Gets the
Table representing the join. This provides access to perform operations like
Search
and
Select
on the joined data. This method must be called on the MCT. Use QueuedTask.Run.
Joining a file geodatabase feature class to an Oracle database query layer feature class with a virtual relationship class
public async Task JoiningFileGeodatabaseFeatureClassToOracleQueryLayer()
{
await ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
using (Geodatabase geodatabase = new Geodatabase(new FileGeodatabaseConnectionPath(new Uri("C:\\Data\\LocalGovernment.gdb"))))
using (Database database = new Database(new DatabaseConnectionProperties(EnterpriseDatabaseType.Oracle)
{
AuthenticationMode = AuthenticationMode.DBMS,
Instance = "instance",
User = "user",
Password = "password",
Database = "database"
}))
using (FeatureClass leftFeatureClass = geodatabase.OpenDataset<FeatureClass>("Hospital"))
using (Table rightTable = database.OpenTable(database.GetQueryDescription("FacilitySite")))
{
Field originPrimaryKey = leftFeatureClass.GetDefinition().GetFields().FirstOrDefault(field => field.Name.Equals("facilityId"));
Field destinationForeignKey = rightTable.GetDefinition().GetFields().FirstOrDefault(field => field.Name.Equals("hospitalID"));
VirtualRelationshipClassDescription description = new VirtualRelationshipClassDescription(
originPrimaryKey, destinationForeignKey, RelationshipCardinality.OneToOne);
using (RelationshipClass relationshipClass = leftFeatureClass.RelateTo(rightTable, description))
{
JoinDescription joinDescription = new JoinDescription(relationshipClass)
{
JoinDirection = JoinDirection.Forward,
JoinType = JoinType.LeftOuterJoin
};
Join join = new Join(joinDescription);
using (Table joinedTable = join.GetJoinedTable())
{
// Perform operation on joined table.
}
}
}
});
}
Joining a file geodatabase feature class to an Oracle database query layer feature class with a virtual relationship class
public async Task JoiningFileGeodatabaseFeatureClassToOracleQueryLayer()
{
await ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
using (Geodatabase geodatabase = new Geodatabase(new FileGeodatabaseConnectionPath(new Uri("C:\\Data\\LocalGovernment.gdb"))))
using (Database database = new Database(new DatabaseConnectionProperties(EnterpriseDatabaseType.Oracle)
{
AuthenticationMode = AuthenticationMode.DBMS,
Instance = "instance",
User = "user",
Password = "password",
Database = "database"
}))
using (FeatureClass leftFeatureClass = geodatabase.OpenDataset<FeatureClass>("Hospital"))
using (Table rightTable = database.OpenTable(database.GetQueryDescription("FacilitySite")))
{
Field originPrimaryKey = leftFeatureClass.GetDefinition().GetFields().FirstOrDefault(field => field.Name.Equals("facilityId"));
Field destinationForeignKey = rightTable.GetDefinition().GetFields().FirstOrDefault(field => field.Name.Equals("hospitalID"));
VirtualRelationshipClassDescription description = new VirtualRelationshipClassDescription(
originPrimaryKey, destinationForeignKey, RelationshipCardinality.OneToOne);
using (RelationshipClass relationshipClass = leftFeatureClass.RelateTo(rightTable, description))
{
JoinDescription joinDescription = new JoinDescription(relationshipClass)
{
JoinDirection = JoinDirection.Forward,
JoinType = JoinType.LeftOuterJoin
};
Join join = new Join(joinDescription);
using (Table joinedTable = join.GetJoinedTable())
{
// Perform operation on joined table.
}
}
}
});
}
Joining two tables from different geodatabases
public async Task JoinTablesFromDifferentGeodatabases()
{
await ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
using (Geodatabase sourceGeodatabase = new Geodatabase(new FileGeodatabaseConnectionPath(new Uri("Path \\ to \\Geodatabase \\ one"))))
using (Geodatabase destinationGeodatabase = new Geodatabase(new FileGeodatabaseConnectionPath(new Uri("Path \\ to \\Geodatabase \\ two"))))
using (Table sourceTable = sourceGeodatabase.OpenDataset<Table>("State"))
using (Table destinationTable = destinationGeodatabase.OpenDataset<Table>("Cities"))
{
Field primaryKeyField = sourceTable.GetDefinition().GetFields().FirstOrDefault(field => field.Name.Equals("State.State_Abbreviation"));
Field foreignKeyField = destinationTable.GetDefinition().GetFields().FirstOrDefault(field => field.Name.Equals("Cities.State"));
VirtualRelationshipClassDescription virtualRelationshipClassDescription = new VirtualRelationshipClassDescription(primaryKeyField, foreignKeyField, RelationshipCardinality.OneToMany);
using (RelationshipClass relationshipClass = sourceTable.RelateTo(destinationTable, virtualRelationshipClassDescription))
{
JoinDescription joinDescription = new JoinDescription(relationshipClass)
{
JoinDirection = JoinDirection.Forward,
JoinType = JoinType.InnerJoin,
TargetFields = sourceTable.GetDefinition().GetFields()
};
using (Join join = new Join(joinDescription))
{
Table joinedTable = join.GetJoinedTable();
//Process the joined table. For example ..
using (RowCursor cursor = joinedTable.Search())
{
while (cursor.MoveNext())
{
using (Row row = cursor.Current)
{
// Use Row
}
}
}
}
}
}
});
}
Target Platforms: Windows 11, Windows 10
ArcGIS Pro version: 3 or higher.