• 【Mybatis】MyBatis之Generator自动生成代码(九)


    MyBatis Generator 简介

      MyBatis Generator 连接数据库表并生成MyBatis或iBatis文件。这有助于最大限度地减少使用MyBatis时为数据库文件创建简单CRUD操作所需的工作量。

      参考文档:http://www.mybatis.org/generator/

      下载地址:https://github.com/mybatis/generator/releases

    MyBatis Generator 使用

      本例环境已安装java环境,且数据库是mysql,表结构如下:

     1 CREATE DATABASE test_mybatis;
     2 USE test_mybatis;
     3 
     4 -- ----------------------------
     5 -- Table structure for employee
     6 -- ----------------------------
     7 DROP TABLE IF EXISTS `employee`;
     8 CREATE TABLE `employee` (
     9   `id` int(11) NOT NULL AUTO_INCREMENT,
    10   `last_name` varchar(255) DEFAULT NULL,
    11   `gender` char(1) DEFAULT NULL,
    12   `email` varchar(255) DEFAULT NULL,
    13   `dept_id` int(11) DEFAULT NULL COMMENT '部门ID',
    14   PRIMARY KEY (`id`)
    15 ) ENGINE=InnoDB AUTO_INCREMENT=36 DEFAULT CHARSET=utf8;
    16 
    17 -- ----------------------------
    18 -- Records of employee
    19 -- ----------------------------
    20 BEGIN;
    21 INSERT INTO `employee` VALUES (1, '大白', '1', 'dabai@163.com', 1);
    22 INSERT INTO `employee` VALUES (2, '小明', '1', 'xiaoming@163.com', 1);
    23 INSERT INTO `employee` VALUES (3, '小红', '1', 'xiaohong@163.com', 1);
    24 COMMIT;
    25 
    26 

      1、使用命令行的方式使用

        a、下载mybatis-generator,如下:

          

