#include<bits/stdc++.h>
#include<mysql/mysql.h>

using namespace std;

int main()
{
    if(mysql_library_init(0,NULL,NULL)){
        cout<<"hhh"<<endl;
        exit(-1);// 初始化数据库
    } 
    MYSQL mysql;
    mysql_init(&mysql); //初始化一个连接句柄

    unsigned int timeout = 3000;
    mysql_options(&mysql, MYSQL_OPT_CONNECT_TIMEOUT, &timeout); //设置超时
    
    if (!mysql_real_connect(&mysql, "localhost", "root", "@Luwc1009", "test", 0, NULL, 0))
    {
        std::cout << "Error: connect mysql failed: " << mysql_error(&mysql) << std::endl;
        mysql_close(&mysql);
        return -1;
    }
    
    char* stmt = const_cast<char*>("select * from people");
    int length = strlen(stmt);
    if (mysql_real_query(&mysql, stmt, length))
    {
        printf("mysql_real_query error\n");
        return 0;
    }
    MYSQL_RES *result;
    MYSQL_ROW row;
    unsigned int num_fields;
    unsigned int num_rows;
    result = mysql_store_result(&mysql);
    if (result)
    {
        num_fields = mysql_num_fields(result); //这里获取结果集中的列数
        printf("num_fields = %d\n", num_fields);
        while((row = mysql_fetch_row(result))) //遍历结果集中每一行
        {
            unsigned long *lengths;
            lengths = mysql_fetch_lengths(result); //获取每个字段的实际长度
            for (unsigned int i = 0;  i < num_fields; ++i) //输出每个字段
            {
                printf("%s ", row[i] ? row[i] : NULL);
            }
        }
        printf("\n");
    }
    mysql_free_result(result); //释放内存
    mysql_close(&mysql);
    mysql_library_end();
}

编译命令是：g++ -g main2.cpp -o test mysql_config --cflags --libs