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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