        b、新建配置文件mbg.xml,参考文档:http://www.mybatis.org/generator/

      1 <?xml version="1.0" encoding="UTF-8"?>
      2 <!DOCTYPE generatorConfiguration
      3   PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
      4   "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
      5 
      6 <generatorConfiguration>
      7 
      8     <classPathEntry
      9         location="/Users/h__d/.m2/repository/mysql/mysql-connector-java/8.0.13/mysql-connector-java-8.0.13.jar" />
     10      
     11     <!-- 
     12         context:生成一组对象的环境 
     13         id:必选,上下文id,用于在生成错误时提示
     14         defaultModelType:指定生成对象的样式
     15             1,conditional:类似hierarchical;
     16             2,flat:所有内容(主键,blob)等全部生成在一个对象中;
     17             3,hierarchical:主键生成一个XXKey对象(key class),Blob等单独生成一个对象,其他简单属性在一个对象中(record class)
     18         targetRuntime:
     19             1,MyBatis3:默认的值,生成基于MyBatis3.x以上版本的内容,包括XXXBySample;
     20             2,MyBatis3Simple:类似MyBatis3,只是不生成XXXBySample;
     21         introspectedColumnImpl:类全限定名,用于扩展MBG
     22     -->
     23     <context id="DB2Tables" targetRuntime="MyBatis3">
     24     
     25         
     26  
     27         <!-- 自动识别数据库关键字,默认false,如果设置为true,根据SqlReservedWords中定义的关键字列表;
     28             一般保留默认值,遇到数据库关键字(Java关键字),使用columnOverride覆盖
     29          -->
     30         <property name="autoDelimitKeywords" value="false"/>
     31         <!-- 生成的Java文件的编码 -->
     32         <property name="javaFileEncoding" value="UTF-8"/>
     33         <!-- 格式化java代码 -->
     34         <property name="javaFormatter" value="org.mybatis.generator.api.dom.DefaultJavaFormatter"/>
     35         <!-- 格式化XML代码 -->
     36         <property name="xmlFormatter" value="org.mybatis.generator.api.dom.DefaultXmlFormatter"/>
     37      
     38         <!-- beginningDelimiter和endingDelimiter:指明数据库的用于标记数据库对象名的符号,比如ORACLE就是双引号,MYSQL默认是`反引号; -->
     39         <property name="beginningDelimiter" value="`"/>
     40         <property name="endingDelimiter" value="`"/>
     41         
     42         <!-- 配置pojo的序列化 -->
     43         <plugin type="org.mybatis.generator.plugins.SerializablePlugin" />
     44        
     45         <commentGenerator>
     46             <!-- 是否去除自动生成的文档注释 true:是 : false:否(默认) -->  
     47             <property name="suppressAllComments" value="true"/> 
     48             <!-- 是否添加数据库注释备注 true:是  false:否(默认) -->
     49             <property name="addRemarkComments" value="true" />
     50             <!-- 是否去除自动生成的时间 true:是 : false:否(默认) -->  
     51               <property name="suppressDate" value="false" />
     52               <!-- 注释时间格式 -->  
     53               <property name="dateFormat" value="yyyy-MM-dd HH:mm:ss" />
     54         </commentGenerator>
     55         
     56         <!-- JDBC 连接 -->
     57         <jdbcConnection driverClass="com.mysql.jdbc.Driver"
     58             connectionURL="jdbc:mysql://mysql.naughty7878.top:3306/test_mybatis?allowPublicKeyRetrieval=true"
     59             userId="hd" password="hd123456">
     60         </jdbcConnection>
     61 
     62 
     63         <!-- java类型处理器 
     64                 用于处理DB中的类型到Java中的类型,默认使用JavaTypeResolverDefaultImpl;
     65                 注意一点,默认会先尝试使用Integer,Long,Short等来对应DECIMAL和 NUMERIC数据类型; 
     66          -->
     67         <javaTypeResolver>
     68             <!-- 
     69                 true:使用BigDecimal对应DECIMAL和 NUMERIC数据类型
     70                 false:默认,
     71                     scale>0;length>18:使用BigDecimal;
     72                     scale=0;length[10,18]:使用Long;
     73                     scale=0;length[5,9]:使用Integer;
     74                     scale=0;length<5:使用Short;
     75              -->
     76             <property name="forceBigDecimals" value="false" />
     77         </javaTypeResolver>
     78 
     79         <!-- java模型创建器,是必须要的元素
     80                 负责:1,key类(见context的defaultModelType);2,java类;3,查询类
     81                 targetPackage:生成的类要放的包,真实的包受enableSubPackages属性控制;
     82                 targetProject:目标项目,指定一个存在的目录下,生成的内容会放到指定目录中,如果目录不存在,MBG不会自动建目录
     83         -->
     84         <javaModelGenerator targetPackage="com.test.mybatis.pojo"
     85             targetProject="src/main/java">
     86             
     87             <!-- 在targetPackage的基础上,根据数据库的schema再生成一层package,最终生成的类放在这个package下,默认为false -->
     88             <property name="enableSubPackages" value="true" />
     89             <!-- 设置是否在getter方法中,对String类型字段调用trim()方法 -->
     90             <property name="trimStrings" value="false" />
     91         </javaModelGenerator>
     92 
     93         <!-- 生成SQL map的XML文件生成器,
     94              注意,在Mybatis3之后,我们可以使用mapper.xml文件+Mapper接口(或者不用mapper接口),
     95              或者只使用Mapper接口+Annotation,所以,如果 javaClientGenerator配置中配置了需要生成XML的话,这个元素就必须配置
     96              targetPackage/targetProject:同javaModelGenerator
     97         -->
     98         <sqlMapGenerator targetPackage="mapper"
     99             targetProject="src/main/resources">
    100             <!-- 在targetPackage的基础上,根据数据库的schema再生成一层package,最终生成的类放在这个package下,默认为false -->
    101             <property name="enableSubPackages" value="true" />
    102         </sqlMapGenerator>
    103 
    104         <!-- 对于mybatis来说,即生成Mapper接口,注意,如果没有配置该元素,那么默认不会生成Mapper接口 
    105             targetPackage/targetProject:同javaModelGenerator
