Load Data (Production Mapping)
Summary
Moves features from one schema to another by loading data from a source to a target workspace. Data mapping rules described in a cross-reference database are applied during the load. The Esri Mapping and Charting solutions products all install a cross-reference database that you can use, or you can create one using the Create Cross-reference tool.
Data that matches the schema defined in the cross-reference database for the source is appended to the target workspace. The cross-reference database contains a DatasetMapping table that lists pairs of source and target dataset names. Each source and target name pair can have a WHERE clause and a subtype. The WHERE clause defines a subset of features in the source to append to the target. Subtype identifies a subtype in the target feature class into which features are loaded.
Usage
The cross-reference database has other tables that affect load data functionality. These tables enable the following operations:
- Map fields between data sources.
- Override values from source to target.
- Specify different source and target schema owners for enterprise geodatabases.
See Related Topics below for a complete list of tables in the cross-reference database and the functionality they enable.
Use the Dataset Mapping Definitions parameter to specify which feature classes, shapefiles, or coverages to load from the input source to the target workspace. The list of sources and targets comes from the DatasetMapping table in the cross-reference database.
You can only set WHERE clauses and subtypes in the DatasetMapping table in the cross-reference database. You cannot set these in the Dataset Mapping Definitions parameter.
The Id value used in the Dataset Mapping Definitions parameter must refer to an existing row id in the DatasetMapping table in the cross-reference database. The row in the DatasetMapping table contains the name of the source and target datasets.
This tool returns warning Source dataset [dataset name] not found or is inaccessible for each source feature class listed in the cross-reference database but not found in the input sources workspace.
This tool returns warning Target dataset [dataset name] not found or is inaccessible for each target feature class listed in the cross-reference database but not found in the target workspace.
Syntax
| Parameter | Explanation | Data Type |
in_cross_reference |
The path to a cross-reference database. Cross-reference databases for each product specification can be found in the Program Files\ArcGIS\Esri[SolutionName]\Desktop10.1\[ProductName]\[SpecificationName]\DataConversion directory. | Workspace |
in_sources [in_sources,...] |
A list of workspaces that contain the source features to load into the target workspace. | Workspace |
in_target |
The target workspace that contains the schema referenced in the cross-reference database. Source features are loaded into this workspace. | Workspace |
in_dataset_map_defs [in_dataset_map_defs,...] (Optional) |
The source to target feature class mapping list. The format of this string is id | SourceDataset | TargetDataset | WhereClause | Subtype. | String |
row_level_errors (Optional) |
Indicates if the tool will log errors that occur while inserting new rows into feature classes and tables in in_target.
| Boolean |
Code Sample
The following Python window script demonstrates how to use the LoadData tool.
# Name: LoadData_Example.py
# Description: Executes the LoadData_production function using a single feature class in the source and target workspaces
# Requirements: Production Mapping extension
# path to the cross reference database
cross_ref_db = "C:/Program Files/ESRIDefenseMapping/Desktop10.1/Mgcp/DataConversion/MGCP_general_TRD30_GDB_to_MGCP_general_TRD30_GDB.mdb"
# the dataset mapping string
dataset_mapping = '10 | RoadL | RoadL | | 0'
# source and target workspaces
source_workspace = "C:/gisdata/Export_MGCP_TRD3.gdb"
target_workspace = "C:/gisdata/mgcp_export.gdb"
# exec the tool
arcpy.LoadData_production(cross_ref_db,source_workspace,target_workspace,dataset_mapping)
The following stand-alone script demonstrates how to use the LoadData tool with three feature classes.
# Name: LoadData_standalone_Example.py
# Description: Executes the LoadData_production function with multiple feature classes in the source and target workspaces
# Requirements: Production Mapping extension
import arcpy
# check out the extension
arcpy.CheckOutExtension("foundation")
# path to the cross reference database
cross_ref_db = "C:/Program Files (x86)/ESRIDefenseMapping/Desktop10.1/Mgcp/DataConversion/MGCP_general_TRD30_GDB_to_MGCP_general_TRD30_GDB.mdb"
# the dataset mapping string
dataset_mapping = "10 | RoadL | RoadL | | 0;34 | BuildP | BuildP | | 0;39 | CoastA | CoastA | | 0"
# source and target workspaces
source_workspace = r'C:\gisdata\Export_MGCP_TRD3.gdb'
target_workspace = r'c:\gisdata\mgcp_export.gdb'
# truncate the target feature classes
arcpy.env.workspace = target_workspace + "/features/"
arcpy.DeleteFeatures_management('RoadL')
arcpy.DeleteFeatures_management('CoastA')
arcpy.DeleteFeatures_management('BuildP')
# exec the tool
arcpy.LoadData_production(cross_ref_db,source_workspace,target_workspace,dataset_mapping)
# check feature count after running the tool
arcpy.GetCount_management('RoadL')
print 'RoadL ' + arcpy.GetMessage(2)
arcpy.GetCount_management('CoastA')
print 'CoastA ' + arcpy.GetMessage(2)
arcpy.GetCount_management('BuildP')
print 'BuildP ' + arcpy.GetMessage(2)
# check the extension back in
arcpy.CheckInExtension("foundation")