38 lines
1.5 KiB
Python
38 lines
1.5 KiB
Python
"""
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Custom fields
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"""
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from __future__ import absolute_import
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from django.db.models.fields import AutoField
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class UnsignedBigIntAutoField(AutoField):
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"""
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An unsigned 8-byte integer for auto-incrementing primary keys.
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"""
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def db_type(self, connection):
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if connection.settings_dict['ENGINE'] == 'django.db.backends.mysql':
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return "bigint UNSIGNED AUTO_INCREMENT"
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elif connection.settings_dict['ENGINE'] == 'django.db.backends.sqlite3':
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# Sqlite will only auto-increment the ROWID column. Any INTEGER PRIMARY KEY column
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# is an alias for that (https://www.sqlite.org/autoinc.html). An unsigned integer
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# isn't an alias for ROWID, so we have to give up on the unsigned part.
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return "integer"
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elif connection.settings_dict['ENGINE'] == 'django.db.backends.postgresql_psycopg2':
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# Pg's bigserial is implicitly unsigned (doesn't allow negative numbers) and
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# goes 1-9.2x10^18
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return "BIGSERIAL"
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else:
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return None
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def rel_db_type(self, connection):
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if connection.settings_dict['ENGINE'] == 'django.db.backends.mysql':
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return "bigint UNSIGNED"
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elif connection.settings_dict['ENGINE'] == 'django.db.backends.sqlite3':
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return "integer"
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elif connection.settings_dict['ENGINE'] == 'django.db.backends.postgresql_psycopg2':
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return "BIGSERIAL"
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else:
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return None
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