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TIP: Execute and investigate carefully this stored procedure (see Figure 5-2). Or even better, try to create it yourself. You will learn a lot from the problems that you encounter.

An xsd:group element allows you to define a set of xsd:elements that will later be referenced together. In the following example, the ExtendedPrice element has been defined as the group of Price, Currency, and Quantity elements:

Microsoft SQL Server supports an elaborate set of string functions. (Who would expect such a thing from a tool developed in C ;)) Basic String Manipulation

LEN(string_expression)

The LEN function uses the following syntax:

This function returns the length of a string in characters. The input parameter can be any kind of string expression. DATALENGTH, a similar system function, returns the number of bytes occupied by the value.

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A core feature of SQL Server is its ability to ensure that transactions follow the ACID properties. (ACID stands for atomicity, consistency, integrity, and durability.) Transactions must be atomic that is, all or nothing. If a transaction has been committed, it must be recoverable by SQL Server no matter what even if a total system failure occurs one millisecond after the commit was acknowledged. In SQL Server, if work was in progress and a system failure occurred before the transaction was committed, all the work is rolled back to the state that existed before the transaction began. Write-ahead logging makes it possible always to roll back work in progress or roll forward committed work that has not yet been applied to the data pages. Write-ahead logging ensures that a transaction s changes the before and after images of data are captured on disk in the transaction log before a transaction is acknowledged as committed. Writes to the transaction log are always synchronous that is, SQL Server must wait for them to complete. Writes to the data pages can be asynchronous, because all the effects can be reconstructed from the log if necessary. The transaction manager coordinates logging, recovery, and buffer management. These topics are discussed later in this chapter; at this point, we will just look at transactions themselves.

declare @chvEquipment varchar(30) set @chvEquipment = 'Toshiba Portege 7020CT' select Len(@chvEquipment)

5:

<xsd:element name="OrderItem"> <xsd:complexType> ... <xsd:group ref="ExtendedPrice"/> ... </xsd:complexType> </xsd:element> ... <xsd:group name="ExtendedPrice"> <xsd:sequence> <xsd:element name="Price" type="xsd:decimal"/> <xsd:element name="Currency" type="xsd:string"/> <xsd:element name="Quantity" type="xsd:decimal"/> </xsd:sequence> </xsd:group>

Figure 5-2.

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The following two functions return the number of characters from the left or right side of the string: LEFT(character_expression, integer_expression) RIGHT(character_expression, integer_expression) Earlier versions of Microsoft SQL Server contained only the RIGHT function.

declare @chvEquipment varchar(30) set @chvEquipment = 'Toshiba Portege 7020CT' select Left(@chvEquipment, 7) Make, Right(@chvEquipment, 14) Model

Before the introduction of the LEFT function, developers had to implement its functionality using the SUBSTRING function:

SUBSTRING(expression, start, length)

An attributeGroup element also allows you to define a group of attributes that can later be referenced together:

The SUBSTRING function takes a set (length) of characters from the string (expression) starting from a specified (start) character. The expression can be any character, text, image, or binary datatype. Because of this datatype flexibility, the length and start parameters are based on the number of bytes when the expression is of the text, image, binary, or varbinary datatypes, rather than on the number of characters. In the case of Unicode datatypes, one character occupies two bytes. If you specify an odd number, you may get unexpected results in the form of split characters. The following batch extracts part of a string:

declare @chvEquipment varchar(30) set @chvEquipment = 'Toshiba Portege 7020CT' select SUBSTRING(@chvEquipment, 9, 7)

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