    106             type:选择怎么生成mapper接口(在MyBatis3/MyBatis3Simple下):
    107                 1,ANNOTATEDMAPPER:会生成使用Mapper接口+Annotation的方式创建(SQL生成在annotation中),不会生成对应的XML;
    108                 2,MIXEDMAPPER:使用混合配置,会生成Mapper接口,并适当添加合适的Annotation,但是XML会生成在XML中;
    109                 3,XMLMAPPER:会生成Mapper接口,接口完全依赖XML;
    110             注意,如果context是MyBatis3Simple:只支持ANNOTATEDMAPPER和XMLMAPPER
    111         -->
    112         <javaClientGenerator type="XMLMAPPER"
    113             targetPackage="com.test.mybatis.dao" targetProject="src/main/java">
    114             <property name="enableSubPackages" value="true" />
    115         </javaClientGenerator>
    116 
    117 
    118         <!-- 选择一个table来生成相关文件,可以有一个或多个table,必须要有table元素
    119             选择的table会生成一下文件:
    120             1,SQL map文件
    121             2,生成一个主键类;
    122             3,除了BLOB和主键的其他字段的类;
    123             4,包含BLOB的类;
    124             5,一个用户生成动态查询的条件类(selectByExample, deleteByExample),可选;
    125             6,Mapper接口(可选)
    126             tableName(必要):要生成对象的表名;
    127             注意:大小写敏感问题。正常情况下,MBG会自动的去识别数据库标识符的大小写敏感度,在一般情况下,MBG会
    128                 根据设置的schema,catalog或tablename去查询数据表,按照下面的流程:
    129                 1,如果schema,catalog或tablename中有空格,那么设置的是什么格式,就精确的使用指定的大小写格式去查询;
    130                 2,否则,如果数据库的标识符使用大写的,那么MBG自动把表名变成大写再查找;
    131                 3,否则,如果数据库的标识符使用小写的,那么MBG自动把表名变成小写再查找;
    132                 4,否则,使用指定的大小写格式查询;
    133             另外的,如果在创建表的时候,使用的""把数据库对象规定大小写,就算数据库标识符是使用的大写,在这种情况下也会使用给定的大小写来创建表名;
    134             这个时候,请设置delimitIdentifiers="true"即可保留大小写格式;
    135             可选:
    136             1,schema:数据库的schema;
    137             2,catalog:数据库的catalog;
    138             3,alias:为数据表设置的别名,如果设置了alias,那么生成的所有的SELECT SQL语句中,列名会变成:alias_actualColumnName
    139             4,domainObjectName:生成的domain类的名字,如果不设置,直接使用表名作为domain类的名字;可以设置为somepck.domainName,那么会自动把domainName类再放到somepck包里面;
    140             5,enableInsert(默认true):指定是否生成insert语句;
    141             6,enableSelectByPrimaryKey(默认true):指定是否生成按照主键查询对象的语句(就是getById或get);
    142             7,enableSelectByExample(默认true):MyBatis3Simple为false,指定是否生成动态查询语句;
    143             8,enableUpdateByPrimaryKey(默认true):指定是否生成按照主键修改对象的语句(即update);
    144             9,enableDeleteByPrimaryKey(默认true):指定是否生成按照主键删除对象的语句(即delete);
    145             10,enableDeleteByExample(默认true):MyBatis3Simple为false,指定是否生成动态删除语句;
    146             11,enableCountByExample(默认true):MyBatis3Simple为false,指定是否生成动态查询总条数语句(用于分页的总条数查询);
    147             12,enableUpdateByExample(默认true):MyBatis3Simple为false,指定是否生成动态修改语句(只修改对象中不为空的属性);
    148             13,modelType:参考context元素的defaultModelType,相当于覆盖;
    149             14,delimitIdentifiers:参考tableName的解释,注意,默认的delimitIdentifiers是双引号,如果类似MYSQL这样的数据库,使用的是`(反引号,那么还需要设置context的beginningDelimiter和endingDelimiter属性)
    150             15,delimitAllColumns:设置是否所有生成的SQL中的列名都使用标识符引起来。默认为false,delimitIdentifiers参考context的属性
    151             注意,table里面很多参数都是对javaModelGenerator,context等元素的默认属性的一个复写;
    152          -->
    153         <table schema="test_mybatis" tableName="employee"
    154             domainObjectName="Employee" >
    155             <!-- 如果设置为true,生成的model类会直接使用column本身的名字,而不会再使用驼峰命名方法,比如BORN_DATE,生成的属性名字就是BORN_DATE,而不会是bornDate -->
    156             <property name="useActualColumnNames" value="false" />
    157             <!-- generatedKey用于生成生成主键的方法,
    158                 如果设置了该元素,MBG会在生成的<insert>元素中生成一条正确的<selectKey>元素,该元素可选
    159                 column:主键的列名;
    160                 sqlStatement:要生成的selectKey语句,有以下可选项:
    161                     Cloudscape:相当于selectKey的SQL为: VALUES IDENTITY_VAL_LOCAL()
    162                     DB2       :相当于selectKey的SQL为: VALUES IDENTITY_VAL_LOCAL()
    163                     DB2_MF    :相当于selectKey的SQL为:SELECT IDENTITY_VAL_LOCAL() FROM SYSIBM.SYSDUMMY1
    164                     Derby      :相当于selectKey的SQL为:VALUES IDENTITY_VAL_LOCAL()
    165                     HSQLDB      :相当于selectKey的SQL为:CALL IDENTITY()
    166                     Informix  :相当于selectKey的SQL为:select dbinfo('sqlca.sqlerrd1') from systables where tabid=1
    167                     MySql      :相当于selectKey的SQL为:SELECT LAST_INSERT_ID()
    168                     SqlServer :相当于selectKey的SQL为:SELECT SCOPE_IDENTITY()
    169                     SYBASE      :相当于selectKey的SQL为:SELECT @@IDENTITY
    170                     JDBC      :相当于在生成的insert元素上添加useGeneratedKeys="true"和keyProperty属性
    171             -->
    172             <generatedKey column="ID" sqlStatement="MySql"
    173                 identity="true" />
    174             <!-- 用来修改表中某个列的属性,MBG会使用修改后的列来生成domain的属性;
    175                  column:要重新设置的列名;
    176                  注意,一个table元素中可以有多个columnOverride元素哈~
    177             -->
    178             <columnOverride column="DATE_FIELD"
    179                 property="startDate" />
    180             <!-- ignoreColumn设置一个MGB忽略的列,如果设置了改列,那么在生成的domain中,生成的SQL中,都不会有该列出现 
    181                  column:指定要忽略的列的名字;
    182                  delimitedColumnName:参考table元素的delimitAllColumns配置,默认为false
    183                  注意,一个table元素中可以有多个ignoreColumn元素    
    184             -->
    185             <ignoreColumn column="dept_id" />
    186             <columnOverride column="gender" jdbcType="VARCHAR" />
    187             
    188         </table>
    189 
    190     </context>
    191 </generatorConfiguration>

