batchExecute


Purpose

Enables grouping writeItem, getItems and runQuery calls to the Client Store API into a batch to be executed as a single transaction.

This method can be called no earlier than after the getOfflineStorageCount method's onSuccess callback is invoked during the first application start. Otherwise, the function fails with onFailure callback invoked.

Signature

batchExecute( onCollectQueries, onSuccess, onFailure )

Returns

This method does not return anything.

Parameters

Name Description Type Use
onCollectQueries A callback function, which allows to define queries as part of the batch parameter. It passes an object that defines functions, whose signatures match those given in the getItems, writeItem and runQuery articles. function required
onSuccess

A callback function, which passes a results object, described below.

function optional
onFailure A callback function, called if any of the queries forming the batch fails. It passes an error code, as defined in the Constants table in the Client Store article, and an error message. function optional

The onCollectQueries callback can be implemented as follows:

function(batch) {
        batch.writeItem("type of item 1", "handle of item 1", "data of item 1");
        batch.writeItem("type of item 2", "handle of item 2", "data of item 2");
        batch.getItems("type of item 3", "handle of item 3");
}

Note

The writeItem and runQuery calls cannot exist in a single batch.

As its call parameter, the onSuccess callback returns an array of objects passed to the onSuccess callback of their respective functions. For the writeItem method, the object is null, which denotes that no parameter is passed.

Related topics

Client Store
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