一：MyBatis的逆向⼯程

（1）所谓的逆向⼯程是：根据数据库表逆向⽣成Java的pojo类，SqlMapper.xml⽂件，以及Mapper接⼝类等，这真是一个很强大的功能。要完成这个⼯作，需要借助别⼈写好的逆向⼯程插件。

（2）思考：使⽤这个插件的话，需要给这个插件配置哪些信息？

①pojo类名、包名以及⽣成位置。

②SqlMapper.xml⽂件名以及⽣成位置。

③Mapper接⼝名以及⽣成位置。

④连接数据库的信息。

⑤指定哪些表参与逆向⼯程。

......

1. 逆向⼯程配置与⽣成

（1）基础环境准备

新建一个普通的Maven模块：mybatis-012-generator

打包⽅式：jar

（2）在pom.xml中添加逆向⼯程插件

①先引入mybatis逆向⼯程的插件，引入仓库中对应的插件坐标。

②允许覆盖：表示原来这些文件存在，true就以覆盖的方式生成文件，false就以追加的方式生成文件。

③引入插件的依赖：我们需要根据数据库表逆向生成pojo类、SqlMapper接口和里面的方法、SqlMapper.xml配置文件等，所以肯定需要mysql的驱动。


4.0.0com.bjpowernodemybatis-012-generator1.0-SNAPSHOTjarorg.mybatis.generatormybatis-generator-maven-plugin1.4.1truemysqlmysql-connector-java5.1.23

（3）配置generatorConfig.xml（基础版）

该⽂件名必须叫做：generatorConfig.xml。

并且该⽂件必须放在类的根路径下。


 （4）双击运行插件，就可以生成基础版的配置信息
自动生成的CarMapper接口、pojo类Car、CarMapper.xml配置文件
 CarMapper接口
package com.bjpowernode.mybatis.mapper;import com.bjpowernode.mybatis.pojo.Car;
import java.util.List;public interface CarMapper {int deleteByPrimaryKey(Long id);int insert(Car row);Car selectByPrimaryKey(Long id);List selectAll();int updateByPrimaryKey(Car row);
}
pojo类Car
注：生成的pojo类并没有重写toString方法
package com.bjpowernode.mybatis.pojo;import java.math.BigDecimal;public class Car {private Long id;private String carNum;private String brand;private BigDecimal guidePrice;private String produceTime;private String carType;@Overridepublic String toString() {return "Car{" +"id=" + id +", carNum='" + carNum + '\'' +", brand='" + brand + '\'' +", guidePrice=" + guidePrice +", produceTime='" + produceTime + '\'' +", carType='" + carType + '\'' +'}';}public Long getId() {return id;}public void setId(Long id) {this.id = id;}public String getCarNum() {return carNum;}public void setCarNum(String carNum) {this.carNum = carNum == null ? null : carNum.trim();}public String getBrand() {return brand;}public void setBrand(String brand) {this.brand = brand == null ? null : brand.trim();}public BigDecimal getGuidePrice() {return guidePrice;}public void setGuidePrice(BigDecimal guidePrice) {this.guidePrice = guidePrice;}public String getProduceTime() {return produceTime;}public void setProduceTime(String produceTime) {this.produceTime = produceTime == null ? null : produceTime.trim();}public String getCarType() {return carType;}public void setCarType(String carType) {this.carType = carType == null ? null : carType.trim();}
}
CarMapper.xml配置文件


