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/

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spring boot集成mybatis框架

概述

遇到问题

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