7-2 分类表设计与持久层代码生成

基本的无限级树型表结构设计：id + parent

sql-scripts/create_ebook_table.sql → sql-scripts/create_tables.sql

@@ -17,4 +17,30 @@ insert into `ebook` (id, name, description) values (1, 'Spring Boot 入门教程
 insert into `ebook` (id, name, description) values (2, 'Vue 入门教程', '零基础入门 Vue 开发，企业级应用开发最佳首选框架');
 insert into `ebook` (id, name, description) values (3, 'Python 入门教程', '零基础入门 Python 开发，企业级应用开发最佳首选框架');
 insert into `ebook` (id, name, description) values (4, 'Mysql 入门教程', '零基础入门 Mysql 开发，企业级应用开发最佳首选框架');
-insert into `ebook` (id, name, description) values (5, 'Oracle 入门教程', '零基础入门 Oracle 开发，企业级应用开发最佳首选框架');
\ No newline at end of file
+insert into `ebook` (id, name, description) values (5, 'Oracle 入门教程', '零基础入门 Oracle 开发，企业级应用开发最佳首选框架');
+
+
+drop table if exists `category`;
+create table `category` (
+    `id` bigint not null comment 'id',
+    `parent` bigint not null default 0 comment '父id',
+    `name` varchar(255) not null comment '名称',
+    `sort` int comment '顺序',
+    primary key (`id`)
+) engine=innodb default charset = utf8mb4 comment = '分类';
+
+insert into `category` (id, parent, name, sort) values (100, 000, '前端开发', 100);
+insert into `category` (id, parent, name, sort) values (101, 100, 'Vue', 101);
+insert into `category` (id, parent, name, sort) values (102, 100, 'HTML & CSS', 102);
+insert into `category` (id, parent, name, sort) values (200, 000, 'Java', 200);
+insert into `category` (id, parent, name, sort) values (201, 200, '基础应用', 201);
+insert into `category` (id, parent, name, sort) values (202, 200, '框架应用', 202);
+insert into `category` (id, parent, name, sort) values (300, 000, 'Python', 300);
+insert into `category` (id, parent, name, sort) values (301, 300, '基础应用', 301);
+insert into `category` (id, parent, name, sort) values (302, 300, '进阶方向应用', 302);
+insert into `category` (id, parent, name, sort) values (400, 000, '数据库', 400);
+insert into `category` (id, parent, name, sort) values (401, 400, 'MySQL', 401);
+insert into `category` (id, parent, name, sort) values (500, 000, '其它', 500);
+insert into `category` (id, parent, name, sort) values (501, 500, '服务器', 501);
+insert into `category` (id, parent, name, sort) values (502, 500, '开发工具', 502);
+insert into `category` (id, parent, name, sort) values (503, 500, '热门服务端语言', 503);
\ No newline at end of file

src/main/java/io/github/yubincloud/fairywiki/domain/Category.java

+package io.github.yubincloud.fairywiki.domain;
+
+public class Category {
+    private Long id;
+
+    private Long parent;
+
+    private String name;
+
+    private Integer sort;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getParent() {
+        return parent;
+    }
+
+    public void setParent(Long parent) {
+        this.parent = parent;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Integer getSort() {
+        return sort;
+    }
+
+    public void setSort(Integer sort) {
+        this.sort = sort;
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append(getClass().getSimpleName());
+        sb.append(" [");
+        sb.append("Hash = ").append(hashCode());
+        sb.append(", id=").append(id);
+        sb.append(", parent=").append(parent);
+        sb.append(", name=").append(name);
+        sb.append(", sort=").append(sort);
+        sb.append("]");
+        return sb.toString();
+    }
+}
\ No newline at end of file

