spring boot集成mybatis框架

概述

• 中文官网：http://www.mybatis.cn
• 参考教程：https://www.w3cschool.cn/mybatis
• MyBatis Plus：http://mp.baomidou.com/#/quick-start
• 主要步骤：添加配置、生成MyBatis模板、编写服务接口、配置打包资源、编译运行测试

原理概述

程序连接数据库，反向生成程序模板。所以，要提前准备好数据库以及连接数据库的代码。

 

 

添加依赖

mybatis-spring-boot-starter，最新的版本到几就填写几，2020-05-02的版本如下：

https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter/2.1.2

 

<!-- mybatis -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.2</version>
        </dependency>
        <!-- mysql -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

数据源配置

适用于Mysql5.7及以下版本，mysql8.0要使用另外的配置

spring:
  datasource:
    driverClassName: com.mysql.jdbc.Driver
    url: jdbc:mysql://192.168.177.67:3316/dbmng?useUnicode=true&zeroDateTimeBehavior=convertToNull&autoReconnect=true&characterEncoding=utf-8
    username: automng
    password: Automng_123

mysql8.0连接配置，不使用SSL，同时指定时区

server:
  port: 9100
spring:
  datasource:
    #com.mysql.jdbc.Driver
    driverClassName: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/dbmng?useUnicode=true&characterEncoding=utf-8&autoReconnect=true&useSSL=false&zeroDateTimeBehavior=convertToNull&serverTimezone=Asia/Shanghai
    username: automng
    password: Automng_123

mybatis架构

定义interface，xml映射关系，然后通过配置类建立他们之间的实现。

mybatis在项目中的位置，提供JDBC底层服务，业务调用mybatis方法，然后对外提供服务

创建一个Java实体类

创建创建一个XML配置文件，通过XML配置文件关联实体类属性与数据库字段

定义一个实体类对应的接口

配置mybatis，将实体类接口转化为实现类

配置一套业务接口与实现类，通过spring注解注入mybatis实现类

定义一套控制类，通过spring注解注入业务接口，对外提供服务

 添加配置类

添加MyBatis配置类，dao/model/xml等扫描，同时从spring bean 容器加载数据源

进而建立model与mapper映射文件的联系，再通过接口对外提供数据库服务

MapperScan注解将对应的接口转化为实现类

package cn.itoracle.dbmng.config;

import javax.sql.DataSource;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

/**
 * MyBais配置类
 * @author tan
 * @version May 2, 2020 6:11:22 PM
 */
@Configuration
@MapperScan("cn.itoracle.dbmng.**.dao")    // 扫描DAO
public class MyBatisConfig {

    @Autowired
    private DataSource dataSource;

    @Bean
    public SqlSessionFactory sqlSessionFactory() throws Exception {
    SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
    sessionFactory.setDataSource(dataSource);
    sessionFactory.setTypeAliasesPackage("cn.itoracle.dbmng.**.model");    // 扫描Model

    PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
    sessionFactory.setMapperLocations(resolver.getResources("classpath*:**/sqlmap/*.xml"));    // 扫描映射文件

    return sessionFactory.getObject();
    }
}

 dao接口

 

package cn.itoracle.dbmng.dao;

import java.util.List;

import cn.itoracle.dbmng.model.SysUser;

public interface SysUserMapper {
    int deleteByPrimaryKey(Long id);

    int insert(SysUser record);

    int insertSelective(SysUser record);

    SysUser selectByPrimaryKey(Long id);

    int updateByPrimaryKeySelective(SysUser record);

    int updateByPrimaryKey(SysUser record);

    /**
     * 查询全部
     * @return
     */
    List<SysUser> findAll();
}

model类

package cn.itoracle.dbmng.model;

import java.util.Date;

public class SysUser {
    private Long id;

    private String name;

    private String nickName;

    private String avatar;

    private String password;

    private String salt;

    private String email;

    private String mobile;

    private Byte status;

    private Long deptId;

    private String createBy;

    private Date createTime;

    private String lastUpdateBy;

    private Date lastUpdateTime;

    private Byte delFlag;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name == null ? null : name.trim();
    }

    public String getNickName() {
        return nickName;
    }

    public void setNickName(String nickName) {
        this.nickName = nickName == null ? null : nickName.trim();
    }

    public String getAvatar() {
        return avatar;
    }

    public void setAvatar(String avatar) {
        this.avatar = avatar == null ? null : avatar.trim();
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password == null ? null : password.trim();
    }

    public String getSalt() {
        return salt;
    }

    public void setSalt(String salt) {
        this.salt = salt == null ? null : salt.trim();
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email == null ? null : email.trim();
    }

    public String getMobile() {
        return mobile;
    }

    public void setMobile(String mobile) {
        this.mobile = mobile == null ? null : mobile.trim();
    }

