oracle+mybatis-plus+springboot实现分页查询的实例

今天蠢了一上午才弄出这玩意，话不多说上代码！

1、建一个配置类

package com.sie.demo.config;

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.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @author liaozhifeng
 * @date 2021/7/31 11:14
 * @Version 1.0
 */
@Configuration
@ConditionalOnClass(value = {PaginationInterceptor.class})
public class MybatisPlusConfig {

    // 最新版
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
//        数据库的配置DbType.ORACLE 根据自己的数据库选择
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.ORACLE));
        return interceptor;
    }
}

2、service层的代码

package com.sie.demo.service.impl;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.sie.demo.entity.Users;
import com.sie.demo.entity.vo.PageUserVo;
import com.sie.demo.mapper.UserMapper;
import com.sie.demo.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.annotation.Resource;

import javax.servlet.http.HttpSession;
import java.util.List;

/**
 * @author liaozhifeng
 * @date 2021/7/27 14:03
 * @Version 1.0
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, Users> implements UserService {
    @Resource
    UserMapper userMapper;

    /**
     * 分页查询用户
     * @param currentPage
     * @param pageSize
     * @return
     */
    @Override
    public PageUserVo selectAll(long currentPage, long pageSize) {
        IPage<Users> userPage = new Page<>(currentPage, pageSize);//参数一是当前页，参数二是每页个数
        IPage<Users> iPage = userMapper.selectPage(userPage, null);
        List<Users> list = iPage.getRecords();
        Long total = iPage.getTotal();
        PageUserVo pageUserVo = new PageUserVo(list, total);
        return pageUserVo;
    }
}

3、controller层 RetResult是我自己定义的一个统一返回的泛型对象

package com.sie.demo.controller;
import com.baomidou.mybatisplus.core.conditions.Wrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.conditions.query.QueryChainWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.sie.demo.entity.RetCode;
import com.sie.demo.entity.RetResponse;
import com.sie.demo.entity.RetResult;
import com.sie.demo.entity.Users;

import com.sie.demo.entity.vo.PageUserVo;
import com.sie.demo.service.impl.UserServiceImpl;
import com.sie.demo.util.TokenUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.util.List;

@Controller
@RestController
@RequestMapping("user")
@Slf4j
public class UserController {
    @Autowired
    UserServiceImpl userService;

    /**
     *
     *
     * @param currentPage
     * @param pageSize
     * @return
     */
    @GetMapping("selectAll")
    public RetResult<PageUserVo> selectAll(long currentPage,  long pageSize) {
        log.info(currentPage+pageSize+"=========================");
        PageUserVo pageUserVo  = userService.selectAll(currentPage,pageSize);
        return RetResponse.makeOKRsp(pageUserVo);
    }
}

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