On 02/04/2005 10:06:49 AM, Ignacio Colmenero wrote:
Hello.
I have been in this list for a very short period of time so, if my questions have been answered before, please tell me and I will browse again in the archives.
1. Is there anything in Postgre or third-party solutions similar to Oracle's SQL Loader, to upload a flat file into a table, according to certain rules? Any solutions you have tried before to solve this issue?
I don't know what you mean by "according to certain rules", but see the SQL COPY command or the psql \copy command (client apps section of the documentation). You can always pre-process your files with awk or whatnot. I've done a bunch of shell scripting to produce INSERT statements and fed them to psql.
2. What are the nuts and bolts to run a SQL script from a batch file? I have browsed the documentation and I haven't seen anything clear.
psql -d database < /path/to/sql-script
It's a Unix thing, although I believe DOS will do this too.
In Unix you could put #!/usr/bin/psql -d database as the first line (and first character) of your sql script and then make the file executable.
3. Can I store more than one polygon in a polygon datatype field, like
((x1,y1),(x2,y2),.),((x10,y10),(x11,y11),.) or I have to install
PostGIS?
There are array data types, but I have not used them. I imagine you could make an array of polygons.
4. Can I query an object in another database, like in Oracle's dblink?
I'm no expert. I don't believe so. You can query across scheams in the same database but not across databases. You could do something (anything!) by writing an external function in C or whatever, but I couldn't say how much work that would take.
Karl <kop@xxxxxxxx> Free Software: "You don't pay back, you pay forward." -- Robert A. Heinlein
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