Home Database Mysql Tutorial sql server在多个数据库间快速查询某个表的信息

sql server在多个数据库间快速查询某个表的信息

Jun 07, 2016 pm 03:06 PM
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欢迎进入Windows社区论坛,与300万技术人员互动交流 >>进入 最近出来实习,所在公司的服务器有十几个数据库,为了方便根据某个数据表的 表名 快速找到对应的数据库,又复习了一下游标的知识,写了下面这个sql代码,方便自己的工作。 1.先了解一下系统存储过程和系

欢迎进入Windows社区论坛,与300万技术人员互动交流 >>进入

  最近出来实习,所在公司的服务器有十几个数据库,为了方便根据某个数据表的 表名 快速找到对应的数据库,又复习了一下游标的知识,写了下面这个sql代码,方便自己的工作。

  1.先了解一下系统存储过程和系统表的使用,简单介绍一下我用到的几个系统存储过程(资料参考网络)

  use master --切换到系统数据库,因为下面用到的系统存储过程和系统表大部分存在于该数据库

  go

  exec sp_helpdb --查询 当前 服务器的所有数据库

  select [name] from [sysdatabases] --查询 当前 服务器的所有数据库

  select * from sysobjects where type = 'u'--列出 当前 数据库里所有的表名

  select * from information_schema.tables --列出 当前 数据库里所有的表名(执行对比一下与上面这个语句的查询结果)

  select * from syscolumns where id = object_id('spt_fallback_db') --列出指定表里的所有的信息,包括字段等等(根据需要修改参数)

  2.直接上代码(具体请参考注释,纯属学习,有错请指出)

  use master --切换到系统数据库,因为下面用到的 系统存储过程和系统表 大部分存在于该数据库

  go

  ------------------在当前服务器 根据表的名字 在多个数据库进行查询 得到哪个数据库存在该表的信息------------------

  declare @DataBaseName nvarchar(max) --定义变量(数据库的名字)

  declare cur cursor for select [name] from [sysdatabases] --定义游标,该游标指向 当前 服务器上的所有数据库名字列表

  open cur --打开游标

  create table #TableInfo (table_catalog nvarchar(max),table_schema nvarchar(max),table_name nvarchar(max),table_type nvarchar(max)) --创建临时表用于存储所有数据库的所有表信息

  fetch next from cur into @DataBaseName --获取游标的数据,相当于获取数据库名字列表的第一条数据

  while (@@fetch_status=0)

  begin

  print ''

  print ''

  print '当前数据库: '+ @DataBaseName --读出每个数据库的名字

  insert into #TableInfo --把存储过程查询出来的数据插进临时表

  exec('select table_catalog,table_schema,table_name,table_type from ' + @DataBaseName + '.information_schema.tables') --查询对应数据库的所有表

  print '--------------------------------------------------------------------------------------------------------------------------------------'

  fetch next from cur into @DataBaseName --游标移动

  end

  close cur --关闭游标

  deallocate cur --释放游标

  print ''

  print ''

  print ''

  print ''

  print ''

  declare @TableName nvarchar(max)

  set @TableName = 'MyTableName' --查询条件(根据需要自行修改)

  if exists(select table_name from #TableInfo where table_name = @TableName) --查询指定名字的表

  begin

  print '====================当前服务器存在 ' + @TableName + ' 表,相关信息请到结果窗口查看===================='

  select table_catalog as '所属数据库',table_name as '表名' from #TableInfo where table_name = @TableName --输出表的相关信息,从这些信息就可以知道这个表在哪个数据库

  end

  else

  begin

  print '--------------------当前服务器不存在 ' + @TableName + ' 表--------------------'

  end

  drop table #TableInfo --删除临时表

sql server在多个数据库间快速查询某个表的信息

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