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Granting Database Access
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As we have shown, database access can be granted to a login during the login s creation. There is also a way to grant access to additional databases after the login has been created. Database users can be
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Interaction with the SQL Server Environment
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managed from the Users node of a database in Enterprise Manager. You can both manage existing users and create new users. Login names have to be selected from the list box. The User Name is set by default to the name of the login. This default is not required, but it simplifies user management. In the Database Role Membership section, you check all databases to which you want to grant the user membership:
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You can perform the same operation from Transact-SQL. To grant access to the database, use sp_grantdbaccess:
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exec sp_grantdbaccess 'TomB', 'TomB'
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You can review access using sp_helpusers and revoked using sp_revokedbaccess. To assign a user to a user-defined database role, you issue a command such as
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exec sp_addrolemember 'TomB', 'Management'
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SQL Server 2000 Stored Procedure Programming
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You can review membership using sp_helprolemember and revoke it using sp_droprolemember. You can create roles using sp_addrole:
exec sp_addrole 'Management'
You can remove roles using sp_droprole. To view a list of roles, use sp_helpfixeddbroles and sp_helproles.
Assigning Permissions
The system of permissions controls user and role access to database objects and statements. Permissions can exist in one of following three states:
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Granted Denied Revoked
Granted means that a user has permission to use an object or statement. Denied means that a user is not allowed to use a statement or object, even if the user has previously inherited permission (that is, he is member of a role that has permission granted). Physically, a record is stored in the sysprotects table for each user (or role) and object (or statement) for which permission has been granted or denied. When a permission is Revoked, records that were stored for that security account (that is, the records granting or revoking permissions) are removed from the sysprotects table. Because of their physical implementation, permissions are cumulative. For example, a user can receive some permissions from one role and missing permissions from some other role. Or, the user can lose some permissions that have been granted to all other members of a role. You can control statement permissions from the Permissions tab of a database s Properties dialog. You can set object permissions using the Permissions button in a database object s Properties dialog. In both cases, you see a list of users and roles:
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An administrator can grant ( ), deny ( ), or revoke ( ) permissions. Grant Statement To grant statement permission, an administrator can issue a Grant statement with the following syntax:
Grant {ALL | statement_name_1 [, statement_name_2, statement_name_n] } To account_1[, account_2, account_n]
To grant object permission, an administrator can issue a Grant statement with the following syntax:
Grant {All [Privileges]| permission_1[,permission_2, permission_n]} { [column_1, column_2, column_n] ON {table | view } | On {table | view } [column_1, column_2, column_n] | On {stored_procedure } } To account_1[, account_2, account_n] [With Grant Option] As {group | role}
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The following statement allows JohnS (SQL Server login) and TomB from the Accounting domain (Windows domain user) to create a table in the current database:
Grant Create Table To JohnS, [Accounting\TomB]
The following statement allows members of the AssetOwners role to view, store, delete, and change records in the Inventory table:
Grant Select, Insert, Update, Delete On Inventory To AssetOwners
Deny Statement The Deny statement is used to negate permissions. Its syntax is basically the same as the syntax of the Grant statement (except that the keyword Deny is used). The following statement prevents TomB from the Accounting domain from creating a database:
Deny Create Database To [Accounting\TomB]
The following statement prevents JohnS from deleting and changing records from the Inventory table, even though he has inherited rights to view, store, delete, and change records as a member of the AssetOwners role:
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