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boulder-oracle-sprint: Fixed Oracle limit-offset logic and many_to_one test
case. git-svn-id: http://code.djangoproject.com/svn/django/branches/boulder-oracle-sprint@4078 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Boulder Sprinters
parent
19773e0d70
commit
525f81d091
@ -69,17 +69,17 @@ class FormatStylePlaceholderCursor(Database.Cursor):
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Django uses "format" (e.g. '%s') style placeholders, but Oracle uses ":var" style.
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This fixes it -- but note that if you want to use a literal "%s" in a query,
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you'll need to use "%%s".
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"""
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"""
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def _rewrite_args(self, query, params=None):
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if params is None:
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if params is None:
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params = []
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args = [(':arg%d' % i) for i in range(len(params))]
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query = query % tuple(args)
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# cx_Oracle cannot execute a query with the closing ';'
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# cx_Oracle cannot execute a query with the closing ';'
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if query.endswith(';'):
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query = query[:-1]
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return query, params
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def execute(self, query, params=None):
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query, params = self._rewrite_args(query, params)
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self.arraysize = 200
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@ -90,9 +90,9 @@ class FormatStylePlaceholderCursor(Database.Cursor):
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self.arraysize = 200
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return Database.Cursor.executemany(self, query, params)
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def quote_name(name):
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# Oracle requires that quoted names be uppercase.
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# Oracle requires that quoted names be uppercase.
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name = name.upper()
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if not name.startswith('"') and not name.endswith('"'):
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name = '"%s"' % util.truncate_name(name.upper(), get_max_name_length())
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@ -143,15 +143,15 @@ def get_max_name_length():
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OPERATOR_MAPPING = {
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'exact': '= %s',
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'iexact': 'LIKE %s',
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'contains': 'LIKE %s',
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'icontains': 'LIKE %s',
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'iexact': "LIKE %s ESCAPE '\\'",
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'contains': "LIKE %s ESCAPE '\\'",
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'icontains': "LIKE %s ESCAPE '\\'",
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'gt': '> %s',
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'gte': '>= %s',
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'lt': '< %s',
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'lte': '<= %s',
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'startswith': 'LIKE %s',
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'endswith': 'LIKE %s',
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'istartswith': 'LIKE %s',
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'iendswith': 'LIKE %s',
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'startswith': "LIKE %s ESCAPE '\\'",
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'endswith': "LIKE %s ESCAPE '\\'",
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'istartswith': "LIKE %s ESCAPE '\\'",
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'iendswith': "LIKE %s ESCAPE '\\'",
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}
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@ -45,7 +45,7 @@ def create_test_db(settings, connection, backend, verbosity=1, autoclobber=False
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cursor = connection.cursor()
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try:
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_create_test_db(cursor, TEST_DATABASE_NAME, verbosity)
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except Exception, e:
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except Exception, e:
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sys.stderr.write("Got an error creating the test database: %s\n" % e)
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if not autoclobber:
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confirm = raw_input("It appears the test database, %s, already exists. Type 'yes' to delete it, or 'no' to cancel: " % TEST_DATABASE_NAME)
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@ -63,7 +63,7 @@ def create_test_db(settings, connection, backend, verbosity=1, autoclobber=False
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else:
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print "Tests cancelled."
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sys.exit(1)
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connection.close()
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settings.DATABASE_USER = TEST_DATABASE_NAME
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settings.DATABASE_PASSWORD = PASSWORD
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@ -71,7 +71,7 @@ def create_test_db(settings, connection, backend, verbosity=1, autoclobber=False
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# Get a cursor (even though we don't need one yet). This has
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# the side effect of initializing the test database.
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cursor = connection.cursor()
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def destroy_test_db(settings, connection, backend, old_database_name, verbosity=1):
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if verbosity >= 1:
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print "Destroying test database..."
