更多的可以参考我的博客,也在陆续更新ing
http://www.hspweb.cn/
1.安装MySQL
1.1、安装MySQL(若已安装直接跳到步骤2)
sudo apt-get install mysql-server
1.2、安装完成后登陆mysql
mysql -u root -p
1.3、登陆后查看版本
select version();
image
1.4、到此一切正常。
2.配置MySQL
2.1、用Navicat登陆MySQL。
(腾讯云Ubuntu 16.04为例)
2.2、修改/etc/mysql/mysql.conf.d/mysqld.cnf
vim /etc/mysql/mysql.conf.d/mysqld.cnf
2.3、将bind-address = 127.0.0.1更改为bind-address = 0.0.0.0
2.4、保存退出
2.5、登陆MySQL
//先输入密码登陆
mysql -root -p
//然后选择数据库
mysql>use mysql;
//选择root的账户host改为%,上面2.3中已改地址,这一步不确定是否必要
mysql> update user set host='%' where user='root';
//授权
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '填写root的密码' WITH GRANT OPTION;
//更新权限
FLUSH PRIVILEGES;
//查询数据库用户
mysql>SELECT DISTINCT CONCAT('User: ''',user,'''@''',host,''';') AS query FROM mysql.user;
//退出mysql重启mysql
/etc/init.d/mysql restart
image
2.6、若想添加新用户,不用root
//创建 test123用户,设置密码为 123456
CREATE USER test123 IDENTIFIED BY '123456';
//授权
GRANT ALL PRIVILEGES ON *.* TO 'test123'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;
//更新权限
FLUSH PRIVILEGES;
//退出mysql重启mysql
/etc/init.d/mysql restart
2.7、腾讯云开放连接权限,我这里是默认开放所有端口,因为方便并且没什么重要东西就无所谓,建议只开放22,3306端口。
image3.Navicat远程连接
image3.1、远程连接mysql后,尝试用sql语句插入带自增主键属性的表,在略过主键插入时,虽然成功插入数据,但是会提示: [Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'information_s
解决办法:
set @@global.sql_mode ='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';
4.创建Java或JavaWeb项目访问数据库
4.1、下载mysql的jar包,点击此跳转百度云下载
4.2、附上Java连接代码(改IP账户密码就行)
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class connectDB {
public static void main(String[] args) {
//声明Connection对象
Connection con;
//驱动程序名
String driver = "com.mysql.jdbc.Driver";
//URL指向要访问的数据库名mydata
String url = "jdbc:mysql://填写你的腾讯云IP:3306/mysql";
//MySQL配置时的用户名
String user = "root";
//MySQL配置时的密码
String password = "填写你的密码";
//遍历查询结果集
try {
//加载驱动程序
Class.forName(driver);
//1.getConnection()方法,连接MySQL数据库!!
con = DriverManager.getConnection(url,user,password);
if(!con.isClosed())
System.out.println("Succeeded connecting to the Database!");
//2.创建statement类对象,用来执行SQL语句!!
Statement statement = con.createStatement();
//要执行的SQL语句
String sql = "select * from user";
//3.ResultSet类,用来存放获取的结果集!!
ResultSet rs = statement.executeQuery(sql);
System.out.println("-----------------");
System.out.println("执行结果如下所示:");
System.out.println("-----------------");
String job = null;
String id = null;
while(rs.next()){
//获取stuname这列数据
job = rs.getString("user");
//输出结果
System.out.println(job);
}
rs.close();
con.close();
} catch(ClassNotFoundException e) {
//数据库驱动类异常处理
System.out.println("Sorry,can`t find the Driver!");
e.printStackTrace();
} catch(SQLException e) {
//数据库连接失败异常处理
e.printStackTrace();
}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
System.out.println("数据库数据成功获取!!");
}
}
}
运行截图
image4.3、附上JavaWeb连接代码,写在servlet一样(改IP账户密码就行)
<%@page import="java.sql.Connection"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.SQLException"%>
<%@page import="java.sql.Statement"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
//声明Connection对象
Connection con;
//驱动程序名
String driver = "com.mysql.jdbc.Driver";
//URL指向要访问的数据库名mydata
String url = "jdbc:mysql://填写你腾讯云的IP/mysql";
//MySQL配置时的用户名
String user = "root";
//MySQL配置时的密码
String password = "填写你的密码";
//遍历查询结果集
try {
//加载驱动程序
Class.forName(driver);
//1.getConnection()方法,连接MySQL数据库!!
con = DriverManager.getConnection(url,user,password);
if(!con.isClosed())
out.print("Succeeded connecting to the Database!<br>");
//2.创建statement类对象,用来执行SQL语句!!
Statement statement = con.createStatement();
//要执行的SQL语句
String sql = "select * from user";
//3.ResultSet类,用来存放获取的结果集!!
ResultSet rs = statement.executeQuery(sql);
out.print("-----------------<br>");
out.print("执行结果如下所示:<br>");
out.print("-----------------<br>");
String job = null;
String id = null;
while(rs.next()){
//获取stuname这列数据
job = rs.getString("user");
//输出结果
out.print(job+"<br>");
}
rs.close();
con.close();
} catch(ClassNotFoundException e) {
//数据库驱动类异常处理
out.print("Sorry,can`t find the Driver!<br>");
e.printStackTrace();
} catch(SQLException e) {
//数据库连接失败异常处理
e.printStackTrace();
}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
out.print("数据库数据成功获取!!");
}
%>
</body>
</html>
运行截图
image
网友评论