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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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/**
 * @AllowToRunInFind
 *
 * @properties={typeid:24,uuid:"088B830C-2A4F-483C-A135-5FA32A010AE9"}
 */
function doFind(){
	if(foundset.isInFind()){
		foundset.search();
		application.setUIProperty(APP_UI_PROPERTY.LEAVE_FIELDS_READONLY_IN_FIND_MODE, false)    // reset to the default
	} else {
		application.setUIProperty(APP_UI_PROPERTY.LEAVE_FIELDS_READONLY_IN_FIND_MODE, true);    // before entering find mode, enforce read-only fields
		foundset.find();
	}
}

Canceling Find Mode

Find mode can be programmatically cancelled by invoking the loadAllRecords method of the foundset. The foundset will revert to the query prior to entering find mode.

Complex Searches

Servoy's find mode can be used to easily satisfy even complex search requirements. Remember that any related foundset may be used to enter criteria and that any number of search records may be used in any foundset and any operators may be used in combination for every data provider.

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Calculation as a Record-Level

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Variable

In general, a calculation is a ready-only data provider, its value being generated each time it is read. However, in one exception a calculation may be used to cache data for a record, thus becoming a read/write in-memory data provider. This is done by creating a calculation which has no return statement. Such a calculation will be treated a little differently. It can actually store a value in memory for an individual record.

Example In this example, a record-level variable is created by defining an empty calculation. 

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