SqlServer 、MySQL查询库中表明 字段信息

SqlServer

-- sqlserver 查询库中表数量

SELECT count(1) from sysobjects where xtype = \'u\'

-- sqlserver 查询表中的字段信息
select a.name tabelname,

b.name fields,

case c.name when \'numeric\' then \'numeric(\' + convert(varchar,b.length) + \'，\' + convert(varchar,b.xscale) + \')\'

when \'char\' then \'char(\' + convert(varchar,b.length) + \')\'

when \'varchar\' then \'varchar(\' + convert(varchar,b.length) + \')\'

else c.name END AS fieldType

from sysobjects a,syscolumns b,systypes c where a.id=b.id

and a.name=\'表名\' and a.xtype=\'U\'

and b.xtype=c.xtype

MySQL

/*MySql查询指定数据库表数量*/
SELECT COUNT(*) TABLES, table_schema FROM information_schema.TABLES

WHERE table_schema = \'finance_demo\' GROUP BY table_schema;

/*MySql查询指定数据库表名称及注释*/
select table_name,table_comment from information_schema.tables where table_schema=\'finance_demo\'

/*MySql查询指定数据库表中的字段信息*/
select COLUMN_NAME,DATA_TYPE,COLUMN_COMMENT from information_schema.COLUMNS where
table_name = \'dm_settle_platform_details\' and table_schema = \'finance_demo\';