Edits an existing item's attributes.
You can perform a conditional update (insert a new attribute name-value pair if it doesn't exist, or replace an existing name-value pair if it has certain expected attribute values).
Declaration Syntax| C# |
UpdateItemResponse UpdateItem( UpdateItemRequest updateItemRequest )
Parameters- updateItemRequest (UpdateItemRequest)
- Container for the necessary parameters to execute the UpdateItem service method on AmazonDynamoDB.
Return ValueThe response from the UpdateItem service method, as returned by AmazonDynamoDB.
ExamplesThis example shows how to update an item in a table.
CopyUpdateItem sample// Create a client AmazonDynamoDBClient client = new AmazonDynamoDBClient(); // Define item key // Hash-key of the target item is string value "Mark Twain" // Range-key of the target item is string value "The Adventures of Tom Sawyer" Key key = new Key { HashKeyElement = new AttributeValue { S = "Mark Twain" }, RangeKeyElement = new AttributeValue { S = "The Adventures of Tom Sawyer" } }; // Define attribute updates Dictionary<string, AttributeValueUpdate> updates = new Dictionary<string, AttributeValueUpdate>(); // Update item's Setting attribute updates["Setting"] = new AttributeValueUpdate() .WithAction("PUT") .WithValue(new AttributeValue { S = "St. Petersburg, Missouri" }); // Remove item's Bibliography attribute updates["Bibliography"] = new AttributeValueUpdate() .WithAction("DELETE"); // Add a new string to the item's Genres SS attribute updates["Genres"] = new AttributeValueUpdate() .WithAction("ADD") .WithValue(new AttributeValue { SS = new List<string> { "Bildungsroman" } }); // Create UpdateItem request UpdateItemRequest request = new UpdateItemRequest { TableName = "SampleTable", Key = key, AttributeUpdates = updates }; // Issue request client.UpdateItem(request);
Exceptions