想到的最好方法。为什么要为要重用的每一位代码设置一个存储过程。尤其是非生产性工作。

不。

与其他语言一样,使用Goto几乎总是有更好的选择。

如果您告诉我们您使用的是哪个SQL包,以及您要完成的任务,我们可能会告诉您哪些是合适的。

我的猜测是否定的。在任何现代语言中,我对goto语句的一般规则是,如果你使用它们,你的设计就有问题。

转到 是具有自身特征的关键字。 当需要直接跳到某个级别时,我们可以使用goto。

在我的存储过程中,我需要处理4个临时表中的数据。 在temp表中插入记录之后的每一级,我都需要检查这个temp表中是否存在记录,如果没有插入任何记录,那么我可以使用goto直接跳转而不是进一步处理。

 CREATE TABLE #tmpMsNos (custPo CHAR(24))

    CREATE TABLE #tmpValidBilltos (billto CHAR(12))

    CREATE TABLE #tmpOrders (
        fh_pkey INT
        ,fh_id CHAR(8)
        ,custPo CHAR(24)
        ,lastchOfCustInsert DATETIME
        )

    CREATE TABLE #tmpOrdersFiltered (
        fh_pkey INT
        ,fh_id CHAR(8)
        ,custPo CHAR(24)
        ,lastchOfCustInsert DATETIME
        ,onbDate DATETIME
        ,rapDate DATETIME
        )

    CREATE TABLE #tmpLoad (
        custPo CHAR(24)
        ,ld_pkey INT
        ,ld_wkpmpn CHAR(25)
        ,lda_barcode VARCHAR(30)
        ,ld_createdOn DATETIME
        ,ReceivedDate DATETIME
        ,DispatchedDate DATETIME
        )

INSERT INTO #tmpMsNos
    SELECT cast(itemValue AS CHAR(24)) 
    FROM dbo.fn_array_to_table(@pMsNos, ',')

IF (
            NOT EXISTS (
                SELECT 1
                FROM #tmpMsNos
                )
            )
    BEGIN
        GOTO label
    END
INSERT INTO #tmpValidBilltos
    SELECT CONVERT(CHAR(12), xm_doref)
    FROM xmlref x
    WHERE xm_element = 'THD-BoxtruckRequest'
        AND xm_attribute = 'THD-BoxtruckBillto'

IF (
            NOT EXISTS (
                SELECT 1
                FROM #tmpValidBilltos
                )
            )
    BEGIN
        GOTO label
    END

INSERT INTO #tmpOrders
    SELECT fh.fh_pkey
        ,fh.fh_id
        ,fh.fh_custPo
        ,max(coc.ch_dt)
    FROM #tmpMsNos msNos
    INNER JOIN fcfgthd fh ON msNos.custPo = fh.fh_custPo
    INNER JOIN #tmpValidBilltos bt ON bt.billto = fh.fh_bt_id
    LEFT JOIN chofcust coc ON coc.ch_fhpkey = fh.fh_pkey
    WHERE fh.fh_statcode NOT IN (
            98 --CAN
            ,99 --DEL
            )
        AND fh.fh_ship_dt > @startDate
    GROUP BY fh.fh_pkey
        ,fh.fh_id
        ,fh.fh_custPo

    IF (
            NOT EXISTS (
                SELECT 1
                FROM #tmpOrders
                )
            )
    BEGIN
        GOTO label
    END

INSERT INTO #tmpOrdersFiltered
    SELECT t.fh_pkey
        ,t.fh_id
        ,t.custPo
        ,t.lastchOfCustInsert
        ,MAX(cocONB.ch_dt)
        ,MAX(cocRAP.ch_dt)
    FROM (
        SELECT tmpO.fh_pkey
            ,tmpo.fh_id
            ,tmpO.custPo
            ,tmpO.lastchOfCustInsert
        FROM #tmpOrders tmpO
        INNER JOIN (
            SELECT custpo
                ,max(lastchOfCustInsert) AS MaxInserteddate
            FROM #tmpOrders
            GROUP BY custpo
            ) tmpOgrouped ON tmpO.custpo = tmpOgrouped.custpo
            AND tmpO.lastchOfCustInsert = tmpOgrouped.MaxInserteddate
        ) AS t
    LEFT JOIN chofcust cocRAP ON cocRAP.ch_fhpkey = t.fh_pkey
        AND cocRAP.ch_stat = 2 -- RAP --TODO: Add comment with status code like 98, 99 -- CAN, DEL for readability - Paresh
    LEFT JOIN chofcust cocONB ON cocONB.ch_fhpkey = t.fh_pkey
        AND cocONB.ch_stat = 5 -- ONB --TODO: Add comment with status code like 98, 99 -- CAN, DEL for readability - Paresh
    GROUP BY t.fh_pkey
        ,t.fh_id
        ,t.custPo
        ,t.lastchOfCustInsert

    --TODO: Take an exit if no order found into #tmpOrdersFiltered table, while taking a early exit make sure it doesn't break the calling code (C#)  - Paresh
    IF (
            NOT EXISTS (
                SELECT 1
                FROM #tmpOrdersFiltered
                )
            )
    BEGIN
        GOTO label
    END
INSERT INTO #tmpLoad
    SELECT o.custPo
        ,l.ld_pkey
        ,l.ld_wkpmpn
        ,la.lda_barcode
        ,max(coc.ch_dt)
        ,CASE ISNULL(w.xl_date, '')
            WHEN ''
                THEN o.rapDate
            ELSE w.xl_date
            END AS ReceivedDate
        ,CASE ISNULL(mm.me_ecpkey, '')
            WHEN ''
                THEN o.ONBDate
            ELSE NULL
            END AS DispatchedDate
    FROM #tmpOrdersFiltered o
    INNER JOIN fcload l ON l.ld_fhpkey = o.fh_pkey
    LEFT JOIN loadanc la ON la.lda_ldpkey = l.ld_pkey
    LEFT JOIN wkxaclog w ON w.xl_ldpkey = l.ld_pkey
    LEFT JOIN multiexceps mm ON mm.me_ldpkey = l.ld_pkey
        AND mm.me_ecpkey = @missingitemexcep
    LEFT JOIN chofcust COC ON coc.ch_ldpkey = l.ld_pkey
        AND coc.ch_stat = 64 -- 64= ILH
    GROUP BY o.custPo
        ,l.ld_pkey
        ,l.ld_wkpmpn
        ,la.lda_barcode
        ,w.xl_date
        ,o.rapDate
        ,mm.me_ecpkey
        ,o.ONBDate