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If you make a typo in the name of the database object (for instance, in a table or column name), the situation is very different. Note that the name of the table in the following Insert statement is incorrect:

Insert into art (Make, Model, Type) Values ('Toshiba', 'Portege 7020CT', 'Notebook') Select * from Part

In this example, the application will notice an error and stop execution as soon as it encounters it:

Server: Msg 208, Level 16, State 1, Line 1 Invalid object name 'art'.

1 2 0 8

SQL Server executes the batch in three steps: it parses, compiles, then executes. In the first phase, SQL Server verifies batch syntax. It focuses on the sequence of keywords, operators, and identifiers. The first batch used a statement with a typo in a keyword. SQL Server picked up the error during the parsing phase. The error in the second batch (an invalid object name) was picked up during execution. To further demonstrate this fact, let s investigate the following example, where the error is in the second statement:

Insert into Part (Make, Model, Type) Values ('Toshiba', 'Portege 7020CT', 'Notebook') Select * from art

In this case, the application behaves differently:

(1 row(s) affected) Server: Msg 208, Level 16, State 1, Line 1 Invalid object name 'art'.

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Both commands are parsed and compiled, then the first command is executed, and finally the second command is canceled. Users with experience on earlier versions of Microsoft SQL Server will remember that such a scenario would produce very different results in those earlier versions. Microsoft SQL Server versions 2000 and 7.0 have a feature called deferred name resolution. It allows the server to compile Transact-SQL statements even when underlying objects do not yet exist in the database. This feature can prove to be very useful when you are transferring objects from one database or server to another. You do not have to worry about dependencies and the order in which objects are created. Unfortunately, the introduction of this feature also has some strange secondary effects. In the case of the last example:

Attribute-centric mapping Element-centric mapping Default equivalent to XML_ATTRIBUTES (1) Overflow metaproperty of the document (@mp:xmltext) should contain only nodes that were not extracted using the OpenXML() rowset provider

6:

The server has successfully compiled a batch, since the name resolution is not part of the compilation. The first command was executed without a problem. When a problem was encountered in the second command, the server canceled all further processing and returned a runtime error.

2:

Keep this problem in mind when writing batches. Developers in modern programming languages like Visual Basic or Visual C++ usually employ sophisticated error-handling strategies to avoid situations like this. Transact-SQL also contains programming constructs for error handling. We will explore them in the next chapter. The situation could be worse. Particular runtime errors (for example, constraint violations) do not stop execution of the batch. In the following case, we attempt to use an Insert statement to insert a value in the identity column.

NOTE: Identity columns are a feature used by SQL Server to generate unique, sequential numbers for each record inserted in a table. It is equivalent to the AutoNumber datatype in Microsoft Access. Naturally, you should not attempt to specify values in such columns.

Select PartId, Make + ' ' + Model Part from Part Insert into Part (PartId, Make, Model, Type) Values (1, 'IBM', 'Thinkpad 390D', 'Notebook') Select PartId, Make + ' ' + Model Part from Part Go

The result is a partial failure :

Values of the flags Parameter of OpenXML()

PartId 1 Part Toshiba Portege 7020CT ----------- --------------------------------------------------

(1 row(s) affected)

Server: Msg 544, Level 16, State 1, Line 1 Cannot insert explicit value for identity column in table 'Part' when IDENTITY_INSERT is set to OFF. PartId 1 Part Toshiba Portege 7020CT ----------- ----------------------------------

(1 row(s) affected)

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