Question

In My database I want to retrieve a row from my database . For this I write a query :

Cursor mCursor = db.query("Author_table", column_name, "Author_name=?" , params, null , null , null) ;

By this I want to do the following query : “Select AID from Author_table where Author_name = Sultan” . But I have got anexception in SQLiteDatabase in android . Please suggest me what to do ??

Answer 1

Something like this should work:

Cursor c = db.query("Author_table", new String[] {"AID"}, "Author_name=?", new String[] {"Sultan"}, null, null, null);

EDIT

SQLOpenHelper

import java.io.File;

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Environment;

public class OpenHelper extends SQLiteOpenHelper {

    private static final String DATABASE_NAME = "test.db";
    private static final int DATABASE_VERSION = 8;

    private static final String CREATE_TABLE_USER = "create table USER( "
            + "username varchar(256) not null, " + "sex varchar(1) not null, "
            + "password varchar(64) not null, " + "active int not null"
            + ");";

    public OpenHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_TABLE_USER);
    }

    @Override
    public void onOpen(SQLiteDatabase db) {
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        if (oldVersion < 8) {
            // db update goes here and in onCreate() (for newly installed apps)
        }
    }

}