Sql Server 表结构相关

1.库表列信息

--取所有库
SELECT Name FROM Master..SysDatabases ORDER BY Name

--查询所有表
select name  from 库名..sysobjects where xtype in( 'u','v') order by xtype,name 

--查询所有列
SELECT COLUMN_NAME FROM 库名.INFORMATION_SCHEMA.COLUMNS WHERE TABLE_Name = '表名'
SELECT name FROM 库名..syscolumns WHERE id = Object_Id('表名')--这个不知为何有时不好用 可能.net中用的原因 查询还没出过错

2.查询表结构  无法跨库查询 使用 columnproperty() 函数

SELECT  obj.name TblName,
                col.colorder AS Code ,
                col.name AS FldName ,
                ISNULL(ep.[value], '') AS FldDescription ,
                t.name AS DataType ,
                col.length AS DataLenth ,
                ISNULL(COLUMNPROPERTY(col.id, col.name, 'Scale'), 0) AS DecimalLenth ,
                CASE WHEN COLUMNPROPERTY(col.id, col.name, 'IsIdentity') = 1 THEN ''
                     ELSE ''
                END AS IsAutoIncrement ,
                CASE WHEN EXISTS ( SELECT   1
                                   FROM     dbo.sysindexes si
                                            INNER JOIN dbo.sysindexkeys sik ON si.id = sik.id
                                                                      AND si.indid = sik.indid
                                            INNER JOIN dbo.syscolumns sc ON sc.id = sik.id
                                                                      AND sc.colid = sik.colid
                                            INNER JOIN dbo.sysobjects so ON so.name = si.name
                                                                      AND so.xtype = 'PK'
                                   WHERE    sc.id = col.id
                                            AND sc.colid = col.colid ) THEN ''
                     ELSE ''
                END AS PrimaryKey ,
                CASE WHEN col.isnullable = 1 THEN ''
                     ELSE ''
                END AS AlowNull ,
                ISNULL(comm.text, '') AS DefaultValue
        FROM    dbo.syscolumns col
                LEFT  JOIN dbo.systypes t ON col.xtype = t.xusertype
                inner JOIN dbo.sysobjects obj ON col.id = obj.id
                                                 AND obj.xtype = 'U'
                                                 AND obj.status >= 0
                LEFT  JOIN dbo.syscomments comm ON col.cdefault = comm.id
                LEFT  JOIN sys.extended_properties ep ON col.id = ep.major_id
                                                              AND col.colid = ep.minor_id
                                                              AND ep.name = 'MS_Description'
                LEFT  JOIN sys.extended_properties epTwo ON obj.id = epTwo.major_id
                                                                 AND epTwo.minor_id = 0
                                                                 AND epTwo.name = 'MS_Description'
        WHERE   obj.name = 'tbl_Data_Schemes'--表名
        ORDER BY col.colorder ;

3.填写列的备注信息

EXEC sp_addextendedproperty 'MS_Description', '说明性文字', 'user', dbo,
     'table', 表名, 'column', 列名