MyBatis Generator 拓展包的使用

小咪咪 2021-12-01 12:08 626阅读 0赞

> [https://github.com/itfsw/mybatis-generator-plugin][https_github.com_itfsw_mybatis-generator-plugin]

一 、 代码自动生成配置  
Step1：添加依赖  
配置pom.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.1.6.RELEASE</version>
            <relativePath/> 
        </parent>
        <groupId>me.liangyating</groupId>
        <artifactId>generator</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>generator</name>
        <description>Demo project for Spring Boot</description>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>1.3.2</version>
            </dependency>
    
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>8.0.11</version>
            </dependency>
    
            <dependency>
                <groupId>com.itfsw</groupId>
                <artifactId>mybatis-generator-plugin</artifactId>
                <version>1.3.5</version>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
    
                <plugin>
                    <groupId>org.mybatis.generator</groupId>
                    <artifactId>mybatis-generator-maven-plugin</artifactId>
                    <version>1.3.7</version>
                    <dependencies>
                        <dependency>
                            <groupId>mysql</groupId>
                            <artifactId>mysql-connector-java</artifactId>
                            <version>8.0.11</version>
                        </dependency>
                        <dependency>
                            <groupId>org.mybatis.generator</groupId>
                            <artifactId>mybatis-generator-core</artifactId>
                            <version>1.3.7</version>
                        </dependency>
                        <dependency>
                            <groupId>com.itfsw</groupId>
                            <artifactId>mybatis-generator-plugin</artifactId>
                            <version>1.3.5</version>
                        </dependency>
                    </dependencies>
                    <executions>
                        <execution>
                            <id>Generate MyBatis Artifacts</id>
                            <phase>package</phase>
                            <goals>
                                <goal>generate</goal>
                            </goals>
                        </execution>
                    </executions>
                    <configuration>
                        
                        <verbose>true</verbose>
                        
                        <overwrite>true</overwrite>
                        
                        <configurationFile>generatorConfig.xml</configurationFile>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    
    </project>

Step2：添加配置文件  
根据上面在pom里的配置，我们需要添加generatorConfig.xml在项目的根目录：

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE generatorConfiguration
            PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
            "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
    <generatorConfiguration>
        
        <properties resource="application.properties"/>
        
        <context id="mysqlgenerator" targetRuntime="MyBatis3" defaultModelType="flat">
            
            <property name="mybatisVersion" value="3.4.0"/>
            <property name="autoDelimitKeywords" value="true" />
            <property name="beginningDelimiter" value="`" />
            <property name="endingDelimiter" value="`" />
            <property name="javaFileEncoding" value="utf-8" />
            <plugin type="org.mybatis.generator.plugins.SerializablePlugin" />
    
            <plugin type="org.mybatis.generator.plugins.ToStringPlugin" />
    
            
            <plugin type="com.itfsw.mybatis.generator.plugins.SelectOneByExamplePlugin"/>
            
            <plugin type="com.itfsw.mybatis.generator.plugins.LimitPlugin"/>
            
            <plugin type="com.itfsw.mybatis.generator.plugins.ModelBuilderPlugin"/>
            
            <plugin type="com.itfsw.mybatis.generator.plugins.ExampleEnhancedPlugin"/>
            
            <plugin type="com.itfsw.mybatis.generator.plugins.ExampleTargetPlugin">
                
                <property name="targetPackage" value="me.liangyating.mcqs.entity.example"/>
            </plugin>
            
            <plugin type="com.itfsw.mybatis.generator.plugins.BatchInsertPlugin"/>
            
            <plugin type="com.itfsw.mybatis.generator.plugins.ModelColumnPlugin"/>
            
            <plugin type="com.itfsw.mybatis.generator.plugins.UpsertPlugin"/>
            
            <plugin type="com.itfsw.mybatis.generator.plugins.LogicalDeletePlugin">
                
                
                <property name="logicalDeleteColumn" value="del_flag"/>
                
                <property name="logicalDeleteValue" value="1"/>
                
                <property name="logicalUnDeleteValue" value="0"/>
            </plugin>
    
            
            <commentGenerator >
                <property name="suppressAllComments" value="false"/>
                <property name="suppressDate" value="true" /> 
            </commentGenerator>
    
