ERROR 1127（HY000）：在库中找不到符号'add'。 [英] ERROR 1127 (HY000): can't find symbol 'add ' in library.

问题描述

I have been looking for creating a user defined function in MariaDB to perform a simple task

< b>我尝试了什么：

What I have tried:

For that I created a sample c++ program for adding two numbers,and compiled using the below command
 g++ -fPIC -shared Hello.cc -o add.so
after that I copied the shared object file to plugin directory.

When Iam calling the Create function syntax 
 
CREATE FUNCTION add RETURNS integer SONAME 'add.so';

it gives the below error
 ERROR 1127 (HY000): Can't find symbol 'add ' in library.

Kindly give a solution for the same.

推荐答案

可能是由于 C ++ 函数名称修改。尝试用

Probably is due to C++ function name mangling. Try to surround function declaration with

extern "C" {
// your function declaration here...
}

例如，参见名称修改（仅限C ++） - IBM知识中心 [ ^ ]。

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