本文共 8311 字，大约阅读时间需要 27 分钟。

环境

​ 使用springboot2，jdk1.8，idea

在pom引入相关依赖

<!--mybatise-generator--><plugin>    <groupId>org.mybatis.generator</groupId>    <artifactId>mybatis-generator-maven-plugin</artifactId>    <version>1.3.2</version>    <configuration>        <!--在此处指定配置文件位置-->        <configurationFile>src/main/resources/generatorConfig/generatorConfig.xml</configurationFile>        <verbose>true</verbose>        <overwrite>true</overwrite>    </configuration>    <!--mybatise-generator-->    <dependencies>        <!--在此处引入所需依赖-->        <dependency>            <groupId>org.mybatis.generator</groupId>            <artifactId>mybatis-generator-core</artifactId>            <version>1.3.2</version>        </dependency>        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>            <version>5.1.44</version>        </dependency>    </dependencies></plugin>

注意：

​ mybatis-generator版本如果和mysql差距過大，可能在生成代码的过程中引起报错

在Resource中配置配置文件

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE generatorConfiguration        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"><generatorConfiguration>    <!--注意这里的targetRuntime="MyBatis3Simple"，指定了不生成Example相关内容-->    <context id="MysqlTables" targetRuntime="MyBatis3Simple">        <commentGenerator>            <property name="suppressDate" value="true"/>            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->            <property name="suppressAllComments" value="true"/>        </commentGenerator>        <!-- jdbc链接信息 -->        <jdbcConnection driverClass="com.mysql.jdbc.Driver"                        connectionURL="jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=UTF-8"                        userId="root" password="123456">        </jdbcConnection>        <javaTypeResolver>            <property name="forceBigDecimals" value="false"/>        </javaTypeResolver>        <!-- 生成PO类的位置 -->        <javaModelGenerator targetPackage="com.huang.po"                            targetProject="src/main/java">            <property name="enableSubPackages" value="true"/>            <property name="trimStrings" value="true"/>        </javaModelGenerator>        <!-- mapper映射文件生成的位置 -->        <sqlMapGenerator targetPackage="mapper"                         targetProject="src/main/resources">            <property name="enableSubPackages" value="true"/>        </sqlMapGenerator>        <!-- mapper接口生成的位置 -->        <javaClientGenerator type="XMLMAPPER"                             targetPackage="com.party.community.template"                             targetProject="src/main/java">            <property name="enableSubPackages" value="true"/>        </javaClientGenerator>        <!-- 指定要生成的表，主鍵，po类名 -->        <table tableName="Admins" domainObjectName="Admins">            <property name="useActualColumnNames" value="true"/>            <generatedKey column="a_id" sqlStatement="MySql" identity="true"/>        </table>    </context></generatorConfiguration>

注意：

​ 1.存放生成代码的指定包或者文件夹可以不用提前建好，只要路径没错插件会顺便一起建好

​ 2.根指定路径的不同，部分生成代码可能会需要更改。比如映射配置文件，

​

​ namespace的生成是根据上面的配置而生成的，如果你在生成代码后还想要移动mapper的話，要记得修改对应路径

生成代码

代开Maven菜单，点击Plugins里的mybatis-generator，即可自动生成

目录结构

生成的代码

java代码

package com.party.community.po;import org.springframework.stereotype.Component;import java.util.Date;@Componentpublic class User {    private String u_idcard;    private String u_unsername;    private String u_tel;    private String u_pwd;    private String u_avator;    private String u_sex;    private Date u_birthday;    private String u_history;    private String u_remark;    public String getU_idcard() {        return u_idcard;    }    public void setU_idcard(String u_idcard) {        this.u_idcard = u_idcard == null ? null : u_idcard.trim();    }    public String getU_unsername() {        return u_unsername;    }    public void setU_unsername(String u_unsername) {        this.u_unsername = u_unsername == null ? null : u_unsername.trim();    }    public String getU_tel() {        return u_tel;    }    public void setU_tel(String u_tel) {        this.u_tel = u_tel == null ? null : u_tel.trim();    }    public String getU_pwd() {        return u_pwd;    }    public void setU_pwd(String u_pwd) {        this.u_pwd = u_pwd == null ? null : u_pwd.trim();    }    public String getU_avator() {        return u_avator;    }    public void setU_avator(String u_avator) {        this.u_avator = u_avator == null ? null : u_avator.trim();    }    public String getU_sex() {        return u_sex;    }    public void setU_sex(String u_sex) {        this.u_sex = u_sex == null ? null : u_sex.trim();    }    public Date getU_birthday() {        return u_birthday;    }    public void setU_birthday(Date u_birthday) {        this.u_birthday = u_birthday;    }    public String getU_history() {        return u_history;    }    public void setU_history(String u_history) {        this.u_history = u_history == null ? null : u_history.trim();    }    public String getU_remark() {        return u_remark;    }    public void setU_remark(String u_remark) {        this.u_remark = u_remark == null ? null : u_remark.trim();    }}

