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';