Formula Reference

A formula is a symbolic statement of the manipulations you want to perform on certain data. JReport provides a number of built-in functions for you to build your formula. Also it provides user-defined formula (UDF) functions that allow you to design your own formula functions according to your requirements. Generally, formulas can be used:

• to calculate information you cannot obtain directly from database data fields,
• to compare data,
• to join text with data,
• to convert data from one form to another,
• to enhance the formatting options with text strings, and
• to do a number of other things to customize your reports.

When the built-in functions cannot satisfy your needs, you can design your own formula functions. JReport provides user-defined formula (UDF) functions to implement it.

This chapter contains the following topics:

• Formula syntax
• Data type
• Built-in functions
• Operators