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C/C++ code:

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MYSQL* mysql£»

MYSQL_RES* res;

//ÎÒÏëʵÏÖÒ»¸ö²é¿´ÓÐûÓÐ mysql½á¹¹£¬Èç¹ûûÓоÍÁ¬½Ó¡£

void connect()
{
mysql_init(mysql);
mysql_realconnect(....);
}


function a ()
{
if(mysql==??)
connect();
else
dosomequery();
}

function b()
{
if(mysql==??)
connect();
else
dosomeotherquery();

}
int main()
{
...
}




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function a ()
{
    if(connect()!=null)
   
    else
      dosomequery();
}



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Õâ¸öÊÇʲôÒâ˼£¬unsigned int c:2, d:1;

struct s1 {
char ch, *ptr;
union {
short a, b;
unsigned int c:2, d:1;
}
struct s1 *next;
};


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