polish db-api to support Python2 so can run on PAI

Author: lhw362950217

python/runtime/dbapi/connection.py

@@ -12,9 +12,9 @@
 # limitations under the License
 
 from abc import ABCMeta, abstractmethod
-from urllib.parse import parse_qs, urlparse
 
 import six
+from six.moves.urllib.parse import parse_qs, urlparse
 
 
 @six.add_metaclass(ABCMeta)
@@ -102,6 +102,11 @@ def __init__(self, conn_uri):
             if len(l) == 1:
                 self.params[k] = l[0]
 
+    def param(self, param_name, default_value=""):
+        if not self.params:
+            return default_value
+        return self.params.get(param_name, default_value)
+
     def _parse_uri(self):
         """Parse the connection string into URI parts
         Returns:
@@ -139,7 +144,7 @@ def query(self, statement):
         """
         return self._get_result_set(statement)
 
-    def exec(self, statement):
+    def execute(self, statement):
         """Execute given statement and return True on success
 
         Args:

python/runtime/dbapi/hive.py

@@ -11,13 +11,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License
 
-from impala.dbapi import connect
+try:
+    from impala.dbapi import connect
+except:
+    pass
 from runtime.dbapi.connection import Connection, ResultSet
 
 
 class HiveResultSet(ResultSet):
     def __init__(self, cursor, err=None):
-        super().__init__()
+        super(HiveResultSet, self).__init__()
         self._cursor = cursor
         self._column_info = None
         self._err = err
@@ -33,7 +36,7 @@ def column_info(self):
         """
 
         if self._column_info is not None:
-            return self.column_info
+            return self._column_info
 
         columns = []
         for desc in self._cursor.description:
@@ -66,7 +69,7 @@ class HiveConnection(Connection):
         configuration
     """
     def __init__(self, conn_uri):
-        super().__init__(conn_uri)
+        super(HiveConnection, self).__init__(conn_uri)
         self.driver = "hive"
         self.params["database"] = self.uripts.path.strip("/")
         self._conn = connect(user=self.uripts.username,
@@ -87,6 +90,16 @@ def _get_result_set(self, statement):
             cursor.close()
             return HiveResultSet(None, str(e))
 
+    def cursor(self):
+        """Get a cursor on the connection
+        We insist not to use the low level api like cursor.
+        Instead, we can directly use query/exec
+        """
+        return self._conn.cursor()
+
+    def commit(self):
+        return self._conn.commit()
+
     def close(self):
         if self._conn:
             self._conn.close()

python/runtime/dbapi/hive_test.py

@@ -51,15 +51,15 @@ def test_query(self):
 
     def test_exec(self):
         conn = HiveConnection(testing.get_datasource())
-        rs = conn.exec("create table test_exec(a int)")
+        rs = conn.execute("create table test_exec(a int)")
         self.assertTrue(rs)
-        rs = conn.exec("insert into test_exec values(1), (2)")
+        rs = conn.execute("insert into test_exec values(1), (2)")
         self.assertTrue(rs)
         rs = conn.query("select * from test_exec")
         self.assertTrue(rs.success())
         rows = [r for r in rs]
         self.assertTrue(2, len(rows))
-        rs = conn.exec("drop table test_exec")
+        rs = conn.execute("drop table test_exec")
         self.assertTrue(rs)
 
     def test_get_table_schema(self):

python/runtime/dbapi/maxcompute.py

@@ -13,12 +13,15 @@
 
 from odps import ODPS, tunnel
 from runtime.dbapi.connection import Connection, ResultSet
+from six.moves.urllib.parse import parse_qs, urlparse
+
+COMPRESS_ODPS_ZLIB = tunnel.CompressOption.CompressAlgorithm.ODPS_ZLIB
 
 
 class MaxComputeResultSet(ResultSet):
     """MaxCompute query result"""
     def __init__(self, instance, err=None):
-        super().__init__()
+        super(MaxComputeResultSet, self).__init__()
         self._instance = instance
         self._column_info = None
         self._err = err
@@ -40,18 +43,17 @@ def column_info(self):
             A list of column metas, like [(field_a, INT), (field_b, STRING)]
         """
         if self._column_info is not None:
-            return self.column_info
+            return self._column_info
 
         r = self._open_reader()
-        self._column_info = [(col.name, str.upper(col.type))
+        self._column_info = [(col.name, str(col.type).upper())
                              for col in r._schema.columns]
         return self._column_info
 
     def _open_reader(self):
         if not self._reader:
-            compress = tunnel.CompressOption.CompressAlgorithm.ODPS_ZLIB
-            self._reader = self._instance.open_reader(tunnel=True,
-                                                      compress_option=compress)
+            self._reader = self._instance.open_reader(
+                tunnel=True, compress_option=COMPRESS_ODPS_ZLIB)
         return self._reader
 