src/main/java/io/github/yubincloud/fairywiki/domain/CategoryExample.java

+package io.github.yubincloud.fairywiki.domain;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class CategoryExample {
+    protected String orderByClause;
+
+    protected boolean distinct;
+
+    protected List<Criteria> oredCriteria;
+
+    public CategoryExample() {
+        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<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<>();
+        }
+
+        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(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<Long> values) {
+            addCriterion("id in", values, "id");
+            return (Criteria) this;
+        }
+
+        public Criteria andIdNotIn(List<Long> 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 andParentIsNull() {
+            addCriterion("parent is null");
+            return (Criteria) this;
+        }
+
+        public Criteria andParentIsNotNull() {
+            addCriterion("parent is not null");
+            return (Criteria) this;
+        }
+
+        public Criteria andParentEqualTo(Long value) {
+            addCriterion("parent =", value, "parent");
+            return (Criteria) this;
+        }
+
+        public Criteria andParentNotEqualTo(Long value) {
+            addCriterion("parent <>", value, "parent");
+            return (Criteria) this;
+        }
+
+        public Criteria andParentGreaterThan(Long value) {
+            addCriterion("parent >", value, "parent");
+            return (Criteria) this;
+        }
+
+        public Criteria andParentGreaterThanOrEqualTo(Long value) {
+            addCriterion("parent >=", value, "parent");
+            return (Criteria) this;
+        }
+
+        public Criteria andParentLessThan(Long value) {
+            addCriterion("parent <", value, "parent");
+            return (Criteria) this;
+        }
+
+        public Criteria andParentLessThanOrEqualTo(Long value) {
+            addCriterion("parent <=", value, "parent");
+            return (Criteria) this;
+        }
+
+        public Criteria andParentIn(List<Long> values) {
+            addCriterion("parent in", values, "parent");
+            return (Criteria) this;
+        }
+
+        public Criteria andParentNotIn(List<Long> values) {
+            addCriterion("parent not in", values, "parent");
+            return (Criteria) this;
+        }
+
+        public Criteria andParentBetween(Long value1, Long value2) {
+            addCriterion("parent between", value1, value2, "parent");
+            return (Criteria) this;
+        }
+
+        public Criteria andParentNotBetween(Long value1, Long value2) {
+            addCriterion("parent not between", value1, value2, "parent");
+            return (Criteria) this;
+        }
+
+        public Criteria andNameIsNull() {
+            addCriterion("`name` is null");
+            return (Criteria) this;
+        }
+
+        public Criteria andNameIsNotNull() {
+            addCriterion("`name` is not null");
+            return (Criteria) this;
+        }
+
+        public Criteria andNameEqualTo(String value) {
+            addCriterion("`name` =", value, "name");
+            return (Criteria) this;
+        }
+
+        public Criteria andNameNotEqualTo(String value) {
+            addCriterion("`name` <>", value, "name");
+            return (Criteria) this;
+        }
+
+        public Criteria andNameGreaterThan(String value) {
+            addCriterion("`name` >", value, "name");
+            return (Criteria) this;
+        }
+
+        public Criteria andNameGreaterThanOrEqualTo(String value) {
+            addCriterion("`name` >=", value, "name");
+            return (Criteria) this;
+        }
+
+        public Criteria andNameLessThan(String value) {
+            addCriterion("`name` <", value, "name");
+            return (Criteria) this;
+        }
+
+        public Criteria andNameLessThanOrEqualTo(String value) {
+            addCriterion("`name` <=", value, "name");
+            return (Criteria) this;
+        }
+
+        public Criteria andNameLike(String value) {
+            addCriterion("`name` like", value, "name");
+            return (Criteria) this;
+        }
+
+        public Criteria andNameNotLike(String value) {
+            addCriterion("`name` not like", value, "name");
+            return (Criteria) this;
+        }
+
+        public Criteria andNameIn(List<String> values) {
+            addCriterion("`name` in", values, "name");
+            return (Criteria) this;
+        }
+
+        public Criteria andNameNotIn(List<String> values) {
+            addCriterion("`name` not in", values, "name");
+            return (Criteria) this;
+        }
+
+        public Criteria andNameBetween(String value1, String value2) {
+            addCriterion("`name` between", value1, value2, "name");
+            return (Criteria) this;
+        }
+
+        public Criteria andNameNotBetween(String value1, String value2) {
+            addCriterion("`name` not between", value1, value2, "name");
+            return (Criteria) this;
+        }
+
+        public Criteria andSortIsNull() {
+            addCriterion("sort is null");
+            return (Criteria) this;
+        }
+
+        public Criteria andSortIsNotNull() {
+            addCriterion("sort is not null");
+            return (Criteria) this;
+        }
+
+        public Criteria andSortEqualTo(Integer value) {
+            addCriterion("sort =", value, "sort");
+            return (Criteria) this;
+        }
+
+        public Criteria andSortNotEqualTo(Integer value) {
+            addCriterion("sort <>", value, "sort");
+            return (Criteria) this;
+        }
+
+        public Criteria andSortGreaterThan(Integer value) {
+            addCriterion("sort >", value, "sort");
+            return (Criteria) this;
+        }
+
+        public Criteria andSortGreaterThanOrEqualTo(Integer value) {
+            addCriterion("sort >=", value, "sort");
+            return (Criteria) this;
+        }
+
+        public Criteria andSortLessThan(Integer value) {
+            addCriterion("sort <", value, "sort");
+            return (Criteria) this;
+        }
+
+        public Criteria andSortLessThanOrEqualTo(Integer value) {
+            addCriterion("sort <=", value, "sort");
+            return (Criteria) this;
+        }
+
+        public Criteria andSortIn(List<Integer> values) {
+            addCriterion("sort in", values, "sort");
+            return (Criteria) this;
+        }
+
+        public Criteria andSortNotIn(List<Integer> values) {
+            addCriterion("sort not in", values, "sort");
+            return (Criteria) this;
+        }
+
+        public Criteria andSortBetween(Integer value1, Integer value2) {
+            addCriterion("sort between", value1, value2, "sort");
+            return (Criteria) this;
+        }
+
+        public Criteria andSortNotBetween(Integer value1, Integer value2) {
+            addCriterion("sort not between", value1, value2, "sort");
+            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);
+        }
+    }
+}
\ No newline at end of file