delete from t_carwhere id = #{id,jdbcType=BIGINT}insert into t_car (id, car_num, brand, guide_price, produce_time, car_type)values (#{id,jdbcType=BIGINT}, #{carNum,jdbcType=VARCHAR}, #{brand,jdbcType=VARCHAR}, #{guidePrice,jdbcType=DECIMAL}, #{produceTime,jdbcType=CHAR}, #{carType,jdbcType=VARCHAR})update t_carset car_num = #{carNum,jdbcType=VARCHAR},brand = #{brand,jdbcType=VARCHAR},guide_price = #{guidePrice,jdbcType=DECIMAL},produce_time = #{produceTime,jdbcType=CHAR},car_type = #{carType,jdbcType=VARCHAR}where id = #{id,jdbcType=BIGINT}
2. 测试生成的逆向⼯程
（1）环境准备
 ①依赖：mybatis依赖、mysql驱动依赖、junit依赖、logback依赖
 ②jdbc.properties、mybatis-config.xml、logback.xml
 ③拷贝工具类：SqlSessionUtil 
（2）编写测试程序（基础版）
package com.bjpowernode.mybatis.test;import com.bjpowernode.mybatis.mapper.CarMapper;
import com.bjpowernode.mybatis.pojo.Car;
import com.bjpowernode.mybatis.utils.SqlSessionUtil;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;import java.util.List;public class CarMapperTest {@Testpublic void testSelectAll(){SqlSession sqlSession = SqlSessionUtil.openSession();CarMapper mapper = sqlSession.getMapper(CarMapper.class);List cars = mapper.selectAll();cars.forEach(car -> System.out.println(car));sqlSession.close();}
}
执行结果：
 （3）配置generatorConfig.xml（增强版）
 生成了两个pojo类，并且对于接口中的方法也变多了
 CarMapper接口
package com.bjpowernode.mybatis.mapper;import com.bjpowernode.mybatis.pojo.Car;
import com.bjpowernode.mybatis.pojo.CarExample;
import java.util.List;
import org.apache.ibatis.annotations.Param;public interface CarMapper {long countByExample(CarExample example);int deleteByExample(CarExample example);int deleteByPrimaryKey(Long id);int insert(Car row);int insertSelective(Car row);List selectByExample(CarExample example);Car selectByPrimaryKey(Long id);int updateByExampleSelective(@Param("row") Car row, @Param("example") CarExample example);int updateByExample(@Param("row") Car row, @Param("example") CarExample example);int updateByPrimaryKeySelective(Car row);int updateByPrimaryKey(Car row);
}
pojo类Car
package com.bjpowernode.mybatis.pojo;import java.math.BigDecimal;public class Car {private Long id;private String carNum;private String brand;private BigDecimal guidePrice;private String produceTime;private String carType;@Overridepublic String toString() {return "Car{" +"id=" + id +", carNum='" + carNum + '\'' +", brand='" + brand + '\'' +", guidePrice=" + guidePrice +", produceTime='" + produceTime + '\'' +", carType='" + carType + '\'' +'}';}public Long getId() {return id;}public void setId(Long id) {this.id = id;}public String getCarNum() {return carNum;}public void setCarNum(String carNum) {this.carNum = carNum == null ? null : carNum.trim();}public String getBrand() {return brand;}public void setBrand(String brand) {this.brand = brand == null ? null : brand.trim();}public BigDecimal getGuidePrice() {return guidePrice;}public void setGuidePrice(BigDecimal guidePrice) {this.guidePrice = guidePrice;}public String getProduceTime() {return produceTime;}public void setProduceTime(String produceTime) {this.produceTime = produceTime == null ? null : produceTime.trim();}public String getCarType() {return carType;}public void setCarType(String carType) {this.carType = carType == null ? null : carType.trim();}
}
pojo类CarExample：封装查询条件的类
package com.bjpowernode.mybatis.pojo;import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;public class CarExample {protected String orderByClause;protected boolean distinct;protected List oredCriteria;public CarExample() {oredCriteria = new ArrayList<>();}public void setOrderByClause(String orderByClause) {this.orderByClause = orderByClause;}public String getOrderByClause() {return orderByClause;}public void setDistinct(boolean distinct) {this.distinct = distinct;}public boolean isDistinct() {return distinct;}public List getOredCriteria() {return oredCriteria;}public void or(Criteria criteria) {oredCriteria.add(criteria);}public Criteria or() {Criteria criteria = createCriteriaInternal();oredCriteria.add(criteria);return criteria;}public Criteria createCriteria() {Criteria criteria = createCriteriaInternal();if (oredCriteria.size() == 0) {oredCriteria.add(criteria);}return