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  • C++与MySQL的冲突

    当在C++代码中,直接引用MySQL文件时,可能会遇到如下错误

    In file included from /usr/include/c++/4.1.0/bits/char_traits.h:46,
                     from /usr/include/c++/4.1.0/string:46,
    /usr/include/c++/4.1.0/bits/stl_algobase.h:92:28: error: macro "swap" requires 3 arguments, but only 2 given
    /usr/include/c++/4.1.0/bits/stl_algobase.h:127:26: error: macro "swap" requires 3 arguments, but only 2 given

    /usr/include/c++/4.1.0/bits/vector.tcc:176:20: error: macro "swap" requires 3 arguments, but only 1 given
    /usr/include/c++/4.1.0/cctype:70: error: '::isalnum' has not been declared
    /usr/include/c++/4.1.0/cctype:71: error: '::isalpha' has not been declared
    /usr/include/c++/4.1.0/cctype:72: error: '::iscntrl' has not been declared
    /usr/include/c++/4.1.0/cctype:73: error: '::isdigit' has not been declared
    /usr/include/c++/4.1.0/cctype:74: error: '::isgraph' has not been declared
    /usr/include/c++/4.1.0/cctype:75: error: '::islower' has not been declared
    /usr/include/c++/4.1.0/cctype:76: error: '::isprint' has not been declared
    /usr/include/c++/4.1.0/cctype:77: error: '::ispunct' has not been declared
    /usr/include/c++/4.1.0/cctype:78: error: '::isspace' has not been declared
    /usr/include/c++/4.1.0/cctype:79: error: '::isupper' has not been declared
    /usr/include/c++/4.1.0/cctype:80: error: '::isxdigit' has not been declared
    /usr/include/c++/4.1.0/cctype:81: error: '::tolower' has not been declared
    /usr/include/c++/4.1.0/cctype:82: error: '::toupper' has not been declared

    解决办法:
    尽量对MySQL进行二次包装,让调用者看不到MySQL头文件,如在CPP中包含:
    #include <my_global.h>
    #include <my_sys.h>
    #include <mysql.h>


    在头文件中只进行引用声明:
    struct st_mysql;
    struct st_mysql_res;

    typedef long num_t;
    typedef char ** MYSQL_ROW;  /** return data as array of strings */


    不要在头文件直接include到MySQL的头文件,而且保证只在一个CPP文件中有对MySQL文件的include,否则你可能遇到很多莫名其妙的编译错误,如果不想到这一点,即使花一天时间也未必能找到错误原因。


    补充:
    MySQL4.x和MySQL5.x头文件不兼容的,最好使用5.x版本


    补充:
    有些版本只能引用#include <mysql.h>,包含其它会报C++标准库中某文件错误。

    原帖发在我的论坛:
    http://bbs.hadoopor.com/thread-1564-1-1.html
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  • 原文地址:https://www.cnblogs.com/aquester/p/9891864.html
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