官网的文档描述的支持多个数据库支持 MySQL、MariaDB、Oracle、DB2、H2、HSQL、SQLite、Postgre、SQLServer 等多种数据库。
架构
源代码地gitee mybatis-plus: mybatis 增强工具包，简化 CRUD 操作。 文档 http://baomidou.com
官网的文档：
pom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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<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>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<spring-boot.version>2.3.7.RELEASE</spring-boot.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.16</version>
</dependency>
<!-- 热部署 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
<scope>true</scope>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.4.3.4</version>
</dependency>
<!-- code生成器-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-generator</artifactId>
<version>3.4.0</version>
</dependency>
<dependency>
<groupId>org.freemarker</groupId>
<artifactId>freemarker</artifactId>
<version>2.3.30</version>
</dependency>
<!-- 模板引擎 -->
<!-- <dependency>-->
<!-- <groupId>org.apache.velocity</groupId>-->
<!-- <artifactId>velocity-engine-core</artifactId>-->
<!-- <version>2.0</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>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${spring-boot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.3.7.RELEASE</version>
<configuration>
<mainClass>com.example.demo.DemoApplication</mainClass>
</configuration>
<executions>
<execution>
<id>repackage</id>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.4.0</version>
<configuration>
<includeSystemScope>true</includeSystemScope>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<fork>true</fork><!--必须添加这个配置-->
</configuration>
</plugin>
</plugins>
</build>
</project>数据表
/*
Navicat MySQL Data Transfer
Source Server : MysqlCentos7
Source Server Version : 50731
Source Host : 192.168.0.97:3306
Source Database : test
Target Server Type : MYSQL
Target Server Version : 50731
File Encoding : 65001
Date: 2021-10-28 16:35:26
*/
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for test
-- ----------------------------
DROP TABLE IF EXISTS `test`;
CREATE TABLE `test` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`name` varchar(255) DEFAULT NULL,
`age` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of test
-- ----------------------------
INSERT INTO `test` VALUES ('1', 'z', '1');
INSERT INTO `test` VALUES ('2', 'z', '2');
INSERT INTO `test` VALUES ('3', 'z', '3');
INSERT INTO `test` VALUES ('4', 'z', '4');
INSERT INTO `test` VALUES ('5', 'z', '5');
INSERT INTO `test` VALUES ('6', 'z', '6');
INSERT INTO `test` VALUES ('7', 'z', '7');
INSERT INTO `test` VALUES ('8', 'z', '8');
INSERT INTO `test` VALUES ('9', 'z', '9');
INSERT INTO `test` VALUES ('10', 'z', '10');
INSERT INTO `test` VALUES ('11', 'z', '11');
INSERT INTO `test` VALUES ('12', 'z', '12');配置文件application.properties
# 应用名称
spring.application.name=demo
#应用服务 WEB 访问端口
server.port=8094
# 数据库驱动：
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
# 数据库连接地址
spring.datasource.url=jdbc:mysql://192.168.0.197:3306/test?serverTimezone=Asia/Shanghai&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull
# 数据库用户名&密码：
spring.datasource.username=root
spring.datasource.password=123213启动类
package com.example.demo;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.example.demo.mapper")
public class DemoApplication {
public static void main(String[] args) {
System.out.println("123大苏sss打");
SpringApplication.run(DemoApplication.class, args);
}
}新建po
package com.example.demo.po;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import java.io.Serializable;
import lombok.Data;
import lombok.EqualsAndHashCode;
@Data
@EqualsAndHashCode(callSuper = false)
public class Test implements Serializable {
private static final long serialVersionUID = 1L;
@TableId(value = "id", type = IdType.AUTO)
private Long id;
private String name;
private Integer age;
}新建Mapper
package com.example.demo.mapper;
import com.example.demo.po.Test;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
public interface TestMapper extends BaseMapper<Test> {
}新建service
package com.example.demo.service;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.example.demo.po.Test;
import com.baomidou.mybatisplus.extension.service.IService;
import com.fulong.portal.open5dServer.common.utils.PageInfo;
public interface ITestService extends IService<Test> {
IPage getProjectTableI(Integer pageNo, Integer pageSize, String name, int age);
}新建ServiceImpl
package com.example.demo.service.impl;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.example.demo.po.PTreeFolder;
import com.example.demo.po.Test;
import com.example.demo.mapper.TestMapper;
import com.example.demo.service.ITestService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.fulong.portal.open5dServer.common.utils.PageInfo;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
import java.util.Optional;
@Service
public class TestServiceImpl extends ServiceImpl<TestMapper, Test> implements ITestService {
@Resource
TestMapper testMapper;
@Override
public IPage getProjectTableI(Integer pageNo, Integer pageSize, String name, int age) {
IPage<Test> iPage = new Page<Test>(Optional.ofNullable(pageNo).orElse(0), pageSize);
IPage<Test> list = testMapper.selectPage(iPage, Wrappers.<Test>lambdaQuery()
.eq(true,Test::getName, name).eq(true,Test::getAge,age));
return list;
}
}最后在controller里调用
@PostMapping(value = "getProjectTestI")
public IPage getProjectTestI(Integer pageNo, Integer pageSize, String name, int age){
return iTestService.getProjectTableI(pageNo,pageSize,name,age);
}最后忘了添加分页配置文件
package com.example.demo;
import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
@MapperScan("com.example.demo.mapper")
public class MybatisPlusConfig {
/**
* 分页插件
* @return PaginationInterceptor
*/
// @Bean
// public PaginationInterceptor paginationInterceptor() {
// return new PaginationInterceptor();
// }
// 最新版
@Bean
public MybatisPlusInterceptor mybatisPlusInterceptor() {
MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.H2));
return interceptor;
}
}