springboot+mybatis使用RowBounds实现分页

最新推荐文章于 2024-01-19 14:54:40 发布

原创最新推荐文章于 2024-01-19 14:54:40 发布 · 643 阅读

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#spring boot

本文展示了如何在Spring Boot项目中集成MyBatis和PageHelper实现分页查询，包括pom.xml配置相关依赖，UserMapper接口及XML配置，以及UserController和服务层的代码实现。

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一、目录结构

其中config中的SwaggerConfig可以帮助测试，有没有均可。

二、pom.xml文件导入相关依赖，userMapping配置与数据库相关代码

pom.xml：

<?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>2.5.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>spring-mybatis-page</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-mybatis-page</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-jdbc</artifactId>
        </dependency>
        <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>2.2.0</version>
        </dependency>

        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>2.0.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.2</version>
        </dependency>
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>swagger-bootstrap-ui</artifactId>
            <version>1.9.2</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.9.2</version>
        </dependency>
    </dependencies>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

userMapping：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC
        "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.springmybatispage.mapper.UserMapper">
    <resultMap id="BaseResultMap" type="com.example.springmybatispage.entity.User">
        <result column="id" jdbcType="INTEGER" property="id"/>
        <result column="userName" jdbcType="VARCHAR" property="username"/>
        <result column="passWord" jdbcType="VARCHAR" property="password"/>
    </resultMap>

    <select id="findByRowBounds" resultType="com.example.springmybatispage.entity.User" >
        select  id,userName,passWord from users
    </select>
    
</mapper>

三、具体代码

UserController:

package com.example.springmybatispage.controller;

import com.example.springmybatispage.entity.Page;
import com.example.springmybatispage.entity.User;
import com.example.springmybatispage.service.UserService;
import org.apache.ibatis.session.RowBounds;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
public class UserController {
      @Autowired
      UserService userService;
      @RequestMapping(value = "home",method = RequestMethod.POST)
      public List<User> findByRowBounds(@RequestBody Page page){

            return userService.findByRowBounds(page.getPageIndex(), page.getPageSize());
      }
}j

UserService:

package com.example.springmybatispage.service;

import com.example.springmybatispage.entity.User;
import com.example.springmybatispage.mapper.UserMapper;
import org.apache.ibatis.session.RowBounds;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserService {
    @Autowired
    UserMapper userMapper;

    public List<User> findByRowBounds(int pageIndex, int pageSize){
        final RowBounds rowBounds = new RowBounds((pageIndex) * pageSize, pageSize);
        return userMapper.findByRowBounds(rowBounds);
    }


}

UserMapper:

package com.example.springmybatispage.mapper;

import com.example.springmybatispage.entity.User;
import org.apache.ibatis.session.RowBounds;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository
public interface UserMapper {
        List<User> findByRowBounds(RowBounds rb);
}

Page:

package com.example.springmybatispage.entity;

public class Page {
    private int pageIndex;
    private int pageSize;

    public int getPageIndex() {
        return pageIndex;
    }

    public void setPageIndex(int pageIndex) {
        this.pageIndex = pageIndex;
    }

    public int getPageSize() {
        return pageSize;
    }

    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    @Override
    public String toString() {
        return "Page{" +
                "pageIndex=" + pageIndex +
                ", pageSize=" + pageSize +
                '}';
    }
}

User:

package com.example.springmybatispage.entity;

public class Page {
    private int pageIndex;
    private int pageSize;

    public int getPageIndex() {
        return pageIndex;
    }

    public void setPageIndex(int pageIndex) {
        this.pageIndex = pageIndex;
    }

    public int getPageSize() {
        return pageSize;
    }

    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    @Override
    public String toString() {
        return "Page{" +
                "pageIndex=" + pageIndex +
                ", pageSize=" + pageSize +
                '}';
    }
}

启动类：

package com.example.springmybatispage;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.example.springmybatispage")
public class SpringMybatisPageApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringMybatisPageApplication.class, args);
    }

}