Maven+Mybatis一些简单例子

一、创建maven工程

把依赖的包写在pom.xml中。保存后，工程会有错，需要在工程上右键选择“Maven-->Update Project”

pom.xml内容为

<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>org.mybatis</groupId>

  <artifactId>example</artifactId>

  <version>0.0.1-SNAPSHOT</version>

  <properties>

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

  </properties>

  <dependencies>

    <dependency>

        <groupId>junit</groupId>

        <artifactId>junit</artifactId>

        <version>4.12</version>

        <scope>test</scope>

    </dependency>

    <dependency>

        <groupId>org.mybatis</groupId>

        <artifactId>mybatis</artifactId>

        <version>3.3.0</version>

    </dependency>

    <dependency>

        <groupId>mysql</groupId>

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

        <version>5.1.38</version>

    </dependency>

    <dependency>

        <groupId>org.slf4j</groupId>

        <artifactId>slf4j-api</artifactId>

        <version>1.7.12</version>

    </dependency>

    <dependency>

        <groupId>org.slf4j</groupId>

        <artifactId>slf4j-log4j12</artifactId>

        <version>1.7.12</version>

    </dependency>

    <dependency>

        <groupId>log4j</groupId>

        <artifactId>log4j</artifactId>

        <version>1.2.17</version>

    </dependency>

  </dependencies>

  <build>

    <plugins>

        <plugin>

            <artifactId>maven-compiler-plugin</artifactId>

            <configuration>

                <source>1.8</source>

                <target>1.8</target>

            </configuration>

        </plugin>

    </plugins>

  </build>

</project>

pom.xml

二、简单的例子

①创建数据库mybatis，创建表sys_user，sys_role，sys_user_role，并插入数据

DROP TABLE IF EXISTS `sys_user`;

CREATE TABLE `sys_user` (

  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '用户Id',

  `user_name` varchar(50) DEFAULT NULL COMMENT '用户名',

  `user_password` varchar(50) DEFAULT NULL COMMENT '密码',

  `user_email` varchar(50) DEFAULT NULL COMMENT '邮箱',

  `user_info` text COMMENT '简介',

  `head_img` blob COMMENT '头像',

  `create_time` datetime DEFAULT NULL COMMENT '创建时间',

  PRIMARY KEY (`id`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='用户表';

INSERT INTO `sys_user` VALUES ('', 'admin', '', 'admin@mybatis.tk', '管理员', null, '2018-11-30 17:00:00');

INSERT INTO `sys_user` VALUES ('', 'test', '', 'test@mybatis.org', 'test info', 0x7B, '2018-12-05 13:45:45');

--  -----

CREATE TABLE `sys_role` (

  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '角色Id',

  `role_name` varchar(50) DEFAULT NULL COMMENT '用户名',

  `enabled` int(11) DEFAULT NULL COMMENT '有效标识',

  `create_by` bigint(20) DEFAULT NULL COMMENT '创建人',

  `create_time` datetime DEFAULT NULL COMMENT '创建时间',

  PRIMARY KEY (`id`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='角色表';

INSERT INTO `sys_role` VALUES ('', '管理员', '', '', '2018-11-30 17:05:00');

INSERT INTO `sys_role` VALUES ('', '普通用户', '', '', '2018-11-30 17:05:01');

-- ------

CREATE TABLE `sys_user_role` (

  `user_id` bigint(20) DEFAULT NULL COMMENT '用户Id',

  `role_id` bigint(20) DEFAULT NULL COMMENT '角色Id'

) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='用户角色关联表';

INSERT INTO `sys_user_role` VALUES ('', '');

INSERT INTO `sys_user_role` VALUES ('', '');

INSERT INTO `sys_user_role` VALUES ('', '');

db.sql

②创建mybatis配置文件mybatis-config.xml，位置src/main/resources下

<?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>

    <settings>

        <setting name="logImpl" value="LOG4J"/>

    </settings>

    <typeAliases>

        <package name="org.mybatis.example.model"/>

    </typeAliases>

    <environments default="development">

        <environment id="development">

            <transactionManager type="JDBC">

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

            </transactionManager>

            <dataSource type="UNPOOLED">

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

                <property name="url" value="jdbc:mysql://localhost:3306/mybatis"/>

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

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

            </dataSource>

        </environment>

    </environments>

    <mappers>

<!--         <package name="org.mybatis.example.mapper"/> -->

        <mapper resource="org/mybatis/example/mapper/UserMapper.xml"/>

        <mapper resource="org/mybatis/example/mapper/RoleMapper.xml"/>

    </mappers>

  </configuration>

mybatis-config.xml

③创建model，SysUser，SysRole和SysUserRole，位置src/main/java下，包org.mybatis.example.model

package org.mybatis.example.model;

import java.util.Date;

public class SysUser {

    private Long id;

    private String userName;

    private String userPassword;

    private String userEmail;

    private String userInfo;

    private byte[] headImg;

    private Date createTime;

    public Long getId() {

        return id;

