Windows上的MySQL UDF开发

曾以为Windows版本的MySQL存在不能使用UDF的BUG诸提交了一个bug报告。不过
似乎发现是我搞错了，MySQL的技术支持人员给了非常完美的解答，同大家分享
一下。下边是原文回复 :)

Sorry this isn''t a bug.
Below I pasted a sample I did sometime ago for another user:

Ok. Assuming you have VC++ and the source distribution and a server
running,
I will create a UDF that returns a name:

Note: the sample is ugly, but the purpose here is to show you how
to handle the UDF.

- Open the mysqld.dsw workspace.
- Add New PRoject to the workspace
- Project name: my_udf
- Select Win32 Dynamic-Link Library
- Click OK
- Select An Empty DLL project
- Click Finish
- Click OK
- Add a new file called my_udf.cpp to the project:

#include <stdlib.h>
#include <winsock.h>
#include <mysql.h>

extern "C" {
char *my_name(UDF_INIT *initid, UDF_ARGS *args, char *is_null,
       char *error);
}

char *my_name(UDF_INIT *initid, UDF_ARGS *args, char *is_null,
       char *error)
{
    char * me = "my name";

    return me;
}

- Type Ctrl+N for to create a new file.
- Select text type
- File name: my_udf.def
- Edit the above file with the below contents:
LIBRARY         UDF_EXAMPLE
DESCRipTION             ''Example Using UDF with VC++''
VERSION         1.0
EXPORTS
        my_name

- Right Click the my_udf project and select Settings
- Click the C/C++ tab
- Select General in the Category Combo
- Add the macro HAVE_DLOPEN to the PreProcessor definition
- Select Preprocessor in the Category Combo
- Add the include path to the text box: Additional Include directories
  e.g: ../include
- Press F7 for to build the DLL.

- Copy the my_udf.dll to the environment path directory:
  \winnt\system32 for example.

- Start the mysql client and issue:

C:\mysql-udf\bin>mysql -uroot -p
Ente

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