When files are added to the File Repository, metadata about each file is recorded in the table exp.Data.
The information about each file includes:
- File Name
- URL
- Download Link
- Thumbnail Link
- Inline Thumbnail image
- etc...
View the Query Browser
To access the table, developers and admins can:
- Go to > Go to Module > Query.
- Click to open the schema exp and the query Data.
- Click View Data.
By default, the name, runID (if applicable) and URL are included. You can use the
(Grid views) > Customize Grid option to show additional columns or
create a custom grid view.
Create a Query Web Part
To create a grid that shows the metadata columns, do one of the following:
- Create a custom view of the grid exp.Data, and expose the custom view by adding a Query web part.
- Create a custom query using exp.Data as the base query, and add the columns using SQL. For example, the following SQL query adds the columns InlineThumbnail and DownloadLink to the base query:
SELECT Data.Name,
Data.Run,
Data.DataFileUrl,
Data.InlineThumbnail,
Data.DownloadLink
FROM Data
Pulling Metadata from File Paths
You can pull out more metadata, if you conform to a path naming pattern.
In the following example, CT and PET scans have been arranged in the following folder pattern:
scans
├───patient1
│ ├───CT
│ └───PET
└───patient2
├───CT
└───PET
The following SQL query harvests out the patient id and the scan type from the directory structure above.
SELECT Data.Name as ScanName,
Data.DataFileUrl,
split_part(DataFileUrl, '/', 8) as Ptid,
split_part(DataFileUrl, '/', 9) as ScanType
FROM Data
WHERE locate('/@files/scans', DataFileUrl) > 0
The result is a table of enhanced metadata about the files, which provides new columns you can filter on, to narrow down to the files of interest.
Related Topics
