分頁查詢沒有任何返回

Question

我的查詢是這樣的，但它不會返回任何內容 @ value0，@ value1，@ value2，@ value3，@ field0 changable字段，它們可能爲空值或值取決於來自窗體的參數。 例如當我把這些值，它什麼也沒有返回
@page = 1，@ size = 20，@ sort = N'Id'，@ ts = N'DESC'，@ field0 = N'Name'，@ value2 = N'2000-1-1'，@ value3 = null，@ value1 = null，@ value0 = null 我做錯了什麼？

  @page INT, 
      @size INT,@sort nvarchar(50) , 
      @ts nvarchar(50) , 
      @totalrow INT OUTPUT, 
      @value0 nvarchar(50), 
      @value1 nvarchar(50), 
      @value2 nvarchar(50), 
      @value3 nvarchar(50), 
      @field0 nvarchar(50) 

       AS 
       BEGIN 
        DECLARE @offset INT 
        DECLARE @newsize INT 
        DECLARE @sql NVARCHAR(MAX) 


        IF(@page=0) 
       begin 
       SET @offset = @page; 
       SET @newsize = @size 
       end 
        ELSE 
       begin 
       SET @offset = @page+1; 
       SET @newsize = @size-1 
       end 

        SET NOCOUNT ON; 
       SET @sql = ' 
        WITH OrderedSet AS 
        (
      SELECT Ks.Id,c.Name,c.CId,Ks.RegisterDate,ROW_NUMBER() 
    OVER (ORDER BY ' + @sort + ' '+@ts+') AS ''Index'' 
      FROM Ks LEFT OUTER JOIN Car c On c.CId=Ks.CId WHERE 
      AND (Ks.RegisterDate >'''+@value2+''' OR '''+@value2+''' IS NULL) 
      AND (Ks.RegisterDate <'''+@value3+''' OR '''+@value3+''' IS NULL) 
     AND (Ks.RegisterDate ='''+@value1+''' OR '''+@value1+''' IS NULL) 
      AND ('+@field0+' LIKE ''%'+@value0+'%'' OR @value0 IS NULL) 
     ) 
     SELECT * FROM OrderedSet WHERE [Index] BETWEEN ' + 
CONVERT(NVARCHAR(12), @offset) + ' AND ' + CONVERT(NVARCHAR(12), (@offset + @newsize)) 

        EXECUTE (@sql) 

        SET @totalrow = (SELECT COUNT(*) FROM [dbo].[Ks]) 
        print @sql 

Answer 1

當您連接一個null爲一個字符串，其結果是null。

我在SQL syntax中看到了太多的錯誤，我正在猜測這個更正。例如，如果@value(n) is not null其他2 @value(n)之一必須是NULL

我強烈建議你看看@sql值，然後再糾正錯誤。

建議的方式來解決這個null參數的值可以是：

@page INT, 
      @size INT,@sort nvarchar(50) , 
      @ts nvarchar(50) , 
      @totalrow INT OUTPUT, 
      @value0 nvarchar(50), 
      @value1 nvarchar(50), 
      @value2 nvarchar(50), 
      @value3 nvarchar(50), 
      @field0 nvarchar(50) 

       AS 
       BEGIN 
        DECLARE @offset INT 
        DECLARE @newsize INT 
        DECLARE @sql NVARCHAR(MAX) 


        IF(@page=0) 
       begin 
       SET @offset = @page; 
       SET @newsize = @size 
       end 
        ELSE 
       begin 
       SET @offset = @page+1; 
       SET @newsize = @size-1 
       end 

       DECLARE @Ks_RegisterDate_Condition NVARCHAR(1000) 

       IF (@value1 IS NULL AND @value2 IS NULL AND @value3 IS NULL) 
       BEGIN 
        SET @Ks_RegisterDate_Condition = N'KsRegisterDate IS NULL' 
       END 
       ELSE 
       BEGIN 
        IF (@value1 IS NOT NULL) 
        BEGIN 
         SET @Ks_RegisterDate_Condition = N'(Ks.RegisterDate ='''+@value1+'''' 
        END 
        IF (@value2 IS NOT NULL) 
        BEGIN 
         SET @Ks_RegisterDate_Condition = N'(Ks.RegisterDate >'''+@value2+'''' 
        END 
        IF (@value3 IS NOT NULL) 
        BEGIN 
         SET @Ks_RegisterDate_Condition = N'(Ks.RegisterDate >'''+@value3+'''' 
        END 
       END 

       IF (NOT (@field0 IS NULL OR @value0 IS NULL)) 
       BEGIN 
        SET @Ks_RegisterDate_Condition += + N'AND ' + @field0+N' LIKE ''%'+@value0+N'%''' 
       END 

        SET NOCOUNT ON; 
       SET @sql = ' 
        WITH OrderedSet AS 
        (
      SELECT Ks.Id,c.Name,c.CId,Ks.RegisterDate,ROW_NUMBER() 
    OVER (ORDER BY ' + @sort + ' '+@ts+') AS ''Index'' 
      FROM Ks LEFT OUTER JOIN Car c On c.CId=Ks.CId WHERE ' + 
      @Ks_RegisterDate_Condition + ' 
     ) 
     SELECT * FROM OrderedSet WHERE [Index] BETWEEN ' + 
CONVERT(NVARCHAR(12), @offset) + ' AND ' + CONVERT(NVARCHAR(12), (@offset + @newsize)) 

        print @sql 
        EXECUTE (@sql) 

        SET @totalrow = (SELECT COUNT(*) FROM [dbo].[Ks])