The script file bldcset, in sqllib/samples/cpp, contains the commands to build a sample C++ program.
The first parameter, $1, specifies the name of your source file. The second parameter, $2, specifies the name of the database to which you want to connect. Parameter $3 specifies the user ID for the database, and $4 specifies the password. Only the first parameter, the source file name, is required. Database name, user ID, and password are optional. If no database name is supplied, the program uses the default sample database.
#! /bin/ksh # bldcset script file # Build sample C++ program that contains embedded SQL. # Usage: bldcset <prog_name> [ <db_name> [ <userid> <password> ]] # Connect to a database. if (($# < 2)) then db2 connect to sample elif (($# < 3)) then db2 connect to $2 else db2 connect to $2 user $3 using $4 fi # Precompile the program. db2 prep $1.sqC bindfile # Bind the program to the database. db2 bind $1.bnd # Disconnect from the database. db2 connect reset # Compile the util.c error-checking utility. xlC -I/usr/lpp/db2_05_00/include -c util.C # Compile the program. xlC -I/usr/lpp/db2_05_00/include -c $1.C # Link the program. xlC -o $1 $1.o util.o -ldb2 -L/usr/lpp/db2_05_00/lib |
| Compile and Link Options for bldcset |
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The script file contains the following compile options:
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The script file contains the following link options:
Refer to your compiler documentation for additional compiler options.
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To build the sample program updat.sqC, do the following:
db2start
bldcset updat
The result is an executable file updat. You can run the executable file against the SAMPLE database to see how it works by doing the following:
db2start
updat
The script file bldcsetsrv, in sqllib/samples/cpp, contains the commands to build a stored procedure. The script file compiles the stored procedure into a shared library that can be called by a client application.
The first parameter, $1, specifies the name of your source file. The second parameter, $2, specifies the name of the database to which you want to connect. Parameter $3 specifies the user ID for the database, and $4 specifies the password. Only the first parameter, the source file name, is required. Database name, user ID, and password are optional. If no database name is supplied, the program uses the default sample database.
The script file uses the source file name, $1, for the shared library name, and for the main entry point to the shared library.
#! /bin/ksh
# bldcsetsrv script file
# Builds a C++ stored procedure.
# Usage: bldcsetsrv <stor_proc_name> [ <db_name> [ <userid> <password> ]]
# Connect to a database.
if (($# < 2))
then
db2 connect to sample
elif (($# < 3))
then
db2 connect to $2
else
db2 connect to $2 user $3 using $4
fi
# Precompile the program.
db2 prep $1.sqC bindfile
# Bind the program to the database.
db2 bind $1.bnd
# Disconnect from the database.
db2 connect reset
# Compile the util.c error-checking utility.
xlC -I/usr/lpp/db2_05_00/include -c util.c
# Compile the program.
xlC -I/usr/lpp/db2_05_00/include -c $1.C
# Link the program using the export file $1.exp,
# creating a shared library called $1 with the main
# entry point $1.
makeC++SharedLib -p 1024 -o $1 $1.o util.o -ldb2 -L/usr/lpp/db2_05_00/lib \
-H512 -T512 -bE:$1.exp -e $1
# Copy the shared library to the sqllib/function subdirectory of the DB2 instance.
# Note: this assumes the user has write permission to this directory.
eval "H=~$DB2INSTANCE"
cp $1 $H/sqllib/function
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| Compile and Link Options for bldcsetsrv |
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The script file contains the following compile options:
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The script file contains the following link options:
Refer to your compiler documentation for additional compiler options.
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To build the outsrv stored procedure, do the following:
db2start
bldcsetsrv outsrv
The script file copies the stored procedure to the server in the path sqllib/function to indicate that the stored procedure is fenced. If you want the stored procedure to be unfenced, you must move it to the sqllib/function/unfenced directory. These paths are in the home directory of the DB2 instance.
| Note: | An unfenced stored procedure or UDF runs in the same address space as the database manager and results in increased performance when compared to a fenced stored procedure or UDF, which runs in an address space isolated from the database manager. With unfenced stored procedures or UDFs there is a danger that user code could accidentally or maliciously damage the database control structures. Therefore, you should only run unfenced stored procedures or UDFs when you need to maximize the performance benefits. Ensure these programs are thoroughly tested before running them as unfenced. Refer to the Embedded SQL Programming Guide for more information about fenced and not fenced stored procedures. |
Once you build the stored procedure outsrv, you can build the client application outcli that calls the stored procedure. First, copy the C source file outcli.sqc to outcli.sqC so that it has the C++ file extension .sqC. Then you can build outcli using the bldcset script file. Refer to "IBM C Set++" for details.
To run the stored procedure, do the following:
db2start
outcli remote_database userid password
where
The client application passes a variable to the server program outsrv, which gives it a value and then returns the variable to the client application.
Multi-threaded applications on AIX Version 4 need to be compiled and linked with the xlC_r compiler instead of the xlC compiler.