src/main/java/io/github/yubincloud/fairywiki/mapper/CategoryMapper.java

+package io.github.yubincloud.fairywiki.mapper;
+
+import io.github.yubincloud.fairywiki.domain.Category;
+import io.github.yubincloud.fairywiki.domain.CategoryExample;
+import java.util.List;
+import org.apache.ibatis.annotations.Param;
+
+public interface CategoryMapper {
+    long countByExample(CategoryExample example);
+
+    int deleteByExample(CategoryExample example);
+
+    int deleteByPrimaryKey(Long id);
+
+    int insert(Category record);
+
+    int insertSelective(Category record);
+
+    List<Category> selectByExample(CategoryExample example);
+
+    Category selectByPrimaryKey(Long id);
+
+    int updateByExampleSelective(@Param("record") Category record, @Param("example") CategoryExample example);
+
+    int updateByExample(@Param("record") Category record, @Param("example") CategoryExample example);
+
+    int updateByPrimaryKeySelective(Category record);
+
+    int updateByPrimaryKey(Category record);
+}
\ No newline at end of file

src/main/resources/generator/generator-config.xml

@@ -40,6 +40,6 @@
                              targetPackage="io.github.yubincloud.fairywiki.mapper"
                              type="XMLMAPPER"/>
 
-        <table tableName="ebook" domainObjectName="Ebook"/>
+        <table tableName="category"/>
     </context>
 </generatorConfiguration>

