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Stored procedures are persistent database objects, and Microsoft SQL Server stores them in system tables to preserve them when their execution plan is removed from the procedure cache or while SQL Server is shut down. When the Create Procedure statement is executed, Microsoft SQL Server creates a new record in the sysobjects table of the current database (see Figure 3-2).
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This system table contains all types of database objects; it is sometimes useful to filter it by object type using the xtype field. The source code of the stored procedure is (usually) recorded in the syscomments system table. To see the source code, execute sp_helptext, or query the syscomments system table directly (see Figure 3-3). The source code is stored in a field named text. The datatype of this field is varchar(8000). Fortunately, this does not mean that stored procedures are limited to 8,000 characters. If the stored procedure is larger than 8,000 characters, SQL Server allocates additional records with an incremented colid field. Since this field is declared as smallint, a stored procedure can be 32K * 8,000 bytes 250MB long. In versions before SQL Server 2000 and SQL Server 7.0, colid was byte and text was varchar(255), so stored procedures were limited to 255 * 255 64KB.
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SQL Server 2000 Stored Procedure Programming
A developer can hide the source code for a stored procedure if he or she encrypts it during creation. After he or she creates the stored procedure With Encryption, none of the users (not even the system administrator) will be able to see it on the server. Keep in mind that you can (and should) keep source code in a separate external script file.
NOTE: Before this feature was introduced in SQL Server, developers achieved the same effect by setting the syscomments..text associated with the stored procedure to null. SQL Server was able to run the stored procedure without any problem. Unfortunately, this solution caused problems during upgrades from one version of SQL Server to another. Setup programs were expecting to use the text of the stored procedures to recompile them in the new environment. To solve that problem, Microsoft has included the With Encryption clause in the statement for creating a stored procedure. Setup programs will be able to upgrade stored procedures hidden in this manner.
MANAGING STORED PROCEDURES
SQL Server Enterprise Manager and Query Analyzer are the most important tools that the DBA will use to control the environment and manage stored procedures. We will review the ways that you can use Enterprise Manager and Query Analyzer to:
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List stored procedures View stored procedures Rename stored procedures Delete stored procedures View dependent and depending objects
Listing Stored Procedures
The easiest way to list stored procedures in a database is to view them from Enterprise Manager. All you need to do is follow these steps:
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1. Open Enterprise Manager. 2. Expand the server group (click +). 3. Expand the server. 4. Expand the database. 5. Click the Stored Procedures node in a tree; Enterprise Manager lists the stored procedures in the Details pane (see Figure 3-4). There are two ways to list stored procedures from Query Analyzer . We have shown how to use Object Browser in a previous chapter. The traditional way is based on Transact-SQL. SQL Server is delivered with the system stored procedure sp_stored_procedures. It lists stored procedures in the current database: 1. Open Query Analyzer.
Figure 3-4.
Listing stored procedures in Enterprise Manager
SQL Server 2000 Stored Procedure Programming
2. Switch the current database to Asset. 3. Set Query Analyzer to display results in a grid (Query | Results In Grid). 4. Type and execute sp_stored_procedures (Query | Execute). The program will show the list of stored procedures in the current database (see Figure 3-5). The stored procedure sp_stored_procedures retrieves a list of database objects from the sysobjects system table. If you want to see its contents, execute the following statement:
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