        c、使用命令:java -jar mybatis-generator-core-1.3.7.jar -configfile mbg.xml -overwrite

        d、查看生成目录文件:

     1 package com.test.mybatis.pojo;
     2 
     3 public class Employee {
     4     private Integer id;
     5 
     6     private String lastName;
     7 
     8     private String gender;
     9 
    10     private String email;
    11 
    12     public Integer getId() {
    13         return id;
    14     }
    15 
    16     public void setId(Integer id) {
    17         this.id = id;
    18     }
    19 
    20     public String getLastName() {
    21         return lastName;
    22     }
    23 
    24     public void setLastName(String lastName) {
    25         this.lastName = lastName;
    26     }
    27 
    28     public String getGender() {
    29         return gender;
    30     }
    31 
    32     public void setGender(String gender) {
    33         this.gender = gender;
    34     }
    35 
    36     public String getEmail() {
    37         return email;
    38     }
    39 
    40     public void setEmail(String email) {
    41         this.email = email;
    42     }
    43 }
    Employee.java
      1 package com.test.mybatis.pojo;
      2 
      3 import java.util.ArrayList;
      4 import java.util.List;
      5 
      6 public class EmployeeExample {
      7     protected String orderByClause;
      8 
      9     protected boolean distinct;
     10 
     11     protected List<Criteria> oredCriteria;
     12 
     13     public EmployeeExample() {
     14         oredCriteria = new ArrayList<Criteria>();
     15     }
     16 
     17     public void setOrderByClause(String orderByClause) {
     18         this.orderByClause = orderByClause;
     19     }
     20 
     21     public String getOrderByClause() {
     22         return orderByClause;
     23     }
     24 
     25     public void setDistinct(boolean distinct) {
     26         this.distinct = distinct;
     27     }
     28 
     29     public boolean isDistinct() {
     30         return distinct;
     31     }
     32 
     33     public List<Criteria> getOredCriteria() {
     34         return oredCriteria;
     35     }
     36 
     37     public void or(Criteria criteria) {
     38         oredCriteria.add(criteria);
     39     }
     40 
     41     public Criteria or() {
     42         Criteria criteria = createCriteriaInternal();
     43         oredCriteria.add(criteria);
     44         return criteria;
     45     }
     46 
     47     public Criteria createCriteria() {
     48         Criteria criteria = createCriteriaInternal();
     49         if (oredCriteria.size() == 0) {
     50             oredCriteria.add(criteria);
     51         }
     52         return criteria;
     53     }
     54 
     55     protected Criteria createCriteriaInternal() {
     56         Criteria criteria = new Criteria();
     57         return criteria;
     58     }
     59 
     60     public void clear() {
     61         oredCriteria.clear();
     62         orderByClause = null;
     63         distinct = false;
     64     }
     65 
     66     protected abstract static class GeneratedCriteria {
     67         protected List<Criterion> criteria;
     68 
     69         protected GeneratedCriteria() {
     70             super();
     71             criteria = new ArrayList<Criterion>();
     72         }
     73 
     74         public boolean isValid() {
     75             return criteria.size() > 0;
     76         }
     77 
     78         public List<Criterion> getAllCriteria() {
     79             return criteria;
     80         }
     81 
     82         public List<Criterion> getCriteria() {
     83             return criteria;
     84         }
     85 
     86         protected void addCriterion(String condition) {
     87             if (condition == null) {
     88                 throw new RuntimeException("Value for condition cannot be null");
     89             }
     90             criteria.add(new Criterion(condition));
     91         }
     92 
     93         protected void addCriterion(String condition, Object value, String property) {
     94             if (value == null) {
     95                 throw new RuntimeException("Value for " + property + " cannot be null");
     96             }
     97             criteria.add(new Criterion(condition, value));
     98         }
     99 
    100         protected void addCriterion(String condition, Object value1, Object value2, String property) {
    101             if (value1 == null || value2 == null) {
    102                 throw new RuntimeException("Between values for " + property + " cannot be null");
    103             }
    104             criteria.add(new Criterion(condition, value1, value2));
    105         }
    106 
    107         public Criteria andIdIsNull() {
    108             addCriterion("id is null");
    109             return (Criteria) this;
    110         }
    111 
    112         public Criteria andIdIsNotNull() {
    113             addCriterion("id is not null");
    114             return (Criteria) this;
    115         }
    116 
    117         public Criteria andIdEqualTo(Integer value) {
    118             addCriterion("id =", value, "id");
    119             return (Criteria) this;
    120         }
    121 
    122         public Criteria andIdNotEqualTo(Integer value) {
    123             addCriterion("id <>", value, "id");
    124             return (Criteria) this;
    125         }
    126 
    127         public Criteria andIdGreaterThan(Integer value) {
    128             addCriterion("id >", value, "id");
    129             return (Criteria) this;
    130         }
    131 
    132         public Criteria andIdGreaterThanOrEqualTo(Integer value) {
    133             addCriterion("id >=", value, "id");
    134             return (Criteria) this;
    135         }
    136 
    137         public Criteria andIdLessThan(Integer value) {
    138             addCriterion("id <", value, "id");
    139             return (Criteria) this;
    140         }
    141 
    142         public Criteria andIdLessThanOrEqualTo(Integer value) {
    143             addCriterion("id <=", value, "id");
    144             return (Criteria) this;
    145         }
    146 
    147         public Criteria andIdIn(List<Integer> values) {
    148             addCriterion("id in", values, "id");
    149             return (Criteria) this;
    150         }
    151 
    152         public Criteria andIdNotIn(List<Integer> values) {
    153             addCriterion("id not in", values, "id");
    154             return (Criteria) this;
    155         }
    156 
    157         public Criteria andIdBetween(Integer value1, Integer value2) {
    158             addCriterion("id between", value1, value2, "id");
    159             return (Criteria) this;
    160         }
    161 
    162         public Criteria andIdNotBetween(Integer value1, Integer value2) {
    163             addCriterion("id not between", value1, value2, "id");
    164             return (Criteria) this;
    165         }
