Intellij Mybatis连接Mysql数据库

有好一段时间没有学习新东西了，过了个十月一感觉事情还是越早做越好，废话不多说了，说一下用mybatis连接MySQL数据库，上一篇写了jdbc测试，我的数据库表还是原来的。由于从网上查的资料大部分都是eclipse，由于我是做Android开发的，习惯了ide，所以就硬着头皮来了，中间其实遇到过好多问题。 看一下工程结构 先说一下Java代码，dao是查询接口，model是ben和对应的查询语句的xml，我感觉这样有点不好，user.xml放在dao里面比较好，等理 0 Comments

有好一段时间没有学习新东西了，过了个十月一感觉事情还是越早做越好，废话不多说了，说一下用mybatis连接MySQL数据库，上一篇写了jdbc测试，我的数据库表还是原来的。由于从网上查的资料大部分都是eclipse，由于我是做Android开发的，习惯了ide，所以就硬着头皮来了，中间其实遇到过好多问题。

看一下工程结构

先说一下Java代码，dao是查询接口，model是ben和对应的查询语句的xml，我感觉这样有点不好，user.xml放在dao里面比较好，等理解了就知道了，由于我是初学者所以好多东西都不是很理解，后期会给出合理的包的定义

test是我做测试用的

再说一下resources，configuration是配置文件，log4j是日志打印，其他的暂时用不到。

好来看一下代码，我按照建文件的顺序给大家来，
首先需要有一个对象，对象根据数据库建

user.java

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package com.fanyafeng.model;

import java.util.Date;

/**

* Author： fanyafeng

* Data： 16/10/11 14:56

* Email: fanyafeng@live.cn

*/

public class User {

private int id;

private String username;

private Date birthday;

private String sex;

private String address;

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public Date getBirthday() {

return birthday;

}

public void setBirthday(Date birthday) {

this.birthday = birthday;

}

public String getSex() {

return sex;

}

public void setSex(String sex) {

this.sex = sex;

}

public String getAddress() {

return address;

}

public void setAddress(String address) {

this.address = address;

}

@Override

public String toString() {

return "User{" +

"id=" + id +

", username='" + username + '\'' +

", birthday=" + birthday +

", sex='" + sex + '\'' +

", address='" + address + '\'' +

'}';

}

}

iuserdao.java

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package com.fanyafeng.dao;

import com.fanyafeng.model.User;

import java.util.List;

/**

* Author： fanyafeng

* Data： 16/10/11 14:55

* Email: fanyafeng@live.cn

*/

public interface IUserDao {

public List<User> queryUserByName(String name);

public User selectUserById(int id);

public void add();

public void del(int id);

public void alter(int id);

}

user.xml

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<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"

"http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<!--resultType 指定单条记录返回的类型-->

<mapper namespace="com.fanyafeng.dao.IUserDao">

<select id="selectUserById" parameterType="int" resultType="com.fanyafeng.model.User">

select * from user where id = #{id}

</select>

<!--'%${value}' 表示拼接sql串,只能使用value,有可能会引起sql注入的情况-->

<select id="queryUserByName" parameterType="String" resultType="com.fanyafeng.model.User">

SELECT * FROM user WHERE username LIKE #{name}

</select>

<!--INSERT INTO USER (id,username,sex,address) VALUE (null,"陈潇然","女","大学同学")-->

<insert id="add" parameterType="com.fanyafeng.model.User">

insert into user (id,username,birthday,sex,address) values (#{id},#{username},#{birthday},#{sex},#{address})

</insert>

</mapper>

usertest.java

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package com.fanyafeng.test;

import com.fanyafeng.model.User;

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 java.io.IOException;

import java.io.Reader;

import java.util.Date;

import java.util.List;

/**

* Author： fanyafeng

* Data： 16/10/11 14:58

* Email: fanyafeng@live.cn

*/

public class UserTest {

private static SqlSessionFactory sqlSessionFactory;

private static Reader reader;

static {

try {

reader = Resources.getResourceAsReader("Configuration.xml");

sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);

} catch (IOException e) {

e.printStackTrace();

}

}

public static void main(String[] args) {

SqlSession sqlSession = sqlSessionFactory.openSession();

try {

// User user = (User) sqlSession.selectOne("com.fanyafeng.dao.IUserDao.selectUserById", 2);

// System.out.println(user.getAddress() + user.getSex() + user.getBirthday());

// System.out.println(user.getId() + user.getUsername());

//

//

List<User> userList = sqlSession.selectList("com.fanyafeng.dao.IUserDao.queryUserByName", "%李宁%");

for (int i = 0; i < userList.size(); i++) {

System.out.println(userList.get(i).toString());

