使用idea插件进行java代码生成的操作

java代码生成

使用idea的插件codehelper.generator进行代码生成,可以根据entity,生成对应的

1、建表sql语句

2、dao.java文件

3、dao.xml文件

4、service.java文件

同时这个插件还能在new了entity之后生成所有的set方法

多次生成,不会影响自己手动添加的代码

安装

安装插件codehelper.generator

案例

@Data
@AllArgsConstructor
@NoArgsConstructor
public class UserEntity {
  @Id
  private Integer id;

  private String name;

  /**
   * 1启用,0停用
   */
  private Integer state;

  private String remark;
  @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
  @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
  private Date addtime;
  @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
  @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
  private Date stoptime;
}

生成set

UserEntity user=new UserEntity();

//new了之后在下一行:点击tool--codeHelper--GenAllSetter

生成代码

点击tool--codeHelper--tox Boxes--在弹窗中输入entity,多个使用'|'分隔,就会在当前文件夹生成代码

sql

-- auto Generated on 2020-01-14 12:49:57 
-- DROP TABLE IF EXISTS `user_entity`; 
CREATE TABLE user_entity(
  `id` INTEGER(20) UNSIGNED NOT NULL AUTO_INCREMENT COMMENT 'id',
  `name` VARCHAR(50) NOT NULL DEFAULT '' COMMENT 'name',
  `state` INTEGER(12) NOT NULL DEFAULT -1 COMMENT '1启用,0停用',
  `remark` VARCHAR(50) NOT NULL DEFAULT '' COMMENT 'remark',
  `addtime` DATETIME NOT NULL DEFAULT '1000-01-01 00:00:00' COMMENT 'addtime',
  `stoptime` DATETIME NOT NULL DEFAULT '1000-01-01 00:00:00' COMMENT 'stoptime',
  PRIMARY KEY (`id`)
)ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT 'user_entity';

dao

package com.demo1.invoice.entity.user;
import org.apache.ibatis.annotations.Param;
import java.util.List;
import com.demo1.invoice.entity.user.UserEntity;

public interface UserEntityDao {

  int insert(@Param("pojo") UserEntity pojo);
  int insertList(@Param("pojos") List< UserEntity> pojo);
  List<UserEntity> select(@Param("pojo") UserEntity pojo);
  int update(@Param("pojo") UserEntity pojo);
}

xml

<?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.demo1.invoice.entity.user.UserEntityDao">

<!--auto generated Code-->
  <resultMap id="AllColumnMap" type="com.demo1.invoice.entity.user.UserEntity">
    <result column="id" property="id"/>
    <result column="name" property="name"/>
    <result column="state" property="state"/>
    <result column="remark" property="remark"/>
    <result column="addtime" property="addtime"/>
    <result column="stoptime" property="stoptime"/>
  </resultMap>

<!--auto generated Code-->
  <sql id="all_column">
    id,
    name,
    state,
    remark,
    addtime,
    stoptime
  </sql>

<!--auto generated Code-->
  <insert id="insert">
    INSERT INTO user_entity
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="pojo.id != null"> id, </if>
      <if test="pojo.name != null"> name, </if>
      <if test="pojo.state != null"> state, </if>
      <if test="pojo.remark != null"> remark, </if>
      <if test="pojo.addtime != null"> addtime, </if>
      <if test="pojo.stoptime != null"> stoptime, </if>
    </trim>
    VALUES
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="pojo.id != null"> #{pojo.id}, </if>
      <if test="pojo.name != null"> #{pojo.name}, </if>
      <if test="pojo.state != null"> #{pojo.state}, </if>
      <if test="pojo.remark != null"> #{pojo.remark}, </if>
      <if test="pojo.addtime != null"> #{pojo.addtime}, </if>
      <if test="pojo.stoptime != null"> #{pojo.stoptime}, </if>
    </trim>
  </insert>

<!--auto generated Code-->
  <insert id="insertList">
    INSERT INTO user_entity(
    <include refid="all_column"/>
    )VALUES
    <foreach collection="pojos" item="pojo" index="index" separator=",">
      (
      #{pojo.id},
      #{pojo.name},
      #{pojo.state},
      #{pojo.remark},
      #{pojo.addtime},
      #{pojo.stoptime}
      )
    </foreach>
  </insert>

<!--auto generated Code-->
  <update id="update">
    UPDATE user_entity
    <set>
      <if test="pojo.id != null"> id = #{pojo.id}, </if>
      <if test="pojo.name != null"> name = #{pojo.name}, </if>
      <if test="pojo.state != null"> state = #{pojo.state}, </if>
      <if test="pojo.remark != null"> remark = #{pojo.remark}, </if>
      <if test="pojo.addtime != null"> addtime = #{pojo.addtime}, </if>
      <if test="pojo.stoptime != null"> stoptime = #{pojo.stoptime} </if>
    </set>
     WHERE id = #{pojo.id}
  </update>

<!--auto generated Code-->
  <select id="select" resultMap="AllColumnMap">
    SELECT <include refid="all_column"/>
    FROM user_entity
    <where>
      <if test="pojo.id != null"> AND id = #{pojo.id} </if>
      <if test="pojo.name != null"> AND name = #{pojo.name} </if>
      <if test="pojo.state != null"> AND state = #{pojo.state} </if>
      <if test="pojo.remark != null"> AND remark = #{pojo.remark} </if>
      <if test="pojo.addtime != null"> AND addtime = #{pojo.addtime} </if>
      <if test="pojo.stoptime != null"> AND stoptime = #{pojo.stoptime} </if>
    </where>
    LIMIT 1000 
  </select>

<!--auto generated Code-->
  <delete id="delete">
    DELETE FROM user_entity where id = #{id}
  </delete>
</mapper>

service

import org.springframework.stereotype.Service;
import javax.annotation.Resource;
import java.util.List;
import com.demo1.invoice.entity.user.UserEntity;
import com.demo1.invoice.entity.user.UserEntityDao;

@Service
public class UserEntityService {

  @Resource
  private UserEntityDao userEntityDao;

  public int insert(UserEntity pojo){
    return userEntityDao.insert(pojo);
  }

  public int insertList(List< UserEntity> pojos){
    return userEntityDao.insertList(pojos);
  }

  public List<UserEntity> select(UserEntity pojo){
    return userEntityDao.select(pojo);
  }

  public int update(UserEntity pojo){
    return userEntityDao.update(pojo);
  }

}

补充知识：IDEA 新建junit单元测试

1. 新建test目录

在src同级目录下新建test文件夹，右键test文件夹设置为Test Source Root

2. 创建测试类

选中要创建单元测试的实现类，并将焦点放在编辑器中（鼠标在编辑器中点击一下），菜单栏选择Navigate----Test（Mac快捷键：Cmd+shift+t）：

选择创建新的测试：

选中要测试的方法，以及生成@Before：

这样之后就会在test下新建一个测试类：

3. 测试函数介绍

测试类中包含两个函数：

@Before

public void setUp() throws Exception

这个是测试方法执行前执行的函数，假如在测试方法中需要使用该类中的成员变量，那么可以在该函数中定义该成员变量。

@Test

public void findUserById() throws Exception

这个便是测试函数。点击编辑器左列的小工具即可发起测试。

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