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89 lines
3.1 KiB
89 lines
3.1 KiB
<section class="oe_container">
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<div class="oe_row oe_spaced">
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<h2 class="oe_slogan">MuK PGSQL Large Objects</h2>
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<h3 class="oe_slogan">PGSQL Large Objects Support</h3>
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<h4 class="oe_slogan" style="font-size: 23px;">MuK IT GmbH -
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www.mukit.at</h4>
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</div>
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</section>
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<section class="oe_container">
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<div class="oe_row oe_spaced">
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<div class="oe_picture">
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<h3 class="oe_slogan">Overview</h3>
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<div class="oe_mt32"
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style="padding-bottom: 10px; text-align: justify;">
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<p>Provides a field to store bytes as PostgreSQL large objects.
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PostgreSQL offers support for large objects, which provide
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stream-style access to user data that is stored in a special
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large-object structure. They are useful with data values too large
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to be manipulated conveniently as a whole.</p>
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<h5 style="padding-top: 10px;">Psycopg2 for Python</h5>
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<p>
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Psycopg allows access to the large object using the
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<code>lobject</code>
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class. Objects are generated using the
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<code>connection.lobject()</code>
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factory method. Data can be retrieved either as bytes or as Unicode
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strings.
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</p>
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<p>
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Psycopg large object support efficient import/export with file
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system files using the
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<code>lo_import()</code>
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and
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<code>lo_export()</code>
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libpq functions.
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</p>
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<p>Changed in version 2.6: added support for large objects
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greated than 2GB. Note that the support is enabled only if all the
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following conditions are verified:</p>
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<ul>
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<li>the Python build is 64 bits;</li>
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<li>the extension was built against at least libpq 9.3;</li>
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<li>the server version is at least PostgreSQL 9.3
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(server_version must be >= 90300).</li>
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</ul>
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<p>
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If Psycopg was built with 64 bits large objects support (i.e. the
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first two contidions above are verified), the
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<code>psycopg2.__version__</code>
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constant will contain the lo64 flag. If any of the contition is not
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met several lobject methods will fail if the arguments exceed 2GB.
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</p>
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</div>
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<pre>
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<code>
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from odoo.addons.muk_fields_lobject import fields as lobject_fields
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class LargeObjectModel(models.Model):
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data_content = lobject_fields.LargeObject(string="Data")
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@api.multi
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def data(self):
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for record in self:
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bytes = record.data_content
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oid = record.with_context({'oid': True}).data_content
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size = record.with_context({'bin_size': True}).data_content
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stream = record.with_context({'stream': True}).data_content
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</code>
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</pre>
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</div>
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</div>
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</section>
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<section class="oe_container oe_dark" style="margin-top: 450px;">
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<h3 class="oe_slogan">Help and Support</h3>
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<div class="oe_slogan">
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<a class="btn btn-primary btn-lg mt8" href="mailto:sale@mukit.at">
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<i class="fa fa-envelope"></i> Email
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</a> <a class="btn btn-primary btn-lg mt8"
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href="https://mukit.at/page/contactus"> <i class="fa fa-phone"></i>
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Contact
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</a>
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</div>
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<img src="logo.png" style="width: 200px; margin-bottom: 20px;"
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class="center-block">
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</section>
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