public static List <MetadataRecord> Query(string host, int port, int timeout = -1)
{
List <MetadataRecord> measurements = new List <MetadataRecord>();
// Note that openHistorian internal publisher controls how many tables / fields to send as meta-data to subscribers (user controllable),
// as a result, not all fields in associated database views will be available. Below are the default SELECT filters the publisher
// will apply to the "MeasurementDetail", "DeviceDetail" and "PhasorDetail" database views:
// SELECT NodeID, UniqueID, OriginalSource, IsConcentrator, Acronym, Name, AccessID, ParentAcronym, ProtocolName, FramesPerSecond, CompanyAcronym, VendorAcronym, VendorDeviceName, Longitude, Latitude, InterconnectionName, ContactList, Enabled, UpdatedOn FROM DeviceDetail WHERE IsConcentrator = 0
// SELECT DeviceAcronym, ID, SignalID, PointTag, SignalReference, SignalAcronym, PhasorSourceIndex, Description, Internal, Enabled, UpdatedOn FROM MeasurementDetail
// SELECT DeviceAcronym, Label, Type, Phase, SourceIndex, UpdatedOn FROM PhasorDetail
// SELECT VersionNumber FROM SchemaVersion
DataTable measurementTable = null;
string connectionString = $"server={host}:{port}; interface=0.0.0.0";
Metadata = MetadataRetriever.GetMetadata(connectionString, timeout);
// Reference needed meta-data tables
measurementTable = Metadata.Tables["MeasurementDetail"];
if ((object)measurementTable != null)
{
// Do something with measurement records
foreach (DataRow measurement in measurementTable.Rows)
{
measurements.Add(new MetadataRecord(measurement));
}
}
return(measurements);
}
/// <summary>
/// Gets meta-data from the <paramref name="connectionString" /> waiting no longer than the specified <paramref name="timeout"/>.
/// </summary>
/// <param name="connectionString">GEP publication host and port, e.g., "192.168.1.1:6175", to connect to for meta-data.</param>
/// <param name="timeout">Specifies how long to wait, in milliseconds, for meta-data.</param>
/// <returns>The meta-data received from the GEP publisher in <see cref="DataSet"/> format.</returns>
public static DataSet GetMetadata(string connectionString, int timeout = Timeout.Infinite)
{
using (MetadataRetriever retriever = new MetadataRetriever(connectionString))
return(retriever.GetMetadata(timeout));
}