SQL2005系统升级手记之四-自动生成数据字典与系统表Sys.extended_properites
在SQL Server 2000 中,好多人都喜欢在表和列的扩展属性里面添加说明,然后用脚本生成数据库字典,升级到SQL Server 2005 后,会发现SQL Server 2000上的脚本不能使用了,其中绝大多数都是因为SQL Server 2005已经废弃了系统表sysproperties。
注意,sysproperties因为是无正式文档记载的系统表,已经在Sql2005中废弃了,Sql2005中使用Sys.extended_properites保存用户自定义的表、字段的属性信息。
原先的脚本:
改为
注意,sysproperties因为是无正式文档记载的系统表,已经在Sql2005中废弃了,Sql2005中使用Sys.extended_properites保存用户自定义的表、字段的属性信息。
原先的脚本:
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SELECT
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(case when a.colorder=1 then d.name else '' end)表名,
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a.colorder 字段序号,
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a.name 字段名,
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(case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) 标识,
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(case when (SELECT count(*)
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FROM sysobjects
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WHERE (name in
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(SELECT name
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FROM sysindexes
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WHERE (id = a.id) AND (indid in
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(SELECT indid
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FROM sysindexkeys
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WHERE (id = a.id) AND (colid in
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(SELECT olid
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FROM yscolumns
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WHERE (id = a.id) AND (name = a.name))))))) AND
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(xtype = 'PK'))>0 then '√' else '' end) 主键,
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b.name 类型,
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a.length 占用字节数,
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COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度,
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isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数,
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(case when a.isnullable=1 then '√'else '' end) 允许空,
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isnull(e.text,'') 默认值,
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isnull(g.[value],'') AS 字段说明
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FROM syscolumns a left join systypes b
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on a.xtype=b.xusertype
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inner join sysobjects d
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on a.id=d.id and d.xtype='U' and .name<>'dtproperties'
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left join syscomments e
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on a.cdefault=e.id
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left join sysproperties g
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on a.id=g.id AND a.colid = g.smallid
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order by a.id,a.colorder

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改为
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SELECT
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(case when a.colorder=1 then d.name else '' end)表名,
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a.colorder 字段序号,
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a.name 字段名,
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(case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) 标识,
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(case when (SELECT count(*)
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FROM sysobjects
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WHERE (name in
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(SELECT name
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FROM sysindexes
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WHERE (id = a.id) AND (indid in
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(SELECT indid
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FROM sysindexkeys
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WHERE (id = a.id) AND (colid in
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(SELECT colid
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FROM syscolumns
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WHERE (id = a.id) AND (name = a.name))))))) AND
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(xtype = 'PK'))>0 then '√' else '' end) 主键,
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b.name 类型,
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a.length 占用字节数,
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COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度,
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isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数,
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(case when a.isnullable=1 then '√'else '' end) 允许空,
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isnull(e.text,'') 默认值,
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isnull(g.[value],'') AS 字段说明
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FROM syscolumns a left join systypes b
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on a.xtype=b.xusertype
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inner join sysobjects d
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on a.id=d.id and d.xtype='U' and d.name<>'dtproperties'
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left join syscomments e
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on a.cdefault=e.id
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left join sys.extended_properties g
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on a.id=g.major_id AND a.colid = g.major_id
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order by a.id,a.colorder
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