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PODeleting and updating the database
 

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    <p>Iam a beginner in android SQLite.Following is the code for student database I got from one site.I understood the code but I don't know how to update and delete any row.Can someone please help?What should I add to the following code?</p> <pre><code>public class MainActivity extends Activity { String fname,lname,email; SQLiteDatabase db; TableRow tableRow; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); db=openOrCreateDatabase("MyDB1",MODE_PRIVATE, null); db.execSQL("CREATE TABLE IF NOT EXISTS Student(fname VARCHAR,lname VARCHAR,email VARCHAR);"); } public void data(View view) { EditText edittext1=(EditText )findViewById(R.id.firstname); EditText edittext2=(EditText )findViewById(R.id.lastname); EditText edittext3=(EditText )findViewById(R.id.email); fname=edittext1.getText().toString(); lname=edittext2.getText().toString(); email=edittext3.getText().toString(); db.execSQL("INSERT INTO Student VALUES('"+fname+"','"+lname+"','"+email+"');"); } public void showdata(View view) { Cursor c=db.rawQuery("SELECT * from Student", null); int count= c.getCount(); c.moveToFirst(); TableLayout tableLayout = new TableLayout(getApplicationContext()); tableLayout.setVerticalScrollBarEnabled(true); TableRow tableRow; TextView textView,textView1,textView2,textView3,textView4,textView5; tableRow = new TableRow(getApplicationContext()); textView=new TextView(getApplicationContext()); textView.setText("Firstname"); textView.setTextColor(Color.RED); textView.setTypeface(null, Typeface.BOLD); textView.setPadding(20, 20, 20, 20); tableRow.addView(textView); textView4=new TextView(getApplicationContext()); textView4.setText("LastName"); textView4.setTextColor(Color.RED); textView4.setTypeface(null, Typeface.BOLD); textView4.setPadding(20, 20, 20, 20); tableRow.addView(textView4); textView5=new TextView(getApplicationContext()); textView5.setText("Email"); textView5.setTextColor(Color.RED); textView5.setTypeface(null, Typeface.BOLD); textView5.setPadding(20, 20, 20, 20); tableRow.addView(textView5); tableLayout.addView(tableRow); for (Integer j = 0; j &lt; count; j++) { tableRow = new TableRow(getApplicationContext()); textView1 = new TextView(getApplicationContext()); textView1.setText(c.getString(c.getColumnIndex("fname"))); textView2 = new TextView(getApplicationContext()); textView2.setText(c.getString(c.getColumnIndex("lname"))); textView3 = new TextView(getApplicationContext()); textView3.setText(c.getString(c.getColumnIndex("email"))); textView1.setPadding(20, 20, 20, 20); textView2.setPadding(20, 20, 20, 20); textView3.setPadding(20, 20, 20, 20); tableRow.addView(textView1); tableRow.addView(textView2); tableRow.addView(textView3); tableLayout.addView(tableRow); c.moveToNext() ; } setContentView(tableLayout); db.close(); } public void close(View view) { System.exit(0); } </code></pre>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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