How to: Execute SQL

This guide demonstrates how to create an expression that executes an SQL query to a PostgreSQL database using the ODBC driver. The ODBC driver for PostgreSQL must be installed on the target machine before starting.

Please note that calling the executeScalar function will immediately put the script module into demo mode if it is not licensed

Open Monokot Server Administrator and double-click Scripts on the Server Explorer pane. Click New Expression, set the name PgDateTime for the expression that appears and set the STRING type for the return data. Insert the following code into the expression code editor:

var connectionString = 'DRIVER={PostgreSQL UNICODE};Server=localhost;Port=5432;UID=postgres;PWD=qwerty;';
return MosOdbc.executeScalar(connectionString, 'SELECT now();');

Note that in the server connection line you need to specify your server credentials (Server, Port, UID, PWD). Press Ctrl + Enter to apply the change in the code editor.

Go to the Triggers tab and click Add Periodic. In order for the changes to take effect on the server, click the Sync button. Thus, the expression will return the current date and time received from PostgreSQL every 500 ms.

You can find the full set of MosOdbc functions and their descriptions here.