你的位置:首页 > 数据库

[数据库]SQL获取数据库名,表名,列名,说明等信息


SQL获取数据库名,表名,列名,说明等信息 转自汉城节度使 http://www.cnblogs.com/tuqun/p/3724000.html
/**************************************************************************************************************1、获取所有用户名:islogin='1' :表示帐户islogin='0' :表示角色status='2' :表示用户帐户status='0' :表示系统帐户**************************************************************************************************************/SELECT nameFROM sysusersWHERE status = '0' AND islogin = '1'/**************************************************************************************************************2、获取所有数据库名:**************************************************************************************************************/SELECT nameFROM master..sysdatabasesORDER BY name/**************************************************************************************************************3、获取所有表名:XType='U' :表示所有用户表;XType='S' :表示所有系统表;**************************************************************************************************************/SELECT nameFROM 数据库名..sysobjectsWHERE xtype = 'U'ORDER BY name/**************************************************************************************************************4、获取所有字段名:**************************************************************************************************************/SELECT nameFROM syscolumnsWHERE id = Object_id('表名')/**************************************************************************************************************5、获取数据库所有类型:**************************************************************************************************************/SELECT nameFROM systypes/**************************************************************************************************************6、获取主键字段:**************************************************************************************************************/SELECT nameFROM syscolumnsWHERE id = Object_id('表名') AND colid = (SELECT TOP 1 keyno FROM sysindexkeys WHERE id = Object_id('表名'))/**************************************************************************************************************7、获取表字段的基本信息:a.**************************************************************************************************************/SELECT 字段名 = Rtrim(b.name) ,主键 = CASE WHEN h.id IS NOT NULL THEN 'PK' ELSE '' END ,字段类型 = Type_name(b.xusertype) + CASE WHEN b.colstat & 1 = 1 THEN '[ID(' + CONVERT(VARCHAR,Ident_seed(a.name)) + ',' + CONVERT(VARCHAR,Ident_incr(a.name)) + ')]' ELSE '' END ,长度 = b.length ,允许空 = CASE b.isnullable WHEN 0 THEN 'N' ELSE 'Y' END ,默认值 = Isnull(e.TEXT,'') ,字段说明 = Isnull(c.VALUE,'')FROM sysobjects a INNER JOIN sys.all_objects aa ON a.id=aa.object_id AND schema_name(schema_id)='dbo' ,syscolumns b LEFT OUTER JOIN sys.extended_properties c ON b.id = c.major_id AND b.colid = c.minor_id LEFT OUTER JOIN syscomments e ON b.cdefault = e.id LEFT OUTER JOIN (SELECT g.id ,g.colid FROM sysindexes f ,sysindexkeys g WHERE (f.id = g.id) AND (f.indid = g.indid) AND (f.indid > 0) AND (f.indid < 255) AND (f.status & 2048) <> 0) h ON (b.id = h.id) AND (b.colid = h.colid)WHERE (a.id = b.id) AND (a.id = Object_id('表名')) --要查询的表改成你要查询表的名称ORDER BY b.colid/**************************************************************************************************************b.**************************************************************************************************************/SELECT 表名 = CASE WHEN a.colorder = 1 THEN d.name ELSE '' END ,表说明 = CASE WHEN a.colorder = 1 THEN Isnull(f.VALUE,'') ELSE '' END ,字段序号 = a.colorder ,字段名 = a.name ,标识 = CASE WHEN Columnproperty(a.id,a.name,'IsIdentity') = 1 THEN '√' ELSE '' END ,主键 = CASE WHEN EXISTS (SELECT 1 FROM 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 '√' ELSE '' END ,类型 = b.name ,字段长度 = a.length ,占用字节数 = Columnproperty(a.id,a.name,'PRECISION') ,小数位数 = Isnull(Columnproperty(a.id,a.name,'Scale'),0) ,允许空 = CASE WHEN a.isnullable = 1 THEN '√' ELSE '' END ,默认值 = Isnull(e.TEXT,'') ,字段说明 = Isnull(g.[value],'')FROM syscolumns a LEFT JOIN systypes b ON a.xusertype = b.xusertype INNER JOIN sysobjects d ON (a.id = d.id) AND (d.xtype = 'U') AND (d.name <> 'dtproperties') INNER JOIN sys.all_objects c ON d.id=c.object_id AND schema_name(schema_id)='dbo' 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) LEFT JOIN sys.extended_properties f ON (d.id = f.major_id) AND (f.minor_id = 0)--where d.name='要查询的表' --如果只查询指定表,加上此条件ORDER BY a.id ,a.colorder/***************************************************************************************************************c. 前两种不完整~****************************************************************************************************************/-- 資料庫中所有資料表:透過內定的Stored Procedure sp_tablesEXEC sp_tables @table_name = '%',@table_owner = 'dbo',@table_qualifier = @DBName; -- 取得資料表SchemaEXEC sp_columns @TableName -- 取得欄位說明、備註(Extended Property):這個是透過Sql內定的Function來處理SELECT * FROM ::fn_listextendedproperty(NULL, 'user', 'dbo', 'table', @TableName, 'column', default) -- 取得主索引EXEC sp_pkeys @TableName /**************************************************************************************************************表及字段描述信息处理示例**************************************************************************************************************/--创建表CREATE TABLE 表 ( a1 VARCHAR(10) ,a2 CHAR(2))--为表添加描述信息EXECUTE Sp_addextendedproperty N'MS_Description' , '人员信息表' , N'user' , N'dbo' , N'table' , N'表' , NULL , NULLEXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'人员信息表' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'表' --为字段a1添加描述信息EXECUTE Sp_addextendedproperty N'MS_Description' , '姓名' , N'user' , N'dbo' , N'table' , N'表' , N'column' , N'a1'EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'人员信息表' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'表', @level2type=N'COLUMN',@level2name=N'a1' --为字段a2添加描述信息EXECUTE Sp_addextendedproperty N'MS_Description' , '性别' , N'user' , N'dbo' , N'table' , N'表' , N'column' , N'a2'--更新表中列a1的描述属性:EXEC Sp_updateextendedproperty 'MS_Description' , '字段1' , 'user' , dbo , 'table' , '表' , 'column' , a1--显示表的描述属性SELECT *FROM ::fn_listextendedproperty(NULL,'user','dbo','table','表','column',NULL)--删除表中列a1的描述属性:EXEC Sp_dropextendedproperty 'MS_Description' , 'user' , dbo , 'table' , '表' , 'column' , a1--删除测试DROP TABLE 表