criteria;}protected Criteria createCriteriaInternal() {Criteria criteria = new Criteria();return criteria;}public void clear() {oredCriteria.clear();orderByClause = null;distinct = false;}protected abstract static class GeneratedCriteria {protected List criteria;protected GeneratedCriteria() {super();criteria = new ArrayList<>();}public boolean isValid() {return criteria.size() > 0;}public List getAllCriteria() {return criteria;}public List getCriteria() {return criteria;}protected void addCriterion(String condition) {if (condition == null) {throw new RuntimeException("Value for condition cannot be null");}criteria.add(new Criterion(condition));}protected void addCriterion(String condition, Object value, String property) {if (value == null) {throw new RuntimeException("Value for " + property + " cannot be null");}criteria.add(new Criterion(condition, value));}protected void addCriterion(String condition, Object value1, Object value2, String property) {if (value1 == null || value2 == null) {throw new RuntimeException("Between values for " + property + " cannot be null");}criteria.add(new Criterion(condition, value1, value2));}public Criteria andIdIsNull() {addCriterion("id is null");return (Criteria) this;}public Criteria andIdIsNotNull() {addCriterion("id is not null");return (Criteria) this;}public Criteria andIdEqualTo(Long value) {addCriterion("id =", value, "id");return (Criteria) this;}public Criteria andIdNotEqualTo(Long value) {addCriterion("id <>", value, "id");return (Criteria) this;}public Criteria andIdGreaterThan(Long value) {addCriterion("id >", value, "id");return (Criteria) this;}public Criteria andIdGreaterThanOrEqualTo(Long value) {addCriterion("id >=", value, "id");return (Criteria) this;}public Criteria andIdLessThan(Long value) {addCriterion("id <", value, "id");return (Criteria) this;}public Criteria andIdLessThanOrEqualTo(Long value) {addCriterion("id <=", value, "id");return (Criteria) this;}public Criteria andIdIn(List values) {addCriterion("id in", values, "id");return (Criteria) this;}public Criteria andIdNotIn(List values) {addCriterion("id not in", values, "id");return (Criteria) this;}public Criteria andIdBetween(Long value1, Long value2) {addCriterion("id between", value1, value2, "id");return (Criteria) this;}public Criteria andIdNotBetween(Long value1, Long value2) {addCriterion("id not between", value1, value2, "id");return (Criteria) this;}public Criteria andCarNumIsNull() {addCriterion("car_num is null");return (Criteria) this;}public Criteria andCarNumIsNotNull() {addCriterion("car_num is not null");return (Criteria) this;}public Criteria andCarNumEqualTo(String value) {addCriterion("car_num =", value, "carNum");return (Criteria) this;}public Criteria andCarNumNotEqualTo(String value) {addCriterion("car_num <>", value, "carNum");return (Criteria) this;}public Criteria andCarNumGreaterThan(String value) {addCriterion("car_num >", value, "carNum");return (Criteria) this;}public Criteria andCarNumGreaterThanOrEqualTo(String value) {addCriterion("car_num >=", value, "carNum");return (Criteria) this;}public Criteria andCarNumLessThan(String value) {addCriterion("car_num <", value, "carNum");return (Criteria) this;}public Criteria andCarNumLessThanOrEqualTo(String value) {addCriterion("car_num <=", value, "carNum");return (Criteria) this;}public Criteria andCarNumLike(String value) {addCriterion("car_num like", value, "carNum");return (Criteria) this;}public Criteria andCarNumNotLike(String value) {addCriterion("car_num not like", value, "carNum");return (Criteria) this;}public Criteria andCarNumIn(List values) {addCriterion("car_num in", values, "carNum");return (Criteria) this;}public Criteria andCarNumNotIn(List values) {addCriterion("car_num not in", values, "carNum");return (Criteria) this;}public Criteria andCarNumBetween(String value1, String value2) {addCriterion("car_num between", value1, value2, "carNum");return (Criteria) this;}public Criteria andCarNumNotBetween(String value1, String value2) {addCriterion("car_num not between", value1, value2, "carNum");return (Criteria) this;}public Criteria andBrandIsNull() {addCriterion("brand is