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Please see the Pentaho InfoCenter for the latest version of this document: http://infocenter.pentaho.com/help/topic/pme_user_guide/concept_pme_metadata_formulas.html |
Formula Overview
Formulas have two multiple uses in Pentaho Metadata.
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The second use is in the definition of Physical Table Columns. In addition to Physical table columns mapping directly to a database table column, physical table columns defined in Pentaho Metadata may also be defined as a formula. This allows for combining of multiple columns into a single column, and also for doing more advanced aggregate calculations within aggregate table definitions.
The third use is in the definition of complex joins within business model relationships. This allows for multiple key joins as well as other logic when joining tables.
The fourth use is row level security.
Under the covers, Pentaho Metadata uses JFreeReport's libFormula package for interpreting formulas. The goal is to support OpenFormula syntax within the Metadata environment. Formulas are first interpreted by libFormula, and then within the Metadata system are converted to native SQL depending on the type of database used.
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Function Name | Parameters | Description | Example |
|---|---|---|---|
OR | two or more boolean expression parameters | Returns true if one or more parameters are true | OR( |
AND | two or more boolean expression parameters | Returns true if all parameters are true | AND( |
LIKE | two parameters | Compares a column to a regular expression, using "%" as wild cards | LIKE([BT_CUSTOMERS.BC_CUSTOMERS_CUSTOMERNAME]; "%SMITH%") |
CONTAINS | two parameters | Determines if a column contains a string. | CONTAINS([BT_CUSTOMERS.BC_CUSTOMERS_CUSTOMERNAME]; "SMITH") |
BEGINSWITH | two parameters | Determines if a column begins with a string. | BEGINSWITH([BT_CUSTOMERS.BC_CUSTOMERS_CUSTOMERNAME]; "JOE") |
ENDSWITH | two parameters | Determines if a column ends with a string. | ENDSWITH([BT_CUSTOMERS.BC_CUSTOMERS_CUSTOMERNAME]; "SMITH") |
IN | two or more parameters | Checks to see if the first parameter is in the following list of parameters | IN([BT_CUSTOMERS.BC_CUSTOMERS_CUSTOMERNAME]; "Adam Smith"; "Brian Jones") |
NOW | none | The current date | NOW() |
DATE | three numeric parameters, year, month, and day | A specified date | DATE(2008;4;15) |
DATEVALUE | one text parameter "year-month-day" | A specified date | DATEVALUE("2008-04-15") |
CASE | two or more parameters | Evaluates the first, third, etc parameter, and returns the second, fourth, etc parameter value | CASE( |
COALESCE | one or more parameters | returns the first non null parameter | COALESCE( |
DATEMATH | one expression parameter | returns a date based on an expression. Important note - this does NOT return a timestamp irrespective of the implementation details mentioned in the description to the right.DateMath Javadoc for full syntax | DATEMATH("0:ME -1:DS") - 00:00:00.000 of the day before the last day of the current month |
ISNA | one parameter | returns true if the value is null | ISNA([BT_CUSTOMERS.BC_CUSTOMERS_CUSTOMERID]) |
NULL | none | returns the null value | NULL() |
TRUE | none | returns true | TRUE() |
FALSE | none | returns false | FALSE() |
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