写代码生成器的时候经常用到的SQL
1、表添加注释
EXECUTE sp_addextendedproperty N’MS_Description’, N’表注释’, N’user’, N’dbo’, N’table’, N’表名’, NULL, NULL
2、查询表名、表注释、表的创建时间
SELECT ROW_NUMBER() OVER(ORDER BY t.name ASC) AS Id, t.name AS TableName,p.value AS Comment,t.create_date AS CreateDate FROMsys.tables AS t LEFT JOIN sys.extended_properties AS p ON p.major_id=t.object_id AND p.minor_id=0
3、查询表字段的详细信息
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 parent_obj=a.id 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,占用字节数 = a.length,长度 = 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],”)FROMsyscolumns aleft joinsystypes bona.xusertype=b.xusertypeinner joinsysobjects dona.id=d.id and d.xtype=’U’ and d.name<>’dtproperties’left joinsyscomments eona.cdefault=e.idleft joinsys.extended_properties gona.id=G.major_id and a.colid=g.minor_idleft join sys.extended_properties fond.id=f.major_id and f.minor_id=0whered.name=’tab_user’ –如果只查询指定表,加上此条件order bya.id,a.colorder
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