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Performing database restore operation is one of the most common task for DBA's and as part of that process they have to script out user permission before database restore and if this task is missed out and database is restored, then existing permission of target database will be wiped off and then fixing user permission can become one of the cumbersome task. so never miss to take user permission before performing database restore operation. Following query can be used to achieve the same and got this query from here.

--Use below to script out the permissions for a particular database

use <DB>
go
SET NOCOUNT ON

/*Prep statements*/
IF OBJECT_ID('tempdb..##tbl_db_principals_statements') IS NOT NULL DROP TABLE ##tbl_db_principals_statements 
CREATE TABLE ##tbl_db_principals_statements (stmt varchar(max), result_order decimal(4,1))
IF ((SELECT SUBSTRING(convert(sysname, SERVERPROPERTY('productversion')), 1, charindex('.',convert(sysname, SERVERPROPERTY('productversion')))-1)) > 10)
EXEC ('
INSERT INTO ##tbl_db_principals_statements (stmt, result_order)
   SELECT   
      CASE WHEN rm.authentication_type IN (2, 0) /* 2=contained database user with password, 0 =user without login; create users without logins*/ THEN (''IF NOT EXISTS (SELECT [name] FROM sys.database_principals WHERE [name] = '' + SPACE(1) + '''''''' + [name] + '''''''' + '') BEGIN CREATE USER '' + SPACE(1) + QUOTENAME([name]) + '' WITHOUT LOGIN WITH DEFAULT_SCHEMA = '' + QUOTENAME([default_schema_name]) + SPACE(1) + '', SID = '' + CONVERT(varchar(1000), sid, 1) + SPACE(1) + '' END; '')
         ELSE (''IF NOT EXISTS (SELECT [name] FROM sys.database_principals WHERE [name] = '' + SPACE(1) + '''''''' + [name] + '''''''' + '') BEGIN CREATE USER '' + SPACE(1) + QUOTENAME([name]) + '' FOR LOGIN '' + QUOTENAME(suser_sname([sid])) + CASE WHEN [type] <>''G'' THEN '' WITH DEFAULT_SCHEMA = '' + QUOTENAME(ISNULL([default_schema_name], ''dbo'')) ELSE '''' END + SPACE(1) + ''END; '') 
         END AS [-- SQL STATEMENTS --],
         3.1 AS [-- RESULT ORDER HOLDER --]
   FROM   sys.database_principals AS rm
   WHERE [type] IN (''U'', ''S'', ''G'') /* windows users, sql users, windows groups */
     AND NAME NOT IN (''guest'',''dbo'')')

ELSE IF ((SELECT SUBSTRING(convert(sysname, SERVERPROPERTY('productversion')), 1, charindex('.',convert(sysname, SERVERPROPERTY('productversion')))-1)) IN (9,10))
EXEC ('
INSERT INTO ##tbl_db_principals_statements (stmt, result_order)
   SELECT   (''IF NOT EXISTS (SELECT [name] FROM sys.database_principals WHERE [name] = '' + SPACE(1) + '''''''' + [name] + '''''''' + '') BEGIN CREATE USER '' + SPACE(1) + QUOTENAME([name]) + '' FOR LOGIN '' + QUOTENAME(suser_sname([sid])) + CASE WHEN [type] <>''G'' THEN '' WITH DEFAULT_SCHEMA = '' + QUOTENAME(ISNULL([default_schema_name], ''dbo'')) ELSE '''' END + SPACE(1) + ''END; '') AS [-- SQL STATEMENTS --],
         3.1 AS [-- RESULT ORDER HOLDER --]
   FROM   sys.database_principals AS rm
   WHERE [type] IN (''U'', ''S'', ''G'') /* windows users, sql users, windows groups */
   AND NAME NOT IN (''guest'',''dbo'')')

