Question

ExchangeValue exchangeValue = repository.findByFromAndTo(from, to);

尽管h2 db中存在数据，但exchangeValue仍为空

H2 data snapshot

我的代码网址是https://github.com/sunny107842/currency-exchange

package com.sunny.microservices.currencyexchangeservice;

import org.springframework.data.jpa.repository.JpaRepository;

public interface ExchangeValueRepository extends 
    JpaRepository<ExchangeValue, Long>{


ExchangeValue findByFromAndTo(String from, String to);
}

编辑完整代码可以在github url

上找到

交换类

`

package com.sunny.microservices.currencyexchangeservice;

import java.math.BigDecimal;

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

@Entity
public class ExchangeValue {

@Id
private Long id;

@Column(name = "currency_from")
private String from;

@Column(name = "currency_to")
private String to;

private BigDecimal conversionMultiple;
private int port;

public ExchangeValue() {

}

public ExchangeValue(Long id, String from, String to, BigDecimal conversionMultiple) {
    super();
    this.id = id;
    this.from = from;
    this.to = to;
    this.conversionMultiple = conversionMultiple;
}

public Long getId() {
    return id;
}

public String getFrom() {
    return from;
}

public String getTo() {
    return to;
}

public BigDecimal getConversionMultiple() {
    return conversionMultiple;
}

public int getPort() {
    return port;
}

public void setPort(int port) {
    this.port = port;
}

}

有人可以帮我吗？数据存在于数据库中

我正在打这个电话以获取数据

http://localhost:8001/currency-exchange/from/usd/to/inr

请让我知道是否需要其他数据。

Answer 1

这很简单。在data.sql中，您使用大写字母插入了值。尝试使用http://localhost:8001/currency-exchange/from/USD/to/INR或在data.sql中将其更改为小写。

Answer 2

Hi Issue在其余呼叫中。这是区分大小写的错误

正确的呼叫应该是

http://localhost:8001/currency-exchange/from/USD/to/INR

代替

 http://localhost:8001/currency-exchange/from/usd/to/inr

Answer 3

这是区分大小写的问题： 将usd更改为USD，将ind更改为INR

致电

GET:    http://localhost:8001/currency-exchange/from/USD/to/INR

即使H2 db中存在数据，JPA存储库方法也不返回数据

3 个答案: