I'm writing a script that, when executed, will drop any tables in a list of given DBs if the DB Name + Table Name combo does not exist in a table named CleanUpTableList. All DBs reside on the same server. I am using SQL Server 2014.I am trying to do this by creating an outer cursor loop which cycles through the list of DB names and an inner cursor loop which pulls in a list of table names within the given database which are not found in CleanUpTableList and drops those tables. However, it seems that the outer loop fails to change databases. The script will only access the relevant tables of the starting database X times, with X being however many database name entries there are in the outer cursor. So, for example, if I start in Database1, and I have three database name entries in my outer cursor, instead of getting:[code="sql"]DROP TABLE Database1..TableBDROP TABLE Database1..TableCDROP TABLE Database2..TableEDROP TABLE Database2..TableFDROP TABLE Database3..TableHDROP TABLE Database3..TableI[/code]I get:[code="sql"]DROP TABLE Database1..TableBDROP TABLE Database1..TableCDROP TABLE Database1..TableBDROP TABLE Database1..TableCDROP TABLE Database1..TableBDROP TABLE Database1..TableC[/code]...Which is not really what I want, so I am assuming something is amiss in the outer loop. I know the usual DB change command is[code="sql"]USE Database1;GO[/code]But I wasn't able to figure out how to do that with EXEC(). It kept telling me there was a syntax error near GO, I assume because GO can't be on the same line as 'USE Database1;', and I don't know how make a new line when using EXEC(). I tried using[code="sql"]SET @ChangeDB = 'USE ' + @DatabaseName + ';'EXEC(@ChangeDB + CHAR(13) + 'GO') [/code]and[code="sql"]SET @ChangeDB ='USE ' + @DatabaseName + ';' +CHAR(13) + 'GO'EXEC(@ChangeDB) [/code]but these also returned a syntax error.Here is the relevant code:DB/Table Creation Script:[code="sql"]CREATE DATABASE Database1;CREATE DATABASE Database2;CREATE DATABASE Database3;CREATE DATABASE Database4;CREATE TABLE Database1.dbo.TableA (Column1 INT, Column2 INT);CREATE TABLE Database1.dbo.TableB (Column1 INT, Column2 INT);CREATE TABLE Database1.dbo.TableC (Column1 INT, Column2 INT);CREATE TABLE Database2.dbo.TableD (Column1 INT, Column2 INT);CREATE TABLE Database2.dbo.TableE (Column1 INT, Column2 INT);CREATE TABLE Database2.dbo.TableF (Column1 INT, Column2 INT);CREATE TABLE Database3.dbo.TableG (Column1 INT, Column2 INT);CREATE TABLE Database3.dbo.TableH (Column1 INT, Column2 INT);CREATE TABLE Database3.dbo.TableI (Column1 INT, Column2 INT);CREATE TABLE Database4.dbo.CleanUpTableList (DBName VARCHAR(20), TableName VARCHAR(20));INSERT INTO Database4..CleanUpTableList VALUES ('Database1','TableA')INSERT INTO Database4..CleanUpTableList VALUES ('Database2','TableD')INSERT INTO Database4..CleanUpTableList VALUES ('Database3', 'TableG') [/code]Clean Up Script:[code="sql"]DECLARE @fetch_database_cursor INTDECLARE @DatabaseName VARCHAR(50)DECLARE DatabaseList CURSOR FOR select name from sys.databases where name IN ('Database1','Database2', 'Database3' ) OPEN DatabaseListFETCH NEXT FROM DatabaseList INTO @DatabaseName/* Keep track of the outer loop FETCH_STATUS in a local variable */SET @fetch_database_cursor = @@FETCH_STATUS/* Use outer loop FETCH_STATUS local variable as condition for outer WHILE loop */WHILE @fetch_database_cursor = 0BEGIN DECLARE @ChangeDB VARCHAR(2500) DECLARE @TableName VARCHAR(50) DECLARE @ExecuteSQL VARCHAR(2500) DECLARE @fetch_table_cursor INT /* Change DB here */ SET @ChangeDB = 'USE ' + @DatabaseName EXEC(@ChangeDB) /* Declare inner cursor */ DECLARE TableList CURSOR FOR select table_name from information_schema.tables WHERE TABLE_TYPE = 'BASE TABLE' AND table_name NOT IN ( SELECT TableName FROM Database4..CleanUpTableList WHERE DBName = @DatabaseName ) ORDER BY table_name OPEN TableList FETCH NEXT FROM TableList INTO @TableName /* Store inner cursor fetch_status in local variable */ SET @fetch_table_cursor = @@FETCH_STATUS /* Use inner cursor fetch_status local variable as condition for inner WHILE loop */ WHILE @fetch_table_cursor = 0 BEGIN SET @ExecuteSQL = 'DROP TABLE ' +@Tablename EXEC(@ExecuteSQL) SELECT @Tablename, 'Has Been Successfully Dropped' FETCH NEXT FROM TableList INTO @TableName SET @fetch_table_cursor=@@FETCH_STATUS END /* Close and deallocate inner cursor */ CLOSE TableList DEALLOCATE TableList FETCH NEXT FROM DatabaseList INTO @DatabaseName SET @fetch_database_cursor = @@FETCH_STATUSEND/* Close and deallocate outer cursor */CLOSE DatabaseListDEALLOCATE DatabaseList[/code]Any suggestions are appreciated.
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