--SELECT * FROM ##tbl_db_principals_statements




DECLARE 
    @sql VARCHAR(2048)
    ,@sort INT 

DECLARE tmp CURSOR FOR


/*********************************************/
/*********   DB CONTEXT STATEMENT    *********/
/*********************************************/
SELECT '-- [-- DB CONTEXT --] --' AS [-- SQL STATEMENTS --],
      1 AS [-- RESULT ORDER HOLDER --]
UNION
SELECT   'USE' + SPACE(1) + QUOTENAME(DB_NAME()) AS [-- SQL STATEMENTS --],
      1.1 AS [-- RESULT ORDER HOLDER --]

UNION

SELECT '' AS [-- SQL STATEMENTS --],
      2 AS [-- RESULT ORDER HOLDER --]

UNION

/*********************************************/
/*********     DB USER CREATION      *********/
/*********************************************/

   SELECT '-- [-- DB USERS --] --' AS [-- SQL STATEMENTS --],
         3 AS [-- RESULT ORDER HOLDER --]
   UNION

   SELECT   
      [stmt],
         3.1 AS [-- RESULT ORDER HOLDER --]
   FROM   ##tbl_db_principals_statements
   --WHERE [type] IN ('U', 'S', 'G') -- windows users, sql users, windows groups
   WHERE [stmt] IS NOT NULL

UNION

/*********************************************/
/*********    MAP ORPHANED USERS     *********/
/*********************************************/

SELECT '-- [-- ORPHANED USERS --] --' AS [-- SQL STATEMENTS --],
      4 AS [-- RESULT ORDER HOLDER --]
UNION
SELECT   'ALTER USER [' + rm.name + '] WITH LOGIN = [' + rm.name + ']',
      4.1 AS [-- RESULT ORDER HOLDER --]
FROM   sys.database_principals AS rm
 Inner JOIN sys.server_principals as sp
 ON rm.name = sp.name COLLATE DATABASE_DEFAULT and rm.sid <> sp.sid
WHERE rm.[type] IN ('U', 'S', 'G') -- windows users, sql users, windows groups
 AND rm.name NOT IN ('dbo', 'guest', 'INFORMATION_SCHEMA', 'sys', 'MS_DataCollectorInternalUser')

UNION

/*********************************************/
/*********    DB ROLE PERMISSIONS    *********/
/*********************************************/
SELECT '-- [-- DB ROLES --] --' AS [-- SQL STATEMENTS --],
      5 AS [-- RESULT ORDER HOLDER --]
UNION

SELECT   'IF DATABASE_PRINCIPAL_ID(' + QUOTENAME([name],'''') COLLATE database_default + ') IS NULL' + SPACE(1) + 'CREATE ROLE'
   + SPACE(1) + QUOTENAME([name]),
      5.1 AS [-- RESULT ORDER HOLDER --]
FROM sys.database_principals
WHERE [type] ='R' -- R = Role
   AND [is_fixed_role] = 0
--ORDER BY [name] ASC
UNION

SELECT   'IF DATABASE_PRINCIPAL_ID(' + QUOTENAME(USER_NAME(rm.member_principal_id),'''') COLLATE database_default + ') IS NOT NULL' + SPACE(1) + 'EXEC sp_addrolemember @rolename ='
   + SPACE(1) + QUOTENAME(USER_NAME(rm.role_principal_id), '''') COLLATE database_default + ', @membername =' + SPACE(1) + QUOTENAME(USER_NAME(rm.member_principal_id), '''') COLLATE database_default AS [-- SQL STATEMENTS --],
      5.2 AS [-- RESULT ORDER HOLDER --]
FROM   sys.database_role_members AS rm
WHERE   USER_NAME(rm.member_principal_id) IN (   
                                    --get user names on the database
                                    SELECT [name]
                                    FROM sys.database_principals
                                    WHERE [principal_id] > 4 -- 0 to 4 are system users/schemas
                                    and [type] IN ('G', 'S', 'U') -- S = SQL user, U = Windows user, G = Windows group
                                   )
--ORDER BY rm.role_principal_id ASC


UNION

SELECT '' AS [-- SQL STATEMENTS --],
      7 AS [-- RESULT ORDER HOLDER --]

