UniBasic Commands Reference - Rocket Software

READV
Syntax
READV var FROM [file.var,] record.ID.expr, attribute.expr
[ON ERROR statements] {THEN statements [END] | ELSE statements [END]}
Description
The UniBasic READV command assigns the data from an attribute of a record to a
variable.
Note: READV ignores locks. To update a record, you should use the READVU
command, which checks for locks. For an explanation of UniData locks, see
Developing UniBasic Applications..
Tip: To improve efficiency, use READV when only one or two attributes are needed
from a record. If access to more attributes is needed, READ or MATREAD is more
efficient.
Parameters
The following table describes each parameter of the syntax.
Parameter Description
var Specifies a dynamic array to contain the attribute.
FROM file.var, Specifies the file from which to read the record.
If you do not specify a file.var, UniData reads from the default
file. If no default file is open, a fatal error occurs.
The default file is one for which no file variable is assigned in
the OPEN statement.
record.ID.expr Specifies the record to read.
attribute.expr Specifies the attribute to read.
READV Parameters
READV 1-647