C++使用Mysql的详细步骤及各个常用方法的代码演示：select,insert,update,delete

1.mysql的初始化initConnection:

1)mysql_init():初始化数据库

2)mysql_real_connect()(不推荐用Mysql_connect())：连接数据库

详细代码如下：

 1 bool dataBase::initConnection() { 2     try { 3         if (mysql_init(&m_sqlCon) == NULL) { 4             std::cout << "初始化数据库失败" << std::endl; 5             return false; 6         } 7         // localhost:服务器 root为账号密码 test为数据库名 3306为端口     8         if (!mysql_real_connect(&m_sqlCon, host, user, pass,databaseName, port, NULL, 0)) 9         {10             std::cout << "数据库连接失败" << std::endl;11             return false;12         }13         std::cout << "数据库连接成功" << std::endl;14         return true;15     }16     catch (...)17     {18         std::cout << "出错啦" << std::endl;19         return false;20     }21 }

2.mysql的查询select：

1）mysql_query()：进行查询语句2）mysql_store_result()：获得查询结果3)mysql_fetch_field()以及mysql_fetch_row()：获得结果集中的内容4）mysql_free_result()

代码如下：

 1 void dataBase::user_query() { 2     if (mysql_query(&m_sqlCon, "select * from user")) { 3         std::cout << "查询失败" << std::endl; 4         return; 5     } 6     std::cout << "查询成功" << std::endl; 7     MYSQL_RES *result; 8     result = mysql_store_result(&m_sqlCon); 9     if (result) {10         int row_num,col_num;11         row_num = mysql_num_rows(result);12         col_num = mysql_num_fields(result);13         std::cout << "共有" << row_num << "条数据，以下为其详细内容：" << std::endl;14         MYSQL_FIELD *fd;15         while (fd = mysql_fetch_field(result)) {16             std::cout << fd->name << "\t";17         }18         std::cout << std::endl;19         MYSQL_ROW sql_row;20         while (sql_row = mysql_fetch_row(result)) {21             for (int i = 0; i < col_num; i++) {22                 if (sql_row[i] == NULL) std::cout << "NULL\t";23                 else std::cout << sql_row[i] << "\t";24             }25             std::cout << std::endl;26         }27     }28     if(result!=NULL)29     mysql_free_result(result);30 31 }

3.mysql的插入语句insert:

1）mysql_query()通过select判断是否已经存在（可以省略）

2)通过mysql_query()进行插入

代码如下：

 1 void dataBase::user_insert(UserBody &body) { 2     char select_user[255]; 3     char query[255]; 4     MYSQL_RES *result; 5     sprintf(select_user, "select * from user where UserName='%s'", body.userName); 6     if (mysql_query(&m_sqlCon, select_user)||!(result = mysql_store_result(&m_sqlCon))) { 7         std::cout << "插入查询失败" << std::endl; 8         return; 9     }10     if (mysql_num_rows(result)) {11         std::cout << "用户已存在" << std::endl;12         mysql_free_result(result);13         return;14     }15     mysql_free_result(result);16     sprintf(query, "insert into user(UserName,UserPass,ConnectionNum,UseFor) values('%s','%s',%d,%d)", body.userName, body.userPass, body.connection, body.type);17     if (mysql_query(&m_sqlCon, query)) {18         std::cout << "插入数据失败" << std::endl;19         return;20     }21     std::cout << "插入数据成功,共插入：" <<mysql_affected_rows(&m_sqlCon)<<"行" << std::endl;22 }

4.mysql的修改语句update

修改与添加的步骤类似，直接贴出代码就不做赘述了。

代码如下：

 1 void dataBase::user_update(UserBody &body) { 2     char query[255]; 3     char select_user[255]; 4     MYSQL_RES *result; 5     sprintf(select_user, "select * from user where UserName='%s'", body.userName); 6     if (mysql_query(&m_sqlCon, select_user) || !(result = mysql_store_result(&m_sqlCon))) { 7         std::cout << "修改查询失败" << std::endl; 8         return; 9     }10     if (mysql_num_rows(result) == 0) {11         std::cout << "要修改的用户不存在" << std::endl;12         mysql_free_result(result);13         return;14     }15     mysql_free_result(result);16     sprintf(query, "update user set UserPass='%s',ConnectionNum=%d,UseFor=%d where UserName='%s'", body.userPass, body.connection, body.type, body.userName);17     if (mysql_query(&m_sqlCon, query)) {18         std::cout << "修改失败" << std::endl;19         return;20     }21     std::cout << "修改成功，共修改：" << mysql_affected_rows(&m_sqlCon) << "行" << std::endl;22 }

5.mysql的删除操作delete

其实删除、修改和插入操作都是类似的，会其中一个其他应该都差不多了，我也就直接贴出代码了。

代码如下：

 1 void dataBase::user_delete(char *userName) { 2     char query[255]; 3     char select_user[255]; 4     MYSQL_RES *result; 5     sprintf(select_user, "select * from user where UserName='%s'", userName); 6     if (mysql_query(&m_sqlCon, select_user)||!(result = mysql_store_result(&m_sqlCon))) { 7         std::cout << "删除查询失败" << std::endl; 8         return; 9     }10     if (mysql_num_rows(result)==0) {11         std::cout << "要删除的用户不存在" << std::endl;12         mysql_free_result(result);13         return;14     }15     mysql_free_result(result);16     sprintf(query, "delete from user where UserName='%s'", userName);17     if (mysql_query(&m_sqlCon, query)) {18         std::cout << "删除失败" << std::endl;19         return;20     }21     std::cout << "删除成功，共删除：" << mysql_affected_rows(&m_sqlCon) << "行" << std::endl;22 }

原文地址：http://www.cnblogs.com/fnlingnzb-learner/p/5829556.html