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auto incremental numbers

Thread began 10/06/2010 7:50 am by i.edwards384429 | Last modified 10/06/2010 10:23 am by i.edwards384429 | 1083 views | 5 replies |

i.edwards384429

auto incremental numbers

Hi

I've created a database following the tutorial setting the first field a ID and makeing that auto incremental and the primary key.


I now want another field to be called product_ref to be auto incremetal and start at 5000

so I set the field name

set it to integar set it to auto increment

set the default to 5000

However when I select save I get the error

"incorrect definition there can only be one auto colum and it must be defined as a key"

where have I gone wrong

thanks

Ian

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Jason ByrnesWebAssist

This is a limitation to MySQL

Only one column in the database can be set to Auto Increment. MySQL will not allow you to have 2 Auto Increment columns.

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Willi Schneider

Originally Said By: i.edwards384429
  "incorrect definition there can only be one auto colum and it must be defined as a key"  



Hi

The answer is in the error message "there can only be one auto column"

Although I think, I know what you are trying to achieve, there is no workaround for DataAssist at the moment, at least I'm not aware of any. I hope DA3 will cover such a feature.
Interakt had this in their "MX Kollection" "Nextensio" lists and forms. The solution was to run a "transaction" right before creating a new database entry, which added an "auto-increment" value to a second column.
Take a look here for a detailed explanation:
041136_setordercolumn.htm

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i.edwards384429

update

thanks for the assist

Ian

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Dave BuchholzBeta Tester

Ian,

you can set the initial value to increment from when setting up your table like so:

DROP TABLE IF EXISTS `tablename`;
CREATE TABLE IF NOT EXISTS `tablename` (
fields go here
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=5000 ;
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i.edwards384429

update

Thanks Dave

I'll have a look tomorrow

Ian

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