获取Oracle、SqlServer、Access中表名、字段和主键(转)
2010-12-16 09:34
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一、oracle 1、获取当前oracle数据库中的所有表 select table_name from user_tables2、查询某个表中的字段名称、类型、精度、长度、是否为空 select COLUMN_NAME,DATA_TYPE,DATA_PRECISION,DATA_SCALE,NULLABLE from user_tab_columns where table_name ='YourTableName' 3、查询某个表中的主键字段名 select col.column_name from user_constraints con, user_cons_columns col where con.constraint_name = col.constraint_name and con.constraint_type='P' and col.table_name = 'YourTableName' 4、查询某个表中的外键字段名称、所引用表名、所应用字段名 select distinct(col.column_name),r.table_name,r.column_name from user_constraints con, user_cons_columns col, (select t2.table_name,t2.column_name,t1.r_constraint_name from user_constraints t1,user_cons_columns t2 where t1.r_constraint_name=t2.constraint_name and t1.table_name='YourTableName' ) r where con.constraint_name=col.constraint_name and con.r_constraint_name=r.r_constraint_name and con.table_name='YourTableName' 5、如何从Oracle中取得表的注释 user_tab_comments;表注释 user_col_comments;表字段注释 以上两个只能获取自己用户的表的注释信息,如果要访问自己 能够访问的其他用户的表,则需要使用: all_tab_comments;表注释 all_col_comments;表字段注释 当然,如果有DBA权限,则可以使用 dba_tab_comments;表注释 dba_col_comments;表字段注释 dba*和all*最好指定owner条件。user*没有该字段 user_tab_comments;表注释 user_col_comments;表字段注释 二、SQLServer 1、读取库中的所有表名 select name from sysobjects where xtype='u' 2、字段 SELECT c.name,t.name,c.xprec,c.xscale,c.isnullable FROM systypes t,syscolumns c WHERE t.xtype=c.xtype AND c.id = (SELECT id FROM sysobjects WHERE name='YourTableName') ORDER BY c.colid 3、主键(参考SqlServer系统存储过程sp_pkeys) select COLUMN_NAME = convert(sysname,c.name) from sysindexes i, syscolumns c, sysobjects o where o.id = object_id('[YourTableName]') and o.id = c.id and o.id = i.id and (i.status & 0x800) = 0x800 and (c.name = index_col ('[YourTableName]', i.indid, 1) or c.name = index_col ('[YourTableName]', i.indid, 2) or c.name = index_col ('[YourTableName]', i.indid, 3) or c.name = index_col ('[YourTableName]', i.indid, 4) or c.name = index_col ('[YourTableName]', i.indid, 5) or c.name = index_col ('[YourTableName]', i.indid, 6) or c.name = index_col ('[YourTableName]', i.indid, 7) or c.name = index_col ('[YourTableName]', i.indid, 8) or c.name = index_col ('[YourTableName]', i.indid, 9) or c.name = index_col ('[YourTableName]', i.indid, 10) or c.name = index_col ('[YourTableName]', i.indid, 11) or c.name = index_col ('[YourTableName]', i.indid, 12) or c.name = index_col ('[YourTableName]', i.indid, 13) or c.name = index_col ('[YourTableName]', i.indid, 14) or c.name = index_col ('[YourTableName]', i.indid, 15) or c.name = index_col ('[YourTableName]', i.indid, 16) ) 4、外键 select t1.name,t2.rtableName,t2.name from (select col.name, f.constid as temp from syscolumns col,sysforeignkeys f where f.fkeyid=col.id and f.fkey=col.colid and f.constid in ( select distinct(id) from sysobjects where OBJECT_NAME(parent_obj)='YourTableName' and xtype='F' ) ) as t1 , (select OBJECT_NAME(f.rkeyid) as rtableName,col.name, f.constid as temp from syscolumns col,sysforeignkeys f where f.rkeyid=col.id and f.rkey=col.colid and f.constid in ( select distinct(id) from sysobjects where OBJECT_NAME(parent_obj)='YourTableName' and xtype='F' ) ) as t2 where t1.temp=t2.temp 三、Access 1、所有表清单 conn.Open(); dt= conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" }); 2、表结构 conn.Open(); dtColumnsInfo = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Columns, new object[] { null, null, strTableName,null }); 原文链接:http://blog.sina.com.cn/dongshengjing
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