    166 
    167         public Criteria andLastNameIsNull() {
    168             addCriterion("last_name is null");
    169             return (Criteria) this;
    170         }
    171 
    172         public Criteria andLastNameIsNotNull() {
    173             addCriterion("last_name is not null");
    174             return (Criteria) this;
    175         }
    176 
    177         public Criteria andLastNameEqualTo(String value) {
    178             addCriterion("last_name =", value, "lastName");
    179             return (Criteria) this;
    180         }
    181 
    182         public Criteria andLastNameNotEqualTo(String value) {
    183             addCriterion("last_name <>", value, "lastName");
    184             return (Criteria) this;
    185         }
    186 
    187         public Criteria andLastNameGreaterThan(String value) {
    188             addCriterion("last_name >", value, "lastName");
    189             return (Criteria) this;
    190         }
    191 
    192         public Criteria andLastNameGreaterThanOrEqualTo(String value) {
    193             addCriterion("last_name >=", value, "lastName");
    194             return (Criteria) this;
    195         }
    196 
    197         public Criteria andLastNameLessThan(String value) {
    198             addCriterion("last_name <", value, "lastName");
    199             return (Criteria) this;
    200         }
    201 
    202         public Criteria andLastNameLessThanOrEqualTo(String value) {
    203             addCriterion("last_name <=", value, "lastName");
    204             return (Criteria) this;
    205         }
    206 
    207         public Criteria andLastNameLike(String value) {
    208             addCriterion("last_name like", value, "lastName");
    209             return (Criteria) this;
    210         }
    211 
    212         public Criteria andLastNameNotLike(String value) {
    213             addCriterion("last_name not like", value, "lastName");
    214             return (Criteria) this;
    215         }
    216 
    217         public Criteria andLastNameIn(List<String> values) {
    218             addCriterion("last_name in", values, "lastName");
    219             return (Criteria) this;
    220         }
    221 
    222         public Criteria andLastNameNotIn(List<String> values) {
    223             addCriterion("last_name not in", values, "lastName");
    224             return (Criteria) this;
    225         }
    226 
    227         public Criteria andLastNameBetween(String value1, String value2) {
    228             addCriterion("last_name between", value1, value2, "lastName");
    229             return (Criteria) this;
    230         }
    231 
    232         public Criteria andLastNameNotBetween(String value1, String value2) {
    233             addCriterion("last_name not between", value1, value2, "lastName");
    234             return (Criteria) this;
    235         }
    236 
    237         public Criteria andGenderIsNull() {
    238             addCriterion("gender is null");
    239             return (Criteria) this;
    240         }
    241 
    242         public Criteria andGenderIsNotNull() {
    243             addCriterion("gender is not null");
    244             return (Criteria) this;
    245         }
    246 
    247         public Criteria andGenderEqualTo(String value) {
    248             addCriterion("gender =", value, "gender");
    249             return (Criteria) this;
    250         }
    251 
    252         public Criteria andGenderNotEqualTo(String value) {
    253             addCriterion("gender <>", value, "gender");
    254             return (Criteria) this;
    255         }
    256 
    257         public Criteria andGenderGreaterThan(String value) {
    258             addCriterion("gender >", value, "gender");
    259             return (Criteria) this;
    260         }
    261 
    262         public Criteria andGenderGreaterThanOrEqualTo(String value) {
    263             addCriterion("gender >=", value, "gender");
    264             return (Criteria) this;
    265         }
    266 
    267         public Criteria andGenderLessThan(String value) {
    268             addCriterion("gender <", value, "gender");
    269             return (Criteria) this;
    270         }
    271 
    272         public Criteria andGenderLessThanOrEqualTo(String value) {
    273             addCriterion("gender <=", value, "gender");
    274             return (Criteria) this;
    275         }
    276 
    277         public Criteria andGenderLike(String value) {
    278             addCriterion("gender like", value, "gender");
    279             return (Criteria) this;
    280         }
    281 
    282         public Criteria andGenderNotLike(String value) {
    283             addCriterion("gender not like", value, "gender");
    284             return (Criteria) this;
    285         }
    286 
    287         public Criteria andGenderIn(List<String> values) {
    288             addCriterion("gender in", values, "gender");
    289             return (Criteria) this;
    290         }
    291 
    292         public Criteria andGenderNotIn(List<String> values) {
    293             addCriterion("gender not in", values, "gender");
    294             return (Criteria) this;
    295         }
    296 
    297         public Criteria andGenderBetween(String value1, String value2) {
    298             addCriterion("gender between", value1, value2, "gender");
    299             return (Criteria) this;
    300         }
    301 
    302         public Criteria andGenderNotBetween(String value1, String value2) {
    303             addCriterion("gender not between", value1, value2, "gender");
    304             return (Criteria) this;
    305         }
    306 
    307         public Criteria andEmailIsNull() {
    308             addCriterion("email is null");
    309             return (Criteria) this;
    310         }
    311 
    312         public Criteria andEmailIsNotNull() {
    313             addCriterion("email is not null");
    314             return (Criteria) this;
    315         }
    316 
    317         public Criteria andEmailEqualTo(String value) {
    318             addCriterion("email =", value, "email");
    319             return (Criteria) this;
    320         }
    321 
    322         public Criteria andEmailNotEqualTo(String value) {
    323             addCriterion("email <>", value, "email");
    324             return (Criteria) this;
    325         }
    326 
    327         public Criteria andEmailGreaterThan(String value) {
    328             addCriterion("email >", value, "email");
    329             return (Criteria) this;
    330         }
    331 
    332         public Criteria andEmailGreaterThanOrEqualTo(String value) {
    333             addCriterion("email >=", value, "email");
    334             return (Criteria) this;
    335         }
    336 
    337         public Criteria andEmailLessThan(String value) {
    338             addCriterion("email <", value, "email");
