While Loop to Iterate through Databases

Question

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

Answer 1

I ended up writing one last week on the fly for some stuff I was doing.

Blog post here:

http://tsells.wordpress.com/2012/02/14/sql-server-database-iterator/

Here is the code.

SET NOCOUNT ON
GO
use master
go

Declare
@dbname nvarchar(500),
@variable1 int,
@variable2 int,
@variable3 int,
@totaldb int = 0,
@totaldbonserver int = 0,
@totaldbwithmatches int = 0

-- Get non system databases
Declare mycursor CURSOR for select name, database_id from SYS.databases where database_id > 4 order by name desc

open mycursor

fetch next from mycursor into @dbname, @variable1

while (@@FETCH_STATUS <> -1)
    BEGIN
        DECLARE @ParmDefinition NVARCHAR(500)
        Declare @mysql nvarchar(500) = 'select @variable2OUT = COUNT(*) from [' + @dbname + '].INFORMATION_SCHEMA.TABLES where Upper(TABLE_NAME) like ''MyTable''';
        SET @ParmDefinition = N'@variable2OUT int OUTPUT'
        set @totaldbonserver = @totaldbonserver + 1
        Execute sp_executesql @mysql, @ParmDefinition, @variable2 OUTPUT            

        if @variable2 = 1
        BEGIN
            DECLARE @ParmDefinition2 NVARCHAR(500)
            Declare @mysql2 nvarchar(500) = 'select @variable2OUT = COUNT(*) from [' + @dbname + '].dbo.MyTable';
            SET @ParmDefinition2 = N'@variable2OUT int OUTPUT'
            Execute sp_executesql @mysql2, @ParmDefinition2, @variable3 OUTPUT
            set @totaldb = @totaldb + 1

            if @variable3 > 1
            BEGIN
                Print @dbname + ' matched the criteria'
                set @totaldbwithmatches = @totaldbwithmatches + 1
            END
            ELSE
            Select 1
        END    

        fetch next from mycursor into @dbname, @variable1
    END
    PRINT 'Total databases on server: '
    Print @totaldbonserver

    PRINT 'Total databases tested () : '
    Print @totaldb

    PRINT 'Total databases with matches: '
    Print @totaldbwithmatches
CLOSE mycursor
DEALLOCATE mycursor