Intellij Mybatis连接Mysql数据库

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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
这里写图片描述
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

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

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

<?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

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

<?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

<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。
写给自己：不开始永远不知道什么时候能结束

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