C++连接MYSQL数据库

openkk 9年前

一个实现C/C++连接MYSQL数据库的很好的例子
//下面的代码是一个实现C++连接MYSQL数据库的很好的例子  //这里用了建表,插入,检索,删表等常用功能  //我用VC++6.0生成,已经成功连接了。  //在VC++6.0中要想把做一下两步准备工作才可以。  //(1)Tools->Options->Directories->Include files中添加C:\Program Files\MySQL\MySQL Server 6.0\include  //(2)Tools->Options->Directories->Library files中添加C:\Program Files\MySQL\MySQL Server 6.0\lib\opt  //其实就是将头文件和库文件包含进来  //我觉得这个例子写的很好,再结合自己的试验,特地介绍给大家!    #include <winsock.h>  #include <iostream>  #include <string>  #include <mysql.h>  using namespace std;    #pragma comment(lib, "ws2_32.lib")  #pragma comment(lib, "libmysql.lib")    //单步执行,不想单步执行就注释掉  #define STEPBYSTEP    int main() {   cout << "****************************************" << endl;    #ifdef STEPBYSTEP   system("pause");  #endif     //必备的一个数据结构   MYSQL mydata;     //初始化数据库   if (0 == mysql_library_init(0, NULL, NULL)) {    cout << "mysql_library_init() succeed" << endl;   } else {    cout << "mysql_library_init() failed" << endl;    return -1;   }    #ifdef STEPBYSTEP   system("pause");  #endif     //初始化数据结构   if (NULL != mysql_init(&mydata)) {    cout << "mysql_init() succeed" << endl;   } else {    cout << "mysql_init() failed" << endl;    return -1;   }    #ifdef STEPBYSTEP   system("pause");  #endif     //在连接数据库之前,设置额外的连接选项   //可以设置的选项很多,这里设置字符集,否则无法处理中文   if (0 == mysql_options(&mydata, MYSQL_SET_CHARSET_NAME, "gbk")) {    cout << "mysql_options() succeed" << endl;   } else {    cout << "mysql_options() failed" << endl;    return -1;   }    #ifdef STEPBYSTEP   system("pause");  #endif     //连接数据库   if (NULL     != mysql_real_connect(&mydata, "localhost", "root", "test", "test",       3306, NULL, 0))     //这里的地址,用户名,密码,端口可以根据自己本地的情况更改     {    cout << "mysql_real_connect() succeed" << endl;   } else {    cout << "mysql_real_connect() failed" << endl;    return -1;   }    #ifdef STEPBYSTEP   system("pause");  #endif     //sql字符串   string sqlstr;     //创建一个表   sqlstr = "CREATE TABLE IF NOT EXISTS user_info";   sqlstr += "(";   sqlstr +=     "user_id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT 'Unique User ID',";   sqlstr +=     "user_name VARCHAR(100) CHARACTER SET gb2312 COLLATE gb2312_chinese_ci NULL COMMENT 'Name Of User',";   sqlstr +=     "user_second_sum INT UNSIGNED NOT NULL DEFAULT 0 COMMENT 'The Summation Of Using Time'";   sqlstr += ");";   if (0 == mysql_query(&mydata, sqlstr.c_str())) {    cout << "mysql_query() create table succeed" << endl;   } else {    cout << "mysql_query() create table failed" << endl;    mysql_close(&mydata);    return -1;   }    #ifdef STEPBYSTEP   system("pause");  #endif     //向表中插入数据   sqlstr =     "INSERT INTO user_info(user_name) VALUES('公司名称'),('一级部门'),('二级部门'),('开发小组'),('姓名');";   if (0 == mysql_query(&mydata, sqlstr.c_str())) {    cout << "mysql_query() insert data succeed" << endl;   } else {    cout << "mysql_query() insert data failed" << endl;    mysql_close(&mydata);    return -1;   }    #ifdef STEPBYSTEP   system("pause");  #endif     //显示刚才插入的数据   sqlstr = "SELECT user_id,user_name,user_second_sum FROM user_info";   MYSQL_RES *result = NULL;   if (0 == mysql_query(&mydata, sqlstr.c_str())) {    cout << "mysql_query() select data succeed" << endl;      //一次性取得数据集    result = mysql_store_result(&mydata);    //取得并打印行数    int rowcount = mysql_num_rows(result);    cout << "row count: " << rowcount << endl;      //取得并打印各字段的名称    unsigned int fieldcount = mysql_num_fields(result);    MYSQL_FIELD *field = NULL;    for (unsigned int i = 0; i < fieldcount; i++) {     field = mysql_fetch_field_direct(result, i);     cout << field->name << "\t\t";    }    cout << endl;      //打印各行    MYSQL_ROW row = NULL;    row = mysql_fetch_row(result);    while (NULL != row) {     for (int i = 0; i < fieldcount; i++) {      cout << row[i] << "\t\t";     }     cout << endl;     row = mysql_fetch_row(result);    }     } else {    cout << "mysql_query() select data failed" << endl;    mysql_close(&mydata);    return -1;   }    #ifdef STEPBYSTEP   system("pause");  #endif     //删除刚才建的表   sqlstr = "DROP TABLE user_info";   if (0 == mysql_query(&mydata, sqlstr.c_str())) {    cout << "mysql_query() drop table succeed" << endl;   } else {    cout << "mysql_query() drop table failed" << endl;    mysql_close(&mydata);    return -1;   }   mysql_free_result(result);   mysql_close(&mydata);   mysql_server_end();     system("pause");   return 0;  }