Linux下C语言处理MySQL数据库示例程序

Linux下C语言处理MySQL数据库示例程序

Linux下C语言处理MySQL数据库示例程序，花了n久的时间终于搞清楚了，丫丫的，真麻烦

编译：

引用

g++ -Imysql/include -Lmysql/lib -o a.out a.cpp -lmysqlclient -lz

这个mysql目录是某个mysql的源码目录，如果有安装mysql-devel可能是在/usr/ooxx/mysql，没有的话自己去down源码

#include<iostream>

#include<string>

#include<fstream>

#include"mysql.h"

using namespace std;

MYSQL * conn = NULL; //MySQL连接句柄

//读取配置

bool read_conf(string &dbhost,

string &dbuser,

string &dbpass,

string &dbname){

ifstream is("judge.conf");

is >> dbhost >> dbuser >> dbpass >> dbname;

return true;

}

bool query(){

int status, state, state2;

MYSQL_RES * res;

MYSQL_ROW   row;

string cmd;

MYSQL *conn, mysql;

string dbhost, dbuser, dbpass, dbname;

if(read_conf(dbhost,dbuser, dbpass, dbname)){ //读取数据库

if (mysql_init(&mysql) == NULL){

fprintf(stderr, "初始化错误\n");

return false;

}

conn = mysql_real_connect(&mysql, dbhost.c_str(), dbuser.c_str(),

dbpass.c_str(), dbname.c_str(), NULL,

"/var/run/mysqld/mysqld.sock", 0);

if(conn == NULL){ //连接失败

fprintf(stderr, "连接失败!\n");

return false;

}

}else{ //读取配置失败

fprintf(stderr, "读取配置失败!\n");

return false;

}

cmd = "SELECT OOXX FROM OOXX";

cout << "Command: " << cmd << endl;

state = mysql_query(conn, cmd.c_str());

cout << "state: " << state << endl;

if(state != 0){//查询出错

fprintf(stderr, "%s\n", mysql_error(conn));

return false;

}

res = mysql_store_result(conn);

cout << "affected_rows:" << conn->affected_rows << endl;

while(row = mysql_fetch_row(res), row != NULL){

printf("%s\n", row[0]);

}

return true;

}

int main(){

query();

return 0;

}

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