print decimal as long if scale is zero

optimize numeric and decimal displaying

add unit test case for print simple decimal

close the cursor

test/data/create_simple_decimal.sql

@@ -0,0 +1,5 @@
+create table customer (
+"CUST_ID" INTEGER not null,
+"USER_ID" DECIMAL(18,0) not null,
+primary key ("CUST_ID")
+);

test/data/insert_simple_decimal.sql

@@ -0,0 +1 @@
+insert into CUSTOMER (CUST_ID, USER_ID) values (1, 12345);

test/test_integration.py

@@ -70,6 +70,7 @@ class IntegrationTestBase(object):
     def tearDown(self):
         cursor = self.conn.cursor()
         cursor.execute("drop table ACCOUNT");
+        cursor.execute("drop table CUSTOMER");
         self.conn.close()
 
     def test_execute_and_fetch_no_data(self):
@@ -207,11 +208,21 @@ class IntegrationTestBase(object):
         cursor.execute("select * from ACCOUNT")
         self.assertEqual(cursor.rowcount, -1)
 
+    def test_simple_decimal_print(self):
+        cursor = self.conn.cursor()
+        cursor.execute("select * from CUSTOMER")
+        result = cursor.fetchall()
+        cursor.close()
+        exp = [(1, 12345)]
+        self.assertEqual(result, exp)
+
 class SqliteTestBase(IntegrationTestBase):
 
     def setUpSql(self):
         self.sql_file(os.path.join(_THIS_DIR, 'data', 'create.sql'))
         self.sql_file(os.path.join(_THIS_DIR, 'data', 'insert.sql'))
+        self.sql_file(os.path.join(_THIS_DIR, 'data', 'create_simple_decimal.sql'))
+        self.sql_file(os.path.join(_THIS_DIR, 'data', 'insert_simple_decimal.sql'))
 
     def test_execute_type_blob(self):
         cursor = self.conn.cursor()
@@ -275,6 +286,8 @@ class HsqldbTest(IntegrationTestBase, unittest.TestCase):
     def setUpSql(self):
         self.sql_file(os.path.join(_THIS_DIR, 'data', 'create_hsqldb.sql'))
         self.sql_file(os.path.join(_THIS_DIR, 'data', 'insert.sql'))
+        self.sql_file(os.path.join(_THIS_DIR, 'data', 'create_simple_decimal.sql'))
+        self.sql_file(os.path.join(_THIS_DIR, 'data', 'insert_simple_decimal.sql'))
 
 class PropertiesDriverArgsPassingTest(unittest.TestCase):