
translation (ODBC data source) layer. The data source must analyze the request and translate it again
into a format that can be understood by the DBMS. This complex process can fail at any of several
possible levels.
In addition, ODBC data sources must be correctly configured and set up in the Odbc.ini and Odbcinst.ini
files before they can be used. If you create a report on one system and try to open it on another system
that does not have the same ODBC data source set up, Crystal Reports will not be able to connect to
the data.
When working with ODBC, you should also be aware that the SQL language used by ODBC is based
on the standards set for the SQL language by the American National Standards Institute (ANSI). Some
SQL-based DBMS applications, however, provide additional features to the SQL language that are
specific to that DBMS. If your data uses features unique to your DBMS, ODBC will not be able to
translate those features (though in many cases it will still retrieve most of the data). See The SQL
language.
A.3.3 Five layers
The process by which Crystal Reports accesses data from an ODBC data source consists of five layers:
• Crystal Reports layer
• ODBC translation layer
• ODBC layer
• DBMS translation (ODBC data source) layer
• Database layer
By using the Structured Query Language (SQL), all five layers can conveniently pass data from the
database to your report.
A.3.3.1 Crystal Reports layer
When working with ODBC data, Crystal Reports generates an SQL statement that requests the
appropriate data from ODBC. The powerful SQL generator built into Crystal Reports is designed to
create an SQL statement that will let the ODBC data source or ODBC itself do as much of the report
generation as possible, returning only the data needed to produce the report.
2012-03-14657
Accessing Data Sources
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