Fixed #1673 -- Every database backend now raises ImproperlyConfigured if the relevant Python database module raises ImportError

git-svn-id: http://code.djangoproject.com/svn/django/trunk@2993 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/ado_mssql/base.py

@@ -5,7 +5,11 @@ Requires adodbapi 2.0.1: http://adodbapi.sourceforge.net/
 """
 
 from django.db.backends import util
+try:
     import adodbapi as Database
+except ImportError, e:
+    from django.core.exceptions import ImproperlyConfigured
+    raise ImproperlyConfigured, "Error loading adodbapi module: %s" % e
 import datetime
 try:
     import mx

django/db/backends/mysql/base.py

@@ -5,7 +5,11 @@ Requires MySQLdb: http://sourceforge.net/projects/mysql-python
 """
 
 from django.db.backends import util
+try:
     import MySQLdb as Database
+except ImportError, e:
+    from django.core.exceptions import ImproperlyConfigured
+    raise ImproperlyConfigured, "Error loading MySQLdb module: %s" % e
 from MySQLdb.converters import conversions
 from MySQLdb.constants import FIELD_TYPE
 import types

django/db/backends/oracle/base.py

@@ -5,7 +5,11 @@ Requires cx_Oracle: http://www.python.net/crew/atuining/cx_Oracle/
 """
 
 from django.db.backends import util
+try:
     import cx_Oracle as Database
+except ImportError, e:
+    from django.core.exceptions import ImproperlyConfigured
+    raise ImproperlyConfigured, "Error loading cx_Oracle module: %s" % e
 import types
 
 DatabaseError = Database.Error

django/db/backends/postgresql/base.py

@@ -5,7 +5,11 @@ Requires psycopg 1: http://initd.org/projects/psycopg1
 """
 
 from django.db.backends import util
+try:
     import psycopg as Database
+except ImportError, e:
+    from django.core.exceptions import ImproperlyConfigured
+    raise ImproperlyConfigured, "Error loading psycopg module: %s" % e
 
 DatabaseError = Database.DatabaseError
 

django/db/backends/postgresql_psycopg2/base.py

@@ -5,7 +5,11 @@ Requires psycopg 2: http://initd.org/projects/psycopg2
 """
 
 from django.db.backends import util
+try:
     import psycopg2 as Database
+except ImportError, e:
+    from django.core.exceptions import ImproperlyConfigured
+    raise ImproperlyConfigured, "Error loading psycopg2 module: %s" % e
 
 DatabaseError = Database.DatabaseError
 

django/db/backends/sqlite3/base.py

@@ -3,7 +3,11 @@ SQLite3 backend for django.  Requires pysqlite2 (http://pysqlite.org/).
 """
 
 from django.db.backends import util
+try:
     from pysqlite2 import dbapi2 as Database
+except ImportError, e:
+    from django.core.exceptions import ImproperlyConfigured
+    raise ImproperlyConfigured, "Error loading pysqlite2 module: %s" % e
 
 DatabaseError = Database.DatabaseError