生成的po，已写好get和set方法

package com.party.community.mapper;import com.party.community.po.User;import java.util.List;public interface UserMapper {    int deleteByPrimaryKey(String u_idcard);    int insert(User record);    User selectByPrimaryKey(String u_idcard);    List<User> selectAll();    int updateByPrimaryKey(User record);    User selectByPhone(String phone);}

xml映射文件

<?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="com.party.community.mapper.UserMapper" >  <resultMap id="BaseResultMap" type="com.party.community.po.User" >    <id column="u_idcard" property="u_idcard" jdbcType="VARCHAR" />    <result column="u_unsername" property="u_unsername" jdbcType="VARCHAR" />    <result column="u_tel" property="u_tel" jdbcType="VARCHAR" />    <result column="u_pwd" property="u_pwd" jdbcType="VARCHAR" />    <result column="u_avator" property="u_avator" jdbcType="VARCHAR" />    <result column="u_sex" property="u_sex" jdbcType="VARCHAR" />    <result column="u_birthday" property="u_birthday" jdbcType="TIMESTAMP" />    <result column="u_history" property="u_history" jdbcType="VARCHAR" />    <result column="u_remark" property="u_remark" jdbcType="VARCHAR" />  </resultMap>  <delete id="deleteByPrimaryKey" parameterType="java.lang.String" >    delete from user    where u_idcard = #{u_idcard,jdbcType=VARCHAR}  </delete>  <insert id="insert" parameterType="com.party.community.po.User" >    <selectKey resultType="java.lang.String" keyProperty="u_idcard" order="AFTER" >      SELECT LAST_INSERT_ID()    </selectKey>    insert into user (u_unsername, u_tel, u_pwd,       u_avator, u_sex, u_birthday,       u_history, u_remark)    values (#{u_unsername,jdbcType=VARCHAR}, #{u_tel,jdbcType=VARCHAR}, #{u_pwd,jdbcType=VARCHAR},       #{u_avator,jdbcType=VARCHAR}, #{u_sex,jdbcType=VARCHAR}, #{u_birthday,jdbcType=TIMESTAMP},       #{u_history,jdbcType=VARCHAR}, #{u_remark,jdbcType=VARCHAR})  </insert>  <update id="updateByPrimaryKey" parameterType="com.party.community.po.User" >    update user    set u_unsername = #{u_unsername,jdbcType=VARCHAR},      u_tel = #{u_tel,jdbcType=VARCHAR},      u_pwd = #{u_pwd,jdbcType=VARCHAR},      u_avator = #{u_avator,jdbcType=VARCHAR},      u_sex = #{u_sex,jdbcType=VARCHAR},      u_birthday = #{u_birthday,jdbcType=TIMESTAMP},      u_history = #{u_history,jdbcType=VARCHAR},      u_remark = #{u_remark,jdbcType=VARCHAR}    where u_idcard = #{u_idcard,jdbcType=VARCHAR}  </update>  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.String" >    select u_idcard, u_unsername, u_tel, u_pwd, u_avator, u_sex, u_birthday, u_history,     u_remark    from user    where u_idcard = #{u_idcard,jdbcType=VARCHAR}  </select>  <select id="selectAll" resultMap="BaseResultMap" >    select u_idcard, u_unsername, u_tel, u_pwd, u_avator, u_sex, u_birthday, u_history,     u_remark    from user  </select>  <select id="selectByPhone" resultType="User">    select *    from user    where u_tel = #{phone}  </select></mapper>

生成的mapper和映射文件，已经生成了基本的增删改查和根据主键查找的方法