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@ -13,63 +13,12 @@ |
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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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<p>This module allows the LargeObject Field to be previewed by |
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the Preview Dialog. It is installed automatically with the MuK |
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Preview Dialog module. It has no direct visible effect on the |
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system. It allows LargeObejct fields to be previewed by the Preview |
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Dialog.</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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