JAVA DynamoDB:不支持;需要@DynamoDBTyped或@DynamoDBTypeConverted
我已经创建了CRUD方法,但是我有一些问题 这是我的添加方法代码:JAVA DynamoDB:不支持;需要@DynamoDBTyped或@DynamoDBTypeConverted,java,amazon-web-services,amazon-dynamodb,aws-lambda,Java,Amazon Web Services,Amazon Dynamodb,Aws Lambda,我已经创建了CRUD方法,但是我有一些问题 这是我的添加方法代码: public Product addProduct(Product content) { Product item = new Product(); item.setName(content.getName()); item.setCalories(content.getCalories()); item.setFat(content.getFat()); item.setCarbo(c
public Product addProduct(Product content) {
Product item = new Product();
item.setName(content.getName());
item.setCalories(content.getCalories());
item.setFat(content.getFat());
item.setCarbo(content.getCarbo());
item.setProtein(content.getProtein());
item.setProductKinds(content.getProductKinds());
item.setAuthor(content.getAuthor());
item.setMedia(content.getMedia());
item.setApproved(content.getApproved());
databaseController.saveTest(item);
logger.log("Item created");
return item;
}
这是我的editProduct方法:
public Product editProduct(Product product) {
Product databaseProduct = databaseController.get(Product.class, product.getId());
databaseProduct.setAllProducts(product);
databaseController.save(databaseProduct);
return databaseProduct;
}
在模特课上,我认为我把一切都做好了:
package pl.javamill.model.kitchen;
import com.amazonaws.services.dynamodbv2.datamodeling.*;
import pl.javamill.model.Request;
import pl.javamill.model.common.Author;
import pl.javamill.model.common.AuthorConverter;
import pl.javamill.model.common.Media;
import pl.javamill.model.common.MediaConverter;
import java.util.List;
@DynamoDBTable(tableName = "product")
public class Product extends Request {
/**
* Id of kitchen content
*/
private String id;
/**
* Name of product
*/
private String name;
/**
* Calories in 100g
*/
private Integer calories;
/**
* Fat in 100g
*/
private Double fat;
/**
* Total carbo in 100g
*/
private Double carbo;
/**
* Total Protein in 100g
*/
private Double protein;
/**
* Labels of product for example gluten fee product
*/
private List<ProductKind> productKinds;
/**
* Author of content.
*/
private Author author;
/**
* Address of content image.
*/
private Media media;
private Boolean approved;
@DynamoDBHashKey(attributeName = "id")
@DynamoDBAutoGeneratedKey
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
@DynamoDBAttribute(attributeName = "Name")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@DynamoDBAttribute(attributeName = "Calories")
public Integer getCalories() {
return calories;
}
public void setCalories(Integer calories) {
this.calories = calories;
}
@DynamoDBAttribute(attributeName = "Fat")
public Double getFat() {
return fat;
}
public void setFat(Double fat) {
this.fat = fat;
}
@DynamoDBAttribute(attributeName = "Carbo")
public Double getCarbo() {
return carbo;
}
public void setCarbo(Double carbo) {
this.carbo = carbo;
}
@DynamoDBAttribute(attributeName = "Protein")
public Double getProtein() {
return protein;
}
public void setProtein(Double protein) {
this.protein = protein;
}
@DynamoDBTypeConvertedEnum
@DynamoDBTypeConverted(converter = ProductKindConverter.class)
@DynamoDBAttribute(attributeName = "ProductKinds")
public List<ProductKind> getProductKinds() {
return productKinds;
}
public void setProductKinds(List<ProductKind> productKinds) {
this.productKinds = productKinds;
}
@DynamoDBTypeConverted(converter = AuthorConverter.class)
@DynamoDBAttribute(attributeName = "Author")
public Author getAuthor() {
return author;
}
public void setAuthor(Author author) {
this.author = author;
}
@DynamoDBTypeConverted(converter = MediaConverter.class)
@DynamoDBAttribute(attributeName = "Media")
public Media getMedia() {
return media;
}
public void setMedia(Media media) {
this.media = media;
}
@DynamoDBAttribute(attributeName = "Approved")
public Boolean getApproved() {
return approved;
}
public void setApproved(Boolean approved) {
this.approved = approved;
}
public void setAllProducts(Product product) {
if (!getName().equals(product.getName())) {
setName(product.getName());
}
if (!getCalories().equals(product.getCalories())) {
setCalories(product.getCalories());
}
if (!getFat().equals(product.getFat())) {
setFat(product.getFat());
}
if (!getCarbo().equals(product.getCarbo())) {
setCarbo(product.getCarbo());
}
if (!getProtein().equals(product.getProtein())) {
setProtein(product.getProtein());
}
if (!getProductKinds().equals(product.getProductKinds())) {
setProductKinds(product.getProductKinds());
}
if (!getAuthor().equals(product.getAuthor())) {
setAuthor(product.getAuthor());
}
if (!getMedia().equals(product.getMedia())) {
setMedia(product.getMedia());
}