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@ -105,7 +105,7 @@ def _create_test_db(cursor, dbname, verbosity):
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"""GRANT CONNECT, RESOURCE TO %(user)s""",
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]
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_execute_statements(cursor, statements, dbname, verbosity)
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def _destroy_test_db(cursor, dbname, verbosity):
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if verbosity >= 2:
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print "_destroy_test_db(): dbname=%s" % dbname
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@ -22,7 +22,7 @@ def fill_table_cache(opts, select, tables, where, old_prefix, cache_tables_seen)
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Helper function that recursively populates the select, tables and where (in
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place) for select_related queries.
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"""
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from django.db.models.fields import AutoField
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from django.db.models.fields import AutoField
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qn = backend.quote_name
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for f in opts.fields:
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if f.rel and not f.null:
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@ -36,15 +36,15 @@ def fill_table_cache(opts, select, tables, where, old_prefix, cache_tables_seen)
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cache_tables_seen.append(db_table)
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where.append('%s.%s = %s.%s' % \
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(qn(old_prefix), qn(f.column), qn(db_table), qn(f.rel.get_related_field().column)))
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select.extend(['%s.%s' % (backend.quote_name(db_table), backend.quote_name(f2.column)) for f2 in f.rel.to._meta.fields if not isinstance(f2, AutoField)])
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select.extend(['%s.%s' % (backend.quote_name(db_table), backend.quote_name(f2.column)) for f2 in f.rel.to._meta.fields if not isinstance(f2, AutoField)])
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fill_table_cache(f.rel.to._meta, select, tables, where, db_table, cache_tables_seen)
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def get_query_set_class(DefaultQuerySet):
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"Create a custom QuerySet class for Oracle."
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class OracleQuerySet(DefaultQuerySet):
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def iterator(self):
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"Performs the SELECT database lookup of this QuerySet."
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@ -53,14 +53,15 @@ def get_query_set_class(DefaultQuerySet):
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extra_select = self._select.items()
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full_query = None
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select, sql, params, full_query = self._get_sql_clause()
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if not full_query:
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full_query = "SELECT %s%s\n%s" % \
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((self._distinct and "DISTINCT " or ""),
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', '.join(select), sql)
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cursor = connection.cursor()
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cursor.execute(full_query, params)
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cursor.execute(full_query, params)
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fill_cache = self._select_related
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index_end = len(self.model._meta.fields)
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@ -88,44 +89,44 @@ def get_query_set_class(DefaultQuerySet):
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def _get_sql_clause(self):
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opts = self.model._meta
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# Construct the fundamental parts of the query: SELECT X FROM Y WHERE Z.
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select = ["%s.%s" % (backend.quote_name(opts.db_table), backend.quote_name(f.column)) for f in opts.fields]
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tables = [quote_only_if_word(t) for t in self._tables]
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joins = SortedDict()
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where = self._where[:]
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params = self._params[:]
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# Convert self._filters into SQL.
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joins2, where2, params2 = self._filters.get_sql(opts)
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joins.update(joins2)
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where.extend(where2)
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params.extend(params2)
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# Add additional tables and WHERE clauses based on select_related.
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if self._select_related:
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fill_table_cache(opts, select, tables, where, opts.db_table, [opts.db_table])
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# Add any additional SELECTs.
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if self._select:
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select.extend(['(%s) AS %s' % (quote_only_if_word(s[1]), backend.quote_name(s[0])) for s in self._select.items()])
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# Start composing the body of the SQL statement.
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sql = [" FROM", backend.quote_name(opts.db_table)]
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# Compose the join dictionary into SQL describing the joins.
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if joins:
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sql.append(" ".join(["%s %s %s ON %s" % (join_type, table, alias, condition)
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for (alias, (table, join_type, condition)) in joins.items()]))
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# Compose the tables clause into SQL.
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if tables:
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sql.append(", " + ", ".join(tables))
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# Compose the where clause into SQL.
