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The Formula language is a scripting language used by Lotus Notes. It is often referred to as @Formula language (pronounced ''at-formula'') because many language elements start with the @-character. Here is an example of a selection formula:
It was created by Ray Ozzie during the early development of Lotus Notes. He borrowed the compiler and decompiler from the Lotus 1-2-3 spreadsheet, but unlike the spreadsheet language Formula Language was designed primarily for string and list processing, not numerical processing. It was originally a Functional programming language with unique text list-handling features inspired by Ray Ozzie's prior use of Icon and Lisp. The Formula language engine was (rewritten from scratch by Damien Katz ) for Notes and Domino 6. Many (new features ) were added to the language, such as looping and dynamic execution, and performance was improved dramatically. The Formula language has two parts: * ''@Functions'' for calculations and simple logic * ''@Commands'' for performing actions in the user interface ''@Functions'' can be used in several places throughout Lotus Notes. The most important uses are: * to select documents to show to the user in a view (a kind of index) or to select documents for further processing. In this case, the formula will evaluate to a 'true' (selected) or 'false' value (not selected) for each document. * to provide default values for fields, to transform the data entered by the user (like stripping off redundant spaces) and to validate this data. * to get a list of values from a Notes database or even from a relational database (using ODBC). This may be used to provide a user with a list of values to choose from. * to process a set of documents. The formula is placed in an agent, a program or macro that can be started by a user or by the Notes server according to a schedule. When the agent is triggered, the formula executes for each selected document (this a very limited form of a loop). This is an efficient way of changing lots of documents, if the logic is not too complicated. In case of complicated changes, LotusScript is used. ''@Commands'' are like menu commands: they perform actions in the Lotus Notes client. Examples of actions are: * opening a Notes database * creating an e-mail * putting the cursor in a specific data-entry field * closing a window * starting an agent @Commands are primarily used in formulas that are triggered by user action, such as in button formulas. It is possible to combine them with @Functions, for example by making execution of an @command conditional on a field value. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Formula language」の詳細全文を読む スポンサード リンク
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