    public Byte getStatus() {
        return status;
    }

    public void setStatus(Byte status) {
        this.status = status;
    }

    public Long getDeptId() {
        return deptId;
    }

    public void setDeptId(Long deptId) {
        this.deptId = deptId;
    }

    public String getCreateBy() {
        return createBy;
    }

    public void setCreateBy(String createBy) {
        this.createBy = createBy == null ? null : createBy.trim();
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    public String getLastUpdateBy() {
        return lastUpdateBy;
    }

    public void setLastUpdateBy(String lastUpdateBy) {
        this.lastUpdateBy = lastUpdateBy == null ? null : lastUpdateBy.trim();
    }

    public Date getLastUpdateTime() {
        return lastUpdateTime;
    }

    public void setLastUpdateTime(Date lastUpdateTime) {
        this.lastUpdateTime = lastUpdateTime;
    }

    public Byte getDelFlag() {
        return delFlag;
    }

    public void setDelFlag(Byte delFlag) {
        this.delFlag = delFlag;
    }
}

mapper映射文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://www.mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.itoracle.dbmng.dao.SysUserMapper">
  <resultMap id="BaseResultMap" type="cn.itoracle.dbmng.model.SysUser">
    <id column="id" jdbcType="BIGINT" property="id" />
    <result column="name" jdbcType="VARCHAR" property="name" />
    <result column="nick_name" jdbcType="VARCHAR" property="nickName" />
    <result column="avatar" jdbcType="VARCHAR" property="avatar" />
    <result column="password" jdbcType="VARCHAR" property="password" />
    <result column="salt" jdbcType="VARCHAR" property="salt" />
    <result column="email" jdbcType="VARCHAR" property="email" />
    <result column="mobile" jdbcType="VARCHAR" property="mobile" />
    <result column="status" jdbcType="TINYINT" property="status" />
    <result column="dept_id" jdbcType="BIGINT" property="deptId" />
    <result column="create_by" jdbcType="VARCHAR" property="createBy" />
    <result column="create_time" jdbcType="TIMESTAMP" property="createTime" />
    <result column="last_update_by" jdbcType="VARCHAR" property="lastUpdateBy" />
    <result column="last_update_time" jdbcType="TIMESTAMP" property="lastUpdateTime" />
    <result column="del_flag" jdbcType="TINYINT" property="delFlag" />
  </resultMap>
  <sql id="Base_Column_List">
    id, name, nick_name, avatar, password, salt, email, mobile, status, dept_id, create_by,
    create_time, last_update_by, last_update_time, del_flag
  </sql>
  <select id="selectByPrimaryKey" parameterType="java.lang.Long" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from sys_user
    where id = #{id,jdbcType=BIGINT}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Long">
    delete from sys_user
    where id = #{id,jdbcType=BIGINT}
  </delete>
  <insert id="insert" parameterType="cn.itoracle.dbmng.model.SysUser">
    insert into sys_user (id, name, nick_name,
      avatar, password, salt,
      email, mobile, status,
      dept_id, create_by, create_time,
      last_update_by, last_update_time, del_flag
      )
    values (#{id,jdbcType=BIGINT}, #{name,jdbcType=VARCHAR}, #{nickName,jdbcType=VARCHAR},
      #{avatar,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, #{salt,jdbcType=VARCHAR},
      #{email,jdbcType=VARCHAR}, #{mobile,jdbcType=VARCHAR}, #{status,jdbcType=TINYINT},
      #{deptId,jdbcType=BIGINT}, #{createBy,jdbcType=VARCHAR}, #{createTime,jdbcType=TIMESTAMP},
      #{lastUpdateBy,jdbcType=VARCHAR}, #{lastUpdateTime,jdbcType=TIMESTAMP}, #{delFlag,jdbcType=TINYINT}
      )
  </insert>
  <insert id="insertSelective" parameterType="cn.itoracle.dbmng.model.SysUser">
    insert into sys_user
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="id != null">
        id,
      </if>
      <if test="name != null">
        name,
      </if>
      <if test="nickName != null">
        nick_name,
      </if>
      <if test="avatar != null">
        avatar,
      </if>
      <if test="password != null">
        password,
      </if>
      <if test="salt != null">
        salt,
      </if>
      <if test="email != null">
        email,
      </if>
      <if test="mobile != null">
        mobile,
      </if>
      <if test="status != null">
        status,
      </if>
      <if test="deptId != null">
        dept_id,
      </if>
      <if test="createBy != null">
        create_by,
      </if>
