PutAttributes Parameters in Java

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PutAttributes Parameters
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As the primary write operation in SimpleDB, PutAttributes has a longer list of available parameters than the previously shown operationsThe full list of possible request parameters is as follows:
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DomainName (required) The name of the domain where the attribute(s) will be storedThis parameter must be the name of a domain that has already been created ItemName (required) The unique key with which the attributes will be associatedThis can be a new ItemName for the purposes of an insert or an existing ItemName for the purposes of an updateThe maximum length of this parameter is 1,024 bytes AttributeName (required) The name of the attribute, similar to a column name, passed as a list in combination with an AttributeValue and optionally a Replace flagThe minimum length is 1 and the maximum length of this parameter is 1,024 bytes AttributeValue (required) The value to be stored, passed as a list in combination with an AttributeName and optionally a Replace flagThis value must be present, but it can have zero length (the empty string)The maximum length of this parameter is 1,024 bytes
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PutAttributes
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ExpectedName (optional) The attribute name to check for a conditional write This parameter is only valid when either an ExpectedValue or an ExpectedExists is also includedThe maximum length of this parameter is 1,024 bytes ExpectedValue (optional) The value to check for a conditional writeThis value must exist in SimpleDB in order for the conditional write to succeedThis parameter is only valid when an ExpectedName is also includedThe maximum length of this parameter is 1,024 bytes ExpectedExists (optional) The flag to check for existence in a conditional writeWhen set to true, write only succeeds when the ExpectedName existsWhen false, write only succeeds when the ExpectedName does not existThis parameter is only valid when an ExpectedName is also includedThe maximum length of this parameter is 1,024 bytes Replace (optional) The flag that specifies whether to replace the existing attribute value, passed as a list in combination with an AttributeName and an AttributeValue If Replace is true, SimpleDB removes all of the existing attribute values If Replace is false, SimpleDB adds the new value to any existing values If this parameter is not given, a default value of false is used If there is no existing attribute, the Replace flag has no effect
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ItemName
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and conditionals as individual parameters the other hand, are grouped together and specified once for each attribute you are sending in the PutAttributes call The maximum number of attributes that you can store in an item is 256You can pass any number of them in a single call, up to the 256 limit, but it is wise to pass the fewest number of attributes possible for reasons of box usage charges In cases where PutAttributes is used to update an existing item, this is easily accomplished by passing only the changed values Even in cases where PutAttributes is used to insert new data, you may want to split the attributes into multiple calls to this operation if there are more than 52 attributes 11, Improving the SimpleDB Client, provides an in-depth analysis into the surprising pricing issues surrounding PutAttributes
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AttributeName, AttributeValue, and Replace, on
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The operation takes DomainName,
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You can set the replace flag to true on any PutAttributes call, even if the item doesn t exist yet or the item doesn t have the attribute you are passing It won t result in an error, but it also doesn t provide any benefit A single PutAttributes call can accept hundreds of attributes Because the replace flag is set at the individual attribute level, you can mix replace attributes with non-replace attributes in the same call Of course, as always, all the attributes in a single call will apply to a single item
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The fact that PutAttributes accepts a variable amount of data presents a challenge to SimpleDB client developers It is not a challenge because it is difficult to implement, the challenging part is trying to provide a high level of usability for many different use cases Decisions have to be made about how attribute data is structured within the program
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