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Database Custom Field is a Jira plugin which allows you to associate to an issue a value retrieved from an external database.
After selecting from the configuration screen the data source, the sql to be executed and the column to be mapped to the database custom field, in the screens where the custom field appears the user can choose one value from the set(as a select list or autocomplete box) of retrieved values. Also, each database custom field can have one or more child database custom fields associated, whose values are filled automatically when a value is selected for the database custom field.
Starting from version 1.1 for Jira 4.x and from 2.1 for Jira 5.x, the plugin includes also a new custom field type: Data Table Custom Field, that displays information from a configured data source (a database or a SIL script) in a tabular fashion.