MySQL8对比MySQL5改变很大,所以连接方式也发生了变化。作者连接方式如下:
1.导入maven坐标:
注意作者使用的是8.0.17版本的jar包!!!!!(如果使用5.1.XX的jar包,连接的参数有一些变动,后面会有说到)
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.17</version>
</dependency>
2.写mybatis配置文件mybatis.config
注意driver使用的是com.mysql.cj.jdbc.Driver
(一定要有cj!!!!!!)url使用的是jdbc:mysql://127.0.0.1:3306/ssm?serverTimezone=UTC
必须加入时区(serverTimezome)!!!否则可能报错
(PS:如果使用5.1.XX的jar包,driver仍然选择com.mysql.jdbc.Driver,但是url需要改成:jdbc:mysql://127.0.0.1:3306/ssm?useUnicode=true&characterEncoding=utf-8&useSSL=false)
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!--配置环境-->
<environments default="mysql">
<environment id="mysql">
<transactionManager type="JDBC"></transactionManager>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.cj.jdbc.Driver"/>
<!--写自己的url、username和password!!!!!!!-->
<property name="url" value="jdbc:mysql://127.0.0.1:3306/ssm?serverTimezone=UTC"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments>
<!--引入配置文件-->
<mappers>
<!--
<mapper class="com.zenghui.dao.AccountDao"/>-->
<package name="com.zenghui.dao"/>
</mappers>
</configuration>
3.写测试类:
//前两个类是作者自己写的
import com.zenghui.dao.AccountDao;
import com.zenghui.domain.Account;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
public class TestMybatis {
@Test
public void run1() throws Exception {
//加载mybatis配置文件,写自己mybatis配置文件的名字
InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
//创建SqlSessionFactory对象
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
//创建SqlSession对象
SqlSession session = factory.openSession();
//获取代理对象
AccountDao dao = session.getMapper(AccountDao.class);
//
List<Account> all = dao.findAll();
for (Account account:all) {
System.out.println(account);
}
session.close();
in.close();
}
}
4.运行结果:
后记:
import com.zenghui.dao.AccountDao;
import com.zenghui.domain.Account;作者的两个类如下
package com.zenghui.dao;
import com.zenghui.domain.Account;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import java.util.List;
/**
* 账户dao接口
*/
public interface AccountDao {
//查询所有用户
@Select("select * from account")
public List<Account> findAll();
//保存账户信息
@Insert("insert into account (name,money) values(#{name},#{money})")
public void saveAccount(Account account);
}
package com.zenghui.domain;
import java.io.Serializable;
public class Account implements Serializable {
private Integer id;
private String name;
private Double money;
@Override
public String toString() {
return "Account{" +
"id=" + id +
", name='" + name + '\'' +
", money=" + money +
'}';
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Double getMoney() {
return money;
}
public void setMoney(Double money) {
this.money = money;
}
}