参考网站：
一、目录结构
二、代码详解
1、maven核心配置文件
<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.mollen.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.5</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
</dependency>
</dependencies>
<!-- 可以解决idea不能编译src目录下的xml文件 -->
<build>
<!--加载src目录下的静态文件-->
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
</resources>
<plugins>
<!--jdk编译版本设置-->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>utf-8</encoding>
</configuration>
</plugin>
</plugins>
</build>
</project>
2、mybatis核心配置文件：SqlMapConfig.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">
<!--mybatis环境配置-->
<configuration>
<!--加载数据源文件-->
<properties resource="db.properties"></properties>
<!--配置别名-->
<typeAliases>
<package name="com.mollen.dao"/>
<package name="com.mollen.bean"/>
</typeAliases>
<!--配置数据源-->
<environments default="mysql">
<environment id="mysql">
<transactionManager type="JDBC"></transactionManager>
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}"></property>
<property name="url" value="${jdbc.url}"></property>
<property name="username" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
</dataSource>
</environment>
</environments>
<!--配置映射/-->
<mappers>
<!--单个映射配置-->
<!--<mapper resource="com/mollen/dao/UserDao.xml"/>-->
<!--批量映射配置-->
<package name="com.mollen.dao"/>
</mappers>
</configuration>
3、配置数据源文件
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis_test
jdbc.username=root
jdbc.password=root
4、映射文件配置：UserDao.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">
<!--配置需要映射的接口的完全限定名称-->
<mapper namespace="com.mollen.dao.UserDao">
<!--配置 查询结果的列名和实体类的属性名的对应关系/暂不考虑多表映射-->
<resultMap id="userMap" type="user">
<!--主键字段的对应-->
<id property="id" column="id"></id>
<!-- 非主键字段的对应-->
<result property="username" column="username"></result>
<result property="birthday" column="birthday"></result>
<result property="sex" column="sex"></result>
<result property="address" column="address"></result>
</resultMap>
<!--查询所有-->
<select id="findAll" resultType="user">
SELECT * FROM user;
</select>
<!--根据id查询用户-->
<select id="findUserById" resultMap="userMap">
SELECT * FROM user WHERE id in
<foreach collection="array" open="(" close=")" separator="," item="uid">
#{uid}
</foreach>
</select>
<!--根据用户模糊查询-->
<select id="findByName" resultMap="userMap">
select * from user where username like #{name}
</select>
<!--根据条件模糊查询-->
<select id="findByCondition" resultMap="userMap">
SELECT * FROM user WHERE 1=1
<if test="username != null">
AND username like #{username}
</if>
<if test="sex != null">
AND sex like #{sex}
</if>
</select>
<!--添加用户-->
<insert id="saveOne">
INSERT INTO
user
VALUES
(
null,
#{username},
#{birthday},
#{sex},
#{address}
)
</insert>
<!--删除用户/根据传入参数类型自动匹配sql参数值-->
<delete id="deleteOne" >
DELETE FROM
user
WHERE
id = #{id}
</delete>
<!--修改用户-->
<update id="updateUser">
UPDATE
user
SET
username = #{username},
birthday = #{birthday},
sex = #{sex},
address = #{address}
WHERE
id = #{id}
</update>
</mapper>
5、Dao接口类：UserDao.java
package com.mollen.dao;
import com.mollen.bean.User;
import java.util.List;
/**
* @ClassName: UserDao
* @Auther: Mollen
* @CreateTime: 2018-10-27 20:19:07
* @Description:
*/
public interface UserDao {
/**
* 1.查询所有
* @return
*/
public List<User> findAll();
/**
* 2.根据id查询用户(动态执行参数)
* @return
*/
public List<User> findUserById(Integer...ids);
/**
* 3.根据用户模糊查询
*/
public List<User> findByName(String username);
/**
* 4.根据条件模糊查询
* @param user
* @return
*/
public List<User> findByCondition(User user);
/**
* 5.添加一条数据
* @param user
*/
public void saveOne(User user);
/**
* 6.删除一条数据
* @param user
*/
public void deleteOne(User user);
/**
* 7.修改用户
*/
public void updateUser(User user);
}
6、实体类：User.java
package com.mollen.bean;
import java.util.Date;
/**
* @ClassName: User
* @Auther: Mollen
* @CreateTime: 2018-10-29 10:11:48
* @Description:
*/
public class User {
private int id;
private String username;
private Date birthday;
private String sex;
private String address;
//getter/setter/toString/...
}