SQL Server 2000 Stored Procedure & XML Programming in VS .NET

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SQL Server 2000 Stored Procedure & XML Programming
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Server 7.0 or the SQL Server ODBC Driver from SQL Server version 7.0. If stored values are longer then 4000 characters, SQL Server will return just the first 4000 characters. sql_variant values are automatically converted to varchar(255) when accessed from client applications using the SQL Server ODBC Driver from SQL Server version 6.5 or earlier, or using DB-Library. If stored values are longer than 255 characters, SQL Server will return just the first 255 characters. sql_variant columns are not supported in the Like predicate. sql_variant columns do not support full-text indexes. sql_variant objects cannot be concatenated using the + operator, even if the stored values are strings or numeric. The proper solution is to convert values before concatenation. Some functions Avg(), Identity(), IsNumeric(), Power(), Radians(), Round(), Sign(), StDev() StDevP(), Sum(),Var(), VarP() do not support sql_variant parameters.
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You should be very conservative in using the sql_variant data type. Its use has serious performance and design implications.
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The table data type is used to store a recordset for later processing. In some ways, this data type is similar to a temporary table. You cannot use this type to define a column. It can only be used as a local variable to return the value of a function.
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You will find more information about table variables in the Table Variables section later in this chapter, and information about functions in s 5 and 8.
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The Cursor Data Type
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This is a special kind of data type that contains references to cursors. You will see in the Cursors section later in this chapter that cursors are programming constructs that are designed to allow operations on records one at a time. It is not possible to define a column of this type. It can be used only for variables and stored procedure output values.
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You can define custom data types in the database. These new types are based on system-defined data types and are accessible only in the database in which they are
C h a p t e r 4 : B a s i c Tr a n s a c t - S Q L P r o g r a m m i n g C o n s t r u c t s
defined. You can define them from Enterprise Manager, or using the system stored procedure sp_addtype:
Exec sp_addtype Phone, varchar(20), 'NOT NULL' Exec sp_addtype typPostalCode, varchar(7), 'NULL'
The first parameter is the name of the new data type, the second parameter is the system-defined data type on which it is based, and the third parameter defines the nullability of the new data type. When the command is executed, the server adds the type to the systype table of the current database. New types can be based on any system-defined type except timestamp.
A fascinating aspect of user-defined data types is that you can change them in one step across the database. For example, if you decide that decimal(19,6) is not big enough for you monetary values, you can replace it with decimal(28,13). You can simply run the script that first changed the data type and then re-create all database objects that are referencing it. This feature is very useful during the development stage of a database. Unfortunately, when a database is already in the production phase, tables contain data, and this feature becomes a lot more complicated.
The designers of Microsoft SQL Server have included one special data type with the server sysname. It is used to control the length of Transact-SQL identifiers. When the server is working in default mode, the length of this type is set to 128 characters. When the compatibility level is set to 65 or 60, the length is shortened to 30 characters. You should use it to define columns and variables that will contain Transact-SQL identifiers.
Variables
Variables in Transact-SQL are the equivalent of variables in other programming languages, but due to the nature of the Transact-SQL language, their use and behavior are somewhat different. There are two types of variables in Transact-SQL: Local variables Global variables
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