Overview

Project website postgis.net
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Source code repository https://git.osgeo.org/gitea/postgis/postgis.git
Repository branch stable-3.2
Last remote commit Push to 3.2.6dev milestone 6e2c5206d
Regina Obe authored yesterday
Weblate repository https://weblate.osgeo.org/git/postgis_branch_32/postgis/
File mask doc/po/*/using_raster_dataman.xml.po
Translation file Download doc/po/fr/using_raster_dataman.xml.po
Last change None
Last author None

String statistics

Strings percent Hosted strings Words percent Hosted words Characters percent Hosted characters
Total 179 4,141 32,259
Translated 16% 30 2% 108 2% 885
Needs editing 0% 0 0% 0 0% 0
Read-only 0% 0 0% 0 0% 0
Failing checks 5% 9 1% 31 1% 274
Strings with suggestions 82% 147 97% 4,018 96% 31,279
Untranslated strings 83% 149 97% 4,033 97% 31,374
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Quick numbers

4,141
Hosted words
179
Hosted strings
16%
Translated
1
Contributors
and previous 30 days

Trends of last 30 days

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Hosted words
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Translated
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+100%
Contributors
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User avatar anonymous

Suggestion added

postgis_branch_32 / using_raster_dataman — French

SELECT oid, lowrite(lo_open(oid, 131072), png) As num_bytes
FROM
( VALUES (lo_create(0),
ST_AsPNG( (SELECT rast FROM aerials.boston WHERE rid=1) )
) ) As v(oid,png);
-- you'll get an output something like --
oid | num_bytes
---------+-----------
2630819 | 74860

-- next note the oid and do this replacing the c:/test.png to file path location
-- on your local computer
\lo_export 2630819 'C:/temp/aerial_samp.png'

-- this deletes the file from large object storage on db
SELECT lo_unlink(2630819);
SELECT oid, lowrite(lo_open(oid, 131072), png) As num_bytes
FROM
( VALUES (lo_create(0),
ST_AsPNG( (SELECT rast FROM aerials.boston WHERE rid=1) )
) ) As v(oid,png);
-- vous obtiendrez un résultat semblable à --
oid | num_bytes
---------+-----------
2630819 | 74860

-- noter ensuite l'oid et remplacer le c:/test.png par le chemin d'accès au fichier
-- sur votre ordinateur local
\lo_export 2630819 'C:/temp/aerial_samp.png'

-- cela supprime le fichier du stockage des gros objets sur la base de données
SELECT lo_unlink(2630819);
9 days ago
User avatar anonymous

Suggestion added

postgis_branch_32 / using_raster_dataman — French

Unlike the python approach, this approach creates the file on your local computer.
Contrairement à l'approche python, cette approche crée le fichier sur votre ordinateur local.
9 days ago
User avatar anonymous

Suggestion added

postgis_branch_32 / using_raster_dataman — French

Sadly PSQL doesn't have easy to use built-in functionality for outputting binaries. This is a bit of a hack that piggy backs on PostgreSQL somewhat legacy large object support. To use first launch your psql commandline connected to your database.
Malheureusement, PSQL n'a pas de fonctionnalité intégrée facile à utiliser pour produire des binaires. Il s'agit d'une astuce qui s'appuie sur le support des gros objets de PostgreSQL. Pour l'utiliser, lancez d'abord votre ligne de commande psql connectée à votre base de données.
9 days ago
User avatar anonymous

Suggestion added

postgis_branch_32 / using_raster_dataman — French

Outputting Rasters with PSQL
Sortie de données raster avec PSQL
9 days ago
User avatar anonymous

Suggestion added

postgis_branch_32 / using_raster_dataman — French

--write out 5 images to the PostgreSQL server in varying sizes
-- note the postgresql daemon account needs to have write access to folder
-- this echos back the file names created;
SELECT write_file(ST_AsPNG(
ST_AsRaster(ST_Buffer(ST_Point(1,5),j*5, 'quad_segs=2'),150*j, 150*j, '8BUI',100)),
'C:/temp/slices'|| j || '.png')
FROM generate_series(1,5) As j;

write_file
---------------------
C:/temp/slices1.png
C:/temp/slices2.png
C:/temp/slices3.png
C:/temp/slices4.png
C:/temp/slices5.png
-- écrire 5 images de tailles différentes sur le serveur PostgreSQL
-- noter que le compte du deamon postgresql doit avoir un accès en écriture au dossier
-- ceci renvoie les noms des fichiers créés ;
SELECT write_file(ST_AsPNG(
ST_AsRaster(ST_Buffer(ST_Point(1,5),j*5, 'quad_segs=2'),150*j, 150*j, '8BUI',100)),
'C:/temp/slices'|| j || '.png')
FROM generate_series(1,5) As j;

write_file
---------------------
C:/temp/slices1.png
C:/temp/slices2.png
C:/temp/slices3.png
C:/temp/slices4.png
C:/temp/slices5.png
9 days ago
User avatar anonymous

