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Errors in my SQLite Database for Android


Errors in my SQLite Database for Android

By : Fernando
Date : November 22 2020, 10:48 AM
seems to work fine I am having multiple issues with my SQLite Database with Android. I am new to developing and learning on my own. SO please use laymens terms and assume i do not know what you are talking about lol. Specifically i am having trouble wit the methods: , Try this :
code :
public Cursor getLast() {
    SMS txt = new SMS();
    String query = "SELECT * FROM mainTable";
    Cursor c = db.rawQuery(query, null);
    if(c != null && c.getCount() > 1)
       return c.moveToLast();
    return null;
}

public void deleteLast() {
    String query = "SELECT KEY_ID from mainTable order by KEY_ID DESC limit 1";
    long lastId = -1;
    Cursor c = db.rawQuery(query, null);
    if (c != null && c.moveToFirst()) {
        lastId = c.getLong(0);
    }

    if(lastId != -1)
      db.delete(DATABASE_TABLE, KEY_ID + "=" + lastId, null);
}


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Dealing with sqlite 'database is locked' errors in Android

Dealing with sqlite 'database is locked' errors in Android


By : user3062854
Date : March 29 2020, 07:55 AM
like below fixes the issue I have ended up having a single instance of my DbHelper (SQLiteOpenHelper) tied to my Application. By making all calls through this I never have any concurrency issues.
Android:Sqlite database errors

Android:Sqlite database errors


By : Marcin Sołtysiak
Date : March 29 2020, 07:55 AM
will help you I am writing code for a database to fetch data in an activity which contains three fields, namely Truck_id, employee_id, and password. , From you log i see
code :
Caused by: java.lang.NullPointerException 
06-14 19:12:06.723: E/AndroidRuntime(5930): at com.tanzanite.operasoft.database.DataBaseHelper.fetchdata(DataBaseHelper.java:224) 
06-14 19:12:06.723: E/AndroidRuntime(5930): at com.tanzanite.operasoft.activity.Sw_LoginScreenActivity.onCreate(Sw_LoginScreenActivity.java:49)
public Cursor fetchdata()
{
    open();
    Cursor c=myDataBase.query(TABLE_NAME,
         new String[]{COLUMN_NAME,
            COLUMN_TRUCKID,

                      },null, null, null, null, null);
    c.moveToLast();
    myDataBase.close();
    return c;
}
public DataBaseHelper open() throws SQLException
{   
        //myDataBase = dbHelper.getWritableDatabase();
        return this;
}
Android database errors using SQLite

Android database errors using SQLite


By : Alexander Davidsen
Date : March 29 2020, 07:55 AM
I wish did fix the issue. There are a couple of syntax errors in your SQLite query. Change this line:
code :
db.execSQL("create table " + TABLE_NAME + "(" + ID + "integer primary key autoincrement not null" + BOOK + " text " + ");");
db.execSQL("create table " + TABLE_NAME + "(" + ID + " integer primary key autoincrement not null, " + BOOK + " text " + ");");
Android errors when using code from stackoverflow to implement sqlite database

Android errors when using code from stackoverflow to implement sqlite database


By : mrrtree
Date : March 29 2020, 07:55 AM
will be helpful for those in need I get this error: class "DataBaseHelper" must either be abstract or implement abstract method. , You need to implement the abstract methods onUpgrade and onCreate:
code :
public class DataBaseHelper extends SQLiteOpenHelper {

    // ...

    @Override
    public void onCreate(SQLiteDatabase db) {
    }

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

}
sqlite database in android errors

sqlite database in android errors


By : Destiny
Date : March 29 2020, 07:55 AM
it helps some times The sqldb in insertValues() is null.
Since you want to call insertValues() from onCreate(), you cannot init it there. Instead, pass the SQLiteDatabase as a parameter and call the methods on it, e.g.
code :
public void insertValues(SQLiteDatabase sqldb)
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