【MySQL】mysql C/C++ connect

makefile

test.cc

#include <iostream>
#include <mysql/mysql.h>//链接参数
const std::string host = "127.0.0.1";
const std::string user = "connector";
const std::string passward = "123456";//测试，东西啥也没有
const std::string db_name = "mysql_conn";
const unsigned int port = 3306;int main()
{// std::cout << mysql_get_client_info() << std::endl;//初始化mysql_init()，要使用库，必须先进行初始化！MYSQL *my = mysql_init(nullptr);if (my == nullptr){std::cerr << "mysql init error" << std::endl;return 2;}//先链接数据库if (mysql_real_connect(my, host.c_str(), user.c_str(), passward.c_str(), db_name.c_str(), port, nullptr, 0) == nullptr){std::cerr << "mysql connect error" << std::endl;return 3;}//增删查改// std::string sql = "update fortest set name='zhangsan' where id = 1";// std::string sql = "insert into fortest values(2,'王五');";// std::string sql = "delete from fortest where name = 'lishi';";std::string sql = "select * from fortest;";//下发mysql命令mysql_query  int n = mysql_query(my, sql.c_str());if (n == 0){std::cout << sql << "success:" << n << std::endl;;}else{std::cout << "mysql_query fail:" << n << std::endl;return 4;}//表结构，属性，内容转存于res，select查询结果显示//回MYSQL_RES 变量，该变量主要用于保存查询的结果//函数mysql_store_result（），malloc了一片内存空间来存储查询过来的数据，所以一定要记的 free(result),不然会造成内存泄漏MYSQL_RES *res = mysql_store_result(my);if (nullptr == res){std::cerr << "mysql_store_result error";return 5;}//表的行，列int rows = mysql_num_rows(res);//获取结果行数mysql_num_rowsint fields = mysql_num_fields(res);//获取结果列数mysql_num_fieldsstd::cout << "行：" << rows << std::endl;std::cout << "列：" << fields << std::endl;//表的列属性MYSQL_FIELD *field_array = mysql_fetch_field(res);//获取列名mysql_fetch_fieldsfor(int i = 0; i < fields; i++){std::cout << field_array[i].name << "\t";}std::cout << std::endl;//表内容for(int i = 0; i < rows; i++){MYSQL_ROW row = mysql_fetch_row(res);//获取结果内容mysql_fetch_row  MYSQL_ROW就是char **for(int j = 0; j < fields; j++){std::cout << row[j] << "\t";}std::cout << "\n";}//std::cout << "database_name: " << field_array[0].db << std::endl;std::cout << "table_name: " << field_array[0].table << std::endl;// while(true)// {//     std::cout << "MYSQL sql:" << std::endl;//     if(!std::getline(std::cin, sql) || sql == "quit")//     {//         std::cerr << "failed / quit" << std::endl;//         break;//     }//     int n = mysql_query(my, sql.c_str());//     if(n == 0)//     {//         std::cout << sql << "success:" << n << std::endl;;//     }//     else//     {//         std::cout << "mysql_query fail:" << n << std::endl;//     }// }//释放mysql_store_result开辟的空间mysql_free_result(res);mysql_close(my);return 0;
}