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ABase.doc
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1977-12-31
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210 lines
WELCOME TO ABASE !
------------------ NOTE ----------------------
SORRY FOR GRAMMAR ERRORS !!!
------------------ DOC -----------------------
1.Starting Out
--------------
Start the program via CLI/Shell typing abase <ENTER> or from WorkBench.After
this, if tittle appears press any key/mouse button to enter the main screen.
If something went wrong (out of memory seems to be the only problem) program
will exit without leaving a message.
2.Main Screen
-------------
Gadgets on the left side are divided on three sections:
File Gadgets - New,Open,Close,Exit
Main Functions - Insert,Update,Select,Delete
Prefs - QUERY ON/OFF/LOAD,MEM ON/OFF,PRT ON/OFF,LINE ON/OFF
Bottom of the screen is reserved for messages.
Prefs values can be changed simply by clicking on them.
Right now,you have only two options:define a new database with New,or
opening (loading) from disk by Open.You can choose if your database is
going to be held in memory on disc:MEM ON stands for MEMory ON and therefore
tells program to keep all records in memory and save on exit. MEMory OFF
constantly saves changes to disk.If you want security and perhaps have 512K
you may want to keep data on disc,but I strongly suggest to use (default)
memory mode to vastly improve speed.
If you defined/opened database use main functions to DO WHATEVER YOU WANT !
Names and the whole processes are pretty self-explanating but here are details
about every function :
**************************************************************************
1.New
This function lets you to define new database.Every database consists of
number of fields.Maximum this program allows is ten.
In the new window there are number of gadgets:
Name - every database should have a proper name like 'Record Collection'
or 'Phone Book'
Add - adds field to list
Edit - changes selected field.Ffields are selected(highlighted on screen) by
clicking on field list
Delete - removes field from list
Ok,Cancel - guess...
After Selecting Add or Edit brand new window appears where you have to give
full field description.
Name - field name
Field type can be:
NUMERIC - integer between +2000000000 and -20000000000 (approximately !?)
STRING - line of text.Len determines the maximum length
FLOAT - floating point number
BOOLEAN - yes/no
DATE - date (really ??!!??)
Field can have some flags like:
NOT NULL - when inserting data you MUST enter some value for this field.
UNIQUE - also,when inserting data you CAN'T specify value which already
exists in database (every value must be unique)
Ok confirms Cancel returns without changing
Although in maybe looks confusing after little practise you will surely
master the whole process.It's important to design field carefully:after
defining database you can't change this values.Also,when defining STRING
field try not to waste memory and disk space.
**************************************************************************
2.Open
This opens a database from disk.File name is choosed from File Requester,
and if you have some problems with it,try looking down...
**************************************************************************
3.Close
With this option,you can save data to disk (if data is held in memory),
an enable opening/defining a new database.
**************************************************************************
4.Exit
If you have any data in memory program will warn you.Ok mean exit and
Cancel mean exit.Otherwise exits.
**************************************************************************
5.Insert
Finally.With this option you can insert new record(s) to database.List of
fields will appear you can just enter some values.Click Ok to save (or the
program will warn you that something went wrong) and Cancel means 'enough,
return to main screen'.
Things to point:proper values for BOOLEAN fields are be 'yes' or 'no'
(NO capitals) and date format is 'dd/mm/yy' (30/12/1973 no 30.12.1973
no 30-Dec-1973).This of course stands for DATE fields
**************************************************************************
6.Update
This option allows you to edit contents of the database.Actually,before
editing you may determine which records you want to edit and if you are
not familiar with this procedure see 9.QUERY at once !
Similar to Insert (and if you want to edit data you have surely inserted
some !) list of fields appears now with values.Commands available:
Prev - previous record
Next - next record
Save - save changes
Cancel - return to main menu
**************************************************************************
7.Select
Again SQL term (more about SQL later).Select displays records found with
query.There are two ways of displaying (see 12.LINE and 11.PRT).Commands
in the bottom:
Prev - backward
Next - forward
Cancel - return
**************************************************************************
8.Delete
With Delete you can remove (get rid of) unwanted records,again found from
query.DANGER!If your data is entirely in memory you can't restore this !
This is the reason why program force you to confirm
ATTENTION:if QUERY ON is choosed,this means you want to delete ALL RECORDS !
**************************************************************************
9.QUERY ON/OFF/LOAD
Three possible values are:
QUERY ON - default,ask user every time to enter query
QUERY OFF - no entering,use ALL records
QUERY LOAD - load a saved query
Query is powerful method of selecting data from database.You may know it
as 'filter'.It can be used for Update/Select/Delete to mark the records
you want to edit/display/delete.
In the query window beside list of fields you'll see four columns.They are
(from left to right)
Display : (Has a 'D' at the top).This determines the fields you want to
see/edit in Select/Update
Sort : (Has a 'S' at the top).This may mark the field you want to use
for sorting
Operators:Clicking on gadget from this column shows you the operator which
will be used in conjunction with data on the right.
For NUMERIC,STRING,FLOAT there are following operators available:
=,<,>,<=,>=,<>
For BOOLEAN: Is,Is Not
For DATE: Equal,Before,After,Differ
Condition is :
<data in database> <operator> <data on the right>
Record which 'passes the filter' is record which has all
conditions (ie. in all rows) true.
If operator field is empty no condition will be made.
Data : Actual data (mentioned above),inserted in just like in the
Insert option.
Example 1:Suppose you have two fields 'NAME' and 'SALARY'.If you want to
see all workers which have salary bigger than 5000 click on
operators column until you see '>' and than enter 5000 on the
right (All this of course in SALARY row !)
Beside this there are Ok,Save (saves query to disk),Cancel.
This topics is surely hard to explain on this way,but experiment and you'll
find yourself using it with ease just after few minutes.
**************************************************************************
10.MEM ON/OFF
I think you know this already.Before defining/opening database you can
decide if database is going to be held in memory (MEM ON) or frequently
accessed from disc (MEM OFF).Use:
MEM ON:Always.Speeedy.
MEM OFF:If you have 512K and database bigger than 300K (I'd really like
to see this !!!).
**************************************************************************
11.PRT ON/OFF
When PRT is turned ON all data displayed with Select,will be printed too.
Be sure you have set up your printer in preferences
**************************************************************************
12.LINE ON/OFF
This determines the way Select displays records:
LINE ON:All data in one record will be put in one line.You'll get three
lines displayed ie. 3 records at once.
LINE OFF:Only one record will be displayed at the time.
**************************************************************************
FILE REQUESTER
You already know how to handle such things - get the right dir and enter
the filename.If you press ENTER on the start it will display current
directory
**************************************************************************
CREDITS
Program,Utilities,Documentation by Vulovic Djordje
Design,Helping by Slijepcevic Igor
New version is on the way and your comments and suggestions are highly
desirable.
ALFA Production Team: Vulovic Djordje
Nova Skojevska 41/11
11090 Belgrade
Yugoslavia