Обсуждение: PostgreSQL Array Use
Hello, The project MyJSQLView will provided basic support for array types in PostgreSQL at the next release. Information is desired from anyone that uses arrays in PostgreSQL to effect this support. Just a couple of questions. 1. What Size, <10 or 100's, 1000's of elements? 2. Single or Multi-Dimensional? 3. What data types? Any input would be welcome. Thanks, danap.
On Mon, Mar 03, 2008 at 10:42:50AM -0700, dmp wrote:
> The project MyJSQLView will provided basic support
> for array types in PostgreSQL at the next release.
> Information is desired from anyone that uses arrays
> in PostgreSQL to effect this support.
> 1. What Size, <10 or 100's, 1000's of elements?
<50 elements
> 2. Single or Multi-Dimensional?
single
> 3. What data types?
text
Karsten
wiki.gnumed.de
--
GPG key ID E4071346 @ wwwkeys.pgp.net
E167 67FD A291 2BEA 73BD 4537 78B9 A9F9 E407 1346
On Mon, 03 Mar 2008 10:42:50 -0700 dmp <danap@ttc-cmc.net> wrote: > Hello, > The project MyJSQLView will provided basic support > for array types in PostgreSQL at the next release. > Information is desired from anyone that uses arrays > in PostgreSQL to effect this support. Just a couple > of questions. > > 1. What Size, <10 or 100's, 1000's of elements? 100's > 2. Single or Multi-Dimensional? Single > 3. What data types? Integers and Characters > Any input would be welcome. > Thanks, > danap. > > ---------------------------(end of > broadcast)--------------------------- TIP 2: Don't 'kill -9' the > postmaster >
On Mar 3, 2008, at 12:42 PM, Josh Trutwin wrote: > On Mon, 03 Mar 2008 10:42:50 -0700 > dmp <danap@ttc-cmc.net> wrote: > >> Hello, >> The project MyJSQLView will provided basic support >> for array types in PostgreSQL at the next release. >> Information is desired from anyone that uses arrays >> in PostgreSQL to effect this support. Just a couple >> of questions. >> >> 1. What Size, <10 or 100's, 1000's of elements? > > 100's > >> 2. Single or Multi-Dimensional? > > Single > >> 3. What data types? > > Integers and Characters Where are you getting this information. Here's the first three sentences from the manual's chapter on arrays: " PostgreSQL allows columns of a table to be defined as variable- length multidimensional arrays. Arrays of any built-in or user- defined base type can be created. (Arrays of composite types or domains are not yet supported, however.)" In addition, wrt question #1, I haven't found anything specifying any kind of limit on the number of elements and array field can hold. I would thus expect that you'd be more limited by 1G field size limit via TOAST, i.e. the total size of the elements would be capped at 1G which would be a different number of elements for different types. Erik Jones DBA | Emma® erik@myemma.com 800.595.4401 or 615.292.5888 615.292.0777 (fax) Emma helps organizations everywhere communicate & market in style. Visit us online at http://www.myemma.com
On Mon, Mar 03, 2008 at 01:22:17PM -0600, Erik Jones wrote: > Where are you getting this information. IMO the OP wanted to know how people *use* arrays, not how one *can* use arrays. Karsten -- GPG key ID E4071346 @ wwwkeys.pgp.net E167 67FD A291 2BEA 73BD 4537 78B9 A9F9 E407 1346
On Mon, 3 Mar 2008 20:48:55 +0100 Karsten Hilbert <Karsten.Hilbert@gmx.net> wrote: > On Mon, Mar 03, 2008 at 01:22:17PM -0600, Erik Jones wrote: > > > Where are you getting this information. > IMO the OP wanted to know how people *use* arrays, not how > one *can* use arrays. That was my thought, sort of a poll. Hopefully OP isn't confused now. :) Josh
On Mar 3, 2008, at 2:05 PM, Josh Trutwin wrote: > On Mon, 3 Mar 2008 20:48:55 +0100 > Karsten Hilbert <Karsten.Hilbert@gmx.net> wrote: > >> On Mon, Mar 03, 2008 at 01:22:17PM -0600, Erik Jones wrote: >> >>> Where are you getting this information. >> IMO the OP wanted to know how people *use* arrays, not how >> one *can* use arrays. > > That was my thought, sort of a poll. Hopefully OP isn't confused > now. :) Ah, I sure was then :) Erik Jones DBA | Emma® erik@myemma.com 800.595.4401 or 615.292.5888 615.292.0777 (fax) Emma helps organizations everywhere communicate & market in style. Visit us online at http://www.myemma.com
> 1. What Size, <10 or 100's, 1000's of elements?
< 100 elements
> 2. Single or Multi-Dimensional?
2-dimensional
> 3. What data types?
integers
I use arrays of integers, double or numeric, and text. They are 1 or 2 dimensional. They are usually limited to <100 elements in one dimension and <10 in the other. TJ O'Donnell http://www.gnova.com
I was slightly confused. I'm really trying to identify what type of support the project should provide to array types. Just from the input so far, it looks like more needs to be done. If 100's to 1000's of elements are in an array type, the application is going to have some problems. Presently it will adequately handle less then 10 or 20 elements in multi-dimensional arrays, without much problem with adding, editing, & viewing, but 100s to 1000s of elements need a more robust & easy method to view and edit elements. The data type of the array is not a real problem, except bytea and some of the geometry types which have some specific input form requirements. Text might be a problem if the byte size is large. danap. On Mar 3, 2008, at 2:05 PM, Josh Trutwin wrote: > On Mon, 3 Mar 2008 20:48:55 +0100 > Karsten Hilbert <Karsten.Hilbert@gmx.net> wrote: > >> On Mon, Mar 03, 2008 at 01:22:17PM -0600, Erik Jones wrote: >> >>> Where are you getting this information. >> >> IMO the OP wanted to know how people *use* arrays, not how >> one *can* use arrays. > > > That was my thought, sort of a poll. Hopefully OP isn't confused > now. :) Ah, I sure was then :) Erik Jones