MATLAB: Undefined function or variable ‘querybuilder’.

databasefunctionMATLAB

Why do I get this message and how do I fix it?

Best Answer

The querybuilder function is part of the Database Toolbox. You can find more information http://www.mathworks.com/products/database/.

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MATLAB: Do I get the ??? Undefined function or variable ‘getTheMetaData’. error message with the Database Toolbox

This error message indicates that you are trying to connect to a database in read-only mode. The MATLAB Visual Query Builder does not support read-only connections. You initially will be able to connect to the database with a read-only username and password; but subsequent operations will generate errors.

To make a read-only connection, use the command line functionality of the Database Toolbox. e.g.

% Make connection to a database called SampleDB with username
% scott and password tiger
conn=database('SampleDB','scott','tiger');
% Execute a valid SQL statement against the database connection, conn
% and opens a cursor
curs = exec( conn, 'select freight from orders' );
% Import data from the open SQL cursor curs.
curs = fetch(curs);

For more information on using the Database Toolbox functions, please refer to Chapter 3 of the Database Toolbox User's Guide.

MATLAB: Can I query a PostgreSQL/PostGIS database from MATLAB

It is possible using Database Toolbox as described in this technical note :

How do I specify the Database URL String in the DATABASE function of Database Toolbox 3.4(R2007b) to connect to a POSTGRESQL database?

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MATLAB: Do I get the ??? Undefined function or variable ‘getTheMetaData’. error message with the Database Toolbox

MATLAB: Can I query a PostgreSQL/PostGIS database from MATLAB

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