    339             return (Criteria) this;
    340         }
    341 
    342         public Criteria andEmailLessThanOrEqualTo(String value) {
    343             addCriterion("email <=", value, "email");
    344             return (Criteria) this;
    345         }
    346 
    347         public Criteria andEmailLike(String value) {
    348             addCriterion("email like", value, "email");
    349             return (Criteria) this;
    350         }
    351 
    352         public Criteria andEmailNotLike(String value) {
    353             addCriterion("email not like", value, "email");
    354             return (Criteria) this;
    355         }
    356 
    357         public Criteria andEmailIn(List<String> values) {
    358             addCriterion("email in", values, "email");
    359             return (Criteria) this;
    360         }
    361 
    362         public Criteria andEmailNotIn(List<String> values) {
    363             addCriterion("email not in", values, "email");
    364             return (Criteria) this;
    365         }
    366 
    367         public Criteria andEmailBetween(String value1, String value2) {
    368             addCriterion("email between", value1, value2, "email");
    369             return (Criteria) this;
    370         }
    371 
    372         public Criteria andEmailNotBetween(String value1, String value2) {
    373             addCriterion("email not between", value1, value2, "email");
    374             return (Criteria) this;
    375         }
    376     }
    377 
    378     public static class Criteria extends GeneratedCriteria {
    379 
    380         protected Criteria() {
    381             super();
    382         }
    383     }
    384 
    385     public static class Criterion {
    386         private String condition;
    387 
    388         private Object value;
    389 
    390         private Object secondValue;
    391 
    392         private boolean noValue;
    393 
    394         private boolean singleValue;
    395 
    396         private boolean betweenValue;
    397 
    398         private boolean listValue;
    399 
    400         private String typeHandler;
    401 
    402         public String getCondition() {
    403             return condition;
    404         }
    405 
    406         public Object getValue() {
    407             return value;
    408         }
    409 
    410         public Object getSecondValue() {
    411             return secondValue;
    412         }
    413 
    414         public boolean isNoValue() {
    415             return noValue;
    416         }
    417 
    418         public boolean isSingleValue() {
    419             return singleValue;
    420         }
    421 
    422         public boolean isBetweenValue() {
    423             return betweenValue;
    424         }
    425 
    426         public boolean isListValue() {
    427             return listValue;
    428         }
    429 
    430         public String getTypeHandler() {
    431             return typeHandler;
    432         }
    433 
    434         protected Criterion(String condition) {
    435             super();
    436             this.condition = condition;
    437             this.typeHandler = null;
    438             this.noValue = true;
    439         }
    440 
    441         protected Criterion(String condition, Object value, String typeHandler) {
    442             super();
    443             this.condition = condition;
    444             this.value = value;
    445             this.typeHandler = typeHandler;
    446             if (value instanceof List<?>) {
    447                 this.listValue = true;
    448             } else {
    449                 this.singleValue = true;
    450             }
    451         }
    452 
    453         protected Criterion(String condition, Object value) {
    454             this(condition, value, null);
    455         }
    456 
    457         protected Criterion(String condition, Object value, Object secondValue, String typeHandler) {
    458             super();
    459             this.condition = condition;
    460             this.value = value;
    461             this.secondValue = secondValue;
    462             this.typeHandler = typeHandler;
    463             this.betweenValue = true;
    464         }
    465 
    466         protected Criterion(String condition, Object value, Object secondValue) {
    467             this(condition, value, secondValue, null);
    468         }
    469     }
    470 }
    EmployeeExample.java
     1 package com.test.mybatis.dao;
     2 
     3 import com.test.mybatis.pojo.Employee;
     4 import com.test.mybatis.pojo.EmployeeExample;
     5 import java.util.List;
     6 import org.apache.ibatis.annotations.Param;
     7 
     8 public interface EmployeeMapper {
     9     long countByExample(EmployeeExample example);
    10 
    11     int deleteByExample(EmployeeExample example);
    12 
    13     int deleteByPrimaryKey(Integer id);
    14 
    15     int insert(Employee record);
    16 
    17     int insertSelective(Employee record);
    18 
    19     List<Employee> selectByExample(EmployeeExample example);
    20 
    21     Employee selectByPrimaryKey(Integer id);
    22 
    23     int updateByExampleSelective(@Param("record") Employee record, @Param("example") EmployeeExample example);
    24 
    25     int updateByExample(@Param("record") Employee record, @Param("example") EmployeeExample example);
    26 
    27     int updateByPrimaryKeySelective(Employee record);
    28 
    29     int updateByPrimaryKey(Employee record);
    30 }
    EmployeeMapper.java
      1 <?xml version="1.0" encoding="UTF-8"?>
      2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
      3 <mapper namespace="com.test.mybatis.dao.EmployeeMapper">
      4   <resultMap id="BaseResultMap" type="com.test.mybatis.pojo.Employee">
      5     <id column="id" jdbcType="INTEGER" property="id" />
      6     <result column="last_name" jdbcType="VARCHAR" property="lastName" />
      7     <result column="gender" jdbcType="VARCHAR" property="gender" />
      8     <result column="email" jdbcType="VARCHAR" property="email" />
      9   </resultMap>
     10   <sql id="Example_Where_Clause">
     11     <where>
     12       <foreach collection="oredCriteria" item="criteria" separator="or">
     13         <if test="criteria.valid">
     14           <trim prefix="(" prefixOverrides="and" suffix=")">
     15             <foreach collection="criteria.criteria" item="criterion">
     16               <choose>
     17                 <when test="criterion.noValue">
     18                   and ${criterion.condition}
     19                 </when>
     20                 <when test="criterion.singleValue">
     21                   and ${criterion.condition} #{criterion.value}
     22                 </when>
     23                 <when test="criterion.betweenValue">
     24                   and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
     25                 </when>
