DBRESTRICTIONS function

Returns a character string that describes features that are not supported for this database. You can use this function with OpenEdge DataServers.

Syntax


DBRESTRICTIONS ( { `integer-expression` \| `logical-name` \| `alias` } [ , `table-name` ] )

integer-expression

The sequence number of a database the ABL session is connected to. For example, DBRESTRICTIONS(1) returns information on the first database the ABL session is connected to, DBRESTRICTIONS(2) returns information on the second database the ABL session is connected to, and so on. If you specify a sequence number that does not correspond to a database the ABL session is connected to, the DBRESTRICTIONS function returns the Unknown value (?).

logical-name or alias

These forms of the DBRESTRICTIONS function require a character expression as a parameter. An unquoted character string is not permitted. If the parameter is an alias or the logical name of a connected database, then the AVM returns the database restrictions string. Otherwise, it returns the Unknown value (?).

table-name

A character expression equal to the name of a table in the specified database. An unquoted character string is not permitted. If the table name is valid, DBRESTRICTIONS returns the list of unsupported features for the specified table. Otherwise, it returns the Unknown value (?).

Example

This procedure displays the logical name and database restrictions of all connected databases:

r-dbrest.p
DEFINE VARIABLE ix AS INTEGER NO-UNDO. REPEAT ix = 1 to NUM-DBS: DISPLAY LDBNAME(ix) LABEL "Database" DBRESTRICTIONS(ix) FORMAT "x(40)" LABEL "Restrictions". END.

Notes

If you want to use the DBRESTRICTIONS function for a database, you must be connected to the database in the current ABL session.

DBRESTRICTIONS returns a string. This string is a comma-separated list of keywords that represent features not supported by the specified database. Table 25 shows the possible keywords and their descriptions.

Table 25: DBRESTRICTIONS keyword values
Keyword	Description
COUNT-OF	Cannot use the COUNT-OF function.
LAST	Cannot invoke the FIND LAST statement.
PREV	Cannot invoke the FIND PREV statement.
READ-ONLY	The database or table is available for read only.
RECID	Cannot use the RECID function.
SET-CURRENT-VALUE	Cannot set the current value of sequence generators.
SETUSERID	Cannot use the SETUSERID function.

For example, if the database is accessed through a manager that does not support FIND LAST and FIND PREV, then the DBRESTRICTIONS function returns the string LAST, PREV.

The possible keyword values returned by DBRESTRICTIONS depends on the DataServer type. Table 26 shows the possible values returned for each DataServer.

Table 26: DBRESTRICTIONS return values by DataServer
DataServer	Possible return values
ODBC	"COUNT-OF,LAST,PREV,READ-ONLY,RECID,SETUSERID"
ORACLE	"LAST,PREV,READ-ONLY,RECID,SETUSERID, SET-CURRENT-VALUE"
OpenEdge	"READ-ONLY"

Note: The available DataServers depend on your version of OpenEdge. For more information, see your OpenEdge DataServer documentation.

The form of the returned string makes it easy to use with the ENTRY and LOOKUP function.

If you connect to a database with the Read Only (-RO) parameter, the AVM lists the character string READ-ONLY in the restrictions list for that database.