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我们创建了一个存储过程，以便用户可以在其软件产品的管理员中编写逗号分隔的搜索标签。所以他可以添加逗号分隔的标签，如果他想编辑它们，我们从表中读取所有标签，在存储过程中将它们重新创建为逗号分隔值 (CSV) 并将其返回给调用代码。最近发生的事情，用户抱怨他看不到他写的新 CSV。我调查了一下，发现存储过程在从数据库中读取值并创建 CSV 字符串时截断了字符串。该字符串的类型为 nvarchar，并且由于其超过了 4000 个限制的最大字符数，因此这些值会被截断。关于如何解决这个问题的任何想法。

在下面找到我的代码。

BEGIN
BEGIN 
    Declare @Synonyms Table
    (
        RowID int Identity(1,1),
        SynonymID int,
        [Synonym] nvarchar(4000)
    );

    SET NOCOUNT ON;

    Insert @Synonyms(SynonymID, [Synonym])
    Select distinct SynonymID, [Synonym] From RF_SearchSynonyms with(nolock) Where SearchTermID = @SearchTermID And ActiveInd = 1

    If((Select COUNT(RowID) From @Synonyms) <> 0)
    BEGIN
        Declare @CurrentRow int = (Select MIN(RowID) From @Synonyms),
                @TotalRows int = (Select MAX(RowID) From @Synonyms),
                @Synonyms_CSV nvarchar(4000) = '';


        WHILE @CurrentRow <= @TotalRows
        BEGIN
            Declare @TempSyn nvarchar(500);
            Select @TempSyn = [Synonym] + ',' From @Synonyms Where RowID = @CurrentRow;
            Set @Synonyms_CSV = @Synonyms_CSV + LTRIM(RTRIM(LOWER(@TempSyn)));

            SET @CurrentRow = @CurrentRow + 1
        END
    END
    Else
    BEGIN
        Set @Synonyms_CSV = '';
    END
END

BEGIN
    Declare @SKUs Table
    (
        RowID int Identity(1,1),
        SkuID int,
        SKU nvarchar(15)
    );

    SET NOCOUNT ON;

    Insert @SKUs(SkuID, SKU)
    Select distinct SkuID, SKU From RF_SearchSkus with(nolock) Where SearchTermID = @SearchTermID And ActiveInd = 1

    If((Select COUNT(RowID) From @SKUs) <> 0)
    BEGIN
        Declare @CurrentRow1 int = (Select MIN(RowID) From @SKUs),
                @TotalRows1 int = (Select MAX(RowID) From @SKUs),
                @Skus_CSV nvarchar(4000) = '';


        WHILE @CurrentRow1 <= @TotalRows1
        BEGIN
            Declare @TempSku nvarchar(15);
            Select @TempSku = SKU + ',' From @SKUs Where RowID = @CurrentRow1;
            Set @Skus_CSV = @Skus_CSV + LTRIM(RTRIM(@TempSku));

            SET @CurrentRow1 = @CurrentRow1 + 1
        END
    END
    Else
    BEGIN
        Set @Skus_CSV = '';
    END
END

BEGIN
    Declare @Combined varchar(8000),
            @syn_len int = 0,
            @sku_len int = 0;

    Select @syn_len = LEN(@Synonyms_CSV);
    Select @sku_len = LEN(@Skus_CSV);
    Select @Combined = @Synonyms_CSV + '-_-' + @Skus_CSV;

    Select @Synonyms_CSV + '-_-' + @Skus_CSV;
END

结尾

I can't use text and ntext as they do not play nice with concatenation operations.

Thanks.

4

1 回答 1

3

How are your declaring the string parameter?

nvarchar(max)

supports up to 2^32-1 (2GB)

See this link.

于 2010-12-20T22:27:54.307 回答