While 循环遍历数据库 [英] While Loop to Iterate through Databases

问题描述

我想知道是否有人可以帮助我创建一个 while 循环来遍历多个数据库以从一个表的两列中获取数据.这是我到目前为止所做的.没有任何作用，因为我不知道如何使 select 语句通过每个数据库工作，关于我从每个数据库(dbo.tbldoc)查询的表

I was wondering if someone could help me with creating a while loop to iterate through several databases to obtain data from one table from two columns. this is was I have done so far. nothing works because i do not know how to make the select statement work through each database with regards to the table that I am querying from each database (dbo.tbldoc)

DECLARE @Loop int
DECLARE @DBName varchar(300)
DECLARE @SQL varchar(max)
DECLARE @tableName VARCHAR(255)

SET @Loop = 1
SET @DBName = ''

   WHILE @Loop = 1
BEGIN

   SELECT [name] FROM sys.databases 
   WHERE [name] like 'z%' and create_date between '2010-10-17' and '2011-01-15'
   ORDER BY [name]

      SET @Loop = @@ROWCOUNT

   IF @Loop = 0
      BREAK

   SET @SQL = ('USE ['+ @DBNAME +']')
      IF EXISTS(SELECT [name] FROM sys.tables WHERE name != 'dbo.tbldoc' )
                  BEGIN
               SELECT SUM(PGCOUNT), CREATED FROM **dbo.tbldoc**
            END
            ELSE
            --BEGIN
               PRINT 'ErrorLog'
            END 

推荐答案

我会考虑 sp_MSForEachDB 这要容易得多...

I would consider sp_MSForEachDB which is a lot easier...

EXEC sp_MSForEachDB 'USE [?]; IF DB_NAME() LIKE ''Z%%''
BEGIN


END
'

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