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if where:
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sql.append(where and "WHERE " + " AND ".join(where))
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# ORDER BY clause
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order_by = []
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if self._order_by is not None:
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@ -155,41 +156,51 @@ def get_query_set_class(DefaultQuerySet):
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order_by.append('%s%s %s' % (table_prefix, backend.quote_name(orderfield2column(col_name, opts)), order))
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if order_by:
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sql.append("ORDER BY " + ", ".join(order_by))
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# LIMIT and OFFSET clauses
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# To support limits and offsets, Oracle requires some funky rewriting of an otherwise normal looking query.
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select_clause = ",".join(select)
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distinct = (self._distinct and "DISTINCT " or "")
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# To support limits and offsets, Oracle requires some funky rewriting of an otherwise normal looking query.
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select_clause = ",".join(select)
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distinct = (self._distinct and "DISTINCT " or "")
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if order_by:
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order_by_clause = " OVER (ORDER BY %s )" % (", ".join(order_by))
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if order_by:
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order_by_clause = " OVER (ORDER BY %s )" % (", ".join(order_by))
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else:
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#Oracle's row_number() function always requires an order-by clause.
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#So we need to define a default order-by, since none was provided.
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#Oracle's row_number() function always requires an order-by clause.
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#So we need to define a default order-by, since none was provided.
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order_by_clause = " OVER (ORDER BY %s.%s)" % \
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(backend.quote_name(opts.db_table),
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backend.quote_name(opts.fields[0].db_column or opts.fields[0].column))
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# limit_and_offset_clause
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offset = self._offset and int(self._offset) or 0
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limit = self._limit and int(self._limit) or None
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limit_and_offset_clause = ''
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if limit:
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limit_and_offset_clause = "WHERE rn > %s AND rn <= %s" % (offset, limit+offset)
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elif offset:
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limit_and_offset_clause = "WHERE rn > %s" % (offset)
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(backend.quote_name(opts.db_table),
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backend.quote_name(opts.fields[0].db_column or opts.fields[0].column))
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# limit_and_offset_clause
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if self._limit is None:
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assert self._offset is None, "'offset' is not allowed without 'limit'"
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if len(limit_and_offset_clause) > 0:
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full_query = """SELECT * FROM
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(SELECT %s
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%s,
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ROW_NUMBER() %s AS rn
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%s
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)
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%s
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if self._offset is not None:
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offset = int(self._offset)
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else:
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offset = 0
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if self._limit is not None:
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limit = int(self._limit)
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else:
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limit = None
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limit_and_offset_clause = ''
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if limit is not None:
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limit_and_offset_clause = "WHERE rn > %s AND rn <= %s" % (offset, limit+offset)
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elif offset:
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limit_and_offset_clause = "WHERE rn > %s" % (offset)
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if len(limit_and_offset_clause) > 0:
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full_query = """SELECT * FROM
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(SELECT %s
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%s,
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ROW_NUMBER() %s AS rn
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%s
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)
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%s
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""" % (distinct, select_clause, order_by_clause, " ".join(sql), limit_and_offset_clause)
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else:
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full_query = None
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full_query = None
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return select, " ".join(sql), params, full_query
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return OracleQuerySet
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@ -169,9 +169,9 @@ class _QuerySet(object):
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extra_select = self._select.items()
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cursor = connection.cursor()
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select, sql, params, full_query = self._get_sql_clause()
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cursor.execute("SELECT " + (self._distinct and "DISTINCT " or "") + ",".join(select) + sql, params)
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select, sql, params, full_query = self._get_sql_clause()
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cursor.execute("SELECT " + (self._distinct and "DISTINCT " or "") + ",".join(select) + sql, params)
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fill_cache = self._select_related
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index_end = len(self.model._meta.fields)
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@ -518,7 +518,7 @@ if hasattr(backend_query_module, "get_query_set_class"):
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QuerySet = db.get_query_module().get_query_set_class(_QuerySet)
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else:
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QuerySet = _QuerySet
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class ValuesQuerySet(QuerySet):
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def iterator(self):
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# select_related and select aren't supported in values().
