Make Query Layer (Data Management)

Summary

Creates a query layer from a DBMS table based on an input SQL select statement.

Usage

• Query layers will only work with enterprise databases. File geodatabases are not a valid input workspace for this tool.

• The layer that is created by the tool is temporary and will not persist after the session ends unless the project is saved or the data is persisted by making a copy using Copy Rows or Copy Features.

• If the result of the SQL query entered returns a spatial column, the output will be a feature layer. If the SQL query does not return a spatial column, the output will be a stand-alone table.

• The connection files necessary for this tool can be created using the Create Database Connection tool.

• If the result of the SQL query does not return any rows, the output query layer will be empty, only containing the schema of the columns returned by the query. In this case, if the columns returned contain a spatial column, the tool will use the following defaults to create the query layer:

  • Geometry type—POINT
  • SRID—1
  • Spatial Reference—NAD1983

  Then you need to determine whether any of these values should be changed before executing the tool.

• For geographic data, each record in the result returned from the SQL statement should have an associated spatial reference identifier (SRID). The SRID value is used by the database to determine the spatial reference for the data. The specific functional differences for the SRID will vary between each DBMS platform. Some DBMS platforms support multiple SRID values within the same table; ArcGIS only supports one value. This tool allows you to choose the SRID value or it will default to the SRID from the first record in the result set.

Parameters

Dialog

Label	Explanation	Data Type
Input Database Connection	The database connection file that contains the data to be queried.	Workspace
Output Layer Name	The output name of the feature layer or table view to be created.	String
Query	The SQL statement that defines the select query to be run in the database. Note: This string must pass validation before remaining controls will be enabled. Validation will be triggered when you click outside this input box. The validation process runs the query in the database and verifies whether the result of the SQL query meets the data modeling standards enforced by ArcGIS. If the validation fails, the tool will return a warning. The only exception is for ModelBuilder, in which case validation will not be triggered if the input is derived data. Rules for validation are as follows: The result of the SQL query must have only one spatial field. The result of the SQL query must have only one spatial reference. The result of the SQL query must have only one entity type, such as point, multipoint, line, or polygon. The result of the SQL query cannot have any field types not supported by ArcGIS; ArcGIS field data types describes the field types supported in ArcGIS. Validation is especially important when working with data in spatial databases that do not enforce the same standards as ArcGIS.	String
Unique Identifier Field(s) (Optional)	One or more fields from the SELECT statement SELECT list that will generate a dynamic, unique row identifier.	String
Shape Type (Optional)	Specifies the shape type of the query layer. Only those records from the result set of the query that match the specified shape type will be used in the output query layer. Tool validation will attempt to set this property based on the first record in the result set. This can be changed before executing the tool if it is not the desired output shape type. This parameter is ignored if the result set of the query does not return a geometry field. Point—The output query layer will use point geometry. Multipoint—The output query layer will use multipoint geometry. Polygon—The output query layer will use polygon geometry. Polyline—The output query layer will use polyline geometry.	String
SRID (Optional)	The spatial reference identifier (SRID) value for queries that return geometry. Only those records from the result set of the query that match the specified SRID value will be used in the output query layer. Tool validation will attempt to set this property based on the first record in the result set. This can be changed before executing the tool if it is not the desired output SRID value. This parameter is ignored if the result set of the query does not return a geometry field.	String
Coordinate System (Optional)	The coordinate system that will be used by the output query layer. Tool validation will attempt to set this property based on the first record in the result set. This can be changed before executing the tool if it is not the desired output coordinate system. This parameter is ignored if the result set of the query does not return a geometry field.	Spatial Reference
Define the spatial properties of the layer (Optional)	Specifies how the spatial properties for the layer will be defined. During the validation process, dimensionality, geometry type, spatial reference, SRID, and unique identifier properties will be set on the query layer. These values are based on the first row returned in the query. To manually define these properties instead of the tool querying the table to get them, the Define spatial properties for the layer parameter is checked by default. Checked—Manually define the spatial properties of the layer. This is the default. Unchecked—Layer properties will be determined based on the first row returned in the query.	Boolean
Coordinates include M values (Optional)	Specifies whether the layer will have m-values. Checked—The layer will have m-values. Unchecked—The layer will not have m-values. This is the default.	Boolean
Coordinates include Z values (Optional)	Specifies whether the layer will have z-values. Checked—The layer will have z-values. Unchecked—The layer will not have z-values. This is the default.	Boolean
Extent (Optional)	The extent of the layer. This parameter is only used if Define spatial properties for the layer is checked (spatial_properties = DEFINE_SPATIAL_PROPERTIES in Python). The extent must include all features in the table. Default—The extent will be based on the maximum extent of all participating inputs. This is the default. Current Display Extent—The extent is equal to the data frame or visible display. The option is not available when there is no active map. As Specified Below—The extent will be based on the minimum and maximum extent values specified. Browse—The extent will be based on an existing dataset.	Extent

