DynamoDB是亚马逊AWS提供的一种NoSQL数据库服务,它具有高可扩展性、低延迟和高可靠性的特点。在DynamoDB中,可以使用FilterExpression来更新表中的数据。 FilterExpression是一种用于查询和筛选数据的表达式,它可以在更新操作中使用以过滤要更新的数据。通过指定FilterExpression,可以根据特定
DynamoDB 还支持 ACID 事务，可以确保数据一致性和完整性。DynamoDB 可以轻松地与其他 AWS 服务集成，例...
查询如下: var tableQuery = { TableName: "posts", KeyConditionExpression: "#wy = :wkYr", FilterExpression: "#ac = :isAct", IndexName: "weekYear-date-index", ScanIndexForward: false, Limit: 50, ExpressionAttributeNames: { "#wy": "weekYear", "#ac": "isActive" }, ExpressionAttribut...
If the condition expression evaluates to false, DynamoDB returns the following error message: The conditional request failed. Note For more information about attribute_not_exists and other functions, see Condition and filter expressions, operators, and functions in DynamoDB. Conditional deletes To pe...
Now suppose that you add a filter expression to the Scan. In this case, DynamoDB applies the filter expression to the six items that were returned, discarding those that do not match. The final Scan result contains six items or fewer, depending on the number of items that were filtered. ...
var params = { TableName: "User", IndexName:"a-b-index", KeyConditionExpression: "Country = :country and #s = :status", FilterExpression: "Id IN (:e)", ExpressionAttributeValues: { ":country ": "USA", ":status": 1, ":e": "1" }, ExpressionAttributeNames: {"#s": "Status"...
QueryOperationConfig config = new QueryOperationConfig( ); config.Filter = new QueryFilter( ); config.Filter.AddCondition( "year", QueryOperator.Equal, new DynamoDBEntry[ ] { 1992 } ); config.Filter.AddCondition( "title", QueryOperator.Between, new DynamoDBEntry[ ] { "B", "Hzz" } )...
conditions.notEqual(value)- Right hand side of field condition. Should follow a field declaration. conditions.lessThan(value)- Right hand side of field condition. Should follow a field declaration. conditions.lessThanOrEqual(value)- Right hand side of field condition. Should follow a field declar...
there are three items in the ticket item collection with the partition key value equal toTENANT#1|TICKET#1. We use the sort key to reduce the query results to only return items in the item where the sort key value equalsSUMMARY. This way, without using filter expressions, you onl...
SK is greater than or equal to some value SK is between two bounds (inclusively) SK begins with a sub-stringThose are all the possible constraints. They cannot be combined into more complex constraints either. This list is literally it. See Key Condition Expression.In...