     def success(self):
@@ -81,18 +83,33 @@ class MaxComputeConnection(Connection):
         maxcompute://access_id:access_key@service.com/api?curr_project=test_ci&scheme=http
     """
     def __init__(self, conn_uri):
-        super().__init__(conn_uri)
+        super(MaxComputeConnection, self).__init__(conn_uri)
+        user, pwd, endpoint, proj = MaxComputeConnection.get_uri_parts(
+            conn_uri)
         self.driver = "maxcompute"
-        self.params["database"] = self.params["curr_project"]
+        self.params["database"] = proj
+        self.endpoint = endpoint
+        self._conn = ODPS(user, pwd, project=proj, endpoint=endpoint)
+
+    @staticmethod
+    def get_uri_parts(uri):
+        """Get username, password, endpoint, projectfrom given uri
+
+        Args:
+            uri: a vliad maxcompute connection uri
+
+        Returns:
+            A tuple (username, password, endpoint, project)
+        """
+        uripts = urlparse(uri)
+        params = parse_qs(uripts.query)
         # compose an endpoint, only keep the host and path and replace scheme
-        endpoint = self.uripts._replace(scheme=self.params["scheme"],
-                                        query="",
-                                        netloc=self.uripts.hostname)
-        self.endpoint = endpoint.geturl()
-        self._conn = ODPS(self.uripts.username,
-                          self.uripts.password,
-                          project=self.params["database"],
-                          endpoint=self.endpoint)
+        endpoint = uripts._replace(scheme=params.get("scheme", ["http"])[0],
+                                   query="",
+                                   netloc=uripts.hostname)
+        endpoint = endpoint.geturl()
+        return (uripts.username, uripts.password, endpoint,
+                params.get("curr_project", [""])[0])
 
     def _get_result_set(self, statement):
         try:
@@ -108,3 +125,19 @@ def close(self):
     def get_table_schema(self, table_name):
         schema = self._conn.get_table(table_name).schema
         return [(c.name, str(c.type).upper()) for c in schema.columns]
+
+    def write_table(self,
+                    table_name,
+                    rows,
+                    compress_option=COMPRESS_ODPS_ZLIB):
+        """Append rows to given table, this is a driver specific api
+
+        Args:
+            table_name: the table to write
+            rows: list of rows, each row is a data tuple, like [(1,True,"ok"),(2,False,"bad")]
+            compress_options: the compress options defined in 
+                tunnel.CompressOption.CompressAlgorithm
+        """
+        self._conn.write_table(table_name,
+                               rows,
+                               compress_option=compress_option)

python/runtime/dbapi/maxcompute_test.py

@@ -56,17 +56,17 @@ def test_query(self):
 
     def test_exec(self):
         conn = MaxComputeConnection(testing.get_datasource())
-        rs = conn.exec(
+        rs = conn.execute(
             "create table alifin_jtest_dev.sqlflow_test_exec(a int)")
         self.assertTrue(rs)
-        rs = conn.exec(
+        rs = conn.execute(
             "insert into alifin_jtest_dev.sqlflow_test_exec values(1), (2)")
         self.assertTrue(rs)
         rs = conn.query("select * from alifin_jtest_dev.sqlflow_test_exec")
         self.assertTrue(rs.success())
         rows = [r for r in rs]
         self.assertTrue(2, len(rows))
-        rs = conn.exec("drop table alifin_jtest_dev.sqlflow_test_exec")
+        rs = conn.execute("drop table alifin_jtest_dev.sqlflow_test_exec")
         self.assertTrue(rs)
 
     def test_get_table_schema(self):

python/runtime/dbapi/mysql.py

@@ -12,12 +12,16 @@
 # limitations under the License
 
 import re
-from urllib.parse import ParseResult
+
+from runtime.dbapi.connection import Connection, ResultSet
+from six.moves.urllib.parse import ParseResult
 
 # NOTE: use MySQLdb to avoid bugs like infinite reading:
 # https://bugs.mysql.com/bug.php?id=91971
-from MySQLdb import connect
-from runtime.dbapi.connection import Connection, ResultSet
+try:
+    from MySQLdb import connect
+except:
+    pass
 
 try:
     import MySQLdb.constants.FIELD_TYPE as MYSQL_FIELD_TYPE
@@ -40,7 +44,7 @@
 
 class MySQLResultSet(ResultSet):
     def __init__(self, cursor, err=None):
-        super().__init__()
+        super(MySQLResultSet, self).__init__()
         self._cursor = cursor
         self._column_info = None
         self._err = err
@@ -55,10 +59,10 @@ def column_info(self):
             A list of column metas, like [(field_a, INT), (field_b, STRING)]
         """
         if self._column_info is not None:
-            return self.column_info
+            return self._column_info
 
         columns = []
-        for desc in self._cursor.description:
+        for desc in self._cursor.description or []:
             # NOTE: MySQL returns an integer number instead of a string
             # to represent the data type.
             typ = MYSQL_FIELD_TYPE_DICT.get(desc[1])
@@ -88,7 +92,7 @@ def close(self):
 
 class MySQLConnection(Connection):
     def __init__(self, conn_uri):
-        super().__init__(conn_uri)
+        super(MySQLConnection, self).__init__(conn_uri)
         self.driver = "mysql"
         self.params["database"] = self.uripts.path.strip("/")
         self._conn = connect(user=self.uripts.username,
@@ -115,6 +119,16 @@ def _get_result_set(self, statement):
             cursor.close()
             return MySQLResultSet(None, str(e))
 
