• MyBatis Generator 1.4.0 使用（基础篇）

    MyBatis Generator 1.4.0 使用（基础篇）

    注意：
    JDK版本：jdk-11.0.6
    Maven版本：apache-maven-3.6.3
    IDE版本：Spring Tool Suite 4.6.1.RELEASE
    MyBatis Generator 版本： 1.4.0
    MySQL数据库：MySQL 8.0.13

    第一部分：构建数据库

    一、表结构（User表）

    在这里插入图片描述

    二、初始数据

    在这里插入图片描述

    三、建表语句

    CREATE TABLE `user`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) NULL DEFAULT NULL,
  `age` int(11) NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) 

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    第二部分：项目搭建

    一、构建Maven项目

    项目目录结构如下：

    在这里插入图片描述

    二、添加项目依赖

    
			org.mybatis
			mybatis
			3.5.4



			org.mybatis.dynamic-sql
			mybatis-dynamic-sql
			1.1.4



			org.mybatis.generator
			mybatis-generator-maven-plugin
			1.4.0



			mysql
			mysql-connector-java
			8.0.19


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    三、创建 generatorConfig.xml 文件

    注意：这里通过插件自动创建generatorConfig.xml文件

    1、给IDE安装MyBatis Generator插件
    在这里插入图片描述
    2、搜索并安装插件

    在这里插入图片描述
    3、创建 generatorConfig.xml 文件

    项目上右键 -> new -> other

    在这里插入图片描述
    在这里插入图片描述
    4、通过插件创建的 generatorConfig.xml 文件内容如下：

    


  
    
    
    
    
    
    
      
    
      
    

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    5、generatorConfig.xml内容简要说明如下：

    具体配置内容可参考官方文档（文章末尾会提供官方网址）

    在这里插入图片描述

    四、自动生成文件

    1、运行并生成对应文件

    在这里插入图片描述
    2、生成文件目录结构

    在这里插入图片描述
    3、生成的文件内容

    UserDynamicSqlSupport.java

    package com.dao;

import java.sql.JDBCType;
import javax.annotation.Generated;
import org.mybatis.dynamic.sql.SqlColumn;
import org.mybatis.dynamic.sql.SqlTable;

public final class UserDynamicSqlSupport {
    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4817318+08:00", comments="Source Table: user")
    public static final User user = new User();

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4827334+08:00", comments="Source field: user.id")
    public static final SqlColumn id = user.id;

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4827334+08:00", comments="Source field: user.name")
    public static final SqlColumn name = user.name;

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4827334+08:00", comments="Source field: user.age")
    public static final SqlColumn age = user.age;

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4827334+08:00", comments="Source Table: user")
    public static final class User extends SqlTable {
        public final SqlColumn id = column("id", JDBCType.INTEGER);

        public final SqlColumn name = column("name", JDBCType.VARCHAR);

        public final SqlColumn age = column("age", JDBCType.INTEGER);

        public User() {
            super("user");
        }
    }
}

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    UserMapper.java

    package com.dao;

import static com.dao.UserDynamicSqlSupport.*;
import static org.mybatis.dynamic.sql.SqlBuilder.*;

import java.util.Collection;
import java.util.List;
import java.util.Optional;
import javax.annotation.Generated;
import org.apache.ibatis.annotations.DeleteProvider;
import org.apache.ibatis.annotations.InsertProvider;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.ResultMap;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.SelectProvider;
import org.apache.ibatis.annotations.UpdateProvider;
import org.apache.ibatis.type.JdbcType;
import org.mybatis.dynamic.sql.BasicColumn;
import org.mybatis.dynamic.sql.delete.DeleteDSLCompleter;
import org.mybatis.dynamic.sql.delete.render.DeleteStatementProvider;
import org.mybatis.dynamic.sql.insert.render.InsertStatementProvider;
import org.mybatis.dynamic.sql.insert.render.MultiRowInsertStatementProvider;
import org.mybatis.dynamic.sql.select.CountDSLCompleter;
import org.mybatis.dynamic.sql.select.SelectDSLCompleter;
import org.mybatis.dynamic.sql.select.render.SelectStatementProvider;
import org.mybatis.dynamic.sql.update.UpdateDSL;
import org.mybatis.dynamic.sql.update.UpdateDSLCompleter;
import org.mybatis.dynamic.sql.update.UpdateModel;
import org.mybatis.dynamic.sql.update.render.UpdateStatementProvider;
import org.mybatis.dynamic.sql.util.SqlProviderAdapter;
import org.mybatis.dynamic.sql.util.mybatis3.MyBatis3Utils;

import com.entity.User;

