【Mybatis】【1】generate批量生成实体类，数据库接口类和mapper

前言：

1，实体类之类如果自己写的话，比较繁琐，还容易出错，所以用generate自动生成

2，int类型可能会生成为short类型，建议不要手动改回int类。因为下次生成又是short类型了，可能会对代码有影响，每次都更改又比较麻烦

正文：

用法：点击generate.bat即可执行，如果报错，需要看执行的信息，就用命令行执行

注：有的时候再次生成mapper之后，启动项目会报错。删除生成的mapper文件，重新生成一次就好了

jar包：ojdbc6.jar（这是oracle的驱动jar包，mysql是mysql-connector-java-3.1.12-bin.jar），mybatis-generator-core-1.3.2.jar（网盘链接：https://pan.baidu.com/s/1sE3wAbbcXLCmMvY_OfSw5g 提取码：qy2p ）

generatorConfig.xml

<?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>
<classPathEntry location="G:\lib\ojdbc6.jar" /> <!-- 数据库驱动jar包 -->
  <context id="context1">
    <plugin type="org.mybatis.generator.plugins.RowBoundsPlugin"></plugin> <!-- 翻页 -->
    <commentGenerator>
      <property name="suppressAllComments" value="true"/>
    </commentGenerator>
    <jdbcConnection connectionURL="jdbc:oracle:thin:@172.1.1.0:1521/test" driverClass="oracle.jdbc.driver.OracleDriver" userId="test" password="test" /> <!-- 数据库账号密码 -->
    <javaTypeResolver>
          <property name="forceBigDecimals" value="false" />
    </javaTypeResolver>
    <javaModelGenerator targetPackage="com.bf.doctor.entity" targetProject="G:\BFDoctor\Source\src\main\java" /> <!-- 实体类 -->
    <sqlMapGenerator targetPackage="mybatis.mapper" targetProject="G:\BFDoctor\Source\src\main\resources" /> <!-- 数据库xml文件 -->
    <javaClientGenerator type="XMLMAPPER" targetPackage="com.bf.doctor.dao.mapper"  targetProject="G:\BFDoctor\Source\src\main\java" /><!-- 数据库接口文件 -->

    <table tableName="A" /> <!-- 表名 -->

    <!--
    <table tableName="A" />
    <table tableName="B" />
    <table tableName="C" />
    --> <!-- 全部表名，用完不要删除，之后生成单个表就拿出去 -->
  </context>

</generatorConfiguration>

generate.bat

java -jar G:\lib\mybatis-generator-core-1.3.2.jar -configfile generatorConfig.xml -overwrite

生成的文件：

实体类Test

package com.bf.doctor.entity;

public class Test {
    private String id;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
}

映射TestExample

package com.bf.doctor.entity;

import java.util.ArrayList;
import java.util.List;

public class TestExample {
    protected String orderByClause;

    protected boolean distinct;

    protected List<Criteria> oredCriteria;

    public TestExample() {
        oredCriteria = new ArrayList<Criteria>();
    }

    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<Criteria> 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<Criterion> criteria;

        protected GeneratedCriteria() {
            super();
            criteria = new ArrayList<Criterion>();
        }

        public boolean isValid() {
            return criteria.size() > 0;
        }

        public List<Criterion> getAllCriteria() {
            return criteria;
        }

        public List<Criterion> 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(String value) {
            addCriterion("ID =", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdNotEqualTo(String value) {
            addCriterion("ID <>", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdGreaterThan(String value) {
            addCriterion("ID >", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdGreaterThanOrEqualTo(String value) {
            addCriterion("ID >=", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdLessThan(String value) {
            addCriterion("ID <", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdLessThanOrEqualTo(String value) {
            addCriterion("ID <=", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdLike(String value) {
            addCriterion("ID like", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdNotLike(String value) {
            addCriterion("ID not like", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdIn(List<String> values) {
            addCriterion("ID in", values, "id");
            return (Criteria) this;
        }

        public Criteria andIdNotIn(List<String> values) {
            addCriterion("ID not in", values, "id");
            return (Criteria) this;
        }

        public Criteria andIdBetween(String value1, String value2) {
            addCriterion("ID between", value1, value2, "id");
            return (Criteria) this;
        }

        public Criteria andIdNotBetween(String value1, String value2) {
            addCriterion("ID not between", value1, value2, "id");
            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);
        }
    }
}

数据库接口TestMapper

package com.bf.doctor.dao.mapper;

import java.util.List;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.session.RowBounds;

public interface TestMapper {
    int countByExample(TestExample example);

    int deleteByExample(TestExample example);

    int insert(Test record);

    int insertSelective(Test record);

    List<Test> selectByExampleWithRowbounds(TestExample example, RowBounds rowBounds);

    List<Test> selectByExample(TestExample example);

    int updateByExampleSelective(@Param("record") Test record, @Param("example") TestExample example);

    int updateByExample(@Param("record") Test record, @Param("example") TestExample example);
}

数据库mapper

<?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.bf.doctor.dao.mapper.TestMapper" >
  <resultMap id="BaseResultMap" type="com.bf.doctor.entity.Test" >
    <result column="ID" property="id" jdbcType="VARCHAR" />
  </resultMap>
  <sql id="Example_Where_Clause" >
    <where >
      <foreach collection="oredCriteria" item="criteria" separator="or" >
        <if test="criteria.valid" >
          <trim prefix="(" suffix=")" prefixOverrides="and" >
            <foreach collection="criteria.criteria" item="criterion" >
              <choose >
                <when test="criterion.noValue" >
                  and ${criterion.condition}
                </when>
                <when test="criterion.singleValue" >
                  and ${criterion.condition} #{criterion.value}
                </when>
                <when test="criterion.betweenValue" >
                  and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                </when>
                <when test="criterion.listValue" >
                  and ${criterion.condition}
                  <foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," >
                    #{listItem}
                  </foreach>
                </when>
              </choose>
            </foreach>
          </trim>
        </if>
      </foreach>
    </where>
  </sql>
  <sql id="Update_By_Example_Where_Clause" >
    <where >
      <foreach collection="example.oredCriteria" item="criteria" separator="or" >
        <if test="criteria.valid" >
          <trim prefix="(" suffix=")" prefixOverrides="and" >
            <foreach collection="criteria.criteria" item="criterion" >
              <choose >
                <when test="criterion.noValue" >
                  and ${criterion.condition}
                </when>
                <when test="criterion.singleValue" >
                  and ${criterion.condition} #{criterion.value}
                </when>
                <when test="criterion.betweenValue" >
                  and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                </when>
                <when test="criterion.listValue" >
                  and ${criterion.condition}
                  <foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," >
                    #{listItem}
                  </foreach>
                </when>
              </choose>
            </foreach>
          </trim>
        </if>
      </foreach>
    </where>
  </sql>
  <sql id="Base_Column_List" >
    ID
  </sql>
  <select id="selectByExample" resultMap="BaseResultMap" parameterType="com.bf.doctor.entity.TestExample" >
    select
    <if test="distinct" >
      distinct
    </if>
    <include refid="Base_Column_List" />
    from TEST
    <if test="_parameter != null" >
      <include refid="Example_Where_Clause" />
    </if>
    <if test="orderByClause != null" >
      order by ${orderByClause}
    </if>
  </select>
  <delete id="deleteByExample" parameterType="com.bf.doctor.entity.TestExample" >
    delete from TEST
    <if test="_parameter != null" >
      <include refid="Example_Where_Clause" />
    </if>
  </delete>
  <insert id="insert" parameterType="com.bf.doctor.entity.Test" >
    insert into TEST (ID)
    values (#{id,jdbcType=VARCHAR})
  </insert>
  <insert id="insertSelective" parameterType="com.bf.doctor.entity.Test" >
    insert into TEST
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="id != null" >
        ID,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="id != null" >
        #{id,jdbcType=VARCHAR},
      </if>
    </trim>
  </insert>
  <select id="countByExample" parameterType="com.bf.doctor.entity.TestExample" resultType="java.lang.Integer" >
    select count(*) from TEST
    <if test="_parameter != null" >
      <include refid="Example_Where_Clause" />
    </if>
  </select>
  <update id="updateByExampleSelective" parameterType="map" >
    update TEST
    <set >
      <if test="record.id != null" >
        ID = #{record.id,jdbcType=VARCHAR},
      </if>
    </set>
    <if test="_parameter != null" >
      <include refid="Update_By_Example_Where_Clause" />
    </if>
  </update>
  <update id="updateByExample" parameterType="map" >
    update TEST
    set ID = #{record.id,jdbcType=VARCHAR}
    <if test="_parameter != null" >
      <include refid="Update_By_Example_Where_Clause" />
    </if>
  </update>
  <select resultMap="BaseResultMap" parameterType="com.bf.doctor.entity.TestExample" id="selectByExampleWithRowbounds" >
    select
    <if test="distinct" >
      distinct
    </if>
    <include refid="Base_Column_List" />
    from TEST
    <if test="_parameter != null" >
      <include refid="Example_Where_Clause" />
    </if>
    <if test="orderByClause != null" >
      order by ${orderByClause}
    </if>
  </select>
</mapper>

参考博客：

1，mybatis三剑客之mybatis-generator生成数据对象和时间戳优化 - xyphf的博客 - CSDN博客
https://blog.csdn.net/xyphf/article/details/81229636