+    def cursor(self):
+        """Get a cursor on the connection
+        We insist not to use the low level api like cursor.
+        Instead, we can directly use query/exec
+        """
+        return self._conn.cursor()
+
+    def commit(self):
+        return self._conn.commit()
+
     def close(self):
         if self._conn:
             self._conn.close()

python/runtime/dbapi/mysql_test.py

@@ -50,17 +50,17 @@ def test_query(self):
 
     def test_exec(self):
         conn = MySQLConnection(testing.get_datasource())
-        rs = conn.exec("create table test_exec(a int)")
+        rs = conn.execute("create table test_exec(a int)")
         self.assertTrue(rs)
-        rs = conn.exec("insert into test_exec values(1), (2)")
+        rs = conn.execute("insert into test_exec values(1), (2)")
         self.assertTrue(rs)
         rs = conn.query("select * from test_exec")
         self.assertTrue(rs.success())
         rows = [r for r in rs]
         self.assertTrue(2, len(rows))
-        rs = conn.exec("drop table test_exec")
+        rs = conn.execute("drop table test_exec")
         self.assertTrue(rs)
-        rs = conn.exec("drop table not_exist")
+        rs = conn.execute("drop table not_exist")
         self.assertFalse(rs)
 
     def test_get_table_schema(self):

python/runtime/dbapi/paiio.py

@@ -11,6 +11,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License
 
+from __future__ import absolute_import
+
 import re
 
 from runtime.dbapi.connection import Connection, ResultSet
@@ -23,7 +25,7 @@
 
 class PaiIOResultSet(ResultSet):
     def __init__(self, reader, err=None):
-        super().__init__()
+        super(PaiIOResultSet, self).__init__()
         self._reader = reader
         self._column_info = None
         self._err = err
@@ -41,10 +43,10 @@ def column_info(self):
             A list of column metas, like [(field_a, INT), (field_b, STRING)]
         """
         if self._column_info is not None:
-            return self.column_info
+            return self._column_info
 
         schema = self._reader.get_schema()
-        columns = [(c['colname'], str.upper(c['typestr'])) for c in schema]
+        columns = [(c['colname'], str(c['typestr']).upper()) for c in schema]
         self._column_info = columns
         return self._column_info
 
@@ -72,24 +74,26 @@ class PaiIOConnection(Connection):
     """PaiIOConnection emulate a connection for paiio,
     currently only support full-table reading. That means
     we can't filter the data, join the table and so on.
-    The only supported query statement is `None`.
+    The only supported query statement is `None`. The scheme
+    part of the uri can be 'paiio' or 'odps'
 
     Typical use is:
     con = PaiIOConnection("paiio://db/tables/my_table")
     res = con.query(None)
     rows = [r for r in res]
     """
     def __init__(self, conn_uri):
-        super().__init__(conn_uri)
+        super(PaiIOConnection, self).__init__(conn_uri)
+        # (TODO: lhw) change driver to paiio
         self.driver = "pai_maxcompute"
-        match = re.findall(r"paiio://\w+/tables/(.+)", self.uripts.path)
+        match = re.findall(r"\w+://\w+/tables/(.+)", conn_uri)
         if len(match) < 1:
             raise ValueError("Should specify table in uri with format: "
                              "paiio://db/tables/table?param_a=a&param_b=b")
-        self.params["database"] = self.uripts.hostname
-        self.params["table"] = match[0]
+        self.params["table"] = conn_uri.replace("paiio://", "odps://")
         self.params["slice_id"] = self.params.get("slice_id", 0)
         self.params["slice_count"] = self.params.get("slice_count", 1)
+        print(self.params)
 
     def _get_result_set(self, statement):
         if statement is not None:
@@ -101,6 +105,7 @@ def _get_result_set(self, statement):
                                        slice_count=self.params["slice_count"])
             return PaiIOResultSet(reader, None)
         except Exception as e:
+            print(e.args)
             return PaiIOResultSet(None, str(e))
 
     def get_table_schema(self, full_uri):
@@ -110,7 +115,7 @@ def get_table_schema(self, full_uri):
         return PaiIOConnection.get_schema(full_uri)
 
     def query(self, statement=None):
-        return super().query(statement)
+        return super(PaiIOConnection, self).query(statement)
 
     @staticmethod
     def get_table_row_num(table_uri):