我想将返回特定用户定义数据类型的存储过程的结果转换回表。
这是基于这里提出的想法:http: //sqlblogcasts.com/blogs/danny/archive/2008/01/06/for-xml-and-back-again.aspx
因此,例如,如果我将类型声明为:
CREATE TYPE [dbo].[MyType]
AS TABLE
(
Id INT IDENTITY,
MonthNumber INT,
YearNumber INT,
NumberOfOfficersMakingReferrals INT,
TierLevel NVARCHAR(10),
TierStrengthTotal INT
)
GO
像这样调用:
DECLARE @Data [dbo].[MyType]
INSERT INTO @Data
EXEC [dbo].[sp_MyProc]
SET @Xml = (SELECT * FROM @Data FOR XML AUTO)
SELECT @Xml
-- Get a table back
EXEC uSpShredUserDefinedTableType @Xml, '[dbo].[MyType]'
GO
但是,我编写的 SP 返回 NULL,因为 XML 的 NODE 名称不会以 @UserTableType 的形式返回:
CREATE PROC dbo.uSpShredUserDefinedTableType @Xml XML, @UserTableType SYSNAME AS
DECLARE @Sql NVARCHAR(MAX)
SELECT @Sql = 'SELECT ' +
STUFF((SELECT ' ,T.Data.value(''@' +
c.name + ''', ''' +
t.name +
CASE WHEN c.user_type_id IN (165,167,173,175,231,239)
THEN '(' + CONVERT(VARCHAR, c.max_length) + ')'
WHEN c.user_type_id IN (106, 108)
THEN '(' + CONVERT(VARCHAR, c.precision)
+ ', ' + CONVERT(VARCHAR, c.scale) + ')'
ELSE '' END +
''') AS ' + c.name + CHAR(10)
FROM sys.columns c
INNER JOIN sys.types t ON c.user_type_id = t.user_type_id
WHERE object_id IN (SELECT type_table_object_id
FROM sys.table_types
WHERE name = @UserTableType)
AND t.name !='xml'
FOR XML PATH('')), 1, 7, '') +
'FROM @Xml.nodes(''/' + @UserTableType + ''') T(Data)'
EXEC sp_executesql @Sql, N'@Xml XML', @Xml = @Xml
GO
那么任何人都可以看到我在上面的存储过程中哪里出错了,以便我可以使其功能与 Danny 的示例相同,但对于用户定义的表类型?
[编辑:最终解决方案]
我不得不将 Devart 的解决方案修改为:
- 正确处理“[”,因为 SQL 正在生成错误“'['附近的语法错误,预期“节点测试”。
- 修复任何声明为 (MAX) 的生成,因为这会生成 NVARCHAR(-1)
过程:
CREATE PROC [generator].[sp_ShredUserDefinedTableType]
@AXml XML,
@AUserTableType SYSNAME
AS
DECLARE @Sql NVARCHAR(MAX)
SELECT @Sql = 'SELECT ' +
STUFF((SELECT ' ,T.Data.value(''@' +
c.name + ''', ''' +
t.name +
CASE WHEN c.user_type_id IN (165,167,173,175,231,239)
THEN '(' + CASE (c.max_length)
WHEN -1 THEN 'MAX'
ELSE
CONVERT(VARCHAR, c.max_length)
END + ')'
WHEN c.user_type_id IN (106, 108)
THEN '(' + CONVERT(VARCHAR, c.precision) + ', ' + CONVERT(VARCHAR, c.scale) + ')'
ELSE
''
END + ''') AS ' + c.name + CHAR(10)
FROM sys.table_types tt
JOIN sys.columns c ON tt.type_table_object_id = c.[object_id]
JOIN sys.types t ON c.user_type_id = t.user_type_id
WHERE SCHEMA_NAME(tt.[schema_id]) + '.' + tt.name = @AUserTableType
AND t.name != 'xml'
FOR XML PATH('')), 1, 7, '') +
'FROM @Xml.nodes(''/' + @AUserTableType + ''') T(Data)'
-- Print out the SQL that is necessary to query the XML that has been generated
PRINT @sql
GO
可以按如下方式调用:
DECLARE @Xml XML
DECLARE @Data [dbo].[t_sp_Report_AR102_DataRetrieval_V1_1_Result]
INSERT INTO @Data
EXEC [dbo].[sp_Report_AR102_DataRetrieval_V1_1]
@AOfficerParticipationNumberOfPriorDays = 30
,@AStartDate = '2013-04-01'
,@AEndDate = '2013-06-30'
,@AReferringServiceID = 4
,@AExcludePresentingIssueIDs = ''
,@AResultAsXML = @Xml OUTPUT
SET @Xml = (SELECT * FROM @Data FOR XML raw('dbo.t_sp_Report_AR102_DataRetrieval_V1_1_Result'))
EXEC [generator].[sp_ShredUserDefinedTableType] @Xml, 'dbo.t_sp_Report_AR102_DataRetrieval_V1_1_Result'