/// <summary>
/// Queries a database for information, composing the query with information provided in the
/// specified query structure. This query uses a single request and as such cannot be used
/// with large data sets.
/// </summary>
/// <param name="databaseId">
/// The unique identifier of the EMS database to query.
/// </param>
/// <param name="query">
/// The information used to construct a query for which results are returned.
/// </param>
/// <param name="callback">
/// A callback to execute for each row of data received.
/// </param>
/// <param name="emsSystem">
/// The unique identifier of the system containing the EMS data.
/// </param>
public virtual Task SimpleQueryAsync(string databaseId, DatabaseQuery query, RowCallback callback, int emsSystem = NoEmsServerSpecified)
{
int ems = GetEmsSystemForMethodCall(emsSystem);
return(CallApiTask(api => api.QueryDatabase(ems, databaseId, query.Raw)).ContinueWith(task =>
{
// Callback for each row.
DbQueryResult queryResult = task.Result;
var result = new DatabaseQueryResult(queryResult.Header);
result.CallbackRows(query, queryResult.Rows, callback);
}));
}
/// <summary>
/// Queries the database for information, composing the query with information provided in the
/// specified query structure. This method is a convenience wrapper around the async-query routes
/// to handle pagination, and it also executes a callback function for each row of data.
/// </summary>
/// <param name="databaseId">
/// The unique identifier of the EMS database to query.
/// </param>
/// <param name="query">
/// The information used to construct a query for which results are returned.
/// </param>
/// <param name="callback">
/// A callback to execute for each row of data received.
/// </param>
/// <param name="rowsPerCall">
/// The number of rows to read for each API call.
/// </param>
/// <param name="emsSystem">
/// The unique identifier of the system containing the EMS data.
/// </param>
public virtual async Task QueryAsync(string databaseId, DatabaseQuery query, RowCallback callback, int rowsPerCall = 20000, int emsSystem = NoEmsServerSpecified)
{
AsyncQueryInfo info = await StartQueryAsync(databaseId, query, emsSystem);
var result = new DatabaseQueryResult(info.Header);
int startingRow = 0;
bool moreToRead = true;
while (moreToRead)
{
AsyncQueryData data = await ReadQueryAsync(databaseId, info.Id, startingRow, startingRow + rowsPerCall - 1, emsSystem);
result.CallbackRows(query, data.Rows, callback);
startingRow = startingRow + rowsPerCall;
moreToRead = data.HasMoreRows;
}
await StopQueryAsync(databaseId, info.Id, emsSystem);
}