app/django/db/backends/oracle/introspection.py
author Madhusudan.C.S <madhusudancs@gmail.com>
Wed, 03 Jun 2009 23:38:02 +0530
changeset 2385 174e946039e0
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Introduced 'module_package' key in params dict to support modules in melange
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
323
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
     1
from django.db.backends import BaseDatabaseIntrospection
54
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff changeset
     2
import cx_Oracle
323
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
     3
import re
54
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff changeset
     4
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff changeset
     5
foreign_key_re = re.compile(r"\sCONSTRAINT `[^`]*` FOREIGN KEY \(`([^`]*)`\) REFERENCES `([^`]*)` \(`([^`]*)`\)")
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff changeset
     6
323
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
     7
class DatabaseIntrospection(BaseDatabaseIntrospection):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
     8
    # Maps type objects to Django Field types.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
     9
    data_types_reverse = {
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    10
        cx_Oracle.CLOB: 'TextField',
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    11
        cx_Oracle.DATETIME: 'DateTimeField',
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    12
        cx_Oracle.FIXED_CHAR: 'CharField',
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    13
        cx_Oracle.NCLOB: 'TextField',
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    14
        cx_Oracle.NUMBER: 'DecimalField',
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    15
        cx_Oracle.STRING: 'CharField',
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    16
        cx_Oracle.TIMESTAMP: 'DateTimeField',
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    17
    }
54
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff changeset
    18
323
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    19
    def get_table_list(self, cursor):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    20
        "Returns a list of table names in the current database."
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    21
        cursor.execute("SELECT TABLE_NAME FROM USER_TABLES")
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    22
        return [row[0].upper() for row in cursor.fetchall()]
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    23
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    24
    def get_table_description(self, cursor, table_name):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    25
        "Returns a description of the table, with the DB-API cursor.description interface."
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    26
        cursor.execute("SELECT * FROM %s WHERE ROWNUM < 2" % self.connection.ops.quote_name(table_name))
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    27
        return cursor.description
54
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff changeset
    28
323
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    29
    def table_name_converter(self, name):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    30
        "Table name comparison is case insensitive under Oracle"
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    31
        return name.upper()
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    32
        
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    33
    def _name_to_index(self, cursor, table_name):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    34
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    35
        Returns a dictionary of {field_name: field_index} for the given table.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    36
        Indexes are 0-based.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    37
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    38
        return dict([(d[0], i) for i, d in enumerate(self.get_table_description(cursor, table_name))])
54
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff changeset
    39
323
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    40
    def get_relations(self, cursor, table_name):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    41
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    42
        Returns a dictionary of {field_index: (field_index_other_table, other_table)}
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    43
        representing all relationships to the given table. Indexes are 0-based.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    44
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    45
        cursor.execute("""
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    46
    SELECT ta.column_id - 1, tb.table_name, tb.column_id - 1
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    47
    FROM   user_constraints, USER_CONS_COLUMNS ca, USER_CONS_COLUMNS cb,
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    48
           user_tab_cols ta, user_tab_cols tb
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    49
    WHERE  user_constraints.table_name = %s AND
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    50
           ta.table_name = %s AND
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    51
           ta.column_name = ca.column_name AND
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    52
           ca.table_name = %s AND
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    53
           user_constraints.constraint_name = ca.constraint_name AND
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    54
           user_constraints.r_constraint_name = cb.constraint_name AND
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    55
           cb.table_name = tb.table_name AND
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    56
           cb.column_name = tb.column_name AND
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    57
           ca.position = cb.position""", [table_name, table_name, table_name])
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    58
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    59
        relations = {}
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    60
        for row in cursor.fetchall():
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    61
            relations[row[0]] = (row[2], row[1])
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    62
        return relations
54
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff changeset
    63
323
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    64
    def get_indexes(self, cursor, table_name):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    65
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    66
        Returns a dictionary of fieldname -> infodict for the given table,
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    67
        where each infodict is in the format:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    68
            {'primary_key': boolean representing whether it's the primary key,
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    69
             'unique': boolean representing whether it's a unique index}
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    70
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    71
        # This query retrieves each index on the given table, including the
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    72
        # first associated field name
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    73
        # "We were in the nick of time; you were in great peril!"
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    74
        sql = """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    75
    WITH primarycols AS (
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    76
     SELECT user_cons_columns.table_name, user_cons_columns.column_name, 1 AS PRIMARYCOL
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    77
     FROM   user_cons_columns, user_constraints
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    78
     WHERE  user_cons_columns.constraint_name = user_constraints.constraint_name AND
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    79
            user_constraints.constraint_type = 'P' AND
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    80
            user_cons_columns.table_name = %s),
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    81
     uniquecols AS (
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    82
     SELECT user_ind_columns.table_name, user_ind_columns.column_name, 1 AS UNIQUECOL
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    83
     FROM   user_indexes, user_ind_columns
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    84
     WHERE  uniqueness = 'UNIQUE' AND
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    85
            user_indexes.index_name = user_ind_columns.index_name AND
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    86
            user_ind_columns.table_name = %s)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    87
    SELECT allcols.column_name, primarycols.primarycol, uniquecols.UNIQUECOL
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    88
    FROM   (SELECT column_name FROM primarycols UNION SELECT column_name FROM
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    89
    uniquecols) allcols,
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    90
          primarycols, uniquecols
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    91
    WHERE  allcols.column_name = primarycols.column_name (+) AND
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    92
          allcols.column_name = uniquecols.column_name (+)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    93
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    94
        cursor.execute(sql, [table_name, table_name])
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    95
        indexes = {}
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    96
        for row in cursor.fetchall():
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    97
            # row[1] (idx.indkey) is stored in the DB as an array. It comes out as
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    98
            # a string of space-separated integers. This designates the field
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
    99
            # indexes (1-based) of the fields that have indexes on the table.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
   100
            # Here, we skip any indexes across multiple fields.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
   101
            indexes[row[0]] = {'primary_key': row[1], 'unique': row[2]}
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
   102
        return indexes
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 54
diff changeset
   103