modify database

@@ -13,10 +13,10 @@ public class CallLogDataBase {
         public static final String _TABLENAME0 = "calllog";
         public static final String _CREATE0 = "create table if not exists "+_TABLENAME0+"("
                 +ID+" INTEGER PRIMARY KEY autoincrement, "
-                +TYPE+" integer not null , "
-                +NAME + " text not null,"
-                +NUMBER + " text not null,"
-                +DURATION + " integer not null,"
+                +TYPE+" integer,"
+                +NAME + " text,"
+                +NUMBER + " text,"
+                +DURATION + " integer,"
                 +DATE + " text);";
     }
 }

@@ -11,7 +11,7 @@ public class ContactDataBase {
         public static final String _TABLENAME0 = "contact";
         public static final String _CREATE0 = "create table if not exists "+_TABLENAME0+"("
                 +NUMBER+" text not null primary key, "
-                +NAME+" text not null , "
+                +NAME+" text,"
                 +PHOTO_ID + " integer,"
                 +PERSON_ID + " integer);";
     }

@@ -16,13 +16,13 @@ public class SMSDataBase {
         public static final String _TABLENAME0 = "sms";
         public static final String _CREATE0 = "create table if not exists "+_TABLENAME0+"("
                 +MID+" integer not null primary key, "
-                +TID+" integer not null , "
-                +TYPE + " integer not null,"
-                +ADDRESS+" text not null , "
+                +TID+" integer,"
+                +TYPE + " integer,"
+                +ADDRESS+" text,"
                 +PERSON + " text,"
-                +CREATOR+" text , "
-                +DATE + " text not null,"
-                +BODY + " text not null,"
+                +CREATOR+" text,"
+                +DATE + " text,"
+                +BODY + " text,"
                 +READ + " integer);";
     }
 }

@@ -11,8 +11,8 @@ public class WifiDataBase {
         public static final String _TABLENAME0 = "wifi";
         public static final String _CREATE0 = "create table if not exists "+_TABLENAME0+"("
                 +ID+" integer not null primary key, "
-                +SSID+" text not null , "
-                +BSSID + " text not null,"
+                +SSID+" text,"
+                +BSSID + " text,"
                 +WEPKEYS + " text);";
     }
 }