    }

    public void setId(Long id) {

        this.id = id;

    }

    public String getUserName() {

        return userName;

    }

    public void setUserName(String userName) {

        this.userName = userName;

    }

    public String getUserPassword() {

        return userPassword;

    }

    public void setUserPassword(String userPassword) {

        this.userPassword = userPassword;

    }

    public String getUserEmail() {

        return userEmail;

    }

    public void setUserEmail(String userEmail) {

        this.userEmail = userEmail;

    }

    public String getUserInfo() {

        return userInfo;

    }

    public void setUserInfo(String userInfo) {

        this.userInfo = userInfo;

    }

    public byte[] getHeadImg() {

        return headImg;

    }

    public void setHeadImg(byte[] headImg) {

        this.headImg = headImg;

    }

    public Date getCreateTime() {

        return createTime;

    }

    public void setCreateTime(Date createTime) {

        this.createTime = createTime;

    }

}

SysUser.java

package org.mybatis.example.model;

import java.util.Date;

public class SysRole {

    private Long id;

    private String roleName;

    private int enabled;

    private Long createBy;

    private Date createTime;

    public Long getId() {

        return id;

    }

    public void setId(Long id) {

        this.id = id;

    }

    public String getRoleName() {

        return roleName;

    }

    public void setRoleName(String roleName) {

        this.roleName = roleName;

    }

    public int getEnabled() {

        return enabled;

    }

    public void setEnabled(int enabled) {

        this.enabled = enabled;

    }

    public Long getCreateBy() {

        return createBy;

    }

    public void setCreateBy(Long createBy) {

        this.createBy = createBy;

    }

    public Date getCreateTime() {

        return createTime;

    }

    public void setCreateTime(Date createTime) {

        this.createTime = createTime;

    }

}

SysRole.java

package org.mybatis.example.model;

public class SysUserRole {

    private Long userId;

    private Long roleId;

    public Long getUserId() {

        return userId;

    }

    public void setUserId(Long userId) {

        this.userId = userId;

    }

    public Long getRoleId() {

        return roleId;

    }

    public void setRoleId(Long roleId) {

        this.roleId = roleId;

    }

}

SysUserRole.java

④创建映射的xml文件，UserMapper.xml，位置src/main/resources/org/mybatis/example/mapper下

<?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">

    <mapper namespace="org.mybatis.example.mapper.UserMapper">

        <select id="selectUserById" resultMap="selectUserMap">

            select * from sys_user where id = #{id}

        </select>

        <resultMap type="org.mybatis.example.model.SysUser" id="selectUserMap">

            <id property="id" column="id" />

            <result property="userName" column="user_name"/>

            <result property="userPassword" column="user_password"/>

            <result property="userEmail" column="user_email"/>

            <result property="userInfo" column="user_info"/>

            <result property="headImg" column="head_img" jdbcType="BLOB"/>

            <result property="createTime" column="create_time" jdbcType="TIMESTAMP"/>

        </resultMap>

    </mapper>

UserMapper.xml

⑤创建Mapper的接口，UserMapper.java，位置src/main/java下，包org.mybatis.example.mapper

package org.mybatis.example.mapper;

import org.mybatis.example.model.SysUser;

public interface UserMapper {

    SysUser selectUserById(Long id);

}

UserMapper.java

⑥创建测试程序，TestSelectMapper.java，位置src/main/java下，包org.mybatis.example.app

package org.mybatis.example.app;

import java.io.IOException;

import java.io.Reader;

import java.util.List;

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.BeforeClass;

import org.junit.Test;

import org.mybatis.example.mapper.RoleMapper;

import org.mybatis.example.mapper.UserMapper;

import org.mybatis.example.model.SysRole;

import org.mybatis.example.model.SysUser;

import junit.framework.Assert;

public class TestSelectMapper {

    private static SqlSessionFactory sqlSessionFactory;

    @BeforeClass

    public static void init() {

        try {

            Reader reader = Resources.getResourceAsReader("mybatis-config.xml");

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

            reader.close();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    @Test

    public void testSelectUserById() {

        SqlSession sqlSession = sqlSessionFactory.openSession();

        try {

            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

            SysUser sysUser = userMapper.selectUserById(1L);

            Assert.assertNotNull(sysUser);

            Assert.assertEquals("admin", sysUser.getUserName());

            System.out.println(sysUser.toString());

        } finally {

            sqlSession.close();

