SQL提取数据库表名及字段名等信息代码示例

2017-10-26 19:57:47来源:作者:人点击

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本文向大家介绍了使用SQL语句提取数据库所有表的表名、字段名的实例代码,在SQLserver 中进行了测试,具体内容如下:

--查询所有用户表所有字段的特征SELECT D.Name as TableName, A.colorder AS ColOrder, A.name AS Name,  COLUMNPROPERTY(A.ID,A.Name, 'IsIdentity') AS IsIdentity,  CASE WHEN EXISTS (SELECT 1 FROM dbo.sysobjects WHERE Xtype = 'PK' AND Name IN (SELECT Name FROM sysindexes WHERE indid IN (SELECT indid FROM sysindexkeys WHERE ID = A.ID AND colid = A.colid)))  THEN 1 ELSE 0 END AS 主键,  B.name AS 类型, A.length AS [长度], A.xprec AS [精度], A.xscale AS [小数], CASE WHEN A.isnullable = 1 THEN 1 ELSE 0 END AS [可为空], ISNULL(E.text, ' ') AS [默认值],  ISNULL(G.[value], ' ') AS [说明]FROM dbo.syscolumns A LEFT OUTER JOIN dbo.systypes B ON A.xtype = B.xusertype INNER JOIN dbo.sysobjects D ON A.id = D.id AND D.xtype = 'U' AND  D.name <> 'dtproperties' LEFT OUTER JOIN dbo.syscomments E ON A.cdefault = E.id  LEFT OUTER JOIN dbo.sysproperties G ON A.id = G.id AND A.colid = G.smallid--WHERE D.Name='tablename' --如果找指定表,把注释去掉ORDER BY 1, 2

------在SQLserver 2005中测试

--查询所有用户表所有字段的特征SELECT  (case when a.colorder=1 then d.name else '' end) as 表名,--如果表名相同就返回空     a.colorder as 字段序号,     a.name as 字段名,     (case when COLUMNPROPERTY( a.id,a.name, 'IsIdentity' )=1 then '√' else '' end) as 标识,     (case when (SELECT count(*) FROM sysobjects--查询主键             WHERE (name in                 (SELECT name FROM sysindexes                 WHERE (id = a.id)  AND (indid in                     (SELECT indid FROM sysindexkeys                      WHERE (id = a.id) AND (colid in                       (SELECT colid FROM syscolumns                       WHERE (id = a.id) AND (name = a.name))               )))))       AND (xtype = 'PK' ))>0 then '√' else '' end) as 主键,--查询主键END  b.name as 类型,  a.length as 占用字节数,  COLUMNPROPERTY(a.id,a.name,'PRECISION' ) as  长度,  isnull(COLUMNPROPERTY(a.id,a.name,'Scale' ),0) as 小数位数,  (case when a.isnullable=1 then '√' else '' end) as 允许空,  isnull(e.text,'' ) as 默认值,  isnull(g.[value],'' ) AS 字段说明  FROM syscolumns a left join systypes b  on a.xtype=b.xusertype  inner join sysobjects d  on a.id=d.id and d.xtype='U' and d.name<> 'dtproperties'  left join syscomments e  on a.cdefault=e.id  left join sys.extended_properties g  on a.id=g.major_id AND a.colid = g.minor_id     --where d.name='PE_U_ValliMessage' --所要查询的表  order by a.id,a.colorder

------提取某个表的字段名

SELECT(case when a.colorder=1 then d.name else '' end) N'表名',a.colorder N'字段序号',a.name N'字段名',isnull(g.[value],'') AS N'字段说明',(case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else ''end) N'标识',(case when (SELECT count(*)FROM sysobjectsWHERE (name in(SELECT nameFROM sysindexesWHERE (id = a.id) AND (indid in(SELECT indidFROM sysindexkeysWHERE (id = a.id) AND (colid in(SELECT colidFROM syscolumnsWHERE (id = a.id) AND (name = a.name))))))) AND(xtype = 'PK'))>0 then '√' else '' end) N'主键',b.name N'类型',a.length N'占用字节数',COLUMNPROPERTY(a.id,a.name,'PRECISION') as N'长度',isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as N'小数位数',(case when a.isnullable=1 then '√'else '' end) N'允许空',isnull(e.text,'') N'默认值'FROM syscolumns aleft join systypes bon a.xtype=b.xusertypeinner join sysobjects don a.id=d.id and d.xtype='U' and d.name<>'dtproperties'left join syscomments eon a.cdefault=e.idleft join sys.extended_properties gon a.id=g.major_id AND a.colid = g.minor_id--where条件输入表名where d.name='ConsumeBillBody'order by object_name(a.id),a.colorder

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