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Solutions based on this stored procedure are better than solutions based on the execution of a character string. The latter are not reused very often. It might happen that they will be reused only when parameter values also match. Even in a situation where we are changing the structure of a query, there are a finite number of possible combinations of query parameters (and some of them are more probable then others). Therefore, reuse will be much more frequent if you force parameterization using sp_executesql. When you use Execute, the complete batch has to be assembled in the form of a string each time. This requirement also takes time. If you are using sp_executesql, the batch will be assembled only the first time. All subsequent executions can use the same string and supply an additional set of parameters. Parameters that are passed to sp_executesql do not have to be converted to characters. That time is wasted when you are using Execute. By using them in their native format in sp_executesql, you may be able to detect errors more easily.

Basic Components 228 Construction of the Controller 228 Two Configurations 230 Controller Operation 231 Balloon Telemetry Project Parts List

SQL Server 7.0 and SQL Server 2000 documentation, Microsoft refers to them as scalar functions, meaning that they return just one value. Since you can still find references to global variables in some documentation, and since we would like to use some of them in this chapter, we will review them both here and in the next chapter, which is dedicated to functions. Global variable names begin with an @@ prefix. You do not need to declare them, since the server constantly maintains them. Let s review the principal global variables.

1234567890 DOC DOC 90198765432109 ISBN 0-07-211845-8

This is a function or global variable that you will use frequently. It is also a feature that generates many of the questions on Usenet newsgroups. One column in each table can be defined as the identity column, and the server will automatically generate a unique value in it. This is a standard technique in Microsoft SQL Server for generating surrogate keys (keys whose values are just numbers and do not carry any information). Usually, such columns will be set to assign sequential numbers:

Basic Components 238 Construction of the Interface 240 Installation 241 Connecting the Systems 243 R/C Digital Camera Control System Parts List

Create table Eq (EqId int identity(1,1), Make varchar(50), Model varchar(50), EqTypeId int)

Information has been obtained by Osborne/McGraw-Hill from sources believed to be reliable. However, because of the possibility of human or mechanical error by our sources, Osborne/McGraw-Hill, or others, Osborne/McGraw-Hill does not guarantee the accuracy, adequacy, or completeness of any information and is not responsible for any errors or omissions or the results obtained from use of such information.

The @@identity global variable will allow the user to find out which value was generated by the server. It is important to read the value as soon as possible (that is, in the next Transact-SQL statement). Otherwise, it might happen that you initiate, for example, another stored procedure or a trigger that inserts a record to a different table with an identity column. In such a case, SQL Server overwrites the number stored in @@identity with the new value. In the following example, a record will be inserted and a new identifier will immediately be read:

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Declare @intEqId int Insert into Eq(Make, Model, EqTypeId) Values ('ACME', 'Turbo', 2) Select @intEqId = @@identity

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Basic Components 274 Construction of the Data-Alert Board 278 Modem Module Board 278 Real-Time Clock Chip 281 Modem Module Operation 282 Setting up the Data-Alert 282 Uses for Data-Alert 290 Data-Alert (Main Board) Parts List 291 Modem Board (Daughter Board) Parts List 292

If one Transact-SQL statement inserts several records into a table with an identity column, @@identity will be set to the value from the last record:

Declare @intEqId int Insert into Equipment(Make, Model, EqTypeId) Select Make, Model, EqTypeID From NewEquipment Select @intEqId = @@identity

SQL is both a de facto and an official standard language for database management. What does it mean for SQL to be a standard What role does SQL play as a database language How did SQL become a standard, and what impact is the SQL standard having on personal computers, local area networks, minicomputers, and mainframes To answer these questions, this chapter traces the history of SQL and describes its current role in the computer market.