#Razorsql dynamodb update#
Unlike GSIs, you cannot update or delete them after table creation.Generally speaking, you should rather avoid LSIs for two reasons: This is useful if you need to be able to fetch a collection of items sorted based on more than one attribute, e.g. In LSIs, the partition key must remain the same as the primary key's partition key. It works similar to the GSI but with one difference. DynamoDB Local Secondary Index (LSI)Īnother variation of secondary key is the Local Secondary Index. When a mutation is made against the table, any of the global secondary indexes on that table are updated asynchronously in an eventually consistent manner. In the background, DynamoDB keeps each of the GSIs automatically in sync with the base table. With GSIs, you can use GetItem and query operations using non-primary key attributes. If you index that attribute using Global Secondary Index, you don't have to use scan operation.
DynamoDB Global Secondary Index (GSI)īut what if you want to fetch an item without knowing its key, you only know other attribute, let's say authorId of the Book. Thanks to that (and GSIs + LSIs, more on that later), our Key-Value store becomes much more sophisticated because it allows for more complex query access patterns. Choosing this option allows items to share the same partition/hash key, but the combination of hash key and sort key must be unique.Īs a consequence, you can now use Query, which allows to fetch a collection of items with the same partition key. DynamoDB Composite KeyĪnother option is to use a composite key, which is composed of partition key, also known as hash key, and sort key, also known as range key. You lose the ability to perform a Query, to fetch data from a table with such key, you can use Scan or GetItem operation. With simple key, DynamoDB essentially works just like a Key-Value store. Each record needs to have one of these, and it needs to be unique. In DynamoDB there are two types of primary keys: Different DynamoDB Key TypesĭynamoDB simple key consists only of one value - the partition/hash key. If you want to access an item in the DynamoDB table fast (with O(1) complexity), you'll need to know its key. com/amazonaws/services/dynamodbv2/model/ UpdateItemRequest.java:/* 3130 */ sb.append(“Expected: “).append(getExpected()).append(“,”) ġ.在如下调用栈中对于标记有 mapper 的 internalExpectedValueAssertions 这个 map 里。Īt 2.datamodeling.StandardBeanProperties$MethodReflect.get(StandardBeanProperties.java:124) at 2.datamodeling.StandardBeanProperties$MethodReflect.get(StandardBeanProperties.java:124) at 2.(DynamoDBMapperFieldModel.java:102) at 2.datamodeling.DynamoDBMapper$SaveObjectHandler.onVersionAttribute(DynamoDBMapper.java:924) at 2.datamodeling.DynamoDBMapper$SaveObjectHandler.execute(DynamoDBMapper.java:708) at 2.(DynamoDBMapper.java:623) at 2.(AbstractDynamoDBMapper.java:123)Īt 2.(UpdateItemRequest.java:782) at 2.(UpdateItemRequest.java:782) at 2.(UpdateItemRequest.java:801) at 2.datamodeling.DynamoDBMapper$SaveObjectHandler.doUpdateItem(DynamoDBMapper.java:849) at 2.datamodeling.DynamoDBMapper$2.executeLowLevelRequest(DynamoDBMapper.java:594) at 2.datamodeling.DynamoDBMapper$SaveObjectHandler.execute(DynamoDBMapper.java:733) at 2.(DynamoDBMapper.java:623) at 2.(AbstractDynamoDBMapper.Keys, like in many other NoSQL and SQL databases, act as a unique identifier of a record or item. com/amazonaws/services/dynamodbv2/model/ PutItemRequest.java:/* 2071 */ sb.append(“Expected: “).append(getExpected()).append(“,”)
com/amazonaws/services/dynamodbv2/model/ DeleteItemRequest.java:/* 1986 */ sb.append(“Expected: “).append(getExpected()).append(“,”)
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