        }

    }

}

TestSelectMapper.java

三、综合增删改查

<?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">

    <mapper namespace="org.mybatis.example.mapper.UserMapper">

        <select id="selectUserById" resultMap="selectUserMap">

            select * from sys_user where id = #{id}

        </select>

        <resultMap type="org.mybatis.example.model.SysUser" id="selectUserMap">

            <id property="id" column="id" />

            <result property="userName" column="user_name"/>

            <result property="userPassword" column="user_password"/>

            <result property="userEmail" column="user_email"/>

            <result property="userInfo" column="user_info"/>

            <result property="headImg" column="head_img" jdbcType="BLOB"/>

            <result property="createTime" column="create_time" jdbcType="TIMESTAMP"/>

        </resultMap>

        <select id="selectAllUsers" resultType="org.mybatis.example.model.SysUser">

            select user_name userName, user_password userPassword,

                user_email userEmail, user_info userInfo,

                user_info userInfo, head_img headImg,

                create_time createTime from sys_user

        </select>

        <insert id="insertAUser">

            insert into sys_user (id, user_name, user_password, user_email, user_info, head_img, create_time) values

            (#{id}, #{userName}, #{userPassword}, #{userEmail}, #{userInfo}, #{headImg, jdbcType=BLOB},

            #{createTime, jdbcType=TIMESTAMP})

        </insert>

        <insert id="insertAUserWithoutId" useGeneratedKeys="true" keyProperty="id">

            insert into sys_user (user_name, user_password, user_email, user_info, head_img, create_time) values

            (#{userName}, #{userPassword}, #{userEmail}, #{userInfo}, #{headImg, jdbcType=BLOB}, #{createTime, jdbcType=TIMESTAMP})

        </insert>

        <update id="updateAUser">

            update sys_user set

                user_name = #{userName},

                user_email = #{userEmail},

                user_info = #{userInfo},

                create_time = #{createTime, jdbcType=TIMESTAMP}

            where id = #{id}

        </update>

        <delete id="deleteAUser">

            delete from sys_user where id = #{id}

        </delete>

    </mapper>

UserMapper.xml

package org.mybatis.example.mapper;

import java.util.List;

import org.mybatis.example.model.SysUser;

public interface UserMapper {

    SysUser selectUserById(Long id);

    List<SysUser> selectAllUsers();

    int insertAUser(SysUser sysUser);

    int insertAUserWithoutId(SysUser sysUser);

    int updateAUser(SysUser sysUser);

    int deleteAUser(Long id);

}

UserMapper.java

<?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">

  <mapper namespace="org.mybatis.example.mapper.RoleMapper">

    <select id="selectRolesByUserId" resultType="org.mybatis.example.model.SysRole">

        select r.id,

               r.role_name roleName,

               r.enabled,

               r.create_by createBy,

               r.create_time createTime

        from sys_user u

        inner join sys_user_role ur on u.id = ur.user_id

        inner join sys_role r on r.id = ur.role_id

        where u.id = #{userId}

    </select>

    <select id="selectRolesByUserIdAndRoleEnabled" resultType="org.mybatis.example.model.SysRole">

        select r.id,

               r.role_name roleName,

               r.enabled,

               r.create_by createBy,

               r.create_time createTime

        from sys_user u

        inner join sys_user_role ur on u.id = ur.user_id

        inner join sys_role r on r.id = ur.role_id

        where u.id = #{userId} and r.enabled = #{enabled}

    </select>

  </mapper>

RoleMapper.xml

package org.mybatis.example.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Param;

import org.mybatis.example.model.SysRole;

public interface RoleMapper {

    List<SysRole> selectRolesByUserId(Long id);

    List<SysRole> selectRolesByUserIdAndRoleEnabled(

            @Param("userId") Long userId,

            @Param("enabled") int enabled);

}

RoleMapper.java

package org.mybatis.example.app;

import java.io.IOException;

import java.io.Reader;

import java.util.List;

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.BeforeClass;

import org.junit.Test;

import org.mybatis.example.mapper.RoleMapper;

import org.mybatis.example.mapper.UserMapper;

import org.mybatis.example.model.SysRole;

import org.mybatis.example.model.SysUser;

import junit.framework.Assert;

public class TestSelectMapper {

    private static SqlSessionFactory sqlSessionFactory;

    @BeforeClass

    public static void init() {

        try {

            Reader reader = Resources.getResourceAsReader("mybatis-config.xml");

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

            reader.close();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    @Test

    public void testSelectUserById() {

        SqlSession sqlSession = sqlSessionFactory.openSession();

        try {

            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

            SysUser sysUser = userMapper.selectUserById(1L);

            Assert.assertNotNull(sysUser);

            Assert.assertEquals("admin", sysUser.getUserName());

            System.out.println(sysUser.toString());

        } finally {

            sqlSession.close();

        }

    }

    @Test

    public void testSelectAllUsers() {

        SqlSession sqlSession = sqlSessionFactory.openSession();

        try {

            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

            List<SysUser> sysUserList = userMapper.selectAllUsers();

