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Your SQL queries are defined in the configuration.xml file. The database connector looks for this file in

  • Standalone bundle - <db-home>\database\database-connector-2.5.3\config.
  • frevvo-tomcat bundle - The location you specified in <frevvo-home>\tomcat\conf\frevvo-config.properties via the frevvo.connectors.database.configuration property.
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By default, optional/empty form fields will send/return an empty string. This is controlled by the emit Null column attribute. When this attribute is enabled, the DB connector does not return any value for the empty database columns.

You can disable the default behavior for the whole db connector or at the queryset/query level.

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