            
            <jdbcConnection driverClass="${spring.datasource.driver-class-name}"
                            connectionURL="${spring.datasource.url}"
                            userId="${spring.datasource.username}"
                            password="${spring.datasource.password}">
            </jdbcConnection>
    
            
            <javaTypeResolver>
                
               
                
            </javaTypeResolver>
    
            
            <javaModelGenerator targetPackage="me.liangyating.mcqs.entity" targetProject="src/main/java">
                <property name="enableSubPackages" value="true"/>
                <property name="trimStrings" value="true"/>
            </javaModelGenerator>
    
            
            <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources/mybatis" >
                <property name="enableSubPackages" value="false" />
            </sqlMapGenerator>
    
            
            <javaClientGenerator targetPackage="me.liangyating.mcqs.dao" targetProject="src/main/java" type="XMLMAPPER" >
                <property name="enableSubPackages" value="false" />
            </javaClientGenerator>
    
    
            <table tableName="sys_user">
                <generatedKey column="id" sqlStatement="MySql" identity="true" />
            </table>
            
        </context>
    </generatorConfiguration>

Step3：配置全局属性文件  
全局属性文件application.properties的配置，和Spring Boot增加MyBatis的配置是一样的，如果你的Spring Boot项目里面已经配置了MyBatis支持，请忽略此步骤。

# MyBatis 配置
    spring.datasource.url=jdbc:mysql://localhost:3306/mcqs?characterEncoding=utf8&useSSL=false&serverTimezone=UTC&allowPublicKeyRetrieval=true
    spring.datasource.username=root
    spring.datasource.password=Qas919293
    spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
    #mybatis.type-aliases-package=me.liangyating.mcqs.mapper
    #mybatis.config-locations=classpath:mybatis/mybatis-config.xml
    mybatis.mapper-locations=classpath:mybatis/mapper/*.xml

Step4：点击Maven生成代码  
如果你使用的是IDEA，点击最右侧的Maven Projects => 点击mybatis-generator => 右键双击mybatis-generator:generate ，如下图所示：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3h1bHZlamllMDE0Mw_size_16_color_FFFFFF_t_70]  
二、 项目整体结构  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3h1bHZlamllMDE0Mw_size_16_color_FFFFFF_t_70 1]

三 、安装IDEA插件  
如果你使用的是 IDEA，那么强烈建议你安装一款免费的IDEA插件“Free MyBatis plugin”，可以实现dao到mapper xml对应方法的快速映射，点击任意一个快速调整到相应的方法，提高工作效率，效果如下图所示：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3h1bHZlamllMDE0Mw_size_16_color_FFFFFF_t_70 2]  
点击绿色的箭头直接跳转到了mapper xml对应的方法了，如下图所示：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3h1bHZlamllMDE0Mw_size_16_color_FFFFFF_t_70 3]  
可以相互点击，进行对应的跳转。

# 安装步骤 #

*  点击菜单栏Flie => Settings
 *  点击Browse repostitories…
 *  输入“Free MyBatis plugin”查找插件
 *  点击安装，重启IDEA
 *  关键步骤的截图如下：  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3h1bHZlamllMDE0Mw_size_16_color_FFFFFF_t_70 4]  
    **插件列表：**
    
     *  查询单条数据插件（SelectOneByExamplePlugin）
     *  MySQL分页插件（LimitPlugin）
     *  数据Model链式构建插件（ModelBuilderPlugin）
     *  Example Criteria 增强插件（ExampleEnhancedPlugin）
     *  Example 目标包修改插件（ExampleTargetPlugin）
     *  批量插入插件（BatchInsertPlugin）
     *  逻辑删除插件（LogicalDeletePlugin）
     *  数据Model属性对应Column获取插件（ModelColumnPlugin）
     *  存在即更新插件（UpsertPlugin）

**1. 查询单条数据插件**  
使用：

public interface TbMapper {    
        /**
         * This method was generated by MyBatis Generator.
         * This method corresponds to the database table tb
         *
         * @mbg.generated
         * @project https://github.com/itfsw/mybatis-generator-plugin
         */
        Tb selectOneByExample(TbExample example);
        
