ODB Page

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Links

• mhttpd MIDAS web server
• Status Page
• Message Page
• ODB Page
• Programs Page
• Alarms Page
• MSCB Page
• History Page
• Custom Page
• Sequencer Page
• odbedit

Purpose

The purpose of the mhttpd ODB page is to allow the user to browse, search and edit the ODB of an experiment. This gives a graphical alternative to using the ODB editor odbedit.

Access the ODB page

Click image(s) to enlarge

Figure 1: ODB Page example

The ODB Page is accessed from the Status Page (or one of the other Pages) by clicking on the menu-button ODB.

The top level ODB trees will be visible as key-links (i.e.links to a key) (Figure 1).

Note

If "ODB" button is not present on the Status Page, it may have been suppressed.

Browse the ODB

Figure 2: ODB Page Listing

By clicking on the key-links on the ODB page (Figure 1), the user can browse the various subtrees. By clicking on the "+" link adjacent to the "Value" heading (Figure 2) , the type and size of the keys are shown. This is equivalent to the odbedit commands ls and ls -l.

By clicking on a key, the user can change the value (unless password-protected or the key is write-protected - see Security). If web access is restricted, the user will be asked for a password the first time he/she attempts to edit a value.

Create a key

Click to enlarge thumbnails

• 

  Figure 3a:
  Create a key

• 

  Figure 3b:
  Create a subdirectory

• 

  Figure 3c:
  Create a symbolic link

The user can create a new key in a tree or subtree on the ODB Page by clicking the Create button. The Type of key to be created is selected from the drop-down list (Figure 3). The choices are shown in Table 1.

Note

Create allows you to create a subdirectory (Figure 3b) or a symbolic link (Figure 3c) as well as a regular key (Figure 3a).

Table 1: ODB Key Types

Key Types
Integer(32-bit)	Float (4 bytes)
String	Multi-line String
Subdirectory	Byte
Signed byte	Character (8-bit)
Word (16-bit)	Short integer(16-bit)
Double Word (32-bit)	Boolean
Double float(8 Bytes)	Symbolic link

Delete a key

Figure 4: ODB page Delete a key

The user can delete a key in a tree or subtree by clicking the Delete button. The user selects which to delete from a list of the keys in the subtree (e.g. Figure 4).

Search the ODB for a key

Figure 5: ODB Page Find pop-up

Click on the Find button. A pop-up (Figure 5) appears in which the user types the relevant information.

Create Elog entry

Figure 6: ODB Page Elog pop-up

An elog entry can be created easily from the ODB page by clicking the

Create Elog from this page button. A pop-up will appear for the user to fill in (Figure 6).

Limitations

The ODB Page editor supports a subset of the functionality of odbedit. For example, the ODB Page editor does not support re-ordering or renaming ODB keys. For full editing capabilities odbedit must be used.