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我需要半自动化扩展属性更新，无论对错，我计划做的是用所有数据填充临时表，然后在检查值是否已经存在时以某种方式加入临时表。然后我想遍历临时表中的每一行，如果值存在，调用函数sp_updateextendedproperty，如果不调用函数sp_addextendedproperty。以下是我的出发点，什么会使这项工作？

DECLARE @Table TABLE (id int IDENTITY(1,1),TableName SYSNAME, ColumnName varchar(200), ColumnDescription varchar(200))

INSERT INTO @Table VALUES('MyTable', 'Col1', 'Col1 description')
INSERT INTO @Table VALUES('MyTable', 'Col2', 'Col2 description')

IF EXISTS 
(select 
    sc.name,
    sep.value
from sys.tables st
inner join sys.columns sc on st.object_id = sc.object_id
left join sys.extended_properties sep on st.object_id = sep.major_id
                                 and sc.column_id = sep.minor_id
                                 and sep.name = 'MS_Description'
where st.name = @Table.TableName and sc.name = @Table.ColumnName and sep.value is not null)

EXEC sp_updateextendedproperty 
@name = N'MS_Description', @value = @Table.ColumnDescription,
@level0type = N'Schema', @level0name = 'dbo', 
@level1type = N'Table',  @level1name = @Table.TableName, 
@level2type = N'Column', @level2name = @Table.ColumnName

ELSE

EXEC sp_addextendedproperty 
@name = N'MS_Description', @value = @Table.ColumnDescription,
@level0type = N'Schema', @level0name = 'dbo',
@level1type = N'Table', @level1name = @Table.TableName, 
@level2type = N'Column', @level2name = @Table.ColumnName

新脚本

CREATE TABLE updateTable (TableName SYSNAME, ColumnName varchar(100), ColumnDescription varchar(100))

INSERT INTO updateTable VALUES('tblHAEMATOLOGY_MDT', 'MDT_ID', 'row1 test run')
INSERT INTO updateTable VALUES('tblHAEMATOLOGY_MDT', 'MEETING_ID', 'row2 test run')

DECLARE @TableName SYSNAME, @ColumnName varchar(100), @ColumnDescription varchar(100)
DECLARE @UpdateCursor CURSOR

SET @UpdateCursor = CURSOR FOR
SELECT TableName, ColumnName, ColumnDescription FROM updateTable

OPEN @UpdateCursor

FETCH NEXT FROM @UpdateCursor INTO @TableName, @ColumnName, @ColumnDescription

WHILE @@FETCH_STATUS = 0
BEGIN

IF EXISTS 
(select 
    sc.name,
    sep.value
from sys.tables st
inner join sys.columns sc on st.object_id = sc.object_id
left join sys.extended_properties sep on st.object_id = sep.major_id
                                 and sc.column_id = sep.minor_id
                                 and sep.name = 'MS_Description'
left join updateTable on st.name = @TableName and sc.name = @ColumnName
where sep.value is not null)

BEGIN

EXEC sp_updateextendedproperty 
@name = N'MS_Description', @value = @ColumnDescription,
@level0type = N'Schema', @level0name = 'dbo', 
@level1type = N'Table',  @level1name = @TableName, 
@level2type = N'Column', @level2name = @ColumnName

FETCH NEXT FROM @UpdateCursor INTO @TableName, @ColumnName, @ColumnDescription

END

ELSE

BEGIN

EXEC sp_addextendedproperty 
    @name = N'MS_Description', @value = @ColumnDescription,
    @level0type = N'Schema', @level0name = 'dbo',
    @level1type = N'Table', @level1name = @TableName, 
    @level2type = N'Column', @level2name = @ColumnName

FETCH NEXT FROM @UpdateCursor INTO @TableName, @ColumnName, @ColumnDescription

END

END

CLOSE @UpdateCursor
DEALLOCATE @UpdateCursor
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1 回答 1

1

这是我要说的极少数情况之一，但解决方案是使用游标。只需针对您的表变量创建一个游标循环并在循环内运行您的存在查询。我以前做过这个完全相同的逻辑，它应该可以正常工作。

于 2016-03-18T16:42:27.870 回答