T-FLEX Parametric CAD. Fundamentals. 2D Design

DATABASES
Databases
Databases provide a means for manageable data storage. A database is a set of rows (records). Each row
(record) consists of distinct columns (fields). Each field is identified by its name.
A typical example of a database is a table provided in The Engineering Reference (V.I. Anuriev, vol. 1, p.
682. Bushings (GOST 12215-66) for latches and mounting rods.)
Bushing GOST code
12215-66
d
H D
GOST 12215-66
D1
l R = c Weight, kg
per GOST 12215-66
7030-0172 4 6 8 8 1,2 0,2 0,002
7030-0173 6 8 10 10 1,5 0,6 0,003
7030-0174 8 10 12 12 1,5 0,6 0,005
7030-0175 10 12 16 16 1,5 0,6 0,012
As was mentioned in the earlier chapters, the main merit of T-FLEX CAD system is support for creating
parametric models. In T-FLEX CAD, you do not need to create separate drawings for bushings of different
diameters. You just create a parametric model of a bushing, and then get various modifications of the
bushing by sourcing respective table values to the parameters of the construction elements.
Let’s review the ways of creating and storing information in a table within the application and the means of
accessing this information.
T-FLEX provides to ways of storing data. The first way is storing data in an external file in one of the
standard formats (for example, the dBASE format). Such files can be created either by using T-FLEX CAD
or by any other applications designed for this purpose. The second way is storing data within a particular
drawing. This approach allows faster access to the necessary information, keeps the file system free of
additional files and allows easily porting drawings from one location to another.
We will call the databases stored together with the drawing Internal Databases (from now on referred to as
databases, or DBs), while all the rest - External Databases.
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