        /**
         * This method was generated by MyBatis Generator.
         * This method corresponds to the database table tb
         *
         * @mbg.generated
         * @project https://github.com/itfsw/mybatis-generator-plugin
         */
        // Model WithBLOBs 时才有
        TbWithBLOBs selectOneByExampleWithBLOBs(TbExample example);
    }

**2. MySQL分页插件**  
使用：

public class TbExample {
        /**
         * This field was generated by MyBatis Generator.
         * This field corresponds to the database table tb
         *
         * @mbg.generated
         * @project https://github.com/itfsw/mybatis-generator-plugin
         */
        protected Integer offset;
    
        /**
         * This field was generated by MyBatis Generator.
         * This field corresponds to the database table tb
         *
         * @mbg.generated
         * @project https://github.com/itfsw/mybatis-generator-plugin
         */
        protected Integer rows;
        
        /**
         * This method was generated by MyBatis Generator.
         * This method corresponds to the database table tb
         *
         * @mbg.generated
         * @project https://github.com/itfsw/mybatis-generator-plugin
         */
        public TbExample limit(Integer rows) {
            this.rows = rows;
            return this;
        }
    
        /**
         * This method was generated by MyBatis Generator.
         * This method corresponds to the database table tb
         *
         * @mbg.generated
         * @project https://github.com/itfsw/mybatis-generator-plugin
         */
        public TbExample limit(Integer offset, Integer rows) {
            this.offset = offset;
            this.rows = rows;
            return this;
        }
    
        /**
         * This method was generated by MyBatis Generator.
         * This method corresponds to the database table tb
         *
         * @mbg.generated
         * @project https://github.com/itfsw/mybatis-generator-plugin
         */
        public TbExample page(Integer page, Integer pageSize) {
            this.offset = page * pageSize;
            // !!! 如果配置了startPage且不为0
            // this.offset = (page - startPage) * pageSize;
            this.rows = pageSize;
            return this;
        }
        
        // offset 和 rows 的getter&setter
        
        // 修正了clear方法
        /**
         * This method was generated by MyBatis Generator.
         * This method corresponds to the database table tb
         *
         * @mbg.generated
         */
        public void clear() {
            oredCriteria.clear();
            orderByClause = null;
            distinct = false;
            rows = null;
            offset = null;
        }
    }
    public class Test {
        public static void main(String[] args) {
            this.tbMapper.selectByExample(
                    new TbExample()
                    .createCriteria()
                    .andField1GreaterThan(1)
                    .example()
                    .limit(10)  // 查询前10条
                    .limit(10, 10)  // 查询10~20条
                    .page(1, 10)    // 查询第2页数据（每页10条）
            );
        }
    }

**3. 数据Model链式构建插件**  
这个是仿jquery的链式调用强化了表的Model的赋值操作。  
使用：

public class Test {
        public static void main(String[] args) {
            // 直接new表Model的内部Builder类，赋值后调用build()方法返回对象
            Tb table = new Tb.Builder()
                   .field1("xx")
                   .field2("xx")
                   .field3("xx")
                   .field4("xx")
                   .build();
            // 或者使用builder静态方法创建Builder
            Tb table = Tb.builder()
                   .field1("xx")
                   .field2("xx")
                   .field3("xx")
                   .field4("xx")
                   .build();
        }
    }

**4. Example 增强插件(example,andIf,orderBy)**  
使用：

public class Test {
        public static void main(String[] args) {
            // -----------------------------------example-----------------------------------
            // 表Example.Criteria增加了工厂方法example()支持，使用后可链式构建查询条件使用example()返回Example对象
            this.tbMapper.selectByExample(
                    new TbExample()
                    .createCriteria()
                    .andField1EqualTo(1)
                    .andField2EqualTo("xxx")
                    .example()
            );
            
