Sys.Data.DataService.query Method

Reads data from a data service.

Syntax

query: function(query, succeededCallback, failedCallback, userContext)

Usage

var a = exampleDataService.query(query, succeededCallback, failedCallback, userContext);

Return Value

The Sys.Net.WebRequest object that performed the query operation.

Remarks

Use the query method to retrieve data from a data service. If you do not provide a value for the query parameter, the top-level collection is retrieved. The query method immediately executes a single query operation.

The signatures for the callback functions should be similar to the following code:

function callbackSucceeded(result, context, operation)
function callbackFailed(error, context, operation)

The functions you assign to the callback functions must accept three parameters. The first parameter contains the result (or error) returned by the data service. The second parameter contains the state object for the data operation. The third parameter contains a description of the operation that was performed. For query operations, the third parameter contains the string that defined the query.

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