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Update dbo.vInventory Set Cost = 2000 Where InventoryId = 1234
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SQL Server has to be able to identify rows and fields that clearly need to be modified. The view cannot contain derived columns (columns based on calculated values such as aggregate functions or expressions). If a view is created using With Check Option, SQL Server does not accept changes on records that will fall out of scope of the view after modification. For example, a manager who can see Inventory for his own location cannot assign it to some other location:
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CREATE VIEW vInventoryTrigonTower AS SELECT * FROM dbo.vInventory WHERE LocationId = 2 WITH CHECK OPTION GO update dbo.vInventoryTrigonTower set LocationId = 10 where InventoryId = 6
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SQL Server will generate an error:
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Server: Msg 550, Level 16, State 1, Line 1 The attempted insert or update failed because the target view either specifies WITH CHECK OPTION or spans a view that specifies
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WITH CHECK OPTION and one or more rows resulting from the operation did not qualify under the CHECK OPTION constraint. The statement has been terminated.
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With standard SQL views, it is not possible to modify data in more then a single base table. However, when an Instead-of trigger is placed on a view, the trigger can issue separate statements that modify individual base tables. See Triggers on Views, earlier in this chapter, for a detailed example and discussion of this method. It is very interesting and useful.
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Compared with stored procedures, views have one serious limitation they do not support parameters. Fortunately, you can use a table-valued user-defined function as a dynamic view, which do support parameters (you can also call them parameterized views):
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Create Function fnInventoryByLocationId( @LocationId int) Returns Table AS Return (SELECT * FROM dbo.vInventory WHERE LocationId = @LocationId)
They can be referenced in the From clause of a Select statement, which makes them work like a view:
select * from dbo.fnInventoryByLocationId (2)
INFORMATION_SCHEMA Views
SQL Server 2000 contains a group of system views that are used to obtain metadata. Their names consist of three parts. The first part is the database name (optional); the second part is always INFORMATION_SCHEMA (as opposed to being the database owner, which is why these views are so named); and the third part references the type of metadata that the view contains. In Figure 8-12, you can see the usage of an INFORMATION_SCHEMA.TABLES view. It returns the names of all tables (and views virtual tables) that the current user has permission to see in the current database. INFORMATION_SCHEMA
SQL Server 2000 Stored Procedure & XML Programming
Figure 8-12
Using INFORMATION_SCHEMA views
views work like system stored procedures they are defined in the master database, but they return information in the context of the current database (or the database that is referenced in the first part of the name). The INFORMATION_SCHEMA views are designed to be compatible with SQL-92 naming standards. Therefore, instead of database, owner, object, and user-defined data types INFORMATION_SCHEMA views are named with catalog, schema, object, and domain as a third parts of the name, respectively. Microsoft recommends that you reference these views (as well as system stored procedures) instead of directly referencing system tables in your procedures.
Indexed Views
It is possible to materialize a view to create a table in the database that will contain all the data that is referenced by a view. This technique can significantly improve the performance of a Select statement when SQL Server has to join many tables, and return or aggregate a large number of records. When you create a unique clustered index on a view, SQL Server materializes the view. Records are saved in the database in the same manner that clustered indexes on regular tables are stored:
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Create View vLaptopInventory WITH SCHEMABINDING as select i.Inventoryid, i.EquipmentId, i.StatusId, e.Make, e.Model from dbo.Inventory I inner join dbo.Equipment e on i.EquipmentId = e.EquipmentId where EqTypeId = 1 GO CREATE UNIQUE CLUSTERED INDEX idxvLaptopInventory ON vLaptopInventory (InventoryID)
Although the index references only a subset of columns, the index (indexed view) contains all columns in the leaf-level nodes (as does every clustered index).
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