96 lines
3.7 KiB
Python
96 lines
3.7 KiB
Python
from django.db.backends.mysql_old.base import quote_name
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from MySQLdb import ProgrammingError, OperationalError
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from MySQLdb.constants import FIELD_TYPE
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import re
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foreign_key_re = re.compile(r"\sCONSTRAINT `[^`]*` FOREIGN KEY \(`([^`]*)`\) REFERENCES `([^`]*)` \(`([^`]*)`\)")
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def get_table_list(cursor):
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"Returns a list of table names in the current database."
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cursor.execute("SHOW TABLES")
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return [row[0] for row in cursor.fetchall()]
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def get_table_description(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" % quote_name(table_name))
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return cursor.description
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def _name_to_index(cursor, table_name):
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"""
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Returns a dictionary of {field_name: field_index} for the given table.
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Indexes are 0-based.
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"""
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return dict([(d[0], i) for i, d in enumerate(get_table_description(cursor, table_name))])
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def get_relations(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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my_field_dict = _name_to_index(cursor, table_name)
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constraints = []
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relations = {}
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try:
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# This should work for MySQL 5.0.
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cursor.execute("""
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SELECT column_name, referenced_table_name, referenced_column_name
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FROM information_schema.key_column_usage
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WHERE table_name = %s
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AND table_schema = DATABASE()
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AND referenced_table_name IS NOT NULL
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AND referenced_column_name IS NOT NULL""", [table_name])
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constraints.extend(cursor.fetchall())
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except (ProgrammingError, OperationalError):
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# Fall back to "SHOW CREATE TABLE", for previous MySQL versions.
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# Go through all constraints and save the equal matches.
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cursor.execute("SHOW CREATE TABLE %s" % quote_name(table_name))
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for row in cursor.fetchall():
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pos = 0
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while True:
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match = foreign_key_re.search(row[1], pos)
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if match == None:
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break
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pos = match.end()
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constraints.append(match.groups())
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for my_fieldname, other_table, other_field in constraints:
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other_field_index = _name_to_index(cursor, other_table)[other_field]
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my_field_index = my_field_dict[my_fieldname]
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relations[my_field_index] = (other_field_index, other_table)
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return relations
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def get_indexes(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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cursor.execute("SHOW INDEX FROM %s" % quote_name(table_name))
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indexes = {}
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for row in cursor.fetchall():
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indexes[row[4]] = {'primary_key': (row[2] == 'PRIMARY'), 'unique': not bool(row[1])}
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return indexes
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DATA_TYPES_REVERSE = {
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FIELD_TYPE.BLOB: 'TextField',
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FIELD_TYPE.CHAR: 'CharField',
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FIELD_TYPE.DECIMAL: 'FloatField',
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FIELD_TYPE.DATE: 'DateField',
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FIELD_TYPE.DATETIME: 'DateTimeField',
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FIELD_TYPE.DOUBLE: 'FloatField',
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FIELD_TYPE.FLOAT: 'FloatField',
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FIELD_TYPE.INT24: 'IntegerField',
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FIELD_TYPE.LONG: 'IntegerField',
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FIELD_TYPE.LONGLONG: 'IntegerField',
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FIELD_TYPE.SHORT: 'IntegerField',
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FIELD_TYPE.STRING: 'TextField',
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FIELD_TYPE.TIMESTAMP: 'DateTimeField',
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FIELD_TYPE.TINY: 'IntegerField',
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FIELD_TYPE.TINY_BLOB: 'TextField',
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FIELD_TYPE.MEDIUM_BLOB: 'TextField',
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FIELD_TYPE.LONG_BLOB: 'TextField',
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FIELD_TYPE.VAR_STRING: 'CharField',
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}
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