            // ----------------- andIf （@Deprecated 尽量使用when代替）  ---------------------
            // Criteria增强了链式调用，现在一些按条件增加的查询条件不会打乱链式调用了
            // old
            TbExample oldEx = new TbExample();
            TbExample.Criteria criteria = oldEx
                    .createCriteria()
                    .andField1EqualTo(1)
                    .andField2EqualTo("xxx");
            // 如果随机数大于0.5，附加Field3查询条件
            if (Math.random() > 0.5){
                criteria.andField3EqualTo(2)
                        .andField4EqualTo(new Date());
            }
            this.tbMapper.selectByExample(oldEx);
    
            // new
            this.tbMapper.selectByExample(
                    new TbExample()
                    .createCriteria()
                    .andField1EqualTo(1)
                    .andField2EqualTo("xxx")
                    // 如果随机数大于0.5，附加Field3查询条件
                    .andIf(Math.random() > 0.5, new TbExample.Criteria.ICriteriaAdd() {
                        @Override
                        public TbExample.Criteria add(TbExample.Criteria add) {
                            return add.andField3EqualTo(2)
                                    .andField4EqualTo(new Date());
                        }
                    })
                    // 当然最简洁的写法是采用java8的Lambda表达式，当然你的项目是Java8+
                    .andIf(Math.random() > 0.5, add -> add
                            .andField3EqualTo(2)
                            .andField4EqualTo(new Date())
                    )
                    .example()
            );
            
            // -----------------------------------when-----------------------------------
            this.tbMapper.selectByExample(
                    TbExample.newAndCreateCriteria()
                    // 如果随机数大于1，附加Field3查询条件
                    .when(Math.random() > 1, new TbExample.ICriteriaWhen() {
                        @Override
                        public void criteria(TbExample.Criteria criteria) {
                            criteria.andField3EqualTo(2);
                        }
                    })
                    // 当然最简洁的写法是采用java8的Lambda表达式，当然你的项目是Java8+
                    .when(Math.random() > 1, criteria -> criteria.andField3EqualTo(2))
                    // 也支持 if else 这种写法
                    .when(Math.random() > 1, criteria -> criteria.andField3EqualTo(2), criteria -> criteria.andField3EqualTo(3))
                    .example()
                    // example上也支持 when 方法
                    .when(true, example -> example.orderBy("field1 DESC"))
            );
            
            // -----------------------------------orderBy-----------------------------------
            // old
            TbExample ex = new TbExample();
            ex.createCriteria().andField1GreaterThan(1);
            ex.setOrderByClause("field1 DESC");
            this.tbMapper.selectByExample(ex);
    
            // new
            this.tbMapper.selectByExample(
                    new TbExample()
                    .createCriteria()
                    .andField1GreaterThan(1)
                    .example()
                    .orderBy("field1 DESC")
                    // 这个配合数据Model属性对应Column获取插件（ModelColumnPlugin）使用
                    .orderBy(Tb.Column.field1.asc(), Tb.Column.field3.desc())
            );
            
            // -----------------------------------column-----------------------------------
            this.tbMapper.selectByExample(
                    new TbExample()
                    .createCriteria()
                    .andField1EqualToColumn(Tb.Column.field2)   // where field1 = field2
                    .andField1NotEqualToColumn(Tb.Column.field2)    // where field1 <> field2
                    .andField1GreaterThanColumn(Tb.Column.field2)   // where field1 > field2
                    .andField1GreaterThanOrEqualToColumn(Tb.Column.field2)  // where field1 >= field2
                    .andField1LessThanColumn(Tb.Column.field2)  // where field1 < field2
                    .andField1LessThanOrEqualToColumn(Tb.Column.field2) // where field1 <= field2
                    .example()
            );
            
            // ---------------------------- static createCriteria  -----------------------
            // simple
            this.tbMapper.selectByExample(
                    new TbExample()
                    .createCriteria()
                    .example()
            );
            // new
            this.tbMapper.selectByExample(
                    TbExample.newAndCreateCriteria()
                    .example()
            );
        }
    }

**5. Example 目标包修改插件**  
Mybatis Generator 插件默认把Model类和Example类都生成到一个包下，这样该包下类就会很多不方便区分，该插件目的就是把Example类独立到一个新包下，方便查看。  
插件：

<plugin type="com.itfsw.mybatis.generator.plugins.ExampleTargetPlugin">
        
        <property name="targetPackage" value="com.itfsw.mybatis.generator.dao.example"/>
    </plugin>