Suggestion added

postgis_branch_32 / using_raster_dataman — French

<![CDATA[CREATE OR REPLACE FUNCTION write_file (param_bytes bytea, param_filepath text)
RETURNS text
AS $$
f = open(param_filepath, 'wb+')
f.write(param_bytes)
return param_filepath
$$ LANGUAGE plpythonu;]]>
<![CDATA[CREATE OR REPLACE FUNCTION write_file (param_bytes bytea, param_filepath text)
RETURNS text
AS $$
f = open(param_filepath, 'wb+')
f.write(param_bytes)
return param_filepath
$$ LANGUAGE plpythonu;]]>
9 days ago
User avatar anonymous

Suggestion added

postgis_branch_32 / using_raster_dataman — French

This is a plpython stored function that creates a file in the server directory for each record. Requires you have plpython installed. Should work fine with both plpythonu and plpython3u.
Il s'agit d'une fonction stockée en plpython qui crée un fichier dans le répertoire du serveur pour chaque enregistrement. Nécessite l'installation de plpython. Elle devrait fonctionner correctement avec plpythonu et plpython3u.
9 days ago
User avatar anonymous

Suggestion added

postgis_branch_32 / using_raster_dataman — French

Use PLPython to dump out images via SQL
Utiliser PLPython pour extraire des images via SQL
9 days ago
User avatar anonymous

Suggestion added

postgis_branch_32 / using_raster_dataman — French

// Code for SaveQueryImage.java
<![CDATA[import java.sql.Connection;
import java.sql.SQLException;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.io.*;

public class SaveQueryImage {
public static void main(String[] argv) {
System.out.println("Checking if Driver is registered with DriverManager.");

try {
//java.sql.DriverManager.registerDriver (new org.postgresql.Driver());
Class.forName("org.postgresql.Driver");
}
catch (ClassNotFoundException cnfe) {
System.out.println("Couldn't find the driver!");
cnfe.printStackTrace();
System.exit(1);
}

Connection conn = null;

try {
conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/mydb","myuser", "mypwd");
conn.setAutoCommit(false);

PreparedStatement sGetImg = conn.prepareStatement(argv[0]);

ResultSet rs = sGetImg.executeQuery();

FileOutputStream fout;
try
{
rs.next();
/** Output to file name requested by user **/
fout = new FileOutputStream(new File(argv[1]) );
fout.write(rs.getBytes(1));
fout.close();
}
catch(Exception e)
{
System.out.println("Can't create file");
e.printStackTrace();
}

rs.close();
sGetImg.close();
conn.close();
}
catch (SQLException se) {
System.out.println("Couldn't connect: print out a stack trace and exit.");
se.printStackTrace();
System.exit(1);
}
}
}]]>
// Code for SaveQueryImage.java
<![CDATA[import java.sql.Connection;
import java.sql.SQLException;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.io.*;

public class SaveQueryImage {
public static void main(String[] argv) {
System.out.println("Checking if Driver is registered with DriverManager.");

try {
//java.sql.DriverManager.registerDriver (new org.postgresql.Driver());
Class.forName("org.postgresql.Driver");
}
catch (ClassNotFoundException cnfe) {
System.out.println("Couldn't find the driver!");
cnfe.printStackTrace();
System.exit(1);
}

Connection conn = null;

try {
conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/mydb","myuser", "mypwd");
conn.setAutoCommit(false);

PreparedStatement sGetImg = conn.prepareStatement(argv[0]);

ResultSet rs = sGetImg.executeQuery();

FileOutputStream fout;
try
{
rs.next();
/** Output to file name requested by user **/
fout = new FileOutputStream(new File(argv[1]) );
fout.write(rs.getBytes(1));
fout.close();
}
catch(Exception e)
{
System.out.println("Can't create file");
e.printStackTrace();
}

rs.close();
sGetImg.close();
conn.close();
}
catch (SQLException se) {
System.out.println("Couldn't connect: print out a stack trace and exit.");
se.printStackTrace();
System.exit(1);
}
}
}]]>
9 days ago
User avatar anonymous

Suggestion added

postgis_branch_32 / using_raster_dataman — French

-- Manifest.txt --
<![CDATA[Class-Path: postgresql-9.0-801.jdbc4.jar
Main-Class: SaveQueryImage]]>
-- Manifest.txt --
<![CDATA[Class-Path: postgresql-9.0-801.jdbc4.jar
Main-Class: SaveQueryImage]]>
9 days ago
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