     26                 <when test="criterion.listValue">
     27                   and ${criterion.condition}
     28                   <foreach close=")" collection="criterion.value" item="listItem" open="(" separator=",">
     29                     #{listItem}
     30                   </foreach>
     31                 </when>
     32               </choose>
     33             </foreach>
     34           </trim>
     35         </if>
     36       </foreach>
     37     </where>
     38   </sql>
     39   <sql id="Update_By_Example_Where_Clause">
     40     <where>
     41       <foreach collection="example.oredCriteria" item="criteria" separator="or">
     42         <if test="criteria.valid">
     43           <trim prefix="(" prefixOverrides="and" suffix=")">
     44             <foreach collection="criteria.criteria" item="criterion">
     45               <choose>
     46                 <when test="criterion.noValue">
     47                   and ${criterion.condition}
     48                 </when>
     49                 <when test="criterion.singleValue">
     50                   and ${criterion.condition} #{criterion.value}
     51                 </when>
     52                 <when test="criterion.betweenValue">
     53                   and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
     54                 </when>
     55                 <when test="criterion.listValue">
     56                   and ${criterion.condition}
     57                   <foreach close=")" collection="criterion.value" item="listItem" open="(" separator=",">
     58                     #{listItem}
     59                   </foreach>
     60                 </when>
     61               </choose>
     62             </foreach>
     63           </trim>
     64         </if>
     65       </foreach>
     66     </where>
     67   </sql>
     68   <sql id="Base_Column_List">
     69     id, last_name, gender, email
     70   </sql>
     71   <select id="selectByExample" parameterType="com.test.mybatis.pojo.EmployeeExample" resultMap="BaseResultMap">
     72     select
     73     <if test="distinct">
     74       distinct
     75     </if>
     76     <include refid="Base_Column_List" />
     77     from employee
     78     <if test="_parameter != null">
     79       <include refid="Example_Where_Clause" />
     80     </if>
     81     <if test="orderByClause != null">
     82       order by ${orderByClause}
     83     </if>
     84   </select>
     85   <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
     86     select 
     87     <include refid="Base_Column_List" />
     88     from employee
     89     where id = #{id,jdbcType=INTEGER}
     90   </select>
     91   <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
     92     delete from employee
     93     where id = #{id,jdbcType=INTEGER}
     94   </delete>
     95   <delete id="deleteByExample" parameterType="com.test.mybatis.pojo.EmployeeExample">
     96     delete from employee
     97     <if test="_parameter != null">
     98       <include refid="Example_Where_Clause" />
     99     </if>
    100   </delete>
    101   <insert id="insert" parameterType="com.test.mybatis.pojo.Employee">
    102     <selectKey keyProperty="id" order="AFTER" resultType="java.lang.Integer">
    103       SELECT LAST_INSERT_ID()
    104     </selectKey>
    105     insert into employee (last_name, gender, email
    106       )
    107     values (#{lastName,jdbcType=VARCHAR}, #{gender,jdbcType=VARCHAR}, #{email,jdbcType=VARCHAR}
    108       )
    109   </insert>
    110   <insert id="insertSelective" parameterType="com.test.mybatis.pojo.Employee">
    111     <selectKey keyProperty="id" order="AFTER" resultType="java.lang.Integer">
    112       SELECT LAST_INSERT_ID()
    113     </selectKey>
    114     insert into employee
    115     <trim prefix="(" suffix=")" suffixOverrides=",">
    116       <if test="lastName != null">
    117         last_name,
    118       </if>
    119       <if test="gender != null">
    120         gender,
    121       </if>
    122       <if test="email != null">
    123         email,
    124       </if>
    125     </trim>
    126     <trim prefix="values (" suffix=")" suffixOverrides=",">
    127       <if test="lastName != null">
    128         #{lastName,jdbcType=VARCHAR},
    129       </if>
    130       <if test="gender != null">
    131         #{gender,jdbcType=VARCHAR},
    132       </if>
    133       <if test="email != null">
    134         #{email,jdbcType=VARCHAR},
    135       </if>
    136     </trim>
    137   </insert>
    138   <select id="countByExample" parameterType="com.test.mybatis.pojo.EmployeeExample" resultType="java.lang.Long">
    139     select count(*) from employee
    140     <if test="_parameter != null">
    141       <include refid="Example_Where_Clause" />
    142     </if>
    143   </select>
    144   <update id="updateByExampleSelective" parameterType="map">
    145     update employee
    146     <set>
    147       <if test="record.id != null">
    148         id = #{record.id,jdbcType=INTEGER},
    149       </if>
    150       <if test="record.lastName != null">
    151         last_name = #{record.lastName,jdbcType=VARCHAR},
    152       </if>
    153       <if test="record.gender != null">
    154         gender = #{record.gender,jdbcType=VARCHAR},
    155       </if>
    156       <if test="record.email != null">
    157         email = #{record.email,jdbcType=VARCHAR},
    158       </if>
    159     </set>
    160     <if test="_parameter != null">
    161       <include refid="Update_By_Example_Where_Clause" />
    162     </if>
    163   </update>
    164   <update id="updateByExample" parameterType="map">
    165     update employee
    166     set id = #{record.id,jdbcType=INTEGER},
    167       last_name = #{record.lastName,jdbcType=VARCHAR},
    168       gender = #{record.gender,jdbcType=VARCHAR},
    169       email = #{record.email,jdbcType=VARCHAR}
    170     <if test="_parameter != null">
    171       <include refid="Update_By_Example_Where_Clause" />
    172     </if>
    173   </update>
    174   <update id="updateByPrimaryKeySelective" parameterType="com.test.mybatis.pojo.Employee">
    175     update employee
    176     <set>
    177       <if test="lastName != null">
    178         last_name = #{lastName,jdbcType=VARCHAR},
    179       </if>
    180       <if test="gender != null">
    181         gender = #{gender,jdbcType=VARCHAR},
    182       </if>
    183       <if test="email != null">
    184         email = #{email,jdbcType=VARCHAR},
    185       </if>
    186     </set>
    187     where id = #{id,jdbcType=INTEGER}
    188   </update>
    189   <update id="updateByPrimaryKey" parameterType="com.test.mybatis.pojo.Employee">
    190     update employee
    191     set last_name = #{lastName,jdbcType=VARCHAR},
    192       gender = #{gender,jdbcType=VARCHAR},
    193       email = #{email,jdbcType=VARCHAR}
    194     where id = #{id,jdbcType=INTEGER}
    195   </update>
    196 </mapper>
    EmployeeMapper.xml

