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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">I am working on a program that stores GIS data in a PostgreSQL database, the program is using NHibernate (C#, Npgsql and
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas">NpgsqlParameter bound to columns</span><span lang="EN-US">) to map database objects to entities in the program.</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">My problem is with saving raster data to the database I convert the raster file to a byte array with the format of described in:
<a href="http://trac.osgeo.org/postgis/browser/trunk/raster/doc/RFC2-WellKnownBinaryFormat">
<span style="color:windowtext;text-decoration:none">http://trac.osgeo.org/postgis/browser/trunk/raster/doc/RFC2-WellKnownBinaryFormat</span></a>, (using raster2pgsql.exe and extracting the hex string from the generated SQL).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">And I can’t use the SQL from raster2pgsql.exe to insert/update the database directly I have to do it by a
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas">NpgsqlParameter in an INSERT or UPDATE statement because there are more tables that are updated in the same transaction and objects cached and many clients work against the same server.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The problem is with inserting/updating the raster column from this data.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The SQL used to update/set the raster column looks like this:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">UPDATE "GeoObject" SET "the_geom" = :p0, "the_raster" = :p1, "MetaId" = :p2, "SymbolId" = :p3 WHERE "ObjectId" = :p4<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">It works to set the raster column from a hex string if I add a cast of the raster parameter like this:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">UPDATE "GeoObject" SET "the_geom" = :p0, "the_raster" = :p1::raster, "MetaId" = :p2, "SymbolId" = :p3 WHERE "ObjectId" = :p4<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I can insert smaller raster files like this, but if the file is to big I get an OutOfMemoryException because it can’t allocate a string big enough to hold the hex string.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">And if I try to use a bytea parameter I can’t convert that to raster and I get the error “cannot cast type bytea to raster”.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">Is there a way to insert raster data from the binary equivalence of the hex string raster2pgsql generates ? (A function that takes bytea and returns raster, a reverse of
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas">ST_AsBinary</span><span lang="EN-US">)</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#A31515"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Daniel Hedén<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Sweco Position, Falun Sweden<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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