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- LOGO DATA BASE
-
-
- Written by: David Malmberg
-
- List Processing in LOGO-Part 3
- A LOGO Data Base for the C-64
- PowerPlay Magazine, September 1985
- Page 114
-
-
- David is continuing his series on
-
- List Processing using the language of
-
- LOGO. This month he develops a full
-
- fledged data base.
-
- Whenever you wish to develop a new
-
- data base, begin by using the
-
- original copy of the program. This
-
- will make sure that you are using a
-
- 'fresh' copy.
-
- The first thing you want to do when
-
- using the data base is define the
-
- record fields. You do that by
-
- giving the command:
-
- CREATE "FACTS [DATE TIME PLACE]
-
- This would define a file named
-
- FACTS with three fields (DATE, TIME,
-
- and PLACE).
-
- To add to the data base you give
-
- the command:
-
- ADD "FACTS
-
- The computer then prompts you to
-
- enter your information. When you are
-
- finished entering your data, enter
-
- QUIT to the ENTRY? prompt.
-
- To display all records, type:
-
- DISPLAY EVERY "FACTS
-
- To save your records to disk, type:
-
- SAVE "FACTS
-
- You can search your data base by
-
- typing:
-
- DISPLAY SELECTED "FACTS
-
- You will then be given a menu that
-
- will allow you to pick your mode of
-
- search. You can search ANY fields,
-
- you can search only the KEYWORD
-
- fields, or you can search only the
-
- ENTRY field. The data that you are
-
- searching is numeric, the program
-
- will display a total of all records
-
- found.
-
- To delete your records, you can
-
- type:
-
- DELETE EVERY "FACTS
-
- This will delete all records in the
-
- file. You can also DELETE SELECTED
-
- "FACTS. This allows you to delete
-
- only the records that you specify.
-
-
- **** NOTE ****
-
- Because of the nature of this
- program, it can not be RUN from the
- LOADSTAR environment. The actual
- program is on Side 2 of this issue.
- It is saved under the name of:
-
- DATA.LOGO
-
-
- This program is copyrighted by
-
- PowerPlay Magazine. All rights to it
-
- are reserved. LOADSTAR has relieved
-
- you from the burden of keying in this
-
- program, For more complete
-
- information about this program, refer
-
- to the September 1985 issue of
-
- PowerPlay Magazine.
-
-
- >Files used: DATA.LOGO
-
- ----------< end of article >----------
-
-
-