--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/django/db/backends/oracle/introspection.py	Fri Jul 18 18:22:23 2008 +0000
@@ -0,0 +1,98 @@
+from django.db.backends.oracle.base import DatabaseOperations
+import re
+import cx_Oracle
+
+quote_name = DatabaseOperations().quote_name
+foreign_key_re = re.compile(r"\sCONSTRAINT `[^`]*` FOREIGN KEY \(`([^`]*)`\) REFERENCES `([^`]*)` \(`([^`]*)`\)")
+
+def get_table_list(cursor):
+    "Returns a list of table names in the current database."
+    cursor.execute("SELECT TABLE_NAME FROM USER_TABLES")
+    return [row[0].upper() for row in cursor.fetchall()]
+
+def get_table_description(cursor, table_name):
+    "Returns a description of the table, with the DB-API cursor.description interface."
+    cursor.execute("SELECT * FROM %s WHERE ROWNUM < 2" % quote_name(table_name))
+    return cursor.description
+
+def _name_to_index(cursor, table_name):
+    """
+    Returns a dictionary of {field_name: field_index} for the given table.
+    Indexes are 0-based.
+    """
+    return dict([(d[0], i) for i, d in enumerate(get_table_description(cursor, table_name))])
+
+def get_relations(cursor, table_name):
+    """
+    Returns a dictionary of {field_index: (field_index_other_table, other_table)}
+    representing all relationships to the given table. Indexes are 0-based.
+    """
+    cursor.execute("""
+SELECT ta.column_id - 1, tb.table_name, tb.column_id - 1
+FROM   user_constraints, USER_CONS_COLUMNS ca, USER_CONS_COLUMNS cb,
+       user_tab_cols ta, user_tab_cols tb
+WHERE  user_constraints.table_name = %s AND
+       ta.table_name = %s AND
+       ta.column_name = ca.column_name AND
+       ca.table_name = %s AND
+       user_constraints.constraint_name = ca.constraint_name AND
+       user_constraints.r_constraint_name = cb.constraint_name AND
+       cb.table_name = tb.table_name AND
+       cb.column_name = tb.column_name AND
+       ca.position = cb.position""", [table_name, table_name, table_name])
+
+    relations = {}
+    for row in cursor.fetchall():
+        relations[row[0]] = (row[2], row[1])
+    return relations
+
+def get_indexes(cursor, table_name):
+    """
+    Returns a dictionary of fieldname -> infodict for the given table,
+    where each infodict is in the format:
+        {'primary_key': boolean representing whether it's the primary key,
+         'unique': boolean representing whether it's a unique index}
+    """
+    # This query retrieves each index on the given table, including the
+    # first associated field name
+    # "We were in the nick of time; you were in great peril!"
+    sql = """
+WITH primarycols AS (
+ SELECT user_cons_columns.table_name, user_cons_columns.column_name, 1 AS PRIMARYCOL
+ FROM   user_cons_columns, user_constraints
+ WHERE  user_cons_columns.constraint_name = user_constraints.constraint_name AND
+        user_constraints.constraint_type = 'P' AND
+        user_cons_columns.table_name = %s),
+ uniquecols AS (
+ SELECT user_ind_columns.table_name, user_ind_columns.column_name, 1 AS UNIQUECOL
+ FROM   user_indexes, user_ind_columns
+ WHERE  uniqueness = 'UNIQUE' AND
+        user_indexes.index_name = user_ind_columns.index_name AND
+        user_ind_columns.table_name = %s)
+SELECT allcols.column_name, primarycols.primarycol, uniquecols.UNIQUECOL
+FROM   (SELECT column_name FROM primarycols UNION SELECT column_name FROM
+uniquecols) allcols,
+      primarycols, uniquecols
+WHERE  allcols.column_name = primarycols.column_name (+) AND
+      allcols.column_name = uniquecols.column_name (+)
+    """
+    cursor.execute(sql, [table_name, table_name])
+    indexes = {}
+    for row in cursor.fetchall():
+        # row[1] (idx.indkey) is stored in the DB as an array. It comes out as
+        # a string of space-separated integers. This designates the field
+        # indexes (1-based) of the fields that have indexes on the table.
+        # Here, we skip any indexes across multiple fields.
+        indexes[row[0]] = {'primary_key': row[1], 'unique': row[2]}
+    return indexes
+
+# Maps type objects to Django Field types.
+DATA_TYPES_REVERSE = {
+    cx_Oracle.CLOB: 'TextField',
+    cx_Oracle.DATETIME: 'DateTimeField',
+    cx_Oracle.FIXED_CHAR: 'CharField',
+    cx_Oracle.NCLOB: 'TextField',
+    cx_Oracle.NUMBER: 'DecimalField',
+    cx_Oracle.STRING: 'CharField',
+    cx_Oracle.TIMESTAMP: 'DateTimeField',
+}