@Mapper
public interface UserMapper {
    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4837321+08:00", comments="Source Table: user")
    BasicColumn[] selectList = BasicColumn.columnList(id, name, age);

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4827334+08:00", comments="Source Table: user")
    @SelectProvider(type=SqlProviderAdapter.class, method="select")
    long count(SelectStatementProvider selectStatement);

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4827334+08:00", comments="Source Table: user")
    @DeleteProvider(type=SqlProviderAdapter.class, method="delete")
    int delete(DeleteStatementProvider deleteStatement);

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4827334+08:00", comments="Source Table: user")
    @InsertProvider(type=SqlProviderAdapter.class, method="insert")
    int insert(InsertStatementProvider insertStatement);

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4827334+08:00", comments="Source Table: user")
    @InsertProvider(type=SqlProviderAdapter.class, method="insertMultiple")
    int insertMultiple(MultiRowInsertStatementProvider multipleInsertStatement);

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4827334+08:00", comments="Source Table: user")
    @SelectProvider(type=SqlProviderAdapter.class, method="select")
    @ResultMap("UserResult")
    Optional selectOne(SelectStatementProvider selectStatement);

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4827334+08:00", comments="Source Table: user")
    @SelectProvider(type=SqlProviderAdapter.class, method="select")
    @Results(id="UserResult", value = {
        @Result(column="id", property="id", jdbcType=JdbcType.INTEGER, id=true),
        @Result(column="name", property="name", jdbcType=JdbcType.VARCHAR),
        @Result(column="age", property="age", jdbcType=JdbcType.INTEGER)
    })
    List selectMany(SelectStatementProvider selectStatement);

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4837321+08:00", comments="Source Table: user")
    @UpdateProvider(type=SqlProviderAdapter.class, method="update")
    int update(UpdateStatementProvider updateStatement);

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4837321+08:00", comments="Source Table: user")
    default long count(CountDSLCompleter completer) {
        return MyBatis3Utils.countFrom(this::count, user, completer);
    }

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4837321+08:00", comments="Source Table: user")
    default int delete(DeleteDSLCompleter completer) {
        return MyBatis3Utils.deleteFrom(this::delete, user, completer);
    }

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4837321+08:00", comments="Source Table: user")
    default int deleteByPrimaryKey(Integer id_) {
        return delete(c -> 
            c.where(id, isEqualTo(id_))
        );
    }

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4837321+08:00", comments="Source Table: user")
    default int insert(User record) {
        return MyBatis3Utils.insert(this::insert, record, user, c ->
            c.map(id).toProperty("id")
            .map(name).toProperty("name")
            .map(age).toProperty("age")
        );
    }

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4837321+08:00", comments="Source Table: user")
    default int insertMultiple(Collection records) {
        return MyBatis3Utils.insertMultiple(this::insertMultiple, records, user, c ->
            c.map(id).toProperty("id")
            .map(name).toProperty("name")
            .map(age).toProperty("age")
        );
    }

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4837321+08:00", comments="Source Table: user")
    default int insertSelective(User record) {
        return MyBatis3Utils.insert(this::insert, record, user, c ->
            c.map(id).toPropertyWhenPresent("id", record::getId)
            .map(name).toPropertyWhenPresent("name", record::getName)
            .map(age).toPropertyWhenPresent("age", record::getAge)
        );
    }

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4837321+08:00", comments="Source Table: user")
    default Optional selectOne(SelectDSLCompleter completer) {
        return MyBatis3Utils.selectOne(this::selectOne, selectList, user, completer);
    }

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4837321+08:00", comments="Source Table: user")
    default List select(SelectDSLCompleter completer) {
        return MyBatis3Utils.selectList(this::selectMany, selectList, user, completer);
    }

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4837321+08:00", comments="Source Table: user")
    default List selectDistinct(SelectDSLCompleter completer) {
        return MyBatis3Utils.selectDistinct(this::selectMany, selectList, user, completer);
    }

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4847324+08:00", comments="Source Table: user")
    default Optional selectByPrimaryKey(Integer id_) {
        return selectOne(c ->
            c.where(id, isEqualTo(id_))
        );
    }

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4847324+08:00", comments="Source Table: user")
    default int update(UpdateDSLCompleter completer) {
        return MyBatis3Utils.update(this::update, user, completer);
    }

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4847324+08:00", comments="Source Table: user")
    static UpdateDSL updateAllColumns(User record, UpdateDSL dsl) {
        return dsl.set(id).equalTo(record::getId)
                .set(name).equalTo(record::getName)
                .set(age).equalTo(record::getAge);
    }

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4847324+08:00", comments="Source Table: user")
    static UpdateDSL updateSelectiveColumns(User record, UpdateDSL dsl) {
        return dsl.set(id).equalToWhenPresent(record::getId)
                .set(name).equalToWhenPresent(record::getName)
                .set(age).equalToWhenPresent(record::getAge);
    }

