Caused by: java.lang.IllegalArgumentException: column '_id' does not exist

问题:

i want to show my table using cursor and list view. but i got error.

 Caused by: java.lang.IllegalArgumentException: column '_id' does not exist 

but i didn't declare _id in my application. can somebody help me?

this is my code in dbHelper.

public Cursor DataPesanKeluar() {     Cursor c = dba.rawQuery(             " SELECT "             + kel_id + ","             + e_chiperteks + ","             + k_nama + ","             + kel_waktu +             " FROM " + tbPesan + " INNER JOIN " + tbPesanKeluar +             " ON "  + tbPesan + "." + p_idpesan + "=" + tbPesanKeluar + "." + kel_idpesan +             " INNER JOIN " + tbEnkrip +             " ON " + tbPesan + "." + p_idenkrip + "=" + tbEnkrip + "." + e_idenkrip +             " INNER JOIN " + tbKontak +              " ON " + tbPesan + "." + p_idkontak + "=" + tbKontak + "." + k_id , null);     return c; } 

and this is my class to display data.

listKeluar = (ListView)findViewById(R.id.listKeluar);      String [] keluar = { data.k_nama, data.m_chiperteks, data.kel_waktu };     int[] k = { R.id.tNama, R.id.tChiper, R.id.tWaktu };     cursor = data.DataPesanKeluar();     SimpleCursorAdapter keluarAdapter = new SimpleCursorAdapter( this, R.layout.baris_keluar, cursor, keluar, k ); //this is my error     listKeluar.setAdapter(keluarAdapter);     listKeluar.setOnItemClickListener( new OnItemClickListener() {          @Override         public void onItemClick(AdapterView arg0, View arg1, int arg2, long arg3) {             Cursor listCursor = (Cursor) arg0.getItemAtPosition(arg2);             String idkeluar = listCursor.getString(listCursor.getColumnIndex(data.kel_id));             String nama = listCursor.getString(listCursor.getColumnIndex(data.k_nama));             String chiperteks = listCursor.getString(listCursor.getColumnIndex(data.m_chiperteks));             String waktu = listCursor.getString(listCursor.getColumnIndex(data.kel_waktu)); 

回答1:

The Cursor must include a column named _id or this class will not work.

You can maybe try to fake it using your existing ID:

Cursor c = dba.rawQuery(         " SELECT "         + kel_id + " AS _id,"         + kel_id + ","         + e_chiperteks + ","         + k_nama + ","         + kel_waktu +         " FROM " + tbPesan + " INNER JOIN " + tbPesanKeluar +         " ON "  + tbPesan + "." + p_idpesan + "=" + tbPesanKeluar + "." + kel_idpesan +         " INNER JOIN " + tbEnkrip +         " ON " + tbPesan + "." + p_idenkrip + "=" + tbEnkrip + "." + e_idenkrip +         " INNER JOIN " + tbKontak +          " ON " + tbPesan + "." + p_idkontak + "=" + tbKontak + "." + k_id , null); 

回答2:

Make key_id as "_id"

public Cursor DataPesanKeluar() { Cursor c = dba.rawQuery(         " SELECT "         + kel_id + " AS _id" + ","         + e_chiperteks + ","         + k_nama + ","         + kel_waktu +         " FROM " + tbPesan + " INNER JOIN " + tbPesanKeluar +         " ON "  + tbPesan + "." + p_idpesan + "=" + tbPesanKeluar + "." + kel_idpesan +         " INNER JOIN " + tbEnkrip +         " ON " + tbPesan + "." + p_idenkrip + "=" + tbEnkrip + "." + e_idenkrip +         " INNER JOIN " + tbKontak +          " ON " + tbPesan + "." + p_idkontak + "=" + tbKontak + "." + k_id , null); return c; 

}

回答3:

Just remove kel_id + "," from your select statement because the table from which your are trying to get the data does'nt contain '_id' column.

回答4:

Add _id INTEGER PRIMARY KEY AUTOINCREMENT to your create table statement. Android sometimes requires the _id field

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