null");return (Criteria) this;}public Criteria andBrandIsNotNull() {addCriterion("brand is not null");return (Criteria) this;}public Criteria andBrandEqualTo(String value) {addCriterion("brand =", value, "brand");return (Criteria) this;}public Criteria andBrandNotEqualTo(String value) {addCriterion("brand <>", value, "brand");return (Criteria) this;}public Criteria andBrandGreaterThan(String value) {addCriterion("brand >", value, "brand");return (Criteria) this;}public Criteria andBrandGreaterThanOrEqualTo(String value) {addCriterion("brand >=", value, "brand");return (Criteria) this;}public Criteria andBrandLessThan(String value) {addCriterion("brand <", value, "brand");return (Criteria) this;}public Criteria andBrandLessThanOrEqualTo(String value) {addCriterion("brand <=", value, "brand");return (Criteria) this;}public Criteria andBrandLike(String value) {addCriterion("brand like", value, "brand");return (Criteria) this;}public Criteria andBrandNotLike(String value) {addCriterion("brand not like", value, "brand");return (Criteria) this;}public Criteria andBrandIn(List values) {addCriterion("brand in", values, "brand");return (Criteria) this;}public Criteria andBrandNotIn(List values) {addCriterion("brand not in", values, "brand");return (Criteria) this;}public Criteria andBrandBetween(String value1, String value2) {addCriterion("brand between", value1, value2, "brand");return (Criteria) this;}public Criteria andBrandNotBetween(String value1, String value2) {addCriterion("brand not between", value1, value2, "brand");return (Criteria) this;}public Criteria andGuidePriceIsNull() {addCriterion("guide_price is null");return (Criteria) this;}public Criteria andGuidePriceIsNotNull() {addCriterion("guide_price is not null");return (Criteria) this;}public Criteria andGuidePriceEqualTo(BigDecimal value) {addCriterion("guide_price =", value, "guidePrice");return (Criteria) this;}public Criteria andGuidePriceNotEqualTo(BigDecimal value) {addCriterion("guide_price <>", value, "guidePrice");return (Criteria) this;}public Criteria andGuidePriceGreaterThan(BigDecimal value) {addCriterion("guide_price >", value, "guidePrice");return (Criteria) this;}public Criteria andGuidePriceGreaterThanOrEqualTo(BigDecimal value) {addCriterion("guide_price >=", value, "guidePrice");return (Criteria) this;}public Criteria andGuidePriceLessThan(BigDecimal value) {addCriterion("guide_price <", value, "guidePrice");return (Criteria) this;}public Criteria andGuidePriceLessThanOrEqualTo(BigDecimal value) {addCriterion("guide_price <=", value, "guidePrice");return (Criteria) this;}public Criteria andGuidePriceIn(List values) {addCriterion("guide_price in", values, "guidePrice");return (Criteria) this;}public Criteria andGuidePriceNotIn(List values) {addCriterion("guide_price not in", values, "guidePrice");return (Criteria) this;}public Criteria andGuidePriceBetween(BigDecimal value1, BigDecimal value2) {addCriterion("guide_price between", value1, value2, "guidePrice");return (Criteria) this;}public Criteria andGuidePriceNotBetween(BigDecimal value1, BigDecimal value2) {addCriterion("guide_price not between", value1, value2, "guidePrice");return (Criteria) this;}public Criteria andProduceTimeIsNull() {addCriterion("produce_time is null");return (Criteria) this;}public Criteria andProduceTimeIsNotNull() {addCriterion("produce_time is not null");return (Criteria) this;}public Criteria andProduceTimeEqualTo(String value) {addCriterion("produce_time =", value, "produceTime");return (Criteria) this;}public Criteria andProduceTimeNotEqualTo(String value) {addCriterion("produce_time <>", value, "produceTime");return (Criteria) this;}public Criteria andProduceTimeGreaterThan(String value) {addCriterion("produce_time >", value, "produceTime");return (Criteria) this;}public Criteria andProduceTimeGreaterThanOrEqualTo(String value) {addCriterion("produce_time >=", value, "produceTime");return (Criteria) this;}public Criteria andProduceTimeLessThan(String value) {addCriterion("produce_time <", value, "produceTime");return (Criteria) this;}public Criteria andProduceTimeLessThanOrEqualTo(String value) {addCriterion("produce_time <=", value, "produceTime");return (Criteria) this;}public Criteria andProduceTimeLike(String value) {addCriterion("produce_time like", value, "produceTime");return (Criteria) this;}public Criteria andProduceTimeNotLike(String value) {addCriterion("produce_time not like", value, "produceTime");return (Criteria) this;}public Criteria andProduceTimeIn(List values) {addCriterion("produce_time in", values, "produceTime");return (Criteria) this;}public Criteria andProduceTimeNotIn(List values) {addCriterion("produce_time not in", values, "produceTime");return (Criteria) this;}public Criteria andProduceTimeBetween(String value1, String value2) {addCriterion("produce_time between", value1, value2, "produceTime");return (Criteria) this;}public Criteria andProduceTimeNotBetween(String value1, String value2) {addCriterion("produce_time not between", value1, value2, "produceTime");return (Criteria) this;}public Criteria andCarTypeIsNull() {addCriterion("car_type is null");return (Criteria) this;}public Criteria andCarTypeIsNotNull() {addCriterion("car_type is not null");return (Criteria) this;}public Criteria andCarTypeEqualTo(String value) {addCriterion("car_type =", value, "carType");return (Criteria) this;}public Criteria andCarTypeNotEqualTo(String value) {addCriterion("car_type <>", value, "carType");return (Criteria) this;}public Criteria andCarTypeGreaterThan(String value) {addCriterion("car_type >", value, "carType");return (Criteria) this;}public Criteria andCarTypeGreaterThanOrEqualTo(String value) {addCriterion("car_type >=", value, "carType");return (Criteria) this;}public Criteria andCarTypeLessThan(String value) {addCriterion("car_type <", value, "carType");return (Criteria) this;}public Criteria andCarTypeLessThanOrEqualTo(String value) {addCriterion("car_type <=", value, "carType");return (Criteria) this;}public Criteria andCarTypeLike(String value) {addCriterion("car_type like", value, "carType");return (Criteria) this;}public Criteria andCarTypeNotLike(String value) {addCriterion("car_type not like", value, "carType");return (Criteria) this;}public Criteria andCarTypeIn(List values) {addCriterion("car_type in", values, "carType");return (Criteria) this;}public Criteria andCarTypeNotIn(List values) {addCriterion("car_type not in", values, "carType");return (Criteria) this;}public Criteria andCarTypeBetween(String value1, String value2) {addCriterion("car_type between", value1, value2, "carType");return (Criteria) this;}public Criteria andCarTypeNotBetween(String value1, String value2) {addCriterion("car_type not between", value1, value2, "carType");return (Criteria) this;}}public static class Criteria extends GeneratedCriteria {protected Criteria() {super();}}public static class Criterion {private String condition;private Object value;private Object secondValue;private boolean noValue;private boolean singleValue;private boolean betweenValue;private boolean listValue;private String typeHandler;public String getCondition() {return condition;}public Object getValue() {return value;}public Object getSecondValue() {return secondValue;}public boolean isNoValue() {return noValue;}public boolean isSingleValue() {return singleValue;}public boolean isBetweenValue() {return betweenValue;}public boolean isListValue() {return listValue;}public String getTypeHandler() {return typeHandler;}protected Criterion(String condition) {super();this.condition = condition;this.typeHandler = null;this.noValue = true;}protected Criterion(String condition, Object value, String typeHandler) {super();this.condition = condition;this.value = value;this.typeHandler = typeHandler;if (value instanceof List) {this.listValue = true;} else {this.singleValue = true;}}protected Criterion(String condition, Object value) {this(condition, value, null);}protected Criterion(String condition, Object value, Object secondValue, String typeHandler) {super();this.condition = condition;this.value = value;this.secondValue = secondValue;this.typeHandler = typeHandler;this.betweenValue = true;}protected Criterion(String condition, Object value, Object secondValue) {this(condition, value, secondValue, null);}}
}
CarMapper.xml配置文件