      <if test="createTime != null">
        create_time,
      </if>
      <if test="lastUpdateBy != null">
        last_update_by,
      </if>
      <if test="lastUpdateTime != null">
        last_update_time,
      </if>
      <if test="delFlag != null">
        del_flag,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
      <if test="id != null">
        #{id,jdbcType=BIGINT},
      </if>
      <if test="name != null">
        #{name,jdbcType=VARCHAR},
      </if>
      <if test="nickName != null">
        #{nickName,jdbcType=VARCHAR},
      </if>
      <if test="avatar != null">
        #{avatar,jdbcType=VARCHAR},
      </if>
      <if test="password != null">
        #{password,jdbcType=VARCHAR},
      </if>
      <if test="salt != null">
        #{salt,jdbcType=VARCHAR},
      </if>
      <if test="email != null">
        #{email,jdbcType=VARCHAR},
      </if>
      <if test="mobile != null">
        #{mobile,jdbcType=VARCHAR},
      </if>
      <if test="status != null">
        #{status,jdbcType=TINYINT},
      </if>
      <if test="deptId != null">
        #{deptId,jdbcType=BIGINT},
      </if>
      <if test="createBy != null">
        #{createBy,jdbcType=VARCHAR},
      </if>
      <if test="createTime != null">
        #{createTime,jdbcType=TIMESTAMP},
      </if>
      <if test="lastUpdateBy != null">
        #{lastUpdateBy,jdbcType=VARCHAR},
      </if>
      <if test="lastUpdateTime != null">
        #{lastUpdateTime,jdbcType=TIMESTAMP},
      </if>
      <if test="delFlag != null">
        #{delFlag,jdbcType=TINYINT},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="cn.itoracle.dbmng.model.SysUser">
    update sys_user
    <set>
      <if test="name != null">
        name = #{name,jdbcType=VARCHAR},
      </if>
      <if test="nickName != null">
        nick_name = #{nickName,jdbcType=VARCHAR},
      </if>
      <if test="avatar != null">
        avatar = #{avatar,jdbcType=VARCHAR},
      </if>
      <if test="password != null">
        password = #{password,jdbcType=VARCHAR},
      </if>
      <if test="salt != null">
        salt = #{salt,jdbcType=VARCHAR},
      </if>
      <if test="email != null">
        email = #{email,jdbcType=VARCHAR},
      </if>
      <if test="mobile != null">
        mobile = #{mobile,jdbcType=VARCHAR},
      </if>
      <if test="status != null">
        status = #{status,jdbcType=TINYINT},
      </if>
      <if test="deptId != null">
        dept_id = #{deptId,jdbcType=BIGINT},
      </if>
      <if test="createBy != null">
        create_by = #{createBy,jdbcType=VARCHAR},
      </if>
      <if test="createTime != null">
        create_time = #{createTime,jdbcType=TIMESTAMP},
      </if>
      <if test="lastUpdateBy != null">
        last_update_by = #{lastUpdateBy,jdbcType=VARCHAR},
      </if>
      <if test="lastUpdateTime != null">
        last_update_time = #{lastUpdateTime,jdbcType=TIMESTAMP},
      </if>
      <if test="delFlag != null">
        del_flag = #{delFlag,jdbcType=TINYINT},
      </if>
    </set>
    where id = #{id,jdbcType=BIGINT}
  </update>
  <update id="updateByPrimaryKey" parameterType="cn.itoracle.dbmng.model.SysUser">
    update sys_user
    set name = #{name,jdbcType=VARCHAR},
      nick_name = #{nickName,jdbcType=VARCHAR},
      avatar = #{avatar,jdbcType=VARCHAR},
      password = #{password,jdbcType=VARCHAR},
      salt = #{salt,jdbcType=VARCHAR},
      email = #{email,jdbcType=VARCHAR},
      mobile = #{mobile,jdbcType=VARCHAR},
      status = #{status,jdbcType=TINYINT},
      dept_id = #{deptId,jdbcType=BIGINT},
      create_by = #{createBy,jdbcType=VARCHAR},
      create_time = #{createTime,jdbcType=TIMESTAMP},
      last_update_by = #{lastUpdateBy,jdbcType=VARCHAR},
      last_update_time = #{lastUpdateTime,jdbcType=TIMESTAMP},
      del_flag = #{delFlag,jdbcType=TINYINT}
    where id = #{id,jdbcType=BIGINT}
  </update>
  <select id="findAll" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from sys_user
  </select>
</mapper>

 

 

打包时带上映射文件

<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
        <!-- 打包时拷贝MyBatis的映射文件 -->
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/sqlmap/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                    <filtering>true</filtering>
            </resource>
        </resources>
    </build>

 

 

 

遇到问题

error while downloading 'http://mybatis.org/dtd/mybatis-3-mapper.dtd' to

解决方法：

"http://mybatis.org/dt --> "http://www.mybatis.org/