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@ -567,7 +567,7 @@ class DateQuerySet(QuerySet):
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sql = fmt % (date_trunc_sql, sql, date_trunc_sql, self._order)
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cursor = connection.cursor()
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cursor.execute(sql, params)
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return [row[0] for row in cursor.fetchall()]
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return [row[0] for row in cursor.fetchall()]
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else:
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sql = fmt % (date_trunc_sql, sql, 1, self._order_by)
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cursor = connection.cursor()
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@ -660,10 +660,10 @@ def get_where_clause(lookup_type, table_prefix, field_name, value):
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# TODO: move this into django.db.backends.oracle somehow
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if settings.DATABASE_ENGINE == 'oracle':
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if lookup_type == 'icontains':
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return 'lower(%s%s) %s' % (table_prefix, field_name, (backend.OPERATOR_MAPPING[lookup_type] % '%s'))
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return 'lower(%s%s) %s' % (table_prefix, field_name, (backend.OPERATOR_MAPPING[lookup_type] % '%s'))
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elif type(value) == datetime.datetime:
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return "%s%s %s" % (table_prefix, field_name,
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(backend.OPERATOR_MAPPING[lookup_type] % "TO_TIMESTAMP(%s, 'YYYY-MM-DD HH24:MI:SS')"))
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(backend.OPERATOR_MAPPING[lookup_type] % "TO_TIMESTAMP(%s, 'YYYY-MM-DD HH24:MI:SS')"))
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try:
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return '%s%s %s' % (table_prefix, field_name, (backend.OPERATOR_MAPPING[lookup_type] % '%s'))
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except KeyError:
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@ -695,7 +695,7 @@ def fill_table_cache(opts, select, tables, where, old_prefix, cache_tables_seen)
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Helper function that recursively populates the select, tables and where (in
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place) for select_related queries.
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"""
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from django.db.models.fields import AutoField
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from django.db.models.fields import AutoField
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qn = backend.quote_name
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for f in opts.fields:
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if f.rel and not f.null:
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@ -709,7 +709,7 @@ def fill_table_cache(opts, select, tables, where, old_prefix, cache_tables_seen)
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cache_tables_seen.append(db_table)
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where.append('%s.%s = %s.%s' % \
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(qn(old_prefix), qn(f.column), qn(db_table), qn(f.rel.get_related_field().column)))
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select.extend(['%s.%s' % (backend.quote_name(db_table), backend.quote_name(f2.column)) for f2 in f.rel.to._meta.fields])
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select.extend(['%s.%s' % (backend.quote_name(db_table), backend.quote_name(f2.column)) for f2 in f.rel.to._meta.fields])
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fill_table_cache(f.rel.to._meta, select, tables, where, db_table, cache_tables_seen)
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def parse_lookup(kwarg_items, opts):
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@ -754,7 +754,7 @@ def parse_lookup(kwarg_items, opts):
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if len(path) < 1:
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raise TypeError, "Cannot parse keyword query %r" % kwarg
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if value is None:
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# Interpret '__exact=None' as the sql '= NULL'; otherwise, reject
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# all uses of None as a query value.
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@ -146,7 +146,7 @@ False
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# The underlying query only makes one join when a related table is referenced twice.
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>>> query = Article.objects.filter(reporter__first_name__exact='John', reporter__last_name__exact='Smith')
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>>> null, sql, null = query._get_sql_clause()
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>>> null, sql, null, null = query._get_sql_clause()
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>>> sql.count('INNER JOIN')
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1
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@ -155,7 +155,7 @@ False
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[<Article: John's second story>, <Article: This is a test>]
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# Find all Articles for the Reporter whose ID is 1.
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# Use direct ID check, pk check, and object comparison
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# Use direct ID check, pk check, and object comparison
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>>> Article.objects.filter(reporter__id__exact=1)
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[<Article: John's second story>, <Article: This is a test>]
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>>> Article.objects.filter(reporter__pk=1)
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