and ${criterion.condition}and ${criterion.condition} #{criterion.value}and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}and ${criterion.condition}#{listItem}and ${criterion.condition}and ${criterion.condition} #{criterion.value}and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}and ${criterion.condition}#{listItem}id, car_num, brand, guide_price, produce_time, car_typedelete from t_carwhere id = #{id,jdbcType=BIGINT}delete from t_carinsert into t_car (id, car_num, brand, guide_price, produce_time, car_type)values (#{id,jdbcType=BIGINT}, #{carNum,jdbcType=VARCHAR}, #{brand,jdbcType=VARCHAR}, #{guidePrice,jdbcType=DECIMAL}, #{produceTime,jdbcType=CHAR}, #{carType,jdbcType=VARCHAR})insert into t_carid,car_num,brand,guide_price,produce_time,car_type,#{id,jdbcType=BIGINT},#{carNum,jdbcType=VARCHAR},#{brand,jdbcType=VARCHAR},#{guidePrice,jdbcType=DECIMAL},#{produceTime,jdbcType=CHAR},#{carType,jdbcType=VARCHAR},update t_carid = #{row.id,jdbcType=BIGINT},car_num = #{row.carNum,jdbcType=VARCHAR},brand = #{row.brand,jdbcType=VARCHAR},guide_price = #{row.guidePrice,jdbcType=DECIMAL},produce_time = #{row.produceTime,jdbcType=CHAR},car_type = #{row.carType,jdbcType=VARCHAR},update t_carset id = #{row.id,jdbcType=BIGINT},car_num = #{row.carNum,jdbcType=VARCHAR},brand = #{row.brand,jdbcType=VARCHAR},guide_price = #{row.guidePrice,jdbcType=DECIMAL},produce_time = #{row.produceTime,jdbcType=CHAR},car_type = #{row.carType,jdbcType=VARCHAR}update t_carcar_num = #{carNum,jdbcType=VARCHAR},brand = #{brand,jdbcType=VARCHAR},guide_price = #{guidePrice,jdbcType=DECIMAL},produce_time = #{produceTime,jdbcType=CHAR},car_type = #{carType,jdbcType=VARCHAR},where id = #{id,jdbcType=BIGINT}update t_carset car_num = #{carNum,jdbcType=VARCHAR},brand = #{brand,jdbcType=VARCHAR},guide_price = #{guidePrice,jdbcType=DECIMAL},produce_time = #{produceTime,jdbcType=CHAR},car_type = #{carType,jdbcType=VARCHAR}where id = #{id,jdbcType=BIGINT}
（4）编写测试程序（增强版）
 （1）增强版的查询方式就比较特殊，特别是根据条件查询，是QBC 风格：Query By Criteria 一种查询方式，比较面向对象，看不到sql语句！
 （2）条件查询步骤：
 ①先封装条件，通过CarExample对象来封装查询条件
 ②调用carExample.createCriteria()方法来创建查询条件，后面通过" 点. "的方式跟上方法 
package com.bjpowernode.mybatis.test;import com.bjpowernode.mybatis.mapper.CarMapper;
import com.bjpowernode.mybatis.pojo.Car;
import com.bjpowernode.mybatis.pojo.CarExample;
import com.bjpowernode.mybatis.utils.SqlSessionUtil;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;import java.math.BigDecimal;
import java.util.List;public class CarMapperTest {@Testpublic void testSelect(){SqlSession sqlSession = SqlSessionUtil.openSession();CarMapper mapper = sqlSession.getMapper(CarMapper.class);// 执行查询// 1. 查询一个Car car = mapper.selectByPrimaryKey(34L);System.out.println(car);// 2. 查询所有（selectByExample，根据条件查询，如果条件是null表示没有条件）List cars = mapper.selectByExample(null);cars.forEach(car1 -> System.out.println(car1));System.out.println("==================");// 3.按照条件进行查询// QBC 风格：Query By Criteria 一种查询方式，比较面向对象，看不到sql语句。// 3.1 封装条件，通过CarExample对象来封装查询条件CarExample carExample = new CarExample();// 3.2调用carExample.createCriteria()方法来创建查询条件carExample.createCriteria().andBrandLike("帕萨特").andGuidePriceGreaterThan(new BigDecimal(20.0));// 添加orcarExample.or().andCarTypeEqualTo("燃油车");// 执行查询List cars1 = mapper.selectByExample(carExample);cars1.forEach(car1 -> System.out.println(car1));sqlSession.close();}}
以上的SQL语句就等价于：

                
                
                词库加载错误:未能找到文件“E:\highferrum_mysql\Configuration\Dict_Stopwords.txt”。
                            

                
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