关于准备工作，请看上篇文章https://blog.csdn.net/wjl990316fddwjl/article/details/135357755

1、在LXMysql.h里面创建Connect连接函数

/数据库连接，先不考虑线程安全//unsigned short port 65535
//flag可以设置支持多条语句 默认为0；port=3306
bool Connect(const char*host,const char*user,const char* password,const char*database,unsigned short port=3306,unsigned short flag=0);

2、转到定义，写函数

bool LXMysql::Connect(const char* host, const char* user, const char* password, const char* database, unsigned short port, unsigned short flag){//if (!Init())//防止内存泄露//{//	cerr << "Connect failed,mysql is not init!" << endl;//	return false;//}if (!mysql && Init())//防止内存泄露 这样写是因为写了超时那个{cerr << "Connect failed,mysql is not init!" << endl;return false;}if (!mysql_real_connect(mysql, host, user, password, database, port, 0, NULL)){cerr << "mysql_real_connect failed!" << mysql_error(mysql) << endl;return false;}cout << "mysql connect success!" << endl;return true;}

3、测试是否成功 

在test_LXMysql.cpp里面写

//2、mysql连接,如果没有调用init，内部会自动调用if (my.Connect("127.0.0.1", "root", "990107Wjl@", "database_test")){cout << "my.connect success!" << endl;}

4、执行即可