**6. 批量插入插件**  
使用：

public class Test {
        public static void main(String[] args) {
            // 构建插入数据
            List<Tb> list = new ArrayList<>();
            list.add(
                    Tb.builder()
                    .field1(0)
                    .field2("xx0")
                    .field3(0)
                    .createTime(new Date())
                    .build()
            );
            list.add(
                    Tb.builder()
                    .field1(1)
                    .field2("xx1")
                    .field3(1)
                    .createTime(new Date())
                    .build()
            );
            // 普通插入，插入所有列
            this.tbMapper.batchInsert(list);
            // !!!下面按需插入指定列（类似于insertSelective），需要数据Model属性对应Column获取插件（ModelColumnPlugin）插件
            this.tbMapper.batchInsertSelective(list, Tb.Column.field1, Tb.Column.field2, Tb.Column.field3, Tb.Column.createTime);
            // 或者排除某些列
            this.tbMapper.batchInsertSelective(list, Tb.Column.excludes(Tb.Column.id, Tb.Column.delFlag));
        }
    }

**7. 逻辑删除插件**  
使用：

public class Test {
        public static void main(String[] args) {
            // 1. 逻辑删除ByExample
            this.tbMapper.logicalDeleteByExample(
                    new TbExample()
                    .createCriteria()
                    .andField1EqualTo(1)
                    .example()
            );
    
            // 2. 逻辑删除ByPrimaryKey
            this.tbMapper.logicalDeleteByPrimaryKey(1L);
    
            // 3. 同时Example中提供了一个快捷方法来过滤逻辑删除数据
            this.tbMapper.selectByExample(
                    new TbExample()
                    .createCriteria()
                    .andField1EqualTo(1)
                    // 新增了一个andDeleted方法过滤逻辑删除数据
                    .andLogicalDeleted(true)
                    // 当然也可直接使用逻辑删除列的查询方法，我们数据Model中定义了一个逻辑删除常量DEL_FLAG
                    .andDelFlagEqualTo(Tb.IS_DELETED)
                    .example()
            );
            
            // 4. 逻辑删除和未删除常量
            Tb tb = Tb.builder()
                    .delFlag(Tb.IS_DELETED)   // 删除
                    .delFlag(Tb.NOT_DELETED)    // 未删除
                    .build()
                    .andLogicalDeleted(true);   // 也可以在这里使用true|false设置逻辑删除
    
            // 5. selectByPrimaryKeyWithLogicalDelete V1.0.18 版本增加
            // 因为之前觉得既然拿到了主键这种查询没有必要，但是实际使用中可能存在根据主键判断是否逻辑删除的情况，这种场景还是有用的
            this.tbMapper.selectByPrimaryKeyWithLogicalDelete(1, true);
            
            // 6. 使用逻辑删除枚举
            Tb tb = Tb.builder()
                    .delFlag(Tb.DelFlag.IS_DELETED)   // 删除
                    .delFlag(Tb.DelFlag.NOT_DELETED)    // 未删除
                    .build()
                    .andLogicalDeleted(true);   // 也可以在这里使用true|false设置逻辑删除
        }
    }

**8. 数据Model属性对应Column获取插件**  
使用：

public class Test {
        public static void main(String[] args) {
            // 1. 获取Model对应column
            String column = Tb.Column.createTime.value();
    
            // 2. 配合Example Criteria 增强插件（ExampleEnhancedPlugin）使用orderBy方法
            // old
            this.tbMapper.selectByExample(
                    new TbExample()
                    .createCriteria()
                    .andField1GreaterThan(1)
                    .example()
                    .orderBy("field1 DESC, field3 ASC")
            );
    
            // better
            this.tbMapper.selectByExample(
                    new TbExample()
                    .createCriteria()
                    .andField1GreaterThan(1)
                    .example()
                    .orderBy(Tb.Column.field1.desc(), Tb.Column.field3.asc())
            );
            
