sql - SQL Server：通过参数从 Umbraco 获取前 xx 条博客记录

Question

下面的 SQL 得到我需要的东西：

 SELECT TOP (50) [nodeId] 
 FROM [dbo].[cmsContentXml] 
 WHERE [xml] like '%creatorID="29"%'    
   AND [xml] like '%nodeType="1086"%' 
 ORDER BY [nodeId] DESC

我需要将数字作为参数传递，所以我有以下内容：

exec sp_executesql N'SELECT TOP (@max) [nodeId] FROM [dbo].[cmsContentXml] WHERE [xml] like ''%creatorID="@creatorID"%''    AND [xml] like ''%nodeType="@nodeType"%'' ORDER BY [nodeId] DESC',N'@max int,@creatorID int,@nodeType int',@max=50,@creatorID=29,@nodeType=1086

但是，它没有返回任何记录，有什么想法吗？

Answer 1

尝试修改您的 SQL 语句，以便通过在将参数作为语句的一部分发送时添加参数来构建语句，例如

'SELECT TOP ' + @max + ' [nodeId] '.....

Answer 2

问题在于您尝试使用 LIKE 子句中的参数的方式。

即@creatorID 和@nodeType 的值实际上并未在LIKE 条件中使用-您实际上是在搜索xml，其中（例如）它的字面意思类似于'%creatorID="@creatorID"'

您需要确保您的查询不会出现：

SELECT TOP (@max) [nodeId] 
FROM [dbo].[cmsContentXml] 
WHERE [xml] like '%creatorID="@creatorID"%'
    AND [xml] like '%nodeType="@nodeType"%' 
ORDER BY [nodeId] DESC

但反而：

SELECT TOP (@max) [nodeId] 
FROM [dbo].[cmsContentXml] 
WHERE [xml] like '%creatorID="' + CAST(@creatorID AS VARCHAR(50)) + '"%'
    AND [xml] like '%nodeType="' + CAST(@nodeType AS VARCHAR(50)) + '"%' 
ORDER BY [nodeId] DESC

所以像：

DECLARE @SQL NVARCHAR(1000)
SET @SQL = '
    SELECT TOP (@max) [nodeId] 
    FROM [dbo].[cmsContentXml] 
    WHERE [xml] like ''%creatorID="'' + CAST(@creatorID AS VARCHAR(50)) + ''"%''    
       AND [xml] like ''%nodeType="'' + CAST(@nodeType AS VARCHAR(50)) + ''"%'' 
    ORDER BY [nodeId] DESC'

exec sp_executesql @SQL,
    N'@max int,@creatorID int,@nodeType int',
    @max=50,@creatorID=29,@nodeType=1086