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SQL Server 2000 Stored Procedure Programming
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the name of the project. Extended stored procedure names commonly begin with the xp_ prefix. 2. Select Extended Stored Proc AppWizard from the list of project types:
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3. When you click OK, the program will launch the Extended Stored Proc Wizard. It prompts you to name your extended stored procedure:
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4. Click Finish. The wizard generates the following project files:
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Special Types of Procedures
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proc.cpp The exported Win32 function, which is the extended stored procedure [projname].dsp The Visual C++ project file [projname].cpp A file that includes DLL initialization code StdAfx.h An include file for standard system include files, or project-specific include files that are used frequently StdAfx.cpp includes A source file that includes just the standard
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5. Open proc.cpp and change the code to implement features of the extended stored procedure. Figure 9-2 shows Visual Studio with the code of the extended stored procedure.
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Figure 9-2.
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Code of the extended stored procedure
SQL Server 2000 Stored Procedure Programming
6. Compile the generated project to generate a DLL [projname].DLL. Let s review the code. The following code listing shows the contents of proc.cpp. It contains the exported Win32 function xp_hello. The function was generated by the wizard, and it returns a simple message and a recordset that contains three records:
#include <stdafx.h> #define XP_NOERROR #define XP_ERROR #define MAXCOLNAME #define MAXNAME #define MAXTEXT #ifdef __cplusplus extern "C" { #endif RETCODE __declspec(dllexport) xp_hello(SRV_PROC *srvproc); #ifdef __cplusplus } #endif RETCODE __declspec(dllexport) xp_hello(SRV_PROC *srvproc) { DBSMALLINT i = 0; DBCHAR colname[MAXCOLNAME]; DBCHAR spName[MAXNAME]; DBCHAR spText[MAXTEXT]; // Name of this procedure wsprintf(spName, "xp_hello"); 0 1 25 25 255
//Send a text message
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Special Types of Procedures
wsprintf(spText, "%s Sample Extended Stored Procedure", spName); srv_sendmsg( srvproc, SRV_MSG_INFO, 0, (DBTINYINT)0, (DBTINYINT)0, NULL, 0, 0, spText, SRV_NULLTERM);
//Set up the column names wsprintf(colname, "ID"); srv_describe(srvproc, 1, colname, SRV_NULLTERM, SRVINT2, sizeof(DBSMALLINT), SRVINT2, sizeof(DBSMALLINT), 0); wsprintf(colname, "spName"); srv_describe(srvproc, 2, colname, SRV_NULLTERM, SRVCHAR, MAXNAME, SRVCHAR, 0, NULL); wsprintf(colname, "Text"); srv_describe(srvproc, 3, colname, SRV_NULLTERM, SRVCHAR, MAXTEXT, SRVCHAR, 0, NULL);
// Update field 2 "spName", same value for all rows srv_setcoldata(srvproc, 2, spName); srv_setcollen(srvproc, 2, strlen(spName));
// Send multiple rows of data for (i = 0; i < 3; i++) { // Update field 1 "ID" srv_setcoldata(srvproc, 1, &i);
SQL Server 2000 Stored Procedure Programming
// Update field 3 "Text" wsprintf(spText, "%d) Sample rowset generated by the %s extended stored procedure", i, spName); srv_setcoldata(srvproc, 3, spText); srv_setcollen(srvproc, 3, strlen(spText)); // Send the entire row srv_sendrow(srvproc); }
// Now return the number of rows processed srv_senddone(srvproc, SRV_DONE_MORE | SRV_DONE_COUNT, (DBUSMALLINT)0, (DBINT)i); return XP_NOERROR ; }
Registering the Extended Stored Procedure
Once the DLL is compiled, the extended stored procedure has to be registered on the server before it can be used: 1. Copy the XP_HELLO.dll file to the SQL Server \ \Binn folder. 2. Register the new extended stored procedure using the SQL Server Enterprise Manager, or by executing the following SQL command:
sp_addextendedproc 'xp_hello', 'XP_HELLO.DLL'
Once the extended stored procedure is registered, you can test it using Query Analyzer (see Figure 9-3).
9:
Special Types of Procedures
Figure 9-3.
Using the extended stored procedure
You should carefully test the new extended stored procedure. If you find out that it is not working as expected or that you need to make some modification, you will need to unregister (drop) the extended stored procedure by using the following SQL command:
sp_dropextendedproc 'xp_hello'
When the extended stored procedure is executed in SQL Server, it is loaded into memory. It stays there until SQL Server is shut down or until you issue a command to remove it from memory:
DBCC xp_hello(FREE)
SQL Server 2000 Stored Procedure Programming
To register an extended stored procedure from Enterprise Manager, you need to right-click the Extended Stored Procedures node in the master database and select New Extended Stored Procedure. Enterprise Manager prompts you for the name of the extended stored procedure and the location of the .dll file:
It is also simple to remove an extended stored procedure using Enterprise Manager. You merely right-click it and select Delete from the pop-up menu.
NOTE: The trouble with extended stored procedures is that they work in the address space of SQL Server. Therefore, an extended stored procedure that doesn t behave properly could crash SQL Server. Such a problem is not likely to occur, since SQL Server monitors the behavior of extended stored procedures. If an extended stored procedure, attempts to reference memory outside of its address space, for example, SQL Server will terminate it. Common sense programming practices (using error checking, doing exception handling, and thoroughly testing final code) will further reduce the possibility of errors.
TIP: There is another problem. If you are fluent enough in the techniques required to create extended stored procedures, you should not be spending your time creating business applications. You should be working on more fundamental stuff like operating systems or RDBMS, and devoting your time to hacking. Let the rest of us collect the easy money.;)
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