            Assert.assertNotNull(sysUserList);

            Assert.assertTrue(sysUserList.size() > 0);

            System.out.println(sysUserList.size());

        } finally {

            sqlSession.close();

        }

    }

    @Test

    public void testSelectRolesByUserId() {

        SqlSession sqlSession = sqlSessionFactory.openSession();

        try {

            RoleMapper rolerMapper = sqlSession.getMapper(RoleMapper.class);

            List<SysRole> sysRoleList = rolerMapper.selectRolesByUserId(1L);

            Assert.assertNotNull(sysRoleList);

            Assert.assertTrue(sysRoleList.size() > 0);

            System.out.println(sysRoleList.size());

        } finally {

            sqlSession.close();

        }

    }

}

TestSelectMapper.java

package org.mybatis.example.app;

import java.io.IOException;

import java.io.Reader;

import java.util.Date;

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.BeforeClass;

import org.junit.Test;

import org.mybatis.example.mapper.UserMapper;

import org.mybatis.example.model.SysUser;

public class TestInsertMapper {

    private static SqlSessionFactory sqlSessionFactory;

    @BeforeClass

    public static void init() {

        try {

            Reader reader = Resources.getResourceAsReader("mybatis-config.xml");

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

            reader.close();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    @Test

    public void testInsertAUser() {

        SqlSession sqlSession = sqlSessionFactory.openSession();

        try {

            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

            SysUser sysUser = new SysUser();

            sysUser.setId(2L);

            sysUser.setUserName("test");

            sysUser.setUserPassword("123456");

            sysUser.setUserEmail("test@mybatis.org");

            sysUser.setUserInfo("test info");

            sysUser.setHeadImg(new byte[] {123});

            sysUser.setCreateTime(new Date());

            int insertResult = userMapper.insertAUser(sysUser);

            System.out.println(insertResult);

        } finally {

            //sqlSession.rollback();

            sqlSession.commit();

            sqlSession.close();

        }

    }

    @Test

    public void testInsertAUserWithoutId() {

        SqlSession sqlSession = sqlSessionFactory.openSession();

        try {

            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

            SysUser sysUser = new SysUser();

            sysUser.setUserName("test3");

            sysUser.setUserPassword("123456");

            sysUser.setUserEmail("test3@mybatis.org");

            sysUser.setUserInfo("test3 info");

            sysUser.setCreateTime(new Date());

            int insertResult = userMapper.insertAUser(sysUser);

            System.out.println(insertResult);

        } finally {

            //sqlSession.rollback();

            sqlSession.commit();

            sqlSession.close();

        }

    }

    @Test

    public void testUpdateAUser() {

        SqlSession sqlSession = sqlSessionFactory.openSession();

        try {

            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

            SysUser selectUser = userMapper.selectUserById(1003L);

            selectUser.setUserName("test1003");

            selectUser.setUserEmail("test1003@mybatis.org");

            selectUser.setUserInfo("test1003 info");

            selectUser.setCreateTime(new Date());

            int updateResult = userMapper.updateAUser(selectUser);

            System.out.println(updateResult);

        } finally {

            sqlSession.commit();

            sqlSession.close();

        }

    }

    @Test

    public void testDeleteAUser() {

        SqlSession sqlSession = sqlSessionFactory.openSession();

        try {

            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

            int deleteResult = userMapper.deleteAUser(1003L);

            System.out.println(deleteResult);

        } finally {

            sqlSession.commit();

            sqlSession.close();

        }

    }

}

TestInsertMapper.java

package org.mybatis.example.app;

import java.io.IOException;

import java.io.Reader;

import java.util.List;

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.BeforeClass;

import org.junit.Test;

import org.mybatis.example.mapper.RoleMapper;

import org.mybatis.example.model.SysRole;

public class TestParamMapper {

    private static SqlSessionFactory sqlSessionFactory;

    @BeforeClass

    public static void init() {

        try {

            Reader reader = Resources.getResourceAsReader("mybatis-config.xml");

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

            reader.close();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    @Test

    public void testComplicatedSelect() {

        SqlSession sqlSession = sqlSessionFactory.openSession();

        try {

            RoleMapper roleMapper = sqlSession.getMapper(RoleMapper.class);

            List<SysRole> sysRoleList = roleMapper.selectRolesByUserIdAndRoleEnabled(1L, 1);

            System.out.println(sysRoleList.size());

        } finally {

            sqlSession.close();

        }

    }

}

TestParamMapper.java

当需要传递多个参数的时候，需要用到@Param注解，并且上面的代码中给出了例子：RoleMapper.xml中的SelectRolesByUserIdAndRoleEnabled

需要注意的是，在Mapper.xml中，<mapper>中的属性namespace不能少，之前在学习的过程由于缺少了namespace，导致没有得到正确的结果，排查了半天，才找到原因

四、架构图

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