RuntimeError while retriving data from sqlite database in android

Question

I\'m trying to insert and retrieve data from database in eclipse using sqlite, but it shows a RuntimeError. I create a layout with three edit texts and one button t

Answer 1

You need init ctxx in onCreate() method:

ctxx = this;

If you want to know more about sqlite on android -> ok. But if you want to less code you can try some SqliteLibrary for android. (example ActiveAndroid, GreenDAO.....).

Answer 2

In your activity initialize the ctxx in onCreate:

ctxx=this;

or

DBHelper DB=new DBHelper(MainActivity.this);

whenever you will initialize database object will null you will get sqlite locked exception.

Answer 3

Also fixe this

public void onCreate(SQLiteDatabase db) {
        data=db;
        db.execSQL("CREATE TABLE " + TABLE_NAME + " ("
                + NAME + " TEXT,"
                + FATHER_NAME + " TEXT,"
                + MOTHER_NAME + " TEXT"
                + ");");
        Log.d("DATABASE OPERATION", "TABLE CREATED");


    }

for "INTEGER," remove ,.

and intialise it like this DBHelper.

DBHelper DB=new DBHelper(MainActivity.this);

Answer 4

ctxx is never initialzed, and this probably the cause of the crash. Generally speaking, when you deal with Activity and Fragment subclass, you almost never need to keep a reference to the Context. Activity is a subclass of Context, and usually this is enough. In a Fragment you can retrieve the context of the Activity hosting the Fragment with getActivity()

Chante

 DBHelper DB=new DBHelper(ctxx);

with

DBHelper DB=new DBHelper(MainActivity.this);

As @DerGolem pointed out, you are using the type INTEGER for the column MOTHER_NAME. Probably you want to use TEXT, instead, and you will also need a the primary key "_id"

  db.execSQL("CREATE TABLE " + TABLE_NAME + " ("
                + BaseColumns._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
                + NAME + " TEXT,"
                + FATHER_NAME + " TEXT,"
                + MOTHER_NAME + " TEXT"
                + ");");