1 files changed, 119 insertions, 0 deletions
diff --git a/lib/python2.7/site-packages/django/db/backends/mysql/introspection.py b/lib/python2.7/site-packages/django/db/backends/mysql/introspection.py
new file mode 100644
index 0000000..548877e
--- /dev/null
+++ b/lib/python2.7/site-packages/django/db/backends/mysql/introspection.py
@@ -0,0 +1,119 @@
+import re
+from .base import FIELD_TYPE
+
+from django.db.backends import BaseDatabaseIntrospection, FieldInfo
+from django.utils.encoding import force_text
+
+
+foreign_key_re = re.compile(r"\sCONSTRAINT `[^`]*` FOREIGN KEY \(`([^`]*)`\) REFERENCES `([^`]*)` \(`([^`]*)`\)")
+
+class DatabaseIntrospection(BaseDatabaseIntrospection):
+    data_types_reverse = {
+        FIELD_TYPE.BLOB: 'TextField',
+        FIELD_TYPE.CHAR: 'CharField',
+        FIELD_TYPE.DECIMAL: 'DecimalField',
+        FIELD_TYPE.NEWDECIMAL: 'DecimalField',
+        FIELD_TYPE.DATE: 'DateField',
+        FIELD_TYPE.DATETIME: 'DateTimeField',
+        FIELD_TYPE.DOUBLE: 'FloatField',
+        FIELD_TYPE.FLOAT: 'FloatField',
+        FIELD_TYPE.INT24: 'IntegerField',
+        FIELD_TYPE.LONG: 'IntegerField',
+        FIELD_TYPE.LONGLONG: 'BigIntegerField',
+        FIELD_TYPE.SHORT: 'IntegerField',
+        FIELD_TYPE.STRING: 'CharField',
+        FIELD_TYPE.TIME: 'TimeField',
+        FIELD_TYPE.TIMESTAMP: 'DateTimeField',
+        FIELD_TYPE.TINY: 'IntegerField',
+        FIELD_TYPE.TINY_BLOB: 'TextField',
+        FIELD_TYPE.MEDIUM_BLOB: 'TextField',
+        FIELD_TYPE.LONG_BLOB: 'TextField',
+        FIELD_TYPE.VAR_STRING: 'CharField',
+    }
+
+    def get_table_list(self, cursor):
+        "Returns a list of table names in the current database."
+        cursor.execute("SHOW TABLES")
+        return [row[0] for row in cursor.fetchall()]
+
+    def get_table_description(self, cursor, table_name):
+        """
+        Returns a description of the table, with the DB-API cursor.description interface."
+        """
+        # varchar length returned by cursor.description is an internal length,
+        # not visible length (#5725), use information_schema database to fix this
+        cursor.execute("""
+            SELECT column_name, character_maximum_length FROM information_schema.columns
+            WHERE table_name = %s AND table_schema = DATABASE()
+                AND character_maximum_length IS NOT NULL""", [table_name])
+        length_map = dict(cursor.fetchall())
+
+        # Also getting precision and scale from information_schema (see #5014)
+        cursor.execute("""
+            SELECT column_name, numeric_precision, numeric_scale FROM information_schema.columns
+            WHERE table_name = %s AND table_schema = DATABASE()
+                AND data_type='decimal'""", [table_name])
+        numeric_map = dict([(line[0], tuple([int(n) for n in line[1:]])) for line in cursor.fetchall()])
+
+        cursor.execute("SELECT * FROM %s LIMIT 1" % self.connection.ops.quote_name(table_name))
+        return [FieldInfo(*((force_text(line[0]),)
+                            + line[1:3]
+                            + (length_map.get(line[0], line[3]),)
+                            + numeric_map.get(line[0], line[4:6])
+                            + (line[6],)))
+            for line in cursor.description]
+
+    def _name_to_index(self, 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(self.get_table_description(cursor, table_name))])
+
+    def get_relations(self, 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.
+        """
+        my_field_dict = self._name_to_index(cursor, table_name)
+        constraints = self.get_key_columns(cursor, table_name)
+        relations = {}
+        for my_fieldname, other_table, other_field in constraints:
+            other_field_index = self._name_to_index(cursor, other_table)[other_field]
+            my_field_index = my_field_dict[my_fieldname]
+            relations[my_field_index] = (other_field_index, other_table)
+        return relations
+
+    def get_key_columns(self, cursor, table_name):
+        """
+        Returns a list of (column_name, referenced_table_name, referenced_column_name) for all
+        key columns in given table.
+        """
+        key_columns = []
+        cursor.execute("""
+            SELECT column_name, referenced_table_name, referenced_column_name
+            FROM information_schema.key_column_usage
+            WHERE table_name = %s
+                AND table_schema = DATABASE()
+                AND referenced_table_name IS NOT NULL
+                AND referenced_column_name IS NOT NULL""", [table_name])
+        key_columns.extend(cursor.fetchall())
+        return key_columns
+
+    def get_indexes(self, cursor, table_name):
+        cursor.execute("SHOW INDEX FROM %s" % self.connection.ops.quote_name(table_name))
+        # Do a two-pass search for indexes: on first pass check which indexes
+        # are multicolumn, on second pass check which single-column indexes
+        # are present.
+        rows = list(cursor.fetchall())
+        multicol_indexes = set()
+        for row in rows:
+            if row[3] > 1:
+                multicol_indexes.add(row[2])
+        indexes = {}
+        for row in rows:
+            if row[2] in multicol_indexes:
+                continue
+            indexes[row[4]] = {'primary_key': (row[2] == 'PRIMARY'), 'unique': not bool(row[1])}
+        return indexes
+