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The trouble with this kind of solution is that most of the time, most of the text-boxes will be left empty. This does not mean that the user wants to find only those records in which the values of these fields are set to empty strings, but that those fields that the user leaves blank should not be included in the criteria. Stored procedures have a static structure, but something dynamic would be more appropriate to launch this kind of query. The following stored procedure assembles a character-string query. The contents of the Where clause are based on the criteria that were specified (that is, fields that were not set to null). When all components are merged, the query returns a list of matching contacts:

Create Procedure prQbfContact_1 -- Dynamically assemble a query based on specified parameters. ( @chvFirstName @chvLastName @chvPhone @chvFax @chvEmail @insOrgUnitId @chvUserName @debug ) varchar(30) varchar(30) typPhone typPhone typEmail smallint varchar(50) int = NULL, = NULL, = NULL, = NULL, = NULL, = NULL, = NULL, = 0

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As set nocount on Declare @intErrorCode int, @intTransactionCountOnEntry int, @chvQuery varchar(8000), @chvWhere varchar(8000) Select @intErrorCode = @@Error, @chvQuery = 'SET QUOTED_IDENTIFIER OFF SELECT * FROM Contact', @chvWhere = '' If @intErrorCode = 0 and @chvFirstName is not null Begin Set @chvWhere = @chvWhere + ' FirstName = "' + @chvFirstName + '" AND' Select @intErrorCode = @@Error End If @intErrorCode = 0 and @chvLastName is not null Begin Set @chvWhere = @chvWhere + ' LastName = "' + @chvLastName + '" AND' Select @intErrorCode = @@Error End If @intErrorCode = 0 and @chvPhone is not null Begin set @chvWhere = @chvWhere + ' Phone = "' + @chvPhone + '" AND' Select @intErrorCode = @@Error End If @intErrorCode = 0 and @chvFax is not null Begin set @chvWhere = @chvWhere + ' Fax = "' + @chvFax + '" AND' Select @intErrorCode = @@Error End If @intErrorCode = 0 and @chvEmail is not null Begin set @chvWhere = @chvWhere + ' Email = "' + @chvEmail + '" AND' Select @intErrorCode = @@Error End

Transact-SQL stored procedures are powerful enough to implement even the most complex business rules, because they combine both

procedural and nonprocedural approaches. Everything that is too complicated to be implemented using other constraints and that is procedural and not just relational can be implemented in the form of a stored procedure. This is a serious topic. We will expand on it in coming chapters.

1. Create the Asset database project in Visual Studio .NET. 2. Open Solution Explorer. 3. Make sure that the Asset database is one of the Database References. If the

Stored procedures allow developers to encapsulate business functionality and provide users (mostly other programs not end users) with a simple interface. Stored procedures behave like a black box. The user does not have to know how they are implemented, just what they do, what input is required, and what output will be generated. Humans are limited as to the amount of information that they can process, and stored procedures are a perfect way to reduce the complexity of the design process.

System design is a cyclic process. Every system needs to be reviewed, changed, and improved. By hiding database structure details behind stored procedures, database administrators can reduce the need to change all other components (that is, client applications and middleware components) of the system whenever they change the database structure. Microsoft does the same thing with system stored procedures and system tables. Although DBAs can use the contents of system tables directly in their applications, they should base their code on system stored procedures, because Microsoft reserves the right to change tables from version to version but has promised to keep the interface and functionality of stored procedures intact. Another advantage is that stored procedures are implemented on the server and can be maintained centrally. If the business logic is implemented in the client application, a huge effort will be needed to deploy changes.

3:

One of the major disadvantages of file-server architecture is high network traffic due to the fact that entire files are being transferred across the network. If a client/server system is well designed, the client will receive just the information it needs, which is usually just a slight portion of the database, thus significantly reducing the network traffic. If a client/server system is implemented with even more of the processing/business logic on the server (that is, using stored procedures), even less data will be transferred back and forth through the network.

NOTE: Naturally, stored procedures are not the only way to implement business logic on the server. Three-tier architecture envisions implementation of business services on a middleware server.

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