Java 是否可以更改DynamoDB表中范围键的值?
我知道这可能是一个非常愚蠢的问题,但我对DynamoDB是新手 我怀疑是否有可能在DynamoDB中更新范围键的值 假设我的表是“TEST” 我想修改Java 是否可以更改DynamoDB表中范围键的值?,java,amazon-dynamodb,Java,Amazon Dynamodb,我知道这可能是一个非常愚蠢的问题,但我对DynamoDB是新手 我怀疑是否有可能在DynamoDB中更新范围键的值 假设我的表是“TEST” 我想修改Date属性 表中的初始值为: { ID = "344" Date = "5656" Name = "ABC" } 运行下面的代码。我可以更改名为GSI的属性 Map<String,AttributeValue> item = new HashMap<String,AttributeValue>(); item.put("
Date
属性
表中的初始值为:
{
ID = "344"
Date = "5656"
Name = "ABC"
}
运行下面的代码。我可以更改名为GSI的属性
Map<String,AttributeValue> item = new HashMap<String,AttributeValue>();
item.put("ID", new AttributeValue("344"));
item.put("Date", new AttributeValue("5656"));
Map<String,AttributeValueUpdate> item1 = new HashMap<String,AttributeValueUpdate>();
AttributeValueUpdate update = new AttributeValueUpdate().withValue(new AttributeValue("AMIT")).withAction("PUT");
item1.put("Name", update);
UpdateItemRequest updateItemreq = new UpdateItemRequest("Test",item,item1);
UpdateItemResult updateItemres = dynamoDBUSEast.updateItem(updateItemreq);
与
我得到了一些错误,因为
Exception in thread "main" com.amazonaws.AmazonServiceException: One or more parameter values were invalid: Cannot update attribute Date. This attribute is part of the key (Service: AmazonDynamoDBv2; Status Code: 400; Error Code: ValidationException; Request ID: HRRP24Q7C48AMD8ASAI992L6MBVV4KQNSO5AEMVJF66Q9ASUAAJG)
at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:820)
at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:439)
at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:245)
at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.invoke(AmazonDynamoDBClient.java:2908)
at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.updateItem(AmazonDynamoDBClient.java:1256)
那么有可能更改范围键值吗?它有点隐藏,但在文档中它说:
“您可以使用UpdateItem更新任何非键属性。”
因此,当前更新项目主键的唯一方法是删除旧项目并写入新项目。否,与异常消息状态一样,无法更新属性日期。此属性是键的一部分
您还可以在以下目录下看到这一点:
要修改的属性名称,对每个属性执行的操作,
以及每个的新值。如果要更新的属性是
该表上任何索引的索引键属性
类型必须与AttributesDefinition中定义的索引键类型匹配
表中的说明您可以使用UpdateItem来更新任何非密钥
属性。
文档中指出,您可以更新“该表上任何索引的索引键属性”的任何属性,这意味着当您更新投影到索引上的属性时,即使它是该索引键的一部分,该索引也将更新以反映原始项目。来自
不能使用UpdateItem更新任何主键属性。
相反,您需要删除该项,然后使用PutItem
创建具有新属性的新项
下面是我在.net中更新id的实现,方法是删除该项,然后使用新id重新创建它。我假设java非常类似:
// Based on https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/LowLevelDotNetItemsExample.html
public class UpdateId
{
private static string tableName = "MyTableName";
private static AmazonDynamoDBClient client = new AmazonDynamoDBClient();
private static bool isVerbose = false;
public static void ChangeId(string currentId, string newId)
{
try
{
var deletedItem = DeleteItem(currentId);
if (deletedItem.Count == 0)
{
Console.WriteLine($"ERROR: Item to delete not found: {currentId}");
return;
}
deletedItem["Id"] = new AttributeValue
{
S = newId
};
CreateItem(deletedItem);
var updatedItem = RetrieveItem(newId);
if (updatedItem.Count > 0 && updatedItem["Id"].S == newId)
{
Console.WriteLine($"Item id successfully changed from ({currentId}) to ({newId})");
}
else
{
Console.WriteLine($"ERROR: Item id didn't change from ({currentId}) to ({newId})");
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
Console.WriteLine("To continue, press Enter");
Console.ReadLine();
}
}
private static void CreateItem(Dictionary<string, AttributeValue> item)
{
var request = new PutItemRequest
{
TableName = tableName,
Item = item
};
client.PutItem(request);
}
private static Dictionary<string, AttributeValue> RetrieveItem(string id)
{
var request = new GetItemRequest
{
TableName = tableName,
Key = new Dictionary<string, AttributeValue>()
{
{ "Id", new AttributeValue {
S = id
} }
},
ConsistentRead = true
};
var response = client.GetItem(request);
// Check the response.
var attributeList = response.Item; // attribute list in the response.
if (isVerbose)
{
Console.WriteLine("\nPrinting item after retrieving it ............");
PrintItem(attributeList);
}
return attributeList;
}
private static Dictionary<string, AttributeValue> DeleteItem(string id)
{
var request = new DeleteItemRequest
{
TableName = tableName,
Key = new Dictionary<string, AttributeValue>()
{
{ "Id", new AttributeValue {
S = id
} }
},
// Return the entire item as it appeared before the update.