UNION

/*********************************************/
/*********  OBJECT LEVEL PERMISSIONS *********/
/*********************************************/
SELECT '-- [-- OBJECT LEVEL PERMISSIONS --] --' AS [-- SQL STATEMENTS --],
      7.1 AS [-- RESULT ORDER HOLDER --]
UNION
SELECT   'IF DATABASE_PRINCIPAL_ID(' + QUOTENAME(USER_NAME(usr.principal_id),'''') COLLATE database_default + ') IS NOT NULL' + SPACE(1) +
      CASE 
         WHEN perm.state <> 'W' THEN perm.state_desc 
         ELSE 'GRANT'
      END
      + SPACE(1) + perm.permission_name + SPACE(1) + 'ON ' + QUOTENAME(OBJECT_SCHEMA_NAME(perm.major_id)) + '.' + QUOTENAME(OBJECT_NAME(perm.major_id)) --select, execute, etc on specific objects
      + CASE
            WHEN cl.column_id IS NULL THEN SPACE(0)
            ELSE '(' + QUOTENAME(cl.name) + ')'
        END
      + SPACE(1) + 'TO' + SPACE(1) + QUOTENAME(USER_NAME(usr.principal_id)) COLLATE database_default
      + CASE 
            WHEN perm.state <> 'W' THEN SPACE(0)
            ELSE SPACE(1) + 'WITH GRANT OPTION'
        END
         AS [-- SQL STATEMENTS --],
      7.2 AS [-- RESULT ORDER HOLDER --]
FROM   
   sys.database_permissions AS perm

   /* No join to sys.objects as it excludes system objects such as extended stored procedures */
   /*   INNER JOIN
   sys.objects AS obj
         ON perm.major_id = obj.[object_id]
   */
      INNER JOIN
   sys.database_principals AS usr
         ON perm.grantee_principal_id = usr.principal_id
      LEFT JOIN
   sys.columns AS cl
         ON cl.column_id = perm.minor_id AND cl.[object_id] = perm.major_id
  WHERE /* Include System objects when scripting permissions for master, exclude elsewhere */
      (    DB_NAME() <> 'master' AND perm.major_id IN (SELECT [object_id] FROM sys.objects WHERE type NOT IN ('S'))
        OR DB_NAME() =  'master'
        ) 
                      
      
         
--WHERE   usr.name = @OldUser
--ORDER BY perm.permission_name ASC, perm.state_desc ASC


UNION

/*********************************************/
/*********  TYPE LEVEL PERMISSIONS *********/
/*********************************************/
SELECT '-- [-- TYPE LEVEL PERMISSIONS --] --' AS [-- SQL STATEMENTS --],
        8 AS [-- RESULT ORDER HOLDER --]
UNION
SELECT  'IF DATABASE_PRINCIPAL_ID(' + QUOTENAME(USER_NAME(usr.principal_id),'''') COLLATE database_default + ') IS NOT NULL' + SPACE(1) +
      CASE 
            WHEN perm.state <> 'W' THEN perm.state_desc 
            ELSE 'GRANT'
        END
        + SPACE(1) + perm.permission_name + SPACE(1) + 'ON ' + QUOTENAME(SCHEMA_NAME(tp.schema_id)) + '.' + QUOTENAME(tp.name) --select, execute, etc on specific objects
        + SPACE(1) + 'TO' + SPACE(1) + QUOTENAME(USER_NAME(usr.principal_id)) COLLATE database_default
        + CASE 
                WHEN perm.state <> 'W' THEN SPACE(0)
                ELSE SPACE(1) + 'WITH GRANT OPTION'
          END
            AS [-- SQL STATEMENTS --],
        8.1 AS [-- RESULT ORDER HOLDER --]
FROM    
    sys.database_permissions AS perm
        INNER JOIN
    sys.types AS tp
            ON perm.major_id = tp.user_type_id
        INNER JOIN
    sys.database_principals AS usr
            ON perm.grantee_principal_id = usr.principal_id