if (!getApproved().equals(product.getApproved())) {
setApproved(product.getApproved());
}
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Product product = (Product) o;
if (name != null ? !name.equals(product.name) : product.name != null) return false;
if (calories != null ? !calories.equals(product.calories) : product.calories != null) return false;
if (fat != null ? !fat.equals(product.fat) : product.fat != null) return false;
if (carbo != null ? !carbo.equals(product.carbo) : product.carbo != null) return false;
if (protein != null ? !protein.equals(product.protein) : product.protein != null) return false;
if (productKinds != null ? !productKinds.equals(product.productKinds) : product.productKinds != null)
return false;
if (author != null ? !author.equals(product.author) : product.author != null) return false;
if (media != null ? !media.equals(product.media) : product.media != null) return false;
return approved != null ? approved.equals(product.approved) : product.approved == null;
}
@Override
public int hashCode() {
int result = id != null ? id.hashCode() : 0;
result = 31 * result + (name != null ? name.hashCode() : 0);
result = 31 * result + (calories != null ? calories.hashCode() : 0);
result = 31 * result + (fat != null ? fat.hashCode() : 0);
result = 31 * result + (carbo != null ? carbo.hashCode() : 0);
result = 31 * result + (protein != null ? protein.hashCode() : 0);
result = 31 * result + (productKinds != null ? productKinds.hashCode() : 0);
result = 31 * result + (author != null ? author.hashCode() : 0);
result = 31 * result + (media != null ? media.hashCode() : 0);
result = 31 * result + (approved != null ? approved.hashCode() : 0);
return result;
}
}
从DB方法获取产品:
public Product getTest(String id) {
AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard()
.withRegion(regions).build();
mapper = new DynamoDBMapper(client);
Product retrivedProduct = mapper.load(Product.class, id);
return retrivedProduct;
}
单元测试通过了,一切似乎都正常,但当我使用POSTMAN进行测试时,出现了一些错误。我以json的形式发送产品,看起来是这样的:
{"id":null,"name":"yoloornotyolo","calories":1000,"fat":400.0,"carbo":20.0,"protein":40.0,"productKinds":["MEAT"],"author":{"name":"Plejer Annołn","id":"testID2"},"media":{"name":"heheszki","url":"http://blabla.pl","mediaType":"IMAGE"},"approved":false}
然后我得到了“消息”:“内部服务器错误”,所以我检查了日志文件,我可以看到:
不支持;需要@DynamoDBTyped或@DynamoDBTypeConverted:
com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMappingException
我不知道怎么了。有人能解释一下我该怎么做吗?看看您的saveProduct方法会很有用。您正在使用DynamoDBMapper注释,但看起来您试图保存的是一个项目对象,而不是一个产品对象。而不是
Item item = new Item()
使用
我要提到的一件事是,您可以使用
在模型类中,执行以下操作:
@DynamoDBHashKey(attributeName = "Id")
@DynamoDBAutoGeneratedKey
public String getId() { return id; }
public void setId(String id) { this.id = id; }
然后,您不需要在addProduct方法中处理id
编辑:您的saveProduct方法应该遵循
DynamoDBMapper mapper = new DynamoDBMapper(dynamoDBClient);
mapper.save(item)
我怀疑您是否需要传递表名,因为这是产品对象上的注释。你不应该使用putItem
编辑:
saveProduct方法应采用产品对象,而不是项对象。不要使用putItem,因为它不知道您的模型类。使用DynamoDBMapper保存功能。您不需要指定表名,因为它是产品类上的注释(该表称为“Product”)。您应该使用AmazonDynamoDB与DynamoDB进行接口。下面返回的方法无效,因此需要更新addProduct方法
public void saveProduct(Product item) {
logger.log("Starting to save an item");
//You need a new method to return an AmazonDynamoDB interface
AmazonDynamoDB dynamoDB = getAmazonDynamoDB();
DynamoDBMapper mapper = new DynamoDBMapper(dynamoDB);
mapper.save(item)
logger.log("Item stored");
return saved;
}
编辑:
您可以像这样构建AmazonDynamoDB接口
// Set to your chosen region
AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard()
.withRegion(Regions.US_WEST_2)
.build();
编辑:
DynamoDBMapper仅支持特定的
这里有三种复杂的数据类型;产品种类、作者和媒体。如果要将这些存储在数据库中,则需要为每一个都编写一个。convertor类通常定义如何将对象转换为字符串并再次转换
编辑:您的集合ProductKind需要一个如下所示的转换器。只需将“MyObject”更改为ProductKinds。为异常设置堆栈跟踪将非常有用。在中间消息中,它包含无法转换的数据类型和字段信息
通常不需要进行任何转换,只需确保所有自定义类上都有@DynamoDBDocument,使用的所有自定义枚举上都有@DynamoDBTypeConvertedEnum。我这样做了,但没有做任何更改:(更新了答案。我认为问题在于您没有构建产品对象。好的,谢谢,这就是问题所在-我更改了saveProduct方法,现在存储了项,但现在出现了另一个错误:“ReturnValue只能是ALL_OLD或NONE(服务:AmazonDynamoDBv2;状态代码:400;错误代码:ValidationException;我认为这可能是您的saveProduct方法中的一个问题。您可以发布它吗?当您保存一个对象时,您可以选择设置返回值One,但这没有帮助,仍然是一样的:“返回值只能是全部旧的或没有”
DynamoDBMapper mapper = new DynamoDBMapper(dynamoDBClient);
mapper.save(item)
public void saveProduct(Product item) {
logger.log("Starting to save an item");
//You need a new method to return an AmazonDynamoDB interface
AmazonDynamoDB dynamoDB = getAmazonDynamoDB();
DynamoDBMapper mapper = new DynamoDBMapper(dynamoDB);
mapper.save(item)
logger.log("Item stored");
return saved;
}
// Set to your chosen region
AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard()
.withRegion(Regions.US_WEST_2)
.build();