src/main/resources/mapper/CategoryMapper.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="io.github.yubincloud.fairywiki.mapper.CategoryMapper">
+  <resultMap id="BaseResultMap" type="io.github.yubincloud.fairywiki.domain.Category">
+    <id column="id" jdbcType="BIGINT" property="id" />
+    <result column="parent" jdbcType="BIGINT" property="parent" />
+    <result column="name" jdbcType="VARCHAR" property="name" />
+    <result column="sort" jdbcType="INTEGER" property="sort" />
+  </resultMap>
+  <sql id="Example_Where_Clause">
+    <where>
+      <foreach collection="oredCriteria" item="criteria" separator="or">
+        <if test="criteria.valid">
+          <trim prefix="(" prefixOverrides="and" suffix=")">
+            <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 close=")" collection="criterion.value" item="listItem" open="(" 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="(" prefixOverrides="and" suffix=")">
+            <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 close=")" collection="criterion.value" item="listItem" open="(" separator=",">
+                    #{listItem}
+                  </foreach>
+                </when>
+              </choose>
+            </foreach>
+          </trim>
+        </if>
+      </foreach>
+    </where>
+  </sql>
+  <sql id="Base_Column_List">
+    id, parent, `name`, sort
+  </sql>
+  <select id="selectByExample" parameterType="io.github.yubincloud.fairywiki.domain.CategoryExample" resultMap="BaseResultMap">
+    select
+    <if test="distinct">
+      distinct
+    </if>
+    <include refid="Base_Column_List" />
+    from category
+    <if test="_parameter != null">
+      <include refid="Example_Where_Clause" />
+    </if>
+    <if test="orderByClause != null">
+      order by ${orderByClause}
+    </if>
+  </select>
+  <select id="selectByPrimaryKey" parameterType="java.lang.Long" resultMap="BaseResultMap">
+    select 
+    <include refid="Base_Column_List" />
+    from category
+    where id = #{id,jdbcType=BIGINT}
+  </select>
+  <delete id="deleteByPrimaryKey" parameterType="java.lang.Long">
+    delete from category
+    where id = #{id,jdbcType=BIGINT}
+  </delete>
+  <delete id="deleteByExample" parameterType="io.github.yubincloud.fairywiki.domain.CategoryExample">
+    delete from category
+    <if test="_parameter != null">
+      <include refid="Example_Where_Clause" />
+    </if>
+  </delete>
+  <insert id="insert" parameterType="io.github.yubincloud.fairywiki.domain.Category">
+    insert into category (id, parent, `name`, 
+      sort)
+    values (#{id,jdbcType=BIGINT}, #{parent,jdbcType=BIGINT}, #{name,jdbcType=VARCHAR}, 
+      #{sort,jdbcType=INTEGER})
+  </insert>
+  <insert id="insertSelective" parameterType="io.github.yubincloud.fairywiki.domain.Category">
+    insert into category
+    <trim prefix="(" suffix=")" suffixOverrides=",">
+      <if test="id != null">
+        id,
+      </if>
+      <if test="parent != null">
+        parent,
+      </if>
+      <if test="name != null">
+        `name`,
+      </if>
+      <if test="sort != null">
+        sort,
+      </if>
+    </trim>
+    <trim prefix="values (" suffix=")" suffixOverrides=",">
+      <if test="id != null">
+        #{id,jdbcType=BIGINT},
+      </if>
+      <if test="parent != null">
+        #{parent,jdbcType=BIGINT},
+      </if>
+      <if test="name != null">
+        #{name,jdbcType=VARCHAR},
+      </if>
+      <if test="sort != null">
+        #{sort,jdbcType=INTEGER},
+      </if>
+    </trim>
+  </insert>
+  <select id="countByExample" parameterType="io.github.yubincloud.fairywiki.domain.CategoryExample" resultType="java.lang.Long">
+    select count(*) from category
+    <if test="_parameter != null">
+      <include refid="Example_Where_Clause" />
+    </if>
+  </select>
+  <update id="updateByExampleSelective" parameterType="map">
+    update category
+    <set>
+      <if test="record.id != null">
+        id = #{record.id,jdbcType=BIGINT},
+      </if>
+      <if test="record.parent != null">
+        parent = #{record.parent,jdbcType=BIGINT},
+      </if>
+      <if test="record.name != null">
+        `name` = #{record.name,jdbcType=VARCHAR},
+      </if>
+      <if test="record.sort != null">
+        sort = #{record.sort,jdbcType=INTEGER},
+      </if>
+    </set>
+    <if test="_parameter != null">
+      <include refid="Update_By_Example_Where_Clause" />
+    </if>
+  </update>
+  <update id="updateByExample" parameterType="map">
+    update category
+    set id = #{record.id,jdbcType=BIGINT},
+      parent = #{record.parent,jdbcType=BIGINT},
+      `name` = #{record.name,jdbcType=VARCHAR},
+      sort = #{record.sort,jdbcType=INTEGER}
+    <if test="_parameter != null">
+      <include refid="Update_By_Example_Where_Clause" />
+    </if>
+  </update>
+  <update id="updateByPrimaryKeySelective" parameterType="io.github.yubincloud.fairywiki.domain.Category">
+    update category
+    <set>
+      <if test="parent != null">
+        parent = #{parent,jdbcType=BIGINT},
+      </if>
+      <if test="name != null">
+        `name` = #{name,jdbcType=VARCHAR},
+      </if>
+      <if test="sort != null">
+        sort = #{sort,jdbcType=INTEGER},
+      </if>
+    </set>
+    where id = #{id,jdbcType=BIGINT}
+  </update>
+  <update id="updateByPrimaryKey" parameterType="io.github.yubincloud.fairywiki.domain.Category">
+    update category
+    set parent = #{parent,jdbcType=BIGINT},
+      `name` = #{name,jdbcType=VARCHAR},
+      sort = #{sort,jdbcType=INTEGER}
+    where id = #{id,jdbcType=BIGINT}
+  </update>
+</mapper>
\ No newline at end of file