      2、使用java代码方式

        a、pom中引入mybatis-generator-core依赖

    1 <dependency>
    2     <groupId>org.mybatis.generator</groupId>
    3     <artifactId>mybatis-generator-core</artifactId>
    4     <version>1.3.7</version>
    5 </dependency>

        b、代码

     1 package com.test.mybatis.generator;
     2 
     3 import java.io.InputStream;
     4 import java.util.ArrayList;
     5 import java.util.List;
     6 
     7 import org.apache.ibatis.io.Resources;
     8 import org.mybatis.generator.api.MyBatisGenerator;
     9 import org.mybatis.generator.config.Configuration;
    10 import org.mybatis.generator.config.xml.ConfigurationParser;
    11 import org.mybatis.generator.internal.DefaultShellCallback;
    12 
    13 public class TestMBG {
    14 
    15     public static void main(String[] args) throws Exception {
    16         List<String> warnings = new ArrayList<String>();
    17         boolean overwrite = true;
    18         // File configFile = new File("mbg.xml");
    19         InputStream inputStream = Resources.getResourceAsStream("mbg.xml");
    20 
    21         ConfigurationParser cp = new ConfigurationParser(warnings);
    22         Configuration config = cp.parseConfiguration(inputStream);
    23         DefaultShellCallback callback = new DefaultShellCallback(overwrite);
    24         MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
    25         myBatisGenerator.generate(null);
    26     }
    27 }

       3、使用maven插件mybatis-generator-plus

        a、pom文件

     1 <build>
     2     <plugins>
     3         <plugin>
     4             <groupId>org.mybatis.generator</groupId>
     5             <artifactId>mybatis-generator-maven-plugin</artifactId>
     6             <version>1.3.7</version>
     7             <dependencies>
     8                 <dependency>
     9                     <groupId>mysql</groupId>
    10                     <artifactId>mysql-connector-java</artifactId>
    11                     <version>8.0.13</version>
    12                 </dependency>
    13             </dependencies>
    14             <configuration>
    15                 <!-- mybatis用于生成代码的配置文件 -->
    16                 <configurationFile>src/main/resources/mbg.xml</configurationFile>
    17                 <verbose>true</verbose>
    18                 <overwrite>true</overwrite>
    19             </configuration>
    20         </plugin>
    21     </plugins>
    22 </build>

        b、mvn命令:mybatis-generator:generate

      

      

  • 相关阅读:
    YL杯超级篮球赛 (Standard IO)
    Window (Standard IO)
    toj1026 Network 双连通分量
    poj3177 Redundant Paths 双连通分量
    poj1144 Network 双连通分量
    bzoj1269
    bzoj1800
    CF911D
    CF910C
    CF910B
  • 原文地址:https://www.cnblogs.com/h--d/p/10909448.html
Copyright © 2020-2023  润新知