ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Core.Data Namespace / JoinType Enumeration
Example Example

In This Topic
    JoinType Enumeration
    In This Topic
    Specifies the type of join.
    Syntax
    Members
    MemberDescription
    InnerJoin Inner join. Only matched source rows are included.
    LeftOuterJoin Left outer join. All source rows are included.
    Example
    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
                  }
                }
              }
            }
          }
        }
      });
    }
    Inheritance Hierarchy

    System.Object
       System.ValueType
          System.Enum
             ArcGIS.Core.Data.JoinType

    Requirements

    Target Platforms: Windows 11, Windows 10, Windows 8.1

    See Also