Derived Output

Label	Explanation	Data Type
Output Layer	The output query layer.	Table View

Python

arcpy.management.MakeQueryLayer(input_database, out_layer_name, query, {oid_fields}, {shape_type}, {srid}, {spatial_reference}, {spatial_properties}, {m_values}, {z_values}, {extent})

Name	Explanation	Data Type
input_database	The database connection file that contains the data to be queried.	Workspace
out_layer_name	The output name of the feature layer or table view to be created.	String
query	The SQL statement that defines the select query to be issued to the database.	String
oid_fields [oid_fields,...] (Optional)	One or more fields from the SELECT statement SELECT list that will generate a dynamic, unique row identifier.	String
shape_type (Optional)	Specifies the shape type of the query layer. Only those records from the result set of the query that match the specified shape type will be used in the output query layer. Tool validation will attempt to set this property based on the first record in the result set. This can be changed before executing the tool if it is not the desired output shape type. This parameter is ignored if the result set of the query does not return a geometry field. POINT—The output query layer will use point geometry. MULTIPOINT—The output query layer will use multipoint geometry. POLYGON—The output query layer will use polygon geometry. POLYLINE—The output query layer will use polyline geometry.	String
srid (Optional)	The spatial reference identifier (SRID) value for queries that return geometry. Only those records from the result set of the query that match the specified SRID value will be used in the output query layer. Tool validation will attempt to set this property based on the first record in the result set. This can be changed before executing the tool if it is not the desired output SRID value. This parameter is ignored if the result set of the query does not return a geometry field.	String
spatial_reference (Optional)	The coordinate system that will be used by the output query layer. Tool validation will attempt to set this property based on the first record in the result set. This can be changed before executing the tool if it is not the desired output coordinate system. This parameter is ignored if the result set of the query does not return a geometry field.	Spatial Reference
spatial_properties (Optional)	Specifies how the spatial properties for the layer will be defined. During the validation process, dimensionality, geometry type, spatial reference, SRID, and unique identifier properties will be set on the query layer. These values are based on the first row returned in the query. To manually define these properties instead of the tool querying the table to get them, use the default value for this parameter. DEFINE_SPATIAL_PROPERTIES—Manually define the spatial properties of the layer. This is the default. DO_NOT_DEFINE_SPATIAL_PROPERTIES—Layer properties will be determined based on the first row returned in the query.	Boolean
m_values (Optional)	Specifies whether the layer will have m-values. INCLUDE_M_VALUES—The layer will have m-values. DO_NOT_INCLUDE_M_VALUES—The layer will not have m-values. This is the default.	Boolean
z_values (Optional)	Specifies whether the layer will have z-values. INCLUDE_Z_VALUES—The layer will have z-values. DO_NOT_INCLUDE_Z_VALUES—The layer will not have z-values. This is the default.	Boolean
extent (Optional)	The extent of the layer. This parameter is only used if Define spatial properties for the layer is checked (spatial_properties = DEFINE_SPATIAL_PROPERTIES in Python). The extent must include all features in the table. MAXOF—The maximum extent of all inputs will be used. MINOF—The minimum area common to all inputs will be used. DISPLAY—The extent is equal to the visible display. Layer name—The extent of the specified layer will be used. Extent object—The extent of the specified object will be used. Space delimited string of coordinates—The extent of the specified string will be used. Coordinates are expressed in the order of x-min, y-min, x-max, y-max.	Extent

Derived Output

Name	Explanation	Data Type
out_layer	The output query layer.	Table View

Code sample

MakeQueryLayer example 1 (Python window)

The following Python window script demonstrates how to use the MakeQueryLayer tool in immediate mode.

import arcpy

sr = arcpy.SpatialReference("WGS 1984 UTM Zone 12N")

arcpy.MakeQueryLayer_management("Connections/moab.sde",
                                "Slickrock",
                                "select * from moabtrails where name = 'slickrock'",
                                "OBJECTID",
                                "POLYLINE",
                                "32611",
                                sr)

MakeQueryLayer example 2 (stand-alone script)

The following stand-alone script demonstrates how to use the MakeQueryLayer tool.

# Name: MakeQueryLayer.py
# Description: Creates an output query layer based on a where clause.
#   This example shows how to create a spatial reference object using the
#   name of a coordinate system. It also demonstrates how to use two fields
#   to generate a dynamic unique row identifier for the query layer.


# Import system modules
import arcpy

# Create the spatial reference for the output layer.
sr = arcpy.SpatialReference("WGS 1984 UTM Zone 12N")

# Run the tool
arcpy.MakeQueryLayer_management("Connections/moab.sde",
                                "Single Track",
                                "select * from moabtrails where type = 'single'",
                                "UID;name",
                                "POLYLINE",
                                "32611",
                                sr)

Environments

Current Workspace, Output Coordinate System