User`s guide

Report Processing Model
B.1 Overview
Crystal Reports uses a three-pass reporting method to generate reports. The sections below describe
what happens during each step of this process. To see a visual representation, refer to the flow-chart
at the end of this section.
B.1.1 What is a "pass"?
A pass is a process that Crystal Reports uses each time the data is read or manipulated. Depending
on the complexity of the report Crystal Reports may make 1, 2, or 3 passes over the data. This feature
allows for complex reporting and formula manipulation.
B.1.2 Pre-pass 1
When previewing a report, the first elements to be evaluated are "constant" formulas. Constant formulas
are those that have a constant value for the entire report. They do not change from record to record.
For example, 100* 30 would be a constant formula. Constant formulas are evaluated at the beginning
of the print generation process and are never evaluated again. This process is known as
"BeforeReadingRecords." If you were to place a constant formula field (i.e., 100*30) in the Details
section, the result would be 3000 for each record displayed.
B.1.3 Pass 1
After the "BeforeReadingRecords" process has taken place, Crystal Reports begins reading the database
records. During the record reading process, the following will occur:
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Report Processing Model