hostname是数据库服务器的地址(如localhost)。 port是数据库服务的端口,MySQL默认端口是3306。 database_name是要连接的数据库的名称。 示例代码 下面是一个简单的Java示例,演示如何从JDBC URL中提取数据库名。 importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.SQLException;publicclassMySQLDemo{...
-- test 1111111111111111111111111111111111 CREATE DATABASE IF NOT EXISTS `school`; -- 创建一个school数据库 USE `school`;-- 创建学生表 DROP TABLE IF EXISTS `student`; CREATE TABLE `student`( `studentno` INT(4) NOT NULL COMMENT '学号', `loginpwd` VARCHAR(20) DEFAULT NULL, `studentname` ...
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// 导入需要的包importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.SQLException;// 数据库连接信息Stringurl="jdbc:mysql://localhost:3306/database_name";Stringusername="root";Stringpassword="password";// 获取数据库连接Connectionconn=null;try{conn=DriverManager.getConnection(url,username...
= new PDO("mysql:host=$servername;port=3306;dbname=$dbname", $username, $password);//链接数据库 $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // 设置 PDO 错误模式为异常 echo "PDO的API连接成功"; $conn=null;//关闭 } catch(PDOException $e){ echo "errorCode:DataBase...
| database() | +---+ | INVOICE | +---+ 1 row in set (0.00 sec) mysql> 3:查看数据库使用端口 mysql> show variables like 'port'; +---+---+ | Variable_name | Value | +---+---+ | port | 3306 | +---+---+ 1
MySQL数据库主从同步,你get到了吗? 1.前言 数据库的主从复制想必大家不是很陌生了,而且我看也有文章介绍讲解。不要傻傻的认为主从复制就是主从同步。今天来学习数据库主从同步的原理及过程,数据库主要是用来存储WEB数据,在企业当中是极为重要的,下面一起来看下。
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db - a string of the database the field came from. table - a string of the table the field came from. name - a string of the field name. type - a string of the field type in all caps. length - a number of the field length, as given by the database. The next argument is ...
This is the MySQL Reference Manual. It documents MySQL 8.0 through 8.0.43, as well as NDB Cluster releases based on version 8.0 ofNDBthrough 8.0.42, respectively. It may include documentation of features of MySQL versions that have not yet been released. For information about which versions ha...