一、从零搭建springboot+mybatis逆向工程
1、新建项目
2、next到这里要勾选这两项
第一次有点慢，等一会儿就好
3、在pom.xml中添加mybatis-generator插件
只把图片中的复制到项目中即可
<?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 https://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>2.2.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</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>
<configuration>
<verbose>true</verbose>
<overwrite>true</overwrite>
<configurationFile>
src/main/resources/generatorConfig.xml
</configurationFile>
</configuration>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core -->
<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-core</artifactId>
<version>1.3.7</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
</project>
4、在resources创建下创建generatorConfig.xml
注意这里的generatorConfig.xml文件名和上面的对应<?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>
<context id="testTables" targetRuntime="MyBatis3">
<commentGenerator>
<!-- 是否去除自动生成的注释 true：是 ： false:否 -->
<property name="suppressAllComments" value="true" />
</commentGenerator>
<!--数据库连接的信息：驱动类、连接地址、用户名、密码 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://127.0.0.1:3306/db_boot?characterEncoding=utf8"
userId="root"
password="root">
</jdbcConnection>
<!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，为 true时把JDBC DECIMAL 和
NUMERIC 类型解析为java.math.BigDecimal -->
<javaTypeResolver>
<property name="forceBigDecimals" value="false" />
</javaTypeResolver>
<!-- targetProject:生成PO类的位置 -->
<javaModelGenerator targetPackage="com.example.pojo"
targetProject=".\src\main\java">
<!-- enableSubPackages:是否让schema作为包的后缀 -->
<property name="enableSubPackages" value="false" />
<!-- 从数据库返回的值被清理前后的空格 -->
<property name="trimStrings" value="true" />
</javaModelGenerator>
<!-- targetProject:mapper映射文件生成的位置 -->
<sqlMapGenerator targetPackage="com.example.mapper"
targetProject=".\src\main\resources">
<!-- enableSubPackages:是否让schema作为包的后缀 -->
<property name="enableSubPackages" value="false" />
</sqlMapGenerator>
<!-- targetPackage：mapper接口生成的位置 -->
<javaClientGenerator type="XMLMAPPER"
targetPackage="com.example.mapper"
targetProject=".\src\main\java">
<!-- enableSubPackages:是否让schema作为包的后缀 -->
<property name="enableSubPackages" value="false" />
</javaClientGenerator>
<!-- 指定数据库表 -->
<!-- <table schema="" tableName="tb_item" domainObjectName="Item"></table>
domainObjectName 可以配置生成的pojo名字
如不需要example类添加下面四个属性
enableCountByExample="false" enableDeleteByExample="false"
enableSelectByExample="false" enableUpdateByExample="false"></table>-->
<table schema="db_boot" tableName="t_user">
<!--去掉表结构中的前缀-->
<domainObjectRenamingRule searchString="^T" replaceString="" />
</table>
</context>
</generatorConfiguration>
5、在这之前需要现有数据库和表
6、使用maven的mybatis-generator插件
如果右边找到不到maven可以
7、双击
8、验证
成功生成
二、一个简单的接口
上面逆向工程已经生成，接下来简单是使用。1、在application.properties中添加基本配置
#配置端口号
server.port=8080
#数据源
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/db_boot?characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
#配置.xml文件路径
mybatis.mapper-locations=classpath:com.example.mapper/*.xml
#配置模型路径
mybatis.type-aliases-package=com.example.pojo
#开启debug
debug=true
#com.mycompany.mavenspringboot.controller 日志 WARN级别输出
logging.level.com.mycompany.mavenspringboot.controller=WARN
#com.mycompany.mavenspringboot.mapper sql日志 DEBUG级别输出
logging.level.com.gaohan.stzb.dao=DEBUG
#logging.file=./logs/logging.log
logging.pattern.console=%d{yyyy/MM/dd-HH:mm:ss} [%thread] %-5level %logger- %msg%n
logging.pattern.file=%d{yyyy/MM/dd-HH:mm} [%thread] %-5level %logger- %msg%n
2、在pom中引入MySQL驱动和druid数据源
<!--mysql驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!--druid数据源-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
3、创建service层接口
package com.example.service;
import com.example.pojo.User;
public interface UserService {
User selectByPrimaryKey(Integer id);
}4、创建service实现类
package com.example.service.impl;
import com.example.mapper.UserMapper;
import com.example.pojo.User;
import com.example.service.UserService;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
@Service("userService")
public class UserServiceImpl implements UserService {
@Resource
private UserMapper userMapper;
@Override
public User selectByPrimaryKey(Integer id) {
return userMapper.selectByPrimaryKey(id);
}
}
注意：要在UserMaper中加上@Mapper注解，不然无法正确的注入
5、创建Controller层
package com.example.controller;
import com.example.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("index")
public String index(){
return userService.selectByPrimaryKey(1).toString();
}
}6、启动DemoApplication
这里有个坑（自己挖的坑自己也跳进去了，哭辽），springboot的启动类必须提高他的目录结构，也就是启动类所在的目录要包含所有的类
7、浏览器验证
为了方便看到效果，为user类添加tostring方法
成功
原文地址：https://www.cnblogs.com/shaoyu/p/12150691.html
时间： 2024-08-11 06:07:23