使用mybatis-generator生成底层

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;

@Component
public 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