使用Mybatis generator可以自动生成mapper、model类以及mapper.xml,可以满足基本的crud功能。
目录结构:
使用:
1、导入依赖 以及maven插件
<!--集成druid连接池-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<!-- MyBatis 生成器 -->
<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-core</artifactId>
<version>1.3.7</version>
</dependency>
<!--Mysql数据库驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.15</version>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.4</version>
</dependency>
maven插件:
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</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>8.0.15</version>
</dependency>
</dependencies>
<configuration>
<!--配置文件的位置-->
<configurationFile>src/main/resources/generatorConfig.xml</configurationFile>
<verbose>true</verbose>
<overwrite>true</overwrite>
</configuration>
<executions>
<execution>
<id>Generate MyBatis Artifacts</id>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
2、编写generatorConfig.xml配置文件
<?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="generator.properties"/>
<context id="MySqlContext" targetRuntime="MyBatis3" defaultModelType="flat">
<!-- 配置签指分隔符的属性-->
<property name="beginningDelimiter" value="`"/>
<!-- 配置后置分隔符的属性-->
<property name="endingDelimiter" value="`"/>
<!-- 设置要使用的Java文件的编码-->
<property name="javaFileEncoding" value="UTF-8"/>
<!-- 为模型生成序列化方法-->
<plugin type="org.mybatis.generator.plugins.SerializablePlugin"/>
<!-- 为生成的Java模型创建一个toString方法 -->
<plugin type="org.mybatis.generator.plugins.ToStringPlugin"/>
<!--生成mapper.xml时覆盖原文件-->
<plugin type="org.mybatis.generator.plugins.UnmergeableXmlMappersPlugin" />
<!--可以自定义生成model的代码注释-->
<!-- <commentGenerator type="com.macro.mall.tiny.mbg.CommentGenerator">-->
<commentGenerator>
<!-- 是否去除自动生成的注释 true:是 : false:否 -->
<property name="suppressAllComments" value="false"/>
<property name="suppressDate" value="false"/>
<property name="addRemarkComments" value="false"/>
</commentGenerator>
<!--配置数据库连接-->
<jdbcConnection driverClass="${jdbc.driverClass}"
connectionURL="${jdbc.connectionURL}"
userId="${jdbc.userId}"
password="${jdbc.password}">
<!--解决mysql驱动升级到8.0后不生成指定数据库代码的问题-->
<property name="nullCatalogMeansCurrent" value="true" />
</jdbcConnection>
<!--指定生成model的路径-->
<javaModelGenerator targetPackage="com.zr.mall.demo.mbg.model" targetProject="src\main\java"/>
<!--指定生成mapper.xml的路径-->
<sqlMapGenerator targetPackage="com.zr.mall.demo.mbg.mapper" targetProject="src\main\resources"/>
<!--指定生成mapper接口的的路径-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.zr.mall.demo.mbg.mapper"
targetProject="src\main\java"/>
<!--生成全部表tableName设为%-->
<table tableName="user">
<generatedKey column="id" sqlStatement="MySql" identity="true"/>
</table>
</context>
</generatorConfiguration>
3、编写generator.properties 里边放上边需要读取的数据库连接信息
jdbc.driverClass=com.mysql.cj.jdbc.Driver
jdbc.connectionURL=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
jdbc.userId=root
jdbc.password=123456
4、创建文件夹
配置文件中指定了生成model、mapper、mapper.xml的路径,所以要创建好文件夹
5、配置maven插件
(1)、点击运行
(2)、配置插件
名称:generator
命令行:
mybatis-generator:generate -e
(3)、应用
6、配置数据库驱动
编辑application.yml
server:
port: 8081 #spring 启动端口
spring:
datasource:
url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC #mysql 地址
username: root
password: 123456
driver-class-name: com.mysql.jdbc.Driver #指定驱动
mybatis:
mapper-locations: classpath:mapper/*xml #mapper扫描路径
type-aliases-package: com.example.demo.bean #类型所在目录
configuration:
map-underscore-to-camel-case: true #开启驼峰字段转换
7、使用generator
选择上generator 点击右侧运行
8、运行成功,查看结果
全部自动生成
9、测试使用
编写Service层
UserService:
package com.zr.mall.demo.service;
import com.zr.mall.demo.mbg.model.User;
public interface UserService {
User getUser(Long id);
}
UserServiceImpl:
package com.zr.mall.demo.service.impl;
import com.zr.mall.demo.mbg.mapper.UserMapper;
import com.zr.mall.demo.mbg.model.User;
import com.zr.mall.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class UserServiceImpl implements UserService {
@Autowired
UserMapper userMapper;
@Override
public User getUser(Long id) {
return userMapper.selectByPrimaryKey(id);
}
}
controller:
调用: