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 }


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 }


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 }


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>
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
来源:oschina
链接:https://my.oschina.net/u/4317546/blog/3527264