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<section class="oe_container"> <div class="oe_row oe_spaced"> <h2 class="oe_slogan">MuK PGSQL Large Objects Fields</h2> <h3 class="oe_slogan">PGSQL Large Objects Support for Fields</h3> <h4 class="oe_slogan" style="font-size: 23px;">MuK IT GmbH - www.mukit.at</h4> </div></section>
<section class="oe_container"> <div class="oe_row oe_spaced"> <div class="text-justify" style="max-width: 84%; margin: 16px 8%;"> <h3 class="oe_slogan">Overview</h3> <div class="oe_mt32" style="padding-bottom: 10px; text-align: justify;"> <p>Provides a field to store bytes as PostgreSQL large objects. PostgreSQL offers support for large objects, which provide stream-style access to user data that is stored in a special large-object structure. They are useful with data values too large to be manipulated conveniently as a whole.</p> <h5 style="padding-top: 10px;">Psycopg2 for Python</h5> <p> Psycopg allows access to the large object using the <code>lobject</code> class. Objects are generated using the <code>connection.lobject()</code> factory method. Data can be retrieved either as bytes or as Unicode strings. </p> <p> Psycopg large object support efficient import/export with file system files using the <code>lo_import()</code> and <code>lo_export()</code> libpq functions. </p> <p>Changed in version 2.6: added support for large objects greated than 2GB. Note that the support is enabled only if all the following conditions are verified:</p> <ul> <li>the Python build is 64 bits;</li> <li>the extension was built against at least libpq 9.3;</li> <li>the server version is at least PostgreSQL 9.3 (server_version must be >= 90300).</li> </ul> <p> If Psycopg was built with 64 bits large objects support (i.e. the first two contidions above are verified), the <code>psycopg2.__version__</code> constant will contain the lo64 flag. If any of the contition is not met several lobject methods will fail if the arguments exceed 2GB. </p> </div>
<pre> <code>from odoo.addons.muk_fields_lobject.fields.lobject import LargeObject
class LargeObjectModel(models.Model):
data_content = LargeObject(string="Data")
@api.multi def data(self): for record in self: bytes = record.data_content oid = record.with_context({'oid': True}).data_content size = record.with_context({'bin_size': True}).data_content stream = record.with_context({'stream': True}).data_content </code> </pre> </div> </div></section>
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