使用AWS在Dynamo DB中搜索

Question

I want to search in Dynamo DB on multiple columns without using partition key.

I am trying to implement the use case as we have in mysql like we can search over any column with a column type value. But, as i got to know that the same use case can't satisfied by Dynamo DB.

IS there any way to achieve this in Dynamo DB.

Any help would be appreciated!

Answer 1

如果使用DynamoDB Stream和将表更新写入AWS ElasticSearch集群的AWS Lambda函数索引表的内容，则可以支持任意搜索。

Answer 2

As Per Example Given In AWS Document of Local Search Indexes - PHP Low Level API ,

Valid comparisons for the sort key condition are as follows:

• sortKeyName = :sortkeyval - true if the sort key value is equal to :sortkeyval.
• sortKeyName < :sortkeyval - true if the sort key value is less than :sortkeyval.
• sortKeyName <= :sortkeyval - true if the sort key value is less than or equal to :sortkeyval.
• sortKeyName > :sortkeyval - true if the sort key value is greater than :sortkeyval.
• sortKeyName >= :sortkeyval - true if the sort key value is greater than or equal to :sortkeyval.
• sortKeyName BETWEEN :sortkeyval1 AND :sortkeyval2 - true if the sort key value is greater than or equal to :sortkeyval1, and less than or equal to :sortkeyval2.
• begins_with ( sortKeyName, :sortkeyval ) - true if the sort key value begins with a particular operand. (You cannot use this function with a sort key that is of type Number.)

Note that the function name begins_with is case-sensitive.

So, only AND supported for ranges. There is no OR . Also you could try using begins_with .

Your Scenario Can be converted to following Code :

$tableName = "genericTable";
$response = $dynamodb->query([
    'TableName' => $tableName,
    'IndexName' => 'OrderCreationDateIndex',
    'KeyConditionExpression' => 'hashkey = :h_key and columnName = :value',
    'ExpressionAttributeValues' =>  [
        ':h_key' => ['S' => 'foo'],
        ':value' => ['S' => 'bar']
    ],
    'Select' => 'ALL_PROJECTED_ATTRIBUTES',
    'ScanIndexForward' => false,
    'ConsistentRead' => true,
    'Limit' => 5,
    'ReturnConsumedCapacity' => 'TOTAL'
]);