10: Interaction with the SQL Server Environment in .NET

Creator Data Matrix 2d barcode in .NET 10: Interaction with the SQL Server Environment

10: Interaction with the SQL Server Environment
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select 'EXEC sp_addsrvrolemember from syslogins where sysadmin = 1 union select 'EXEC sp_addsrvrolemember from syslogins where securityadmin = 1 union select 'EXEC sp_addsrvrolemember from syslogins where serveradmin = 1 union select 'EXEC sp_addsrvrolemember from syslogins where setupadmin = 1 union select 'EXEC sp_addsrvrolemember from syslogins where processadmin = 1 union select 'EXEC sp_addsrvrolemember from syslogins where diskadmin = 1 union select 'EXEC sp_addsrvrolemember from syslogins where dbcreator = 1 union select 'EXEC sp_addsrvrolemember from syslogins where bulkadmin = 1
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'''+loginname+''', ''sysadmin'''
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'''+loginname+''', ''securityadmin'''
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'''+loginname+''', ''serveradmin'''
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'''+loginname+''', ''setupadmin'''
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'''+loginname+''', ''processadmin'''
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'''+loginname+''', ''diskadmin'''
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'''+loginname+''', ''bulkadmin'''
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----------------------------------------select 'Run these after dbs are created:' select ' EXEC sp_defaultdb @loginame = ''' + loginname + '''' ,', @defdb = ''' + Coalesce(dbname, 'tempdb') + '''' FROM syslogins where name NOT IN ('sa') AND isntname = 0 ----------------------------------------
select ' EXEC sp_defaultdb @loginame = ''' + loginname + ''''
SQL Server 2000 Stored Procedure & XML Programming
,', @defdb = ''' + Coalesce(dbname, 'tempdb') + '''' FROM syslogins WHERE loginname NOT IN ('BUILTIN\Administrators') AND isntname = 1
When executed on the source server, the script generates one group of commands to be executed before deployment, and one group to be executed after the databases are deployed on the target server. The first group re-creates logins, preserves their IDs and passwords, and then renews their membership in server roles. The second group sets their default databases. SQL Server also offers the sp_change_users_login procedure. You can use it to display the mapping between the user and login:
exec sp_change_users_login @Action = 'Report'
Note that using sp_change_users_login with @Action='Report' does not accept parameters for user or login names. You can set a login manually for a single user:
exec sp_change_users_login @Action = 'Update_one', @UserNamePattern = 'TomB', @LoginName = 'TomB'
SQL Server can also match database users to logins with the same name:
exec sp_change_users_login @Action = 'Auto_Fix', @UserNamePattern = '%'
For each user, SQL Server tries to find a login with the same name and to set the login ID.
sp_change_users_login with 'Auto_Fix' does a decent job, but the cautious DBA should inspect the results of this operation.
Managing Application Security Using Stored Procedures, User-Defined Functions, and Views
When permissions are granted on complex objects like stored procedures, userdefined functions, or views, the user does not need to have permissions on the
10: Interaction with the SQL Server Environment
underlying objects within or referenced by it. This characteristic is illustrated in the following example:
Create Database Test Go sp_addlogin @loginame = 'AnnS', @passwd = 'password', @defdb = 'test' GO Use Test Exec sp_grantdbaccess @loginame = 'AnnS', @name_in_db = 'AnnS' Go Create Table aTable( Id int identity(1,1), Description Varchar(20) ) Go Create Procedure ListATable as Select * from aTable go Create Procedure InsertATable @Desc varchar(20) as Insert Into aTable (Description) Values (@Desc) Go Deny Select, Insert, Update, Delete On Atable To Public Grant Execute On InsertATable To Public Grant Execute On ListATable
SQL Server 2000 Stored Procedure & XML Programming
To Public Go
A table is created along with two stored procedures for viewing and inserting records into it. All database users are prevented from using the table directly but are granted permission to use the stored procedures.
NOTE
All database users are automatically members of the Public role. Whatever permissions are granted or denied to the Public role are automatically granted or denied to all database users.
After this script is executed, you can log in as AnnS in Query Analyzer and try to access the table both directly and through stored procedures. Figure 10-3 illustrates such attempts. There are two exceptions to the rule I have just described: If the owner of the stored procedure is not the owner of the database objects by the stored procedure, SQL Server will check the object s permissions on each underlying database object. Usually, this is not an issue because all objects should be owned by the dbo user. If you are executing a character string batch in a stored procedure, you still need to set permissions on all underlying objects. Stored procedures, user-defined functions, and views are important tools for implementing sophisticated security solutions in a database. Each user should have permissions to perform activities tied to the business functions for which he or she is responsible and to view only related information. It is also easier to manage security in a database on a functional level than on the data level. Therefore, client applications should not be able to issue ad hoc queries against tables in a database. Instead, they should execute stored procedures. Users should be grouped in roles by the functionality they require, and roles should be granted execute permissions to related stored procedures. Since roles are stored only in the current database, using them helps you avoid problems that occur during the transfer of the database from the development to the production environment.
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