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  • SQLServer 存储过程中不拼接SQL字符串实现多条件查询

    以前拼接的写法 

    set @sql=' select * from table where 1=1 '

    if (@addDate is not null)

    set @sql = @sql+' and addDate = '+ @addDate + ''
    if (@name <>'' and is not null)
    set @sql = @sql+ ' and name = ' + @name + ' '
    exec(@sql)

    下面是 不采用拼接SQL字符串实现多条件查询的解决方案

    第一种写法是 感觉代码有些冗余
    if (@addDate is not null) and (@name <> '')
    select * from table where addDate = @addDate and name = @name
    else if (@addDate is not null) and (@name ='')
    select * from table where addDate = @addDate
    else if(@addDate is null) and (@name <> '')
    select * from table where and name = @name
    else if(@addDate is null) and (@name = '')
    select * from table

    第二种写法是

    select * from table where (addDate = @addDate or @addDate is null) and (name = @name or @name = '')
    第三种写法是

    SELECT * FROM table where
    addDate = CASE @addDate IS NULL THEN addDate ELSE @addDate END,
    name = CASE @name WHEN '' THEN name ELSE @name END
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  • 原文地址:https://www.cnblogs.com/leonkin/p/2363795.html
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