Java Fluent Mybatis聚合查询与apply方法流程的示例分析

  @Override
  public Integer getAgeMin() {
    Map<String, Object> result =
        testFluentMybatisMapper
            .findOneMap(new TestFluentMybatisQuery().select.min.age("minAge").end())
            .orElse(null);
    return result != null ? Convert.toInt(result.get("minAge"), 0) : 0;
  }

  @ApiOperation(value = "获取最小年龄", notes = "获取最小年龄")
  @RequestMapping(value = "/getAgeMin", method = RequestMethod.GET)
  @ResponseBody
  public Result<Integer> getAgeMin() {
    try {
      return Result.ok(aggregateService.getAgeMin());
    } catch (Exception exception) {
      return Result.error(ErrorCode.BASE_ERROR_CODE.getCode(), exception.getMessage(), null);
    }
  }

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
 
/** @Author huyi @Date 2021/10/26 14:15 @Description: 聚合最大年龄返回体 */
@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class AggregateMaxAgeRsp {
  private String name;
  private Integer maxAge;
}

  @Override
  public List<AggregateMaxAgeRsp> getAgeMaxByName() {
    List<Map<String, Object>> result =
        testFluentMybatisMapper.listMaps(
            new TestFluentMybatisQuery()
                .select
                .name()
                .max
                .age("maxAge")
                .end()
                .groupBy
                .name()
                .end());
    if (result != null && result.size() != 0) {
      List<AggregateMaxAgeRsp> list = new ArrayList<>();
      result.forEach(
          x -> list.add(BeanUtil.fillBeanWithMapIgnoreCase(x, new AggregateMaxAgeRsp(), false)));
      return list;
    } else {
      return null;
    }
  }

  @ApiOperation(value = "根据年龄分组并获取最大年龄", notes = "根据年龄分组并获取最大年龄")
  @RequestMapping(value = "/getAgeMaxByName", method = RequestMethod.GET)
  @ResponseBody
  public Result<List<AggregateMaxAgeRsp>> getAgeMaxByName() {
    try {
      return Result.ok(aggregateService.getAgeMaxByName());
    } catch (Exception exception) {
      return Result.error(ErrorCode.BASE_ERROR_CODE.getCode(), exception.getMessage(), null);
    }
  }

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
 
/** @Author huyi @Date 2021/10/26 14:50 @Description: 聚合平均总和返回体 */
@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class AggregateAgeSumAvgAndCountRsp {
  private String name;
  private Integer sum;
  private Integer avg;
  private Integer count;
}

  @Override
  public List<AggregateAgeSumAvgAndCountRsp> getAgeSumAvgCountByName() {
    List<Map<String, Object>> result =
        testFluentMybatisMapper.listMaps(
            new TestFluentMybatisQuery()
                .select
                .name()
                .sum
                .age("sum")
                .avg
                .age("avg")
                .count("count")
                .end()
                .groupBy
                .name()
                .end());
    if (result != null && result.size() != 0) {
      List<AggregateAgeSumAvgAndCountRsp> list = new ArrayList<>();
      result.forEach(
          x ->
              list.add(
                  BeanUtil.fillBeanWithMapIgnoreCase(
                      x, new AggregateAgeSumAvgAndCountRsp(), false)));
      return list;
    } else {
      return null;
    }
  }

  @ApiOperation(value = "根据年龄分组并获取年龄和、平均年龄、数量", notes = "根据年龄分组并获取年龄和、平均年龄、数量")
  @RequestMapping(value = "/getAgeSumAvgCountByName", method = RequestMethod.GET)
  @ResponseBody
  public Result<List<AggregateAgeSumAvgAndCountRsp>> getAgeSumAvgCountByName() {
    try {
      return Result.ok(aggregateService.getAgeSumAvgCountByName());
    } catch (Exception exception) {
      return Result.error(ErrorCode.BASE_ERROR_CODE.getCode(), exception.getMessage(), null);
    }
  }

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
 
import java.util.Date;
 
/** @Author huyi @Date 2021/10/26 15:10 @Description: 聚合应用返回体 */
@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class AggregateApplyRsp {
  private String name;
  private Date createTime;
  private Integer minAge;
  private Date maxTime;
}

  @Override
  public List<AggregateApplyRsp> getApply() {
    List<Map<String, Object>> result =
        testFluentMybatisMapper.listMaps(
            new TestFluentMybatisQuery()
                .select
                .apply("name")
                .createTime("createTime")
                .apply("min(age) as minAge", "max(create_time) as maxTime")
                .end()
                .groupBy
                .name()
                .createTime()
                .end());
    if (result != null && result.size() != 0) {
      List<AggregateApplyRsp> list = new ArrayList<>();
      result.forEach(
          x -> list.add(BeanUtil.fillBeanWithMapIgnoreCase(x, new AggregateApplyRsp(), false)));
      return list;
    } else {
      return null;
    }
  }

  @ApiOperation(value = "根据名字获取最小年龄，使用语句", notes = "根据名字获取最小年龄，使用语句")
  @RequestMapping(value = "/getApply", method = RequestMethod.GET)
  @ResponseBody
  public Result<List<AggregateApplyRsp>> getApply() {
    try {
      return Result.ok(aggregateService.getApply());
    } catch (Exception exception) {
      return Result.error(ErrorCode.BASE_ERROR_CODE.getCode(), exception.getMessage(), null);
    }
  }