            // 3. 配合批量插入插件（BatchInsertPlugin）使用实现按需插入指定列
            List<Tb> list = new ArrayList<>();
            list.add(
                    Tb.builder()
                    .field1(0)
                    .field2("xx0")
                    .field3(0)
                    .field4(new Date())
                    .build()
            );
            list.add(
                    Tb.builder()
                    .field1(1)
                    .field2("xx1")
                    .field3(1)
                    .field4(new Date())
                    .build()
            );
            // 这个会插入表所有列
            this.tbMapper.batchInsert(list);
            // 下面按需插入指定列（类似于insertSelective）
            this.tbMapper.batchInsertSelective(list, Tb.Column.field1, Tb.Column.field2, Tb.Column.field3, Tb.Column.createTime);
            
            // 4. excludes 方法
            this.tbMapper.batchInsertSelective(list, Tb.Column.excludes(Tb.Column.id, Tb.Column.delFlag));
        }
    }

**9. 存在即更新插件**  
使用：

public class Test {
        public static void main(String[] args) {
            // 1. 未入库数据入库，执行insert
            Tb tb = Tb.builder()
                    .field1(1)
                    .field2("xx0")
                    .delFlag(Tb.DEL_FLAG_ON)
                    .build();
            int k0 = this.tbMapper.upsert(tb);
            // 2. 已入库数据再次入库,执行update（！！需要注意如触发update其返回的受影响行数为2）
            tb.setField2("xx1");
            int k1 = this.tbMapper.upsert(tb);
    
            // 3. 类似insertSelective实现选择入库
            Tb tb1 = Tb.builder()
                    .field1(1)
                    .field2("xx0")
                    .build();
            int k2 = this.tbMapper.upsertSelective(tb1);
            tb1.setField2("xx1");
            int k3 = this.tbMapper.upsertSelective(tb1);
    
            // --------------------------------- allowMultiQueries=true ------------------------------
            // 4. 开启allowMultiQueries后增加upsertByExample，upsertByExampleSelective但强力建议不要使用（需保证团队没有使用statement提交sql,否则会存在sql注入风险）
            Tb tb2 = Tb.builder()
                    .field1(1)
                    .field2("xx0")
                    .field3(1003)
                    .delFlag(Tb.DEL_FLAG_ON)
                    .build();
            int k4 = this.tbMapper.upsertByExample(tb2,
                    new TbExample()
                            .createCriteria()
                            .andField3EqualTo(1003)
                            .example()
            );
            tb2.setField2("xx1");
            // !!! upsertByExample,upsertByExampleSelective触发更新时，更新条数返回是有问题的，这里只会返回0
            // 这是mybatis自身问题，也是不怎么建议开启allowMultiQueries功能原因之一
            int k5 = this.tbMapper.upsertByExample(tb2,
                    new TbExample()
                            .createCriteria()
                            .andField3EqualTo(1003)
                            .example()
            );
            // upsertByExampleSelective 用法类似
            
            // 当Model WithBLOBs 存在时上述方法增加对应的 WithBLOBs 方法，举例如下：
            TbWithBLOBs tb3 = Tb.builder()
                                .field1(1)
                                .field2("xx0")
                                .delFlag(Tb.DEL_FLAG_ON)
                                .build();
            int k6 = this.tbMapper.upsertWithBLOBs(tb);
            
            // --------------------------------- allowBatchUpsert=true ------------------------------
            List<Tb> list = new ArrayList<>();
            list.add(
                    Tb.builder()
                    .field1(0)
                    .field2("xx0")
                    .field3(0)
                    .field4(new Date())
                    .build()
            );
            list.add(
                    Tb.builder()
                    .field1(1)
                    .field2("xx1")
                    .field3(1)
                    .field4(new Date())
                    .build()
            );
            this.tbMapper.batchUpsert(list);    // 对于BLOBs 有batchUpsertWithBLOBs方法
            this.tbMapper.batchUpsertSelective(list, Tb.Column.field1, Tb.Column.field2, Tb.Column.field3, Tb.Column.createTime);
            this.tbMapper.batchUpsertSelective(list, Tb.Column.excludes(Tb.Column.id, Tb.Column.delFlag)); // 排除某些列
        }
    }

[https_github.com_itfsw_mybatis-generator-plugin]: https://github.com/itfsw/mybatis-generator-plugin
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