Shao -
You are correct to assume, that schemas is a fundamental concept in
relational database technology. But it's not a concept limited to
PostGIS but is used throughout all database parts. Allmost all
literature about PostGIS assumes you have some basic knowledge of
PostgreSQl (relational SQL databases).
You can simply visualize the entire database as a set of /containers/
called /schemas/. Each schema (container) contains a set of object like
tables, indexes, views, functions and others. The benefit of dividing
the database into schemas is - among other benefits - that you can
divide all the database objects in logical chunks in a orderly fashion.
As an /example/: You can define security in a database at the schema
level and not the table level. Instead of administer all the individual
tables you work with security on the schema level and afterward place
each of the tables in the relevant schema. This radically minimize the
workload associated with security administration.
If you compare a database to a file-system: The tables would be the
files. The schemas would be the directories where the files reside in.
Take a look at this article
https://www.lifewire.com/definition-of-a-schema-in-a-database-1019262
Den 31-08-2019 kl. 22:58 skrev Shaozhong SHI:
Hi,
Interesting.
Surely, the fundamental is how the data is stored in postgresql and
how it is accessed.
If you come across more detailed articles, please let me know.
In postgis, the term schema is prominent, but it is not well explained
or used.
Regards,
Shao
On Saturday, 31 August 2019, Bo Victor Thomsen
<[email protected] <mailto:[email protected]>> wrote:
Shao -
If you want to visualize spatial data in a Postgres/PostGIS
database using MapInfo as the viewing program you have to:
* Create a schema / table in : *MAPINFO.MAPINFO_MAPCATALOG. *
* Populate it with information about your spatial tables in the
Postgres database. It contains approximately the same
information that's stored in the normal
*public.geometry_columns* view plus some extra MapInfo
specific information.
MapInfo uses this table to get information about the different
spatial tables in the database, so it has to be present and
populated with the correct information.
If you use OGR2OGR to upload spatial data to Postgres, OGR2OGR
*won't***create or populate the *MAPINFO.MAPINFO_MAPCATALOG*
meta-table for you. However, the Easyloader upload program is
capable of that. Finally, you can create and populate the
*MAPINFO.MAPINFO_MAPCATALOG* table manually.
You can download the Easyloader program from the Pitney Bowes
MapInfo Web site (Free download)
I suggest you read (and understand) the following article from the
MapInfo knowledge base:
http://support.pitneybowes.com/VFP05_KnowledgeWithSidebarHowTo?id=kA180000000PNiiCAG
<http://support.pitneybowes.com/VFP05_KnowledgeWithSidebarHowTo?id=kA180000000PNiiCAG>
--
Med venlig hilsen / Kind regards
Bo Victor Thomsen
aestasGIS Denmark
Den 31-08-2019 kl. 17:41 skrev Shaozhong SHI:
Hi, Jeff,
Thanks. We can upload and visualise in qgis.
But, I wonder where upload can include metadata.
If you use qgis, you can use the data, but when you click on
properties, you cannot find metadata.
How to upload metadata into postgis/postgresql?
Regards,
Shao
On Friday, 30 August 2019, Jeff Norville <[email protected]
<mailto:[email protected]>> wrote:
Hi Shao,
I generally use QGIS to visualize postgis / postgresql loads
- but mostly because it's free. But if you're using MapInfo
it seems the EasyLoader may be the way forward - there are
some posts about this over on gis.stackexchange.com
<http://gis.stackexchange.com>, including this guide:
https://www.slideshare.net/peterhorsbollmoller/mapinfo-professional-120-and-sql-server-2008
<https://www.slideshare.net/peterhorsbollmoller/mapinfo-professional-120-and-sql-server-2008>
Best,
Jeff
On Tue, Aug 27, 2019 at 9:03 PM Shaozhong SHI
<[email protected] <mailto:[email protected]>> wrote:
Hi, Tonis,
We will bear that in mind.
A friend of mine says that the problem is not being able
to visualize what got into postgre.
Regards,
Shao
On Tuesday, 27 August 2019, Tõnis Kärdi
<[email protected] <mailto:[email protected]>> wrote:
Hi,
one option would be to use ogr2ogr. And I can't
remember exactly but I think MapInfo's EasyLoader
could do that very fine aswell.
All the best,
Tõnis
On 27.08.19 15:44, Paolo Cavallini wrote:
Not that I know of, but you can use ogr or QGIS
for this.
Cheers.
On 27 August 2019 15:14:06 EEST, Shaozhong SHI
<[email protected]
<mailto:[email protected]>> wrote:
Hi,
Is there a MapInfo to PostGIS/PostgreSQL
loader? For instance, use
psql.exe or something like that?
Regards,
Shao
--
Sorry for being short
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