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86 lines
3.6 KiB
86 lines
3.6 KiB
from django.db.backends import BaseDatabaseIntrospection |
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class DatabaseIntrospection(BaseDatabaseIntrospection): |
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# Maps type codes to Django Field types. |
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data_types_reverse = { |
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16: 'BooleanField', |
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21: 'SmallIntegerField', |
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23: 'IntegerField', |
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25: 'TextField', |
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701: 'FloatField', |
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869: 'IPAddressField', |
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1043: 'CharField', |
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1082: 'DateField', |
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1083: 'TimeField', |
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1114: 'DateTimeField', |
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1184: 'DateTimeField', |
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1266: 'TimeField', |
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1700: 'DecimalField', |
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} |
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def get_table_list(self, cursor): |
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"Returns a list of table names in the current database." |
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cursor.execute(""" |
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SELECT c.relname |
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FROM pg_catalog.pg_class c |
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LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace |
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WHERE c.relkind IN ('r', 'v', '') |
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AND n.nspname NOT IN ('pg_catalog', 'pg_toast') |
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AND pg_catalog.pg_table_is_visible(c.oid)""") |
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return [row[0] for row in cursor.fetchall()] |
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def get_table_description(self, cursor, table_name): |
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"Returns a description of the table, with the DB-API cursor.description interface." |
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cursor.execute("SELECT * FROM %s LIMIT 1" % self.connection.ops.quote_name(table_name)) |
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return cursor.description |
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def get_relations(self, cursor, table_name): |
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""" |
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Returns a dictionary of {field_index: (field_index_other_table, other_table)} |
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representing all relationships to the given table. Indexes are 0-based. |
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""" |
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cursor.execute(""" |
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SELECT con.conkey, con.confkey, c2.relname |
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FROM pg_constraint con, pg_class c1, pg_class c2 |
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WHERE c1.oid = con.conrelid |
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AND c2.oid = con.confrelid |
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AND c1.relname = %s |
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AND con.contype = 'f'""", [table_name]) |
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relations = {} |
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for row in cursor.fetchall(): |
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try: |
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# row[0] and row[1] are like "{2}", so strip the curly braces. |
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relations[int(row[0][1:-1]) - 1] = (int(row[1][1:-1]) - 1, row[2]) |
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except ValueError: |
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continue |
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return relations |
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def get_indexes(self, cursor, table_name): |
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""" |
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Returns a dictionary of fieldname -> infodict for the given table, |
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where each infodict is in the format: |
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{'primary_key': boolean representing whether it's the primary key, |
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'unique': boolean representing whether it's a unique index} |
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""" |
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# This query retrieves each index on the given table, including the |
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# first associated field name |
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cursor.execute(""" |
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SELECT attr.attname, idx.indkey, idx.indisunique, idx.indisprimary |
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FROM pg_catalog.pg_class c, pg_catalog.pg_class c2, |
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pg_catalog.pg_index idx, pg_catalog.pg_attribute attr |
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WHERE c.oid = idx.indrelid |
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AND idx.indexrelid = c2.oid |
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AND attr.attrelid = c.oid |
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AND attr.attnum = idx.indkey[0] |
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AND c.relname = %s""", [table_name]) |
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indexes = {} |
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for row in cursor.fetchall(): |
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# row[1] (idx.indkey) is stored in the DB as an array. It comes out as |
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# a string of space-separated integers. This designates the field |
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# indexes (1-based) of the fields that have indexes on the table. |
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# Here, we skip any indexes across multiple fields. |
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if ' ' in row[1]: |
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continue |
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indexes[row[0]] = {'primary_key': row[3], 'unique': row[2]} |
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return indexes |
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