C API 连接MYSQL

 #include <iostream>
 #include <mysql.h>
 #include <string>

 #include <assert.h>

 int main()
 {
         // MYSQL 初始化
     MYSQL *ms_conn = mysql_init(NULL);
     if (ms_conn == NULL)
     {
         std::cout << "Error: mysql_init failed." << std::endl;
         return ;
     }
     std::cout << "Info: mysql_init success." << std::endl;

     // 连接到MYSQL 数据库服务器，最后参数CLIENT_MULTI_STATEMENTS 指定SQL 可以同时多条。
     MYSQL *ms_temp = NULL;
     ms_temp = mysql_real_connect(ms_conn, "localhost", "root", "123456sx",
             "suyh", , NULL, CLIENT_MULTI_STATEMENTS);
     if (ms_temp == NULL)
     {
         std::cout << "Error: mysql_real_connect() failed." << std::endl;
         mysql_close(ms_conn), ms_conn = NULL;
         return ;
     }
     std::cout << "Info: mysql_real_connect() succect." << std::endl;

     std::string str_sqls = "";
     // str_sqls += "SELECT * FROM player_data WHERE id = 100000;";
     // str_sqls += "SELECT * FROM player_data WHERE id = 100001;";
     str_sqls += "SELECT * FROM player_data WHERE id = 100002";

     // 执行SQL 语句
     int res = ;
     res = mysql_real_query(ms_conn, str_sqls.c_str(), str_sqls.size());
     if (res != )
     {
         std::cout << "Info: query failed, sql: " << str_sqls.c_str() << std::endl;
         mysql_close(ms_conn), ms_conn = NULL;
         return ;
     }
     std::cout << "Info: query success." << std::endl;

     do
     {
         // 取出查询结果
         MYSQL_RES *ms_res = mysql_store_result(ms_conn);
         assert(ms_res != NULL);

         // 结果集中的字段个数
         unsigned int field_num = mysql_num_fields(ms_res);
         std::cout << "fileds number is " << field_num << std::endl;

         // 每个字段的结构
         MYSQL_FIELD* field = mysql_fetch_field(ms_res);
         assert(field != NULL);

         // 取出这个结果集中的结果
         MYSQL_ROW row_data = NULL;    // typedef char ** MYSQL_ROW;
         while ()
         {
             row_data = mysql_fetch_row(ms_res);
             if (row_data == NULL)
                 break;    // 结果集中已无数据

             // 一行结果中每个字段的字符数
             unsigned long *field_lens = mysql_fetch_lengths(ms_res);
             assert(field_lens != NULL);
             for (int i = ; i < field_num; ++i)
             {
                 /*
                 std::cout << "field_lens[" << i << "] = " << field_lens[i]
                     << ", value is " << row_data[i] << std::endl;
                 */
                 std::cout << "field name: " << field[i].name;
                 if (row_data[i] == NULL)
                     std::cout << ", value is NULL" << std::endl;
                 else
                     // std::cout << ", value is " << row_data[i] << std::endl;
                     std::cout << ", value is NOT NULL" << std::endl;
             }

             // ... // 处理结果
         }
     } while (mysql_next_result(ms_conn) == );

     mysql_close(ms_conn), ms_conn = NULL;
     return ;
 }