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When a user types a value into a text field (which is bound to a specific column of the database table) and clicks out, the Servoy Application Server issues a SQL update command to the database to modify the selected record. The resulting change is also broadcast|display/DOCS/Data+Broadcasting||||||||||||||||||||||||\ to all connected clients.
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The fundamental unit of data binding in both the GUI and the API is the Servoy Foundset|display/DOCS/Foundsets+Concepts||||||||||||||||||||||||\ object.
Client Cache
A Servoy client instance keeps track of which database records are in use. This is called the Client Cache and it optimizes performance by reducing the number of queries made to the database. Records are tracked by primary key. The first time the contents of a record are accessed, the Application Server must issue a query to the database on behalf of the client. The values for all of the columns of the record object are held in memory and therefore, subsequent access of the record will not produce anymore queries to the database. The user experience is greatly enhanced as one can browse quickly between forms and cached records.
A record may fall out of the cache gracefully to conserve memory and is automatically reloaded the next time it is accessed. This happens at the discretion of the client's caching engine, which is highly optimized. Relieved of the burden of managing memory, the developer can focus on more important things.
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Notice that the related foundset, orders_to_order_details, a property of an order record, is immediately available. Also notice that the previous calculation, subtotal, may be referenced, just like any other column. Note that while, calculations are a JavaScript function, unlike regular methods, one does not use the parentheses to invoke their value. Both calculations may be placed on forms like any other data provider. (See image below - calculations are highlighted in green) 
Stored Calculations
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