BatchPutAttributes in Java

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BatchPutAttributes
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Replace (optional) The flag that specifies whether to replace existing attribute values or merely add a new attribute valueThis parameter is passed as a list in combination with an AttributeName and an AttributeValue If this parameter is not given, a default value of false is used
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Your SimpleDB client will expose a specific interface for passing data in a batchThis usually involves either a collection of objects, each representing an item, or a map object, where each ItemName maps to a collection of attributes In addition to the limits on specific parameters to this operation, there is a 1MB limit on the total request size Tip
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To get the best performance from BatchPutAttributes, there are two criteria that must be met The items must not yet exist and no replace flag should be passed Items meeting these conditions appear to be processed by a faster algorithm than other items
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BatchPutAttributes Response Data
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No operation-specific data comes back from BatchPutAttributes when the call is successful However, there are quite a few potential errors:
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InvalidParameterValue Returned when the 1,024-byte size limit is exceeded by either the ItemName, the AttributeName, or the AttributeValue DuplicateItemName Returned when two or more of the items have the same ItemName MissingParameter Returned when any of the four required parameters to this operation are omitted However, your SimpleDB client will require you to pass these values, so this is an error code you are unlikely to encounter in practice NoSuchDomain Returned when the domain name in the request did not exist at that endpoint NumberDomainBytesExceeded Returned when the 10GB per domain limit has been reached NumberDomainAttributesExceeded Returned when the 1 billion attributes per domain limit has been reached NumberSubmittedItemsExceeded Returned when you try to pass more than 25 items in a single request NumberSubmittedAttributesExceeded Returned when you try to pass more than 256 attributes for an item in a single request TooLargeRequest Returned when the size of your request is greater than 1MB NumberItemAttributesExceeded Returned when any items in the batch already have 256 attributes stored in SimpleDBThis error can occur even if you are reducing the number of attributes in the item by means of the replace flag
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3 A Code-Snippet Tour of the SimpleDB API
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The error message that accompanies this error code includes the offending ItemName(s) Of all the possible errors, only the last one cannot be prevented on the client side before the request goes outAny error that occurs will cause the whole batch to be rejected and none of the items will be stored Note
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All the items that you include with a BatchPutAttributes request will be accepted or rejected as a unit However, the updated items will not be immediately visible from calls to GetAttributes or Select The time it takes for updates to become visible to normal reads is subject to eventual consistency, while consistent reads are capable of returning the new data immediately in most cases Moreover, although the individual attributes in an item will be updated atomically, some items may be updated before others Therefore, you cannot use BatchPutAttributes to guarantee transaction semantics, or consistency between items
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BatchPutAttributes Snippet in Java
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Following is Java code to put multiple items at once:
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SimpleDB simpleDB = new SimpleDB(accessKeyID, secretAccessKey); // a collection to map item name to attributes Map<String, List<ItemAttribute>> items; items = new HashMap<String, List<ItemAttribute>>(); itemsput("Cigar001", itemsput("Cigar002", itemsput("Cigar003", itemsput("Cigar004", buildRomeoCigar("No 2", "90")); buildRomeoCigar("Toro", "89")); buildRomeoCigar("Churchill", "94")); buildRomeoCigar("Robusto", "81"));
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try { Domain domain = simpleDBgetDomain("products"); domainbatchPutAttributes(items); Systemoutprintln("batch put succeeded"); } catch (SDBException e) { AWSError error = egetErrors()get(0); String code = errorgetCode(); String message = errorgetMessage(); Systemerrprintf("batch put failed: %s: %s", code, message); } private List<ItemAttribute> buildRomeoCigar(String make,String rating) { boolean replace = false; ItemAttribute[] attributes = new ItemAttribute[] { new ItemAttribute("ProductType", "Cigar", replace),
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