ADDING FUNCTIONS AND COMMANDS TO MYSQL in Font

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CHAPTER 8 ADDING FUNCTIONS AND COMMANDS TO MYSQL
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Note To use UDFs on Linux, you must compile the server using dynamic libraries. Use the -withmysqld-ldflags=--rdynamic switch for the configure command before you compile.
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If you are using Windows, you also have to copy the udf_example Visual Studio project file and the udf_example.def file to the expert_udf directory. Rename these files to expert_udf.vcproj and expert_udf.def. Open the project file in Notepad (or WordPad) and replace the path- and filenames (e.g., udf_example with expert_udf). Some distributions of the MySQL source code have errors in the definition file. Listing 8-1 shows the correct contents of the expert_udf.def file. The best way to compile this file is to open the mysql.sln file from the root of the source code directory and add the expert_udf project to the solution. Open the project properties and be sure to verify that the include files are pointing to the appropriate locations. You can then compile the project and copy the expert_udf.dll file to the bin directory of your MySQL server installation. Listing 8-1. The expert_udf.def Source Code LIBRARY MYUDF DESCRIPTION 'MySQL Sample for UDF' VERSION 1.0 EXPORTS metaphon_init metaphon_deinit metaphon myfunc_double_init myfunc_double myfunc_int myfunc_int_init sequence_init sequence_deinit sequence avgcost_init avgcost_deinit avgcost_reset avgcost_add avgcost_clear avgcost
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Caution Windows users will have to remove the networking UDFs from the library. These are not supported directly on Windows. Comment out the functions if you encounter errors about missing header files or external functions.
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CHAPTER 8 ADDING FUNCTIONS AND COMMANDS TO MYSQL
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If you encounter errors during the compilation, go back and correct them. The most likely cause is a missed filename replacement or incorrect path. Now that the library is compiled, let s test the load and unload operations. This will ensure that the library has been properly compiled and is located in the correct location. Open a MySQL client window and issue the CREATE FUNCTION and DROP FUNCTION commands to load all of the functions in the library. Listing 8-2 shows the commands for loading and unloading the first five functions. The listing shows the commands for Windows; replace expert_udf.dll with expert_udf.so on Linux. Listing 8-2. Sample CREATE and DROP FUNCTION Commands CREATE CREATE CREATE CREATE CREATE DROP DROP DROP DROP DROP FUNCTION metaphon RETURNS STRING SONAME "expert_udf.dll"; FUNCTION myfunc_double RETURNS REAL SONAME "expert_udf.dll"; FUNCTION myfunc_int RETURNS INTEGER SONAME "expert_udf.dll"; FUNCTION sequence RETURNS INTEGER SONAME "expert_udf.dll"; AGGREGATE FUNCTION avgcost RETURNS REAL SONAME "expert_udf.dll"; metaphon; myfunc_double; myfunc_int; sequence; avgcost;
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FUNCTION FUNCTION FUNCTION FUNCTION FUNCTION
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Listings 8-3 and 8-4 show the correct results when you run the CREATE FUNCTION and DROP FUNCTION commands shown earlier. Listing 8-3. Installing the Functions mysql> CREATE FUNCTION metaphon RETURNS STRING SONAME "expert_udf.dll";
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Query OK, 0 rows affected (0.00 sec)
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mysql> CREATE FUNCTION myfunc_double RETURNS REAL SONAME "expert_udf.dll";
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Query OK, 0 rows affected (0.00 sec)
mysql> CREATE FUNCTION myfunc_int RETURNS INTEGER SONAME "expert_udf.dll";
Query OK, 0 rows affected (0.00 sec)
mysql> CREATE FUNCTION sequence RETURNS INTEGER SONAME "expert_udf.dll";
CHAPTER 8 ADDING FUNCTIONS AND COMMANDS TO MYSQL
Query OK, 0 rows affected (0.00 sec)
mysql> CREATE AGGREGATE FUNCTION avgcost RETURNS REAL SONAME "expert_udf.dll";
Query OK, 0 rows affected (0.00 sec)
Listing 8-4. Uninstalling the Functions mysql> DROP FUNCTION metaphon;
Query OK, 0 rows affected (0.00 sec)
mysql> DROP FUNCTION myfunc_double;
Query OK, 0 rows affected (0.00 sec)
mysql> DROP FUNCTION myfunc_int;
Query OK, 0 rows affected (0.00 sec)
mysql> DROP FUNCTION sequence;
Query OK, 0 rows affected (0.00 sec)
mysql> DROP FUNCTION avgcost;
Query OK, 0 rows affected (0.00 sec)
Now let s run the commands and see if they work. Go back to your MySQL client window and run the CREATE FUNCTION commands again to load the UDFs. Listing 8-5 shows sample execution of each of the first five UDFs in the library. Feel free to try out the commands as shown. Your results should be similar.
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