1 from django.db.backends.postgresql.base import DatabaseOperations

     1 from django.db.backends import BaseDatabaseIntrospection

     3 quote_name = DatabaseOperations().quote_name

     3 class DatabaseIntrospection(BaseDatabaseIntrospection):

     4     # Maps type codes to Django Field types.

     5     data_types_reverse = {

     6         16: 'BooleanField',

     7         21: 'SmallIntegerField',

     8         23: 'IntegerField',

     9         25: 'TextField',

    10         701: 'FloatField',

    11         869: 'IPAddressField',

    12         1043: 'CharField',

    13         1082: 'DateField',

    14         1083: 'TimeField',

    15         1114: 'DateTimeField',

    16         1184: 'DateTimeField',

    17         1266: 'TimeField',

    18         1700: 'DecimalField',

    19     }

    20         

    21     def get_table_list(self, cursor):

    22         "Returns a list of table names in the current database."

    23         cursor.execute("""

    24             SELECT c.relname

    25             FROM pg_catalog.pg_class c

    26             LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace

    27             WHERE c.relkind IN ('r', 'v', '')

    28                 AND n.nspname NOT IN ('pg_catalog', 'pg_toast')

    29                 AND pg_catalog.pg_table_is_visible(c.oid)""")

    30         return [row[0] for row in cursor.fetchall()]

     5 def get_table_list(cursor):

    32     def get_table_description(self, cursor, table_name):

     6     "Returns a list of table names in the current database."

    33         "Returns a description of the table, with the DB-API cursor.description interface."

     7     cursor.execute("""

    34         cursor.execute("SELECT * FROM %s LIMIT 1" % self.connection.ops.quote_name(table_name))

     8         SELECT c.relname

    35         return cursor.description

     9         FROM pg_catalog.pg_class c

    10         LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace

    11         WHERE c.relkind IN ('r', 'v', '')

    12             AND n.nspname NOT IN ('pg_catalog', 'pg_toast')

    13             AND pg_catalog.pg_table_is_visible(c.oid)""")

    14     return [row[0] for row in cursor.fetchall()]

    16 def get_table_description(cursor, table_name):

    37     def get_relations(self, cursor, table_name):

    17     "Returns a description of the table, with the DB-API cursor.description interface."

    38         """

    18     cursor.execute("SELECT * FROM %s LIMIT 1" % quote_name(table_name))

    39         Returns a dictionary of {field_index: (field_index_other_table, other_table)}

    19     return cursor.description

    40         representing all relationships to the given table. Indexes are 0-based.

    41         """

    42         cursor.execute("""

    43             SELECT con.conkey, con.confkey, c2.relname

    44             FROM pg_constraint con, pg_class c1, pg_class c2

    45             WHERE c1.oid = con.conrelid

    46                 AND c2.oid = con.confrelid

    47                 AND c1.relname = %s

    48                 AND con.contype = 'f'""", [table_name])

    49         relations = {}

    50         for row in cursor.fetchall():

    51             try:

    52                 # row[0] and row[1] are like "{2}", so strip the curly braces.

    53                 relations[int(row[0][1:-1]) - 1] = (int(row[1][1:-1]) - 1, row[2])

    54             except ValueError:

    55                 continue

    56         return relations

    21 def get_relations(cursor, table_name):

    58     def get_indexes(self, cursor, table_name):

    22     """

    59         """

    23     Returns a dictionary of {field_index: (field_index_other_table, other_table)}

    60         Returns a dictionary of fieldname -> infodict for the given table,

    24     representing all relationships to the given table. Indexes are 0-based.

    61         where each infodict is in the format:

    25     """

    62             {'primary_key': boolean representing whether it's the primary key,

    26     cursor.execute("""

    63              'unique': boolean representing whether it's a unique index}

    27         SELECT con.conkey, con.confkey, c2.relname

    64         """

    28         FROM pg_constraint con, pg_class c1, pg_class c2

    65         # This query retrieves each index on the given table, including the

    29         WHERE c1.oid = con.conrelid

    66         # first associated field name

    30             AND c2.oid = con.confrelid

    67         cursor.execute("""

    31             AND c1.relname = %s

    68             SELECT attr.attname, idx.indkey, idx.indisunique, idx.indisprimary

    32             AND con.contype = 'f'""", [table_name])

    69             FROM pg_catalog.pg_class c, pg_catalog.pg_class c2,

    33     relations = {}

    70                 pg_catalog.pg_index idx, pg_catalog.pg_attribute attr

    34     for row in cursor.fetchall():

    71             WHERE c.oid = idx.indrelid

    35         try:

    72                 AND idx.indexrelid = c2.oid

    36             # row[0] and row[1] are like "{2}", so strip the curly braces.

    73                 AND attr.attrelid = c.oid

    37             relations[int(row[0][1:-1]) - 1] = (int(row[1][1:-1]) - 1, row[2])

    74                 AND attr.attnum = idx.indkey[0]

    38         except ValueError:

    75                 AND c.relname = %s""", [table_name])

    39             continue

    76         indexes = {}

    40     return relations

    77         for row in cursor.fetchall():

    78             # row[1] (idx.indkey) is stored in the DB as an array. It comes out as

    79             # a string of space-separated integers. This designates the field

    80             # indexes (1-based) of the fields that have indexes on the table.

    81             # Here, we skip any indexes across multiple fields.

    82             if ' ' in row[1]:

    83                 continue

    84             indexes[row[0]] = {'primary_key': row[3], 'unique': row[2]}

    85         return indexes