Question

SQL Server XML Schema Collection是一个有趣的概念，我发现它在设计动态数据内容时非常有用。但是，当我通过实现Schema Collections时，我发现维护它们非常困难。

架构集合DDL仅允许CREATE和ALTER / ADD节点到现有方案。

CREATE XML SCHEMA COLLECTION [ <relational_schema>. ]sql_identifier AS 'XSD Content'
ALTER XML SCHEMA COLLECTION [ <relational_schema>. ]sql_identifier ADD 'Schema Component'

如果要从架构中删除任何节点，则必须在DDL之后发出。

如果将该架构集合分配给表列，则必须更改表以从该列中删除架构集合关联
删除架构集合对象
重新创建架构集合
更改表列以将架构集合重新关联到该列。

对于集合中的100多个方案而言，这是一种痛苦。此外，您还必须重新创建XML索引（如果有的话）。

使这个架构集合对象编辑过程更容易的任何解决方案，建议和技巧？

Answer 1

我同意大卫的观点，即XML不是我们被告知的灵丹妙药，但在某些情况下，它不可避免或是工作的最佳工具。但是，架构维护很痛苦。我只有几个人要处理，但仍然会浪费时间。

此脚本可能有所帮助。它会生成表格下降并添加您需要的内容。需要进行修改以包含可能引用XML模式的UDF或其他对象。要生成添加模式语句，我建议您使用Mgt Studio的任务菜单中的“生成脚本...”功能，并将其保存为脚本的第2步。

SET NOCOUNT ON

/* 
    1) Save cols to table var
*/
DECLARE @xmlCols TABLE (
numID INTEGER IDENTITY(1,1),
TBL nvarchar(1024),
COL nvarchar(1024),
SCH nvarchar(1024)
);

insert into @xmlCols (TBL,COL,SCH)
SELECT DISTINCT OBJECT_NAME(colm.object_id) AS 'TABLE', colm.name AS 'COLUMN', coll.name AS 'Schema' 
FROM  sys.columns colm
   inner JOIN     sys.xml_schema_collections coll
        ON colm.xml_collection_id = coll.xml_collection_id
ORDER BY OBJECT_NAME(colm.object_id), colm.name   

DECLARE @lastRow as int
DECLARE @currentRow as int
DECLARE @dbName as varchar(1024)
DECLARE @tableName as varchar(1024)
DECLARE @colName as varchar(1024)
DECLARE @schemaName as varchar(1024)
SET @lastRow = @@ROWCOUNT
SET @currentRow = @lastRow
SET @dbName = 'dbNAme'

print ''
print '--!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
print '--!!!!! Scipt Schemas and Save in Mgt Studio !!!!'
print '--!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
print ''


print ''
print '--!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
print '--!!!!! Omit Schemas from COls !!!!'
print '--!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
print ''
--omit the Schema for each column
WHILE @currentRow <> 0
BEGIN
    SELECT @tableName=TBL, @colName=COL, @schemaName=SCH from @xmlCols WHERE numID = @currentRow

    print N'ALTER TABLE [' + @tableName + N'] ALTER COLUMN ['+ @colName + N'] XML'

    set @currentRow = @currentRow -1
END

print ''
print '--!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
print '--!!!!! drop your xml schema(s)  !!!!'
print '--!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
print ''
SET @currentRow = @lastRow
WHILE @currentRow <> 0
BEGIN
    SELECT @tableName=TBL, @colName=COL, @schemaName=SCH from @xmlCols WHERE numID = @currentRow

    print N'DROP XML SCHEMA COLLECTION [dbo].['+@schemaName+']'

    set @currentRow = @currentRow -1
END

print ''
print '--!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
print '--!!!!! CLean your Tables      !!!!'
print '--!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
print ''

--clean up the tables
SET @currentRow = @lastRow
WHILE @currentRow <> 0
BEGIN
    SELECT @tableName=TBL, @colName=COL, @schemaName=SCH from @xmlCols WHERE numID = @currentRow

    print N'DBCC CleanTable (''' + @dbName + N''', ''' + @tableName + N''', 0)'

    set @currentRow = @currentRow -1
END

print ''
print '--!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
print '--!!!!! Run XML Schema Scripts !!!!'
print '--!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
print ''
SET @currentRow = @lastRow
WHILE @currentRow <> 0
BEGIN
    SELECT @tableName=TBL, @colName=COL, @schemaName=SCH from @xmlCols WHERE numID = @currentRow

    print N'ALTER TABLE [' + @tableName + N'] ALTER COLUMN ['+ @colName + N'] XML('+ @schemaName + N')'''

    set @currentRow = @currentRow -1
END

希望它有所帮助。

修改SQL Server架构集合

1 个答案: