Tag Archives: at the same time

How to remove Logins and Users from SQL Server en masse

The script below will create SQL code to drop every user and login from a SQL Server instance. Not very useful unless you’re trying to give someone, possibly yourself, a very bad day. Don’t worry though the script does not execute the code, to reiterate it only generates it. However given the potential for you using the output of the script incorrectly this post comes with a disclaimer (Link to disclaimer).

To make the script a little more useful you can populate a temp table called #TheseUsersOnly in the script with the specific login/user names you want to remove.

This will limit the code outputted to only the logins and users specified.

Go to the /*INSERT LOGINS HERE*/ section to populate the temp table with hard coded login/user names.

Be sure to thoroughly review the code outputted before executing it.

If you encounter this error message “The database principal owns a schema in the database, and cannot be dropped“, see this post (Link).

SET NOCOUNT ON;

/*DECLARE VARIABLES*/
DECLARE @Database TABLE (DbName SYSNAME);
DECLARE @DbName AS SYSNAME;
DECLARE @sqlCommand AS VARCHAR(MAX);
DECLARE @UserName AS VARCHAR(128);
DECLARE @i AS INT;
DECLARE @z AS INT;
DECLARE @j AS INT;
DECLARE @y AS INT;

/*DROP EXISTING TEMP TABLES*/
IF OBJECT_ID('tempdb..#ErrorTable') IS NOT NULL
BEGIN
	DROP TABLE #ErrorTable
END;

IF OBJECT_ID(N'tempdb..#User') IS NOT NULL
BEGIN
	DROP TABLE #User
END;

IF OBJECT_ID(N'tempdb..#UserOrdered') IS NOT NULL
BEGIN
	DROP TABLE #UserOrdered
END;

IF OBJECT_ID(N'tempdb..#TheseUsersOnly') IS NOT NULL
BEGIN
	DROP TABLE #TheseUsersOnly
END;

IF OBJECT_ID('tempdb..#Return') IS NOT NULL
BEGIN
	DROP TABLE #Return
END;

/*CREATE TEMP TABLES*/
/*THE ERROR TABLE WILL STORE THE DYNAMIC SQL THAT DID NOT WORK*/
CREATE TABLE [#ErrorTable] ([SqlCommand] VARCHAR(MAX)) ON [PRIMARY];

CREATE TABLE #User (
	Id INT NOT NULL IDENTITY(1, 1) PRIMARY KEY
	,DbName SYSNAME NULL
	,UserName SYSNAME NULL
	);

CREATE TABLE #UserOrdered (
	Id INT NOT NULL IDENTITY(1, 1) PRIMARY KEY
	,DbName SYSNAME NULL
	,UserName SYSNAME NULL
	);

CREATE TABLE #TheseUsersOnly (UserName SYSNAME NULL);

CREATE TABLE [#Return] ([SqlCommand] VARCHAR(MAX)) ON [PRIMARY];

/*INSERT LOGINS HERE*/
/*
/*Single Login*/
INSERT INTO #TheseUsersOnly (UserName)
SELECT 'Test_Login';
*/
/*
/*Multiple Logins*/
INSERT INTO #TheseUsersOnly (UserName)
VALUES (Test_Login_1)
,(Test_Login_2)
,(Test_Login_3)
*/
SET @DbName = '';

/*GENERATE LIST TABLE OF DATABASE NAMES*/
INSERT INTO @Database (DbName)
SELECT NAME
FROM master.dbo.sysdatabases
WHERE NAME <> 'tempdb'
ORDER BY NAME ASC;

/*GENERATE LIST OF USERS FOR EACH DATABASE*/
WHILE @DbName IS NOT NULL
BEGIN
	SET @DbName = (
			SELECT MIN(DbName)
			FROM @Database
			WHERE DbName > @DbName
			)
	SET @sqlCommand = '
INSERT INTO #User (
DbName
,UserName
)
SELECT ' + '''' + @DbName + '''' + ' AS DbName 
,princ.name AS UserName
FROM ' + QUOTENAME(@DbName) + '.sys.database_principals AS princ
WHERE princ.name IS NOT NULL
';

	/*OPTION TO LIMIT USERS TO ONLY THE USERS SPECIFIED*/
	IF EXISTS (
			SELECT *
			FROM #TheseUsersOnly
			)
	BEGIN
		SET @sqlCommand = @sqlCommand + 'AND princ.Name IN (SELECT UserName FROM #TheseUsersOnly);'
	END
	ELSE
	BEGIN
		SET @sqlCommand = @sqlCommand + ';'
	END

	/*ERROR HANDLING*/
	BEGIN TRY
		EXEC (@sqlCommand)
	END TRY

	BEGIN CATCH
		INSERT INTO #ErrorTable
		SELECT (@sqlCommand)
	END CATCH
END;

/*REORDER USER TABLE BY NAME ALPHABETICALLY ASCENDING*/
INSERT INTO #UserOrdered (
	DbName
	,UserName
	)
SELECT DbName
	,UserName
FROM #User
ORDER BY UserName ASC
	,DbName ASC;

/*SET LOOP VARIABLES*/
SET @y = 0;
SET @i = 1;
SET @z = (
		SELECT COUNT(*)
		FROM #UserOrdered
		);

/*LOOP TO GENERATE SQL CODE*/
WHILE @i <= @z
BEGIN
	SELECT @DbName = DbName
		,@UserName = UserName
	FROM #UserOrdered
	WHERE Id = @i

	IF @y = 0
		SET @j = 1;

	BEGIN
		SET @y = (
				SELECT COUNT(UserName)
				FROM #UserOrdered
				WHERE UserName = @UserName
				)
	END

	SET @sqlCommand = 'USE [' + @DbName + '];
IF EXISTS (SELECT * FROM ' + QUOTENAME(@DbName) + '.sys.database_principals WHERE name = N' + '''' + @UserName + '''' + ')
BEGIN DROP USER [' + @UserName + '] END;
';

	/*ERROR HANDLING*/
	BEGIN TRY
		INSERT INTO #Return
		SELECT (@sqlCommand)
	END TRY

	BEGIN CATCH
		INSERT INTO #ErrorTable
		SELECT (@sqlCommand)
	END CATCH

	IF @j = @y
	BEGIN
		IF EXISTS (
				SELECT NAME
				FROM master.sys.server_principals
				WHERE NAME = @UserName
				)
		BEGIN
			INSERT INTO #Return (SqlCommand)
			SELECT 'USE [master];
IF EXISTS (SELECT NAME
FROM master.sys.server_principals
WHERE NAME = ' + '''' + @UserName + '''' + '
) BEGIN
DROP LOGIN [' + @UserName + '] END;'
		END

		SET @y = 0;
	END

	SET @i = @i + 1;
	SET @j = @j + 1;
END

/*RESULTS*/
SELECT SqlCommand
FROM #ErrorTable;

SELECT SqlCommand
FROM #Return;

/*HOUSEKEEPING*/
IF OBJECT_ID('tempdb..#ErrorTable') IS NOT NULL
BEGIN
	DROP TABLE #ErrorTable
END;

IF OBJECT_ID(N'tempdb..#User') IS NOT NULL
BEGIN
	DROP TABLE #User
END;

IF OBJECT_ID(N'tempdb..#UserOrdered') IS NOT NULL
BEGIN
	DROP TABLE #UserOrdered
END;

IF OBJECT_ID(N'tempdb..#TheseUsersOnly') IS NOT NULL
BEGIN
	DROP TABLE #TheseUsersOnly
END;

IF OBJECT_ID('tempdb..#Return') IS NOT NULL
BEGIN
	DROP TABLE #Return
END;