[AccessD] Inserting a set amount of records into a table

A great trick that is very useful in situations like this.

John W. Colby
www.ColbyConsulting.com 

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-----Original Message-----
From: accessd-bounces at databaseadvisors.com
[mailto:accessd-bounces at databaseadvisors.com] On Behalf Of Hale, Jim
Sent: Thursday, February 10, 2005 4:04 PM
To: 'Access Developers discussion and problem solving'
Subject: RE: [AccessD] Inserting a set amount of records into a table


It is possible to create the 24 records using SQL by doing a non Cartesian
join. Create a table with one field. Create 48 one field records (this
assumes that 48 is the max number you will be dealing with), the first
record has the number 1, the second 2, etc. Create a query with this table
where the criteria is set to <= the value of numports. Now create a query
with the table (or query) that has your equipment record and the query you
created above. Do not join the two tables/queries. When you run this query
the result set will be 24 records because without a join every record in
table/query A is "joined" to every record in table/query B. This result set
can then be inserted into whatever table is desired. I have used this
technique successfully to create event records for selected dates. Obviously
it is only really viable for small tables (like yours) since joining every
record in one table to every record in another table can quickly create a
monster. A technique with perhaps limited use but it does have its place in
the toolbox IMHO. Jim Hale

-----Original Message-----
From: John Clark [mailto:John.Clark at niagaracounty.com]
Sent: Thursday, February 10, 2005 2:04 PM
To: accessd at databaseadvisors.com
Subject: [AccessD] Inserting a set amount of records into a table


I have been whipping up a db to track our routers and switchs, and where
they are wired to...eventually, I'd like to print a report that would be a
wire map for a given piece of equipment.

I've got it working pretty well, but I'd like to add one more thing before
unveiling it. I have a form where each record is a separate piece of
equipment, and a subform on this form, that will list all ports and where
they go. Currently I have to enter 24 records for a 24 port switch and 48
records if it is a 48 port switch. I would like for it to automatically add
24 or 48 records, depending on the value in the numPorts field.

I have never done anything like this before, but I am thinking that I will
need some sort of FOR or DO WHILE loop that cycles through and INSERTS a
record until it reaches the value of numPorts. Is this the gist of it? I
really haven't worked with inserting records at all, so if there is anything
I should know here, I'd appreciate it.

Thanks

John W Clark
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