JoinTableToLayer()

Summary

Permanently joins a single table to a geographic file.

 

Syntax

JoinTableToLayer(string database, string layer, string class, string primary, string secondary, string field, array options)

 

Argument	Contents
database	The path and file name of the database
layer	The name of the layer
class	The class of the table (FFB, FFA, CSV, DBASE)
primary	The primary filename of the table
secondary	The secondary filename of the table
field	The field in the table used for linking

 

Option	Type	Contents
Hide ID	Boolean	"True" to hide the ID field in the database, or "False" (the default) if the ID field should be displayed.
Hide Link	Boolean	"True" to hide the link field in the table, or "False" (the default) if the link field should be displayed.
Symmetric	Boolean	"True" if the table and the layer contain exactly the same records; i.e., each record in the layer has a corresponding record in the table, and each record in the table has a corresponding record in the layer. "False" (the default) otherwise.
Ordinal	Boolean	"True" if the Nth geographic record matches the Nth table record; "False" (the default) otherwise. Ordinal implies Symmetric. If you specify Ordinal, you do not need to specify Symmetric.

 

Notes

• The file types include FFA for fixed-format text (ASCII), FFB for fixed-format binary, and CSV for comma-separated text (values).

• The ID field of the database (geographic file) is used to create the left side of the join.

• For Compact Geographic files, the Hide ID and Hide Link options are mutually exclusive.

• For Standard Geographic files, the Hide ID option and the Ordinal option are not supported.

• If the table's secondary filename has the same name as its primary filename and uses the default extension for the table's class, then it may be passed as null.

• If the path to the primary filename matches the path to the database, then the primary filename is recorded with no path. In this case, Maptitude attempts to open the table in the same directory as the geographic file, allowing the table files to be moved with the geographic files to a new directory. Otherwise, the primary filename is recorded with the specified path, and Maptitude attempts to open the table in that location regardless of the location of the geographic file.

• JoinTableToLayer() does not verify the supplied information. It does not check that the table exists, or contains the specified field. Maptitude attempts to establish the specified join when the geographic database is opened. At that time, if the table does not exist, or does not contain the specified field, then the join fails and the geographic file opens without the table.

• If the Symmetric option is specified, then the resulting join takes advantage of any permanent indices that exist in the table. Otherwise, these indices are ignored.

• If the Ordinal option is specified, the field parameter is ignored and may be passed as null.

• The Ordinal option is used only for compact (.CDF) geography file. It will be ignored if the table is being joined to a standard (.DBD) geography file.

Example

folder = RunMacro("G30 Tutorial Folder")

JoinTableToLayer(folder + "cthwy.cdf", "Highways", "FFB", folder + "cthwy.bin", , "ID", {{"Hide Link", "True"}})

 

Error Codes

Error Type	Meaning
NotFound	The specified geographic file does not exist
Error	The specified geographic file is read-only

 

See Also

Function	Summary
JoinViews()	Creates a joined view by linking fields in two existing views