UNION

SELECT '' AS [-- SQL STATEMENTS --],
   9 AS [-- RESULT ORDER HOLDER --]

UNION

/*********************************************/
/*********    DB LEVEL PERMISSIONS   *********/
/*********************************************/
SELECT '-- [--DB LEVEL PERMISSIONS --] --' AS [-- SQL STATEMENTS --],
      10 AS [-- RESULT ORDER HOLDER --]
UNION
SELECT   'IF DATABASE_PRINCIPAL_ID(' + QUOTENAME(USER_NAME(usr.principal_id),'''') COLLATE database_default + ') IS NOT NULL' + SPACE(1) +
      CASE 
         WHEN perm.state <> 'W' THEN perm.state_desc --W=Grant With Grant Option
         ELSE 'GRANT'
      END
   + SPACE(1) + perm.permission_name --CONNECT, etc
   + SPACE(1) + 'TO' + SPACE(1) + '[' + USER_NAME(usr.principal_id) + ']' COLLATE database_default --TO <user name>
   + CASE 
         WHEN perm.state <> 'W' THEN SPACE(0) 
         ELSE SPACE(1) + 'WITH GRANT OPTION' 
     END
      AS [-- SQL STATEMENTS --],
      10.1 AS [-- RESULT ORDER HOLDER --]
FROM   sys.database_permissions AS perm
   INNER JOIN
   sys.database_principals AS usr
   ON perm.grantee_principal_id = usr.principal_id
--WHERE   usr.name = @OldUser

WHERE   [perm].[major_id] = 0
   AND [usr].[principal_id] > 4 -- 0 to 4 are system users/schemas
   AND [usr].[type] IN ('G', 'S', 'U', 'R') -- S = SQL user, U = Windows user, G = Windows group

UNION

SELECT '' AS [-- SQL STATEMENTS --],
      11 AS [-- RESULT ORDER HOLDER --]

UNION 

SELECT '-- [--DB LEVEL SCHEMA PERMISSIONS --] --' AS [-- SQL STATEMENTS --],
      12 AS [-- RESULT ORDER HOLDER --]
UNION
SELECT   'IF DATABASE_PRINCIPAL_ID(' + QUOTENAME(USER_NAME(grantee_principal_id),'''') COLLATE database_default + ') IS NOT NULL' + SPACE(1) +
         CASE
         WHEN perm.state <> 'W' THEN perm.state_desc --W=Grant With Grant Option
         ELSE 'GRANT'
         END
            + SPACE(1) + perm.permission_name --CONNECT, etc
            + SPACE(1) + 'ON' + SPACE(1) + class_desc + '::' COLLATE database_default --TO <user name>
            + QUOTENAME(SCHEMA_NAME(major_id))
            + SPACE(1) + 'TO' + SPACE(1) + QUOTENAME(USER_NAME(grantee_principal_id)) COLLATE database_default
            + CASE
               WHEN perm.state <> 'W' THEN SPACE(0)
               ELSE SPACE(1) + 'WITH GRANT OPTION'
               END
         AS [-- SQL STATEMENTS --],
      12.1 AS [-- RESULT ORDER HOLDER --]
from sys.database_permissions AS perm
   inner join sys.schemas s
      on perm.major_id = s.schema_id
   inner join sys.database_principals dbprin
      on perm.grantee_principal_id = dbprin.principal_id
WHERE class = 3 --class 3 = schema

ORDER BY [-- RESULT ORDER HOLDER --]


OPEN tmp
FETCH NEXT FROM tmp INTO @sql, @sort
WHILE @@FETCH_STATUS = 0
BEGIN
        PRINT @sql
        FETCH NEXT FROM tmp INTO @sql, @sort    
END

CLOSE tmp
DEALLOCATE tmp 

IF OBJECT_ID('tempdb..##tbl_db_principals_statements') IS NOT NULL DROP TABLE ##tbl_db_principals_statements

Sample Output:

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