[Phpmyadmin-devel] [Fwd: csv -> mysql]

Sebastian Mendel lists at sebastianmendel.de
Mon Jun 12 11:27:01 CEST 2006

Hash: SHA1

Michal ?iha? schrieb:
> Hi
> On Mon, 12 Jun 2006 09:59:20 +0200
> Sebastian Mendel <lists at sebastianmendel.de> wrote:
>> in english: is it possible to automatically create a table from CSV
>> file? in other words: auto detect field type by content?
> IMHO it could be possible, however there could be several problems:
> - what length should be char fields? text or varchar?
> - detecting field type from whole file can take very long, so you need
> to scan only few lines and then somehow handle error when your
> expectation fails later

just scan first few lines and insert line by line - if error occurs
alter table to fit new line, or just before insert check field content
length and alter table than insert also check content type for example
if first 1000 lines only numbers and than comes some text you need to
alter table field to text - of course this could take a long time with
large cvs files

or just scan first few lines (let user decide how much lines) and than
(optionally) recommend the table structure to the user and let him
decide to change or use the recommendation - if we cannot save the file
in a temp dir the user needs to upload the file twice

- --- import CVS -----------------------------------
| File:       ________ [...]
- --------------------------------------------------

- --- [ ] Auto-Create new Table from CVS -----------
| Scan lines: _____100
|    [ ] use temporary table to store/analyze data
| [ ] Review Table structure before create
- --------------------------------------------------

> We might simply choose to import everything to text fields and then
> let MySQL create 'optimal' structure by SELECT * FROM `table`
> PROCEDURE ANALYSE (). But it tends to create ENUMs for small set of
> values.

- --
Sebastian Mendel

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