}

User user = new User();

user.setId(100);

user.setBirthday(new Date());

user.setUsername("李宁");

user.setSex("女");

user.setAddress("家里蹲");

int isAdd = sqlSession.insert("com.fanyafeng.dao.IUserDao.add", user);

sqlSession.commit();//不要忘记

} finally {

sqlSession.close();

}

}

}

configration.xml

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<?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>

<!--如果在mapper中进行配置了,此处可以省略配置-->

<!--<typeAliases>-->

<!--<typeAlias alias="User" type="com.fanyafeng.model.User"/>-->

<!--</typeAliases>-->

<!-- 和spring整合后 environments配置将废除-->

<environments default="development">

<environment id="development">

<!-- 使用jdbc事务管理-->

<transactionManager type="JDBC"/>

<!-- 数据库连接池-->

<dataSource type="POOLED">

<property name="driver" value="com.mysql.jdbc.Driver"/>

<property name="url" value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8"/>

<property name="username" value="root"/>

<property name="password" value=""/>

</dataSource>

</environment>

</environments>

<mappers>

<mapper resource="com/fanyafeng/model/User.xml"/>

</mappers>

</configuration>

log4j的话大家根据自己的爱好添加就好了，代码中注释写的很详细了，我就不细讲了，这里有个地方让我很憋屈，问了个大神才知道咋回事，截图中有target目录吧，这是编译好文件的存放位置，可是，问题来了，java文件给我编译好放在哪里了，可是非resource得xml文件没有给我放进去，丢出来了一个异常，查了好多资料答非所问，然后是这样解决的
看一下pom.xml文件，我更改后的，加了build标签中了

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

<modelVersion>4.0.0</modelVersion>

<groupId>com.fanyafeng</groupId>

<artifactId>mybatisdemo</artifactId>

<packaging>war</packaging>

<version>1.0-SNAPSHOT</version>

<name>mybatisdemo Maven Webapp</name>

<url>http://maven.apache.org</url>

<build>

<finalName>mybatisdemo</finalName>

<resources>

<resource>

<directory>src/main/resources</directory>

<includes>

<include>**/*.xml</include>

<include>**/*.properties</include>

</includes>

</resource>

<resource>

<directory>src/main/java</directory>

<includes>

<include>**/*.xml</include>

</includes>

</resource>

</resources>

</build>

<dependencies>

<dependency>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

<version>3.8.1</version>

<scope>test</scope>

</dependency>

<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->

<dependency>

<groupId>mysql</groupId>

<artifactId>mysql-connector-java</artifactId>

<version>5.1.38</version>

</dependency>

<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->

<dependency>

<groupId>org.mybatis</groupId>

<artifactId>mybatis</artifactId>

<version>3.2.8</version>

</dependency>

<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->

<dependency>

<groupId>org.slf4j</groupId>

<artifactId>slf4j-log4j12</artifactId>

<version>1.7.21</version>

</dependency>

<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->

<dependency>

<groupId>org.slf4j</groupId>

<artifactId>slf4j-api</artifactId>

<version>1.7.21</version>

</dependency>

<!-- https://mvnrepository.com/artifact/log4j/log4j -->

<dependency>

<groupId>log4j</groupId>

<artifactId>log4j</artifactId>

<version>1.2.17</version>

</dependency>

<!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->

<dependency>

<groupId>org.apache.logging.log4j</groupId>

<artifactId>log4j-core</artifactId>

<version>2.5</version>

</dependency>

<!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-api -->

<dependency>

<groupId>org.apache.logging.log4j</groupId>

<artifactId>log4j-api</artifactId>

<version>2.5</version>

</dependency>

<!-- https://mvnrepository.com/artifact/org.javassist/javassist -->

<dependency>

<groupId>org.javassist</groupId>

<artifactId>javassist</artifactId>

<version>3.18.1-GA</version>

</dependency>

<!-- https://mvnrepository.com/artifact/commons-logging/commons-logging -->

<dependency>

<groupId>commons-logging</groupId>

<artifactId>commons-logging</artifactId>

<version>1.1.1</version>

</dependency>

<!-- https://mvnrepository.com/artifact/cglib/cglib -->

<dependency>

<groupId>cglib</groupId>

<artifactId>cglib</artifactId>

<version>2.2.2</version>

</dependency>

<!-- https://mvnrepository.com/artifact/asm/asm -->

<dependency>

<groupId>asm</groupId>

<artifactId>asm</artifactId>

<version>3.3.1</version>

</dependency>

</dependencies>

</project>

这就可以了，我这里实现了查，增，别的正在学习中。

以上所述是小编给大家介绍的Intellij Mybatis连接Mysql数据库，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！

原文链接：http://blog.csdn.net/qq_23195583/article/details/52792199

本文链接：https://my.lmcjl.com/post/12937.html

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