ReturnValues = "ALL_OLD",
// ExpressionAttributeNames = new Dictionary<string, string>()
// {
// {"#IP", "InPublication"}
// },
// ExpressionAttributeValues = new Dictionary<string, AttributeValue>()
// {
// {":inpub",new AttributeValue {
// BOOL = false
// }}
// },
// ConditionExpression = "#IP = :inpub"
};
var response = client.DeleteItem(request);
// Check the response.
var attributeList = response.Attributes; // Attribute list in the response.
// Print item.
if (isVerbose)
{
Console.WriteLine("\nPrinting item that was just deleted ............");
PrintItem(attributeList);
}
return attributeList;
}
private static void PrintItem(Dictionary<string, AttributeValue> attributeList)
{
foreach (KeyValuePair<string, AttributeValue> kvp in attributeList)
{
string attributeName = kvp.Key;
AttributeValue value = kvp.Value;
Console.WriteLine(
attributeName + " " +
(value.S == null ? "" : "S=[" + value.S + "]") +
(value.N == null ? "" : "N=[" + value.N + "]") +
(value.SS == null ? "" : "SS=[" + string.Join(",", value.SS.ToArray()) + "]") +
(value.NS == null ? "" : "NS=[" + string.Join(",", value.NS.ToArray()) + "]")
);
}
Console.WriteLine("************************************************");
}
}
它的唯一键不能更改
item1.put("Date", update);
Exception in thread "main" com.amazonaws.AmazonServiceException: One or more parameter values were invalid: Cannot update attribute Date. This attribute is part of the key (Service: AmazonDynamoDBv2; Status Code: 400; Error Code: ValidationException; Request ID: HRRP24Q7C48AMD8ASAI992L6MBVV4KQNSO5AEMVJF66Q9ASUAAJG)
at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:820)
at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:439)
at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:245)
at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.invoke(AmazonDynamoDBClient.java:2908)
at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.updateItem(AmazonDynamoDBClient.java:1256)
// Based on https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/LowLevelDotNetItemsExample.html
public class UpdateId
{
private static string tableName = "MyTableName";
private static AmazonDynamoDBClient client = new AmazonDynamoDBClient();
private static bool isVerbose = false;
public static void ChangeId(string currentId, string newId)
{
try
{
var deletedItem = DeleteItem(currentId);
if (deletedItem.Count == 0)
{
Console.WriteLine($"ERROR: Item to delete not found: {currentId}");
return;
}
deletedItem["Id"] = new AttributeValue
{
S = newId
};
CreateItem(deletedItem);
var updatedItem = RetrieveItem(newId);
if (updatedItem.Count > 0 && updatedItem["Id"].S == newId)
{
Console.WriteLine($"Item id successfully changed from ({currentId}) to ({newId})");
}
else
{
Console.WriteLine($"ERROR: Item id didn't change from ({currentId}) to ({newId})");
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
Console.WriteLine("To continue, press Enter");
Console.ReadLine();
}
}
private static void CreateItem(Dictionary<string, AttributeValue> item)
{
var request = new PutItemRequest
{
TableName = tableName,
Item = item
};
client.PutItem(request);
}
private static Dictionary<string, AttributeValue> RetrieveItem(string id)
{
var request = new GetItemRequest
{
TableName = tableName,
Key = new Dictionary<string, AttributeValue>()
{
{ "Id", new AttributeValue {
S = id
} }
},
ConsistentRead = true
};
var response = client.GetItem(request);
// Check the response.
var attributeList = response.Item; // attribute list in the response.
if (isVerbose)
{
Console.WriteLine("\nPrinting item after retrieving it ............");
PrintItem(attributeList);
}
return attributeList;
}
private static Dictionary<string, AttributeValue> DeleteItem(string id)
{
var request = new DeleteItemRequest
{
TableName = tableName,
Key = new Dictionary<string, AttributeValue>()
{
{ "Id", new AttributeValue {
S = id
} }
},
// Return the entire item as it appeared before the update.
ReturnValues = "ALL_OLD",
// ExpressionAttributeNames = new Dictionary<string, string>()
// {
// {"#IP", "InPublication"}
// },
// ExpressionAttributeValues = new Dictionary<string, AttributeValue>()
// {
// {":inpub",new AttributeValue {
// BOOL = false
// }}
// },
// ConditionExpression = "#IP = :inpub"
};
var response = client.DeleteItem(request);
// Check the response.
var attributeList = response.Attributes; // Attribute list in the response.
// Print item.
if (isVerbose)
{
Console.WriteLine("\nPrinting item that was just deleted ............");
PrintItem(attributeList);
}
return attributeList;
}
private static void PrintItem(Dictionary<string, AttributeValue> attributeList)
{
foreach (KeyValuePair<string, AttributeValue> kvp in attributeList)
{
string attributeName = kvp.Key;
AttributeValue value = kvp.Value;
Console.WriteLine(
attributeName + " " +
(value.S == null ? "" : "S=[" + value.S + "]") +
(value.N == null ? "" : "N=[" + value.N + "]") +
(value.SS == null ? "" : "SS=[" + string.Join(",", value.SS.ToArray()) + "]") +
(value.NS == null ? "" : "NS=[" + string.Join(",", value.NS.ToArray()) + "]")
);
}
Console.WriteLine("************************************************");
}
}
UpdateId.ChangeId("OriginalId", "NewId");