mp分页查询

在实际开发过程中，分页显示功能是非常常见的

这里使用Mybatis Plus进行分页查询

首先需要加入分页插件

MyBatisPlusConfig

import com.baomidou.mybatisplus.core.injector.ISqlInjector;
import com.baomidou.mybatisplus.extension.injector.LogicSqlInjector;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.plugins.PerformanceInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Profile;

@Configuration
@MapperScan("com.atguigu.eduService.mapper")
public class MyBatisPlusConfig {

    /**
     * SQL 执行性能分析插件
     * 开发环境使用，线上不推荐。 maxTime 指的是 sql 最大执行时长
     */
    @Bean
    @Profile({"dev","test"})// 设置 dev test 环境开启
    public PerformanceInterceptor performanceInterceptor() {
        PerformanceInterceptor performanceInterceptor = new PerformanceInterceptor();
        performanceInterceptor.setMaxTime(1000);//ms，超过此处设置的ms则sql不执行
        performanceInterceptor.setFormat(true);
        return performanceInterceptor;
    }

    /**
     * 分页插件
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }

}

然后在Controller层编写

@ApiOperation(value = "分页讲师列表")
    @GetMapping("/pageList/{page}/{limit}")
    public Result pageList(
            @ApiParam(name = "page",value = "当前页码",required = true) @PathVariable Long page,
            @ApiParam(name = "limit",value = "每页记录数",required = true) @PathVariable Long limit){
        Page<EduTeacher> pageParam = new Page<>(page,limit);
        eduTeacherService.page(pageParam,null);

        long total = pageParam.getTotal();  //总记录数
        List<EduTeacher> list = pageParam.getRecords();

        return Result.succ().data("total",total).data("list",list);
    }

这里，Result是自定义的统一返回结果集

import io.swagger.annotations.ApiModelProperty;
import lombok.Data;

import java.util.HashMap;
import java.util.Map;

@Data
public class Result {

    @ApiModelProperty(value = "是否成功")
    private Boolean success;

    @ApiModelProperty(value = "返回码")
    private Integer code;

    @ApiModelProperty(value = "返回消息")
    private String message;

    @ApiModelProperty(value = "返回数据")
    private Map<String, Object> data = new HashMap<String, Object>();

    private Result(){}

    public static Result succ(){
        Result result = new Result();
        result.setSuccess(true);
        result.setCode(ResultCode.SUCCESS);
        result.setMessage("成功");
        return result;
    }
    public static Result error(){
        Result result = new Result();
        result.setSuccess(false);
        result.setCode(ResultCode.ERROR);
        result.setMessage("失败");
        return result;
    }
    public Result success(Boolean success){
        this.setSuccess(success);
        return this;
    }
    public Result message(String message){
        this.setMessage(message);
        return this;
    }
    public Result code(Integer code){
        this.setCode(code);
        return this;
    }
    public Result data(String key, Object value){
        this.data.put(key, value);
        return this;
    }
    public Result data(Map<String, Object> map){
        this.setData(map);
        return this;
    }
}

 

 

 

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