mysql安装

sudo apt-get install update

sudo apt-get install mysql-server libmysqlclient-dev mysql-workbench

mysql启动/重启/停止

sudo service mysql start/restart/stop

登录mysql命令：mysql -uroot -p

错误异常：

解决办法：

修改mysqld.cnf配置文件

在ubuntu的terminal（也即终端）上输入sudo nano /etc/mysql/mysql.conf.d/mysqld.cnf,进入到这个配置文件，然后在这个配置文件中的[mysqld]这一块中加入skip-grant-tables这句话。

[mysqld]

#

# * Basic Settings

#

user = mysql

pid-file = /var/run/mysqld/mysqld.pid

socket = /var/run/mysqld/mysqld.sock

port = 3306

basedir = /usr

datadir = /var/lib/mysql

tmpdir = /tmp

lc-messages-dir = /usr/share/mysql

skip-external-locking

skip-grant-tables

作用：就是让你可以不用密码登录进去mysql。

保存，退出。输入：service mysql restart，重新启动mysql。

重新登录设置密码。

代码

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

using namespace std;
///
/// \brief sql_create 创建数据库
///
void sql_create()
{
    MYSQL mysql;
    mysql_init(&mysql);
    if(!mysql_real_connect(&mysql, "localhost", "root", "root", "mysql", 3306, NULL, 0)) {
        cout<<"mysql connect error: "<<mysql_error(&mysql)<<" "<<mysql_errno(&mysql)<<endl;
    }

    string str = "create database school;";

    mysql_real_query(&mysql, str.c_str(), str.size());

    str = "alter database school charset=utf8;";

    mysql_real_query(&mysql, str.c_str(), str.size());
// 自动生成id add数据时去掉id
//    str = "create table school.students(id int(10) primary key auto_increment, name varchar(20) not null, age int(3) not null);";
//手动添加id
    str = "create table school.students(id int(10) primary key , name varchar(20) not null, age int(3) not null);";

    mysql_real_query(&mysql, str.c_str(), str.size());

    mysql_close(&mysql);
}
///
/// \brief sql_add 增加数据
///
void sql_add()
{
    MYSQL mysql;
    mysql_init(&mysql);
    mysql_options(&mysql, MYSQL_SET_CHARSET_NAME, "utf8");
    mysql_options(&mysql, MYSQL_INIT_COMMAND, "SET NAMES utf8");

    if(!mysql_real_connect(&mysql, "localhost", "root", "root", "school", 3306, NULL, 0)) {
        cout<<"mysql connect error: "<<mysql_error(&mysql)<<" "<<mysql_errno(&mysql);
    }

    string str = "insert into students(id, name, age) values(1, \'张三\', 20)";
    mysql_real_query(&mysql, str.c_str(), str.size());
    str = "insert into students(id, name, age) values(2, \'李四\', 18)";
    mysql_real_query(&mysql, str.c_str(), str.size());
    str = "insert into students(id, name, age) values(3, \'王五\', 19)";
    mysql_real_query(&mysql, str.c_str(), str.size());
    str = "insert into students(id, name, age) values(4, \'赵六\', 21)";
    mysql_real_query(&mysql, str.c_str(), str.size());
    str = "insert into students(id, name, age) values(5, \'马七\', 20)";
    mysql_real_query(&mysql, str.c_str(), str.size());

    mysql_close(&mysql);
}
///
/// \brief sql_modify 修改数据
///
void sql_modify()
{
    MYSQL mysql;
    mysql_init(&mysql);
    mysql_options(&mysql, MYSQL_SET_CHARSET_NAME, "utf8");
    mysql_options(&mysql, MYSQL_INIT_COMMAND, "SET NAMES utf8");

    if(!mysql_real_connect(&mysql, "localhost", "root", "root", "school", 3306, NULL, 0)) {
        cout<<"mysql connect error: "<<mysql_error(&mysql)<<" "<<mysql_errno(&mysql);
    }

    string str = "update students set age = 30 where name = \'王五\'";

    mysql_real_query(&mysql, str.c_str(), str.size());

    mysql_close(&mysql);
}
///
/// \brief sql_delete 删除数据
///
void sql_delete()
{
    MYSQL mysql;
    mysql_init(&mysql);
    mysql_options(&mysql, MYSQL_SET_CHARSET_NAME, "utf8");
    mysql_options(&mysql, MYSQL_INIT_COMMAND, "SET NAMES utf8");

    if(!mysql_real_connect(&mysql, "localhost", "root", "root", "school", 3306, NULL, 0)) {
        cout<<"mysql connect error: "<<mysql_error(&mysql)<<" "<<mysql_errno(&mysql);
    }

    string str = "delete from students where name = \'赵六\'";

    mysql_real_query(&mysql, str.c_str(), str.size());

    mysql_close(&mysql);
}
///
/// \brief sql_query 查询数据
///
void sql_query()
{
    MYSQL mysql;
    mysql_init(&mysql);
    mysql_options(&mysql, MYSQL_SET_CHARSET_NAME, "utf8");
    mysql_options(&mysql, MYSQL_INIT_COMMAND, "SET NAMES utf8");

    if(!mysql_real_connect(&mysql, "localhost", "root", "root", "school", 3306, NULL, 0)) {
        cout<<"mysql connect error: "<<mysql_error(&mysql)<<" "<<mysql_errno(&mysql);
    }

    string str = "select * from students;";

    mysql_real_query(&mysql, str.c_str(), str.size());

    MYSQL_RES *result = mysql_store_result(&mysql);

    MYSQL_ROW row;
    while (row = mysql_fetch_row(result)) {
        cout<<"id: "<<row[0]<<" name: "<<row[1]<<" age: "<<row[2]<<endl;
    }

    mysql_free_result(result);

    mysql_close(&mysql);
}

int main()
{
    cout << "Hello World!111" << endl;
    sql_create();
    cout << "Hello World!222" << endl;
    sql_add();
    cout << "Hello World!333" << endl;
    sql_query();
    cout << "Hello World!444" << endl;
    sql_modify();
    cout << "Hello World!555" << endl;
    sql_query();
    cout << "Hello World!666" << endl;
    sql_delete();
    cout << "Hello World!777" << endl;
    sql_query();

    return 0;
}

编译：

g++ main.cpp -lmysqlclient

运行结果：