minipg supportpr/143

2 files changed, 119 insertions, 1 deletions

diff --git a/lib/sqlalchemy/dialects/postgresql/__init__.py b/lib/sqlalchemy/dialects/postgresql/__init__.py
index 1cff8e3a0..aed82edce 100644
--- a/lib/sqlalchemy/dialects/postgresql/__init__.py
+++ b/lib/sqlalchemy/dialects/postgresql/__init__.py
@@ -5,7 +5,7 @@
 # This module is part of SQLAlchemy and is released under
 # the MIT License: http://www.opensource.org/licenses/mit-license.php
 
-from . import base, psycopg2, pg8000, pypostgresql, zxjdbc
+from . import base, psycopg2, pg8000, pypostgresql, zxjdbc, minipg
 
 base.dialect = psycopg2.dialect
 
diff --git a/lib/sqlalchemy/dialects/postgresql/minipg.py b/lib/sqlalchemy/dialects/postgresql/minipg.py
new file mode 100644
index 000000000..b3f184abf
--- /dev/null
+++ b/lib/sqlalchemy/dialects/postgresql/minipg.py
@@ -0,0 +1,118 @@
+# postgresql/minipg.py
+# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of SQLAlchemy and is released under
+# the MIT License: http://www.opensource.org/licenses/mit-license.php
+
+"""
+.. dialect:: postgresql+minipg
+    :name: minipg
+    :dbapi: minipg
+    :connectstring: postgresql+minipg://user:password@host:port/dbname\
+[?key=value&key=value...]
+    :url: https://github.com/nakagami/minipg
+
+
+"""
+import decimal
+from ... import util, exc
+from ... import types as sqltypes
+from .base import PGDialect, PGCompiler, \
+    PGExecutionContext, _DECIMAL_TYPES, _FLOAT_TYPES, _INT_TYPES
+from ... import processors
+
+class _PGNumeric(sqltypes.Numeric):
+    def bind_processor(self, dialect):
+        return None
+
+    def result_processor(self, dialect, coltype):
+        if self.asdecimal:
+            if coltype in _FLOAT_TYPES:
+                return processors.to_decimal_processor_factory(
+                    decimal.Decimal,
+                    self._effective_decimal_return_scale)
+            elif coltype in _DECIMAL_TYPES or coltype in _INT_TYPES:
+                # minipg returns Decimal natively for 1700
+                return None
+            else:
+                raise exc.InvalidRequestError(
+                    "Unknown PG numeric type: %d" % coltype)
+        else:
+            if coltype in _FLOAT_TYPES:
+                # minipg returns float natively for 701
+                return None
+            elif coltype in _DECIMAL_TYPES or coltype in _INT_TYPES:
+                return processors.to_float
+            else:
+                raise exc.InvalidRequestError(
+                    "Unknown PG numeric type: %d" % coltype)
+
+
+
+class PGCompiler_minipg(PGCompiler):
+    def visit_match_op_binary(self, binary, operator, **kw):
+        v = __import__('minipg').escape_parameter(binary.right)
+        return "%s=%s" % (self.process(binary.left, **kw), v)
+
+class PGDialect_minipg(PGDialect):
+    driver = 'minipg'
+
+    default_paramstyle = 'format'
+    supports_sane_multi_rowcount = True
+    supports_unicode_statements = True
+    supports_unicode_binds = True
+    description_encoding = 'use_encoding'
+    statement_compiler = PGCompiler_minipg
+
+    colspecs = util.update_copy(
+        PGDialect.colspecs,
+        {
+            sqltypes.Numeric: _PGNumeric,
+        }
+    )
+
+    @classmethod
+    def dbapi(cls):
+        return __import__('minipg')
+
+    def create_connect_args(self, url):
+        opts = url.translate_connect_args(username='user')
+        if 'port' in opts:
+            opts['port'] = int(opts['port'])
+        else:
+            opts['port'] = 5432
+        opts.update(url.query)
+        return ([], opts)
+
+    def is_disconnect(self, e, connection, cursor):
+        if not connection:
+            return False
+        return not connection.is_connect()
+
+    def set_isolation_level(self, connection, level):
+        level = level.replace('_', ' ')
+
+        # adjust for ConnectionFairy possibly being present
+        if hasattr(connection, 'connection'):
+            connection = connection.connection
+
+        if level == 'AUTOCOMMIT':
+            connection.autocommit = True
+        elif level in self._isolation_lookup:
+            connection.autocommit = False
+            cursor = connection.cursor()
+            cursor.execute(
+                "SET SESSION CHARACTERISTICS AS TRANSACTION "
+                "ISOLATION LEVEL %s" % level)
+            cursor.execute("COMMIT")
+            cursor.close()
+        else:
+            raise exc.ArgumentError(
+                "Invalid value '%s' for isolation_level. "
+                "Valid isolation levels for %s are %s or AUTOCOMMIT" %
+                (level, self.name, ", ".join(self._isolation_lookup))
+            )
+
+
+dialect = PGDialect_minipg