如何解决 java.math.BigInteger 无法转换为 java.lang.Integer 的问题？

Question

我的Spring-boot有问题，我的请求库是这样写的：

package com.ftm.webappli.repository.population;

import java.util.List;

import com.ftm.webappli.model.population.All;
import com.ftm.webappli.model.population.MenWomen;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.stereotype.Repository;

@Repository
public interface AllRepository extends JpaRepository<All, Long> {

    @Query(
        value = "SELECT SUM(p15_pop) AS total_population, SUM(p15_poph) AS total_hommes, SUM(p15_popf) AS total_femmes FROM public.iris_pop_2015 WHERE com = :code",
        nativeQuery = true)
    List<MenWomen> sumPopulationHommeFemme(String code);
    
}

她 return 3 BigInt on PostgreSQL。

在我写的方法中：

package com.ftm.webappli.model.population;

import java.io.Serializable;
import java.math.BigInteger;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;


import lombok.AccessLevel;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import lombok.experimental.FieldDefaults;

@Entity
@FieldDefaults(level = AccessLevel.PRIVATE)
@Getter
@NoArgsConstructor
@Setter
@Table(schema = "public", name = "iris_pop_2015")
public class MenWomen implements Serializable {
    
    @Id
    @Column(name = "total_population")
    private BigInteger nbTotal;

    @Column(name = "total_hommes")
    private BigInteger nbMen;

    @Column(name = "total_femmes")
    private BigInteger nbWomen;
 
}

但是我有一个错误:

无法将值“{5766, 2767, 2999}”的类型 [java.lang.Object[]] 转换为类型 [com.ftm.webappli.model.population.MenWomen]；嵌套异常是 org.springframework.core.convert.ConverterNotFoundException：找不到能够从类型

转换的转换器

我已尝试更正我的请求：

"SELECT SUM(p15_pop)::integer AS total_population, SUM(p15_poph)::integer AS total_hommes, SUM(p15_popf)::integer AS total_femmes FROM public.iris_pop_2015 WHERE com = :code"

模型为整数，例如：

@Column(name = "total_hommes")
private Integer nbMen;

但不起作用...该请求在 PostgreSQL 上有效，但在 Spring 上无效

我也尝试纠正我的 java.lang:

@Repository
public interface AllRepository extends JpaRepository<All, Integer>

或

@Repository
public interface AllRepository extends JpaRepository<All, Long>

或

@Repository
public interface AllRepository extends JpaRepository<All, BigInteger>

但是行不通...你有想法吗？

Answer 1

请将 All 替换为实体名称，即 MenWomen 如下所示，

@Repository
public interface AllRepository extends JpaRepository<MenWomen, Integer>

如何解决 java.math.BigInteger 无法转换为 java.lang.Integer 的问题？

How to work around java.math.BigInteger cannot be cast to java.lang.Integer?

java

postgresql

spring-mvc

maven

spring-boot