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4847324+08:00", comments="Source Table: user")
    default int updateByPrimaryKey(User record) {
        return update(c ->
            c.set(name).equalTo(record::getName)
            .set(age).equalTo(record::getAge)
            .where(id, isEqualTo(record::getId))
        );
    }

    @Generated(value="org.mybatis.generator.api.MyBatisGenerator", date="2020-05-15T17:00:52.4847324+08:00", comments="Source Table: user")
    default int updateByPrimaryKeySelective(User record) {
        return update(c ->
            c.set(name).equalToWhenPresent(record::getName)
            .set(age).equalToWhenPresent(record::getAge)
            .where(id, isEqualTo(record::getId))
        );
    }
}

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    User.java

    package com.entity;

import javax.annotation.Generated;

public class User {
	@Generated(value = "org.mybatis.generator.api.MyBatisGenerator", date = "2020-05-15T17:00:52.4787336+08:00", comments = "Source field: user.id")
	private Integer id;

	@Generated(value = "org.mybatis.generator.api.MyBatisGenerator", date = "2020-05-15T17:00:52.4787336+08:00", comments = "Source field: user.name")
	private String name;

	@Generated(value = "org.mybatis.generator.api.MyBatisGenerator", date = "2020-05-15T17:00:52.4797336+08:00", comments = "Source field: user.age")
	private Integer age;

	@Generated(value = "org.mybatis.generator.api.MyBatisGenerator", date = "2020-05-15T17:00:52.4787336+08:00", comments = "Source field: user.id")
	public Integer getId() {
		return id;
	}

	@Generated(value = "org.mybatis.generator.api.MyBatisGenerator", date = "2020-05-15T17:00:52.4787336+08:00", comments = "Source field: user.id")
	public void setId(Integer id) {
		this.id = id;
	}

	@Generated(value = "org.mybatis.generator.api.MyBatisGenerator", date = "2020-05-15T17:00:52.4797336+08:00", comments = "Source field: user.name")
	public String getName() {
		return name;
	}

	@Generated(value = "org.mybatis.generator.api.MyBatisGenerator", date = "2020-05-15T17:00:52.4797336+08:00", comments = "Source field: user.name")
	public void setName(String name) {
		this.name = name;
	}

	@Generated(value = "org.mybatis.generator.api.MyBatisGenerator", date = "2020-05-15T17:00:52.4797336+08:00", comments = "Source field: user.age")
	public Integer getAge() {
		return age;
	}

	@Generated(value = "org.mybatis.generator.api.MyBatisGenerator", date = "2020-05-15T17:00:52.4797336+08:00", comments = "Source field: user.age")
	public void setAge(Integer age) {
		this.age = age;
	}

}

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    第三部分：运行与测试

    一、编写Properties文件

    jdbc.properties

    jdbc.driverClass=数据库Driver
jdbc.url=数据库URL
jdbc.username=数据库Username
jdbc.password=数据库Password

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    二、编写MyBatis配置文件

    mybatis-config.xml

    





  
    
      
      
      	
        
        
        
        
      
    
  
  
  	
  


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    三、编写测试类

    AppTest.java

    package com.MybatisGeneratorDemo;

import static com.dao.UserDynamicSqlSupport.age;
import static com.dao.UserDynamicSqlSupport.id;
import static com.dao.UserDynamicSqlSupport.name;
import static com.dao.UserDynamicSqlSupport.user;
import static org.mybatis.dynamic.sql.SqlBuilder.select;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import org.mybatis.dynamic.sql.render.RenderingStrategy;
import org.mybatis.dynamic.sql.select.render.SelectStatementProvider;

import com.dao.UserMapper;
import com.entity.User;

public class AppTest {

	@Test
	public void testSelectByExample() throws IOException {
		String mybatisConfigPath = "mybatis-config.xml";
		InputStream inputStream = Resources.getResourceAsStream(mybatisConfigPath);
		SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

		try (SqlSession session = sqlSessionFactory.openSession()) {
			UserMapper mapper = session.getMapper(UserMapper.class);
			@SuppressWarnings("deprecation")
			SelectStatementProvider selectStatement = select(id, name, age).from(user).where().build()
					.render(RenderingStrategy.MYBATIS3);
			List rows = mapper.selectMany(selectStatement);
			System.out.println(rows);
		}
	}
}

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    四、运行结果

    在这里插入图片描述

    四、项目整体目录结构

    在这里插入图片描述
    MyBatis Generator官方网址

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  • 原文地址：https://blog.csdn.net/m0_67391683/article/details/126460101