barcode generator vb.net free Consistent Implementation of Complex Business Rules and Constraints in Software

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Consistent Implementation of Complex Business Rules and Constraints
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Transact-SQL stored procedures are powerful enough to implement even the most complex business rules, because they combine both
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SQL Server 2000 Stored Procedure Programming
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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.
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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.
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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.
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Stored Procedure Design Concepts
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Reduced Network Traffic
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.
Faster Execution
Stored procedures have several performance advantages over ad hoc queries. Stored procedures are cached in a compiled form on the database server, so when they need to be used, the server does not have to parse and recompile them again. A developer can optimize a stored procedure s code so that every user will use the best possible method to perform an action.
Enforcement of Security
One sign of a well-designed database system is that it prevents users from directly accessing the tables and forces them to use stored procedures to perform specific functions. It is also easier to manage a set of stored procedures by functionality than to manage table- and column-level permissions.
SQL Server 2000 Stored Procedure Programming
SUMMARY
We have taken a detailed look at the world of stored procedures in this chapter. Stored procedures are database objects that encapsulate collections of Transact-SQL statements on the server for later repetitive use. As do their counterparts in other programming languages (functions and procedures), they support the use of input and output parameters and return values. Since the return value is limited to integer datatypes, parameters are mostly used to return success codes for the stored procedure. By placing Select statement(s) inside stored procedures, developers can return one (or more) resultset(s) from a stored procedure. To run a stored procedure, use the Execute statement. This statement must be supplied with a list of input and output parameters. Transact-SQL supports passing parameters by position and by name. We have described how batches and stored procedures are parsed, compiled, and executed in Microsoft SQL Server. This process is similar to compilation in standard programming languages. The end result is an execution plan that is cached in the procedure cache in the hope that somebody else will need it, that it will be reused, and that there will not be a need to parse and compile it again. Sometimes developers want to force compilation of a stored procedure. It is possible to force compilation during the creation of a stored procedure, during the execution of a stored procedure, or as needed (for example, when a new index is added to a table). Stored procedures are saved in system tables (sysobjects and syscomments) to allow SQL Server to manipulate them and to preserve them during shutdowns or when they are removed from the procedure cache. A developer can decide to protect his or her intellectual property and use encryption to hide a stored procedure s source code. Nobody (not even the system administrator) will be able to access this code, but SQL Server will have no problem with it, even during upgrades. The use of Transact-SQL statements for manipulation of stored procedures and other database objects might seem outdated
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