I got a database called test_database.
And I got a table called tbl_marks.
In tbl_marks there are following rows:
- _id
- name
- subid
- gewicht
- datum
There are 4 entries. two with subid 1 and the other 2 with subid 2.
Now I like to do following:
SELECT * FROM tbl_marks WHERE subid = 1;
So finally I like to list all marks with subid 1, 2, 3 or what ever in a listview.
How can I do that by cursor?
I was trying to learn it by a tutorial but it failed…
Higherpass Android Tutorial Accessing-Data-With-Android-Cursors
Anddev Working with the sqlite database – Cursors
Code: The commented part is what I got before (it listed everything)
private void fillData() {
// Get all of the notes from the database and create the item list
mDbHelper.open_database_rw();
Cursor mCursor = db.rawQuery("SELECT _id, subid, name, mark, gewicht, datum FROM tbl_marks ORDER BY subid;", null);
startManagingCursor(mCursor);
if (mCursor != null) {
int intName = mCursor.getColumnIndexOrThrow("subid");
do {
teststring = mCursor.getString(intName);
String[] from = new String[] { dbHelper.KEY_NAME_MARKS, dbHelper.KEY_MARK_MARKS, dbHelper.KEY_GEWICHT_MARKS, dbHelper.KEY_DATUM_MARKS};
int[] to = new int[] {R.id.txt_marks_row, R.id.txt_note, R.id.txt_gewicht, R.id.txt_datum};
SimpleCursorAdapter notes = new SimpleCursorAdapter(this, R.layout.show_marks, mCursor, from, to);
setListAdapter(notes);
} while (mCursor.moveToNext());
}
LogCat says that the column subid does not exists. But it’s there and the db has been opened.
02-07 11:30:00.500: D/dalvikvm(9913): GC_EXTERNAL_ALLOC freed 54K, 50% free 2694K/5379K, external 0K/0K, paused 56ms
02-07 11:30:00.535: D/dalvikvm(9913): GC_EXTERNAL_ALLOC freed 4K, 50% free 2698K/5379K, external 13K/523K, paused 27ms
02-07 11:30:10.457: D/AndroidRuntime(9913): Shutting down VM
02-07 11:30:10.457: W/dalvikvm(9913): threadid=1: thread exiting with uncaught exception (group=0x40235568)
02-07 11:30:10.457: E/AndroidRuntime(9913): FATAL EXCEPTION: main
02-07 11:30:10.457: E/AndroidRuntime(9913): java.lang.RuntimeException: Unable to start activity ComponentInfo{test.marco.notenha/test.marco.notenha.mark}: java.lang.IllegalArgumentException: column 'subid' does not exist
02-07 11:30:10.457: E/AndroidRuntime(9913): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1664)
02-07 11:30:10.457: E/AndroidRuntime(9913): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1680)
02-07 11:30:10.457: E/AndroidRuntime(9913): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-07 11:30:10.457: E/AndroidRuntime(9913): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
02-07 11:30:10.457: E/AndroidRuntime(9913): at android.os.Handler.dispatchMessage(Handler.java:99)
02-07 11:30:10.457: E/AndroidRuntime(9913): at android.os.Looper.loop(Looper.java:130)
02-07 11:30:10.457: E/AndroidRuntime(9913): at android.app.ActivityThread.main(ActivityThread.java:3703)
02-07 11:30:10.457: E/AndroidRuntime(9913): at java.lang.reflect.Method.invokeNative(Native Method)
02-07 11:30:10.457: E/AndroidRuntime(9913): at java.lang.reflect.Method.invoke(Method.java:507)
02-07 11:30:10.457: E/AndroidRuntime(9913): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
02-07 11:30:10.457: E/AndroidRuntime(9913): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
02-07 11:30:10.457: E/AndroidRuntime(9913): at dalvik.system.NativeStart.main(Native Method)
02-07 11:30:10.457: E/AndroidRuntime(9913): Caused by: java.lang.IllegalArgumentException: column 'subid' does not exist
02-07 11:30:10.457: E/AndroidRuntime(9913): at android.database.AbstractCursor.getColumnIndexOrThrow(AbstractCursor.java:314)
02-07 11:30:10.457: E/AndroidRuntime(9913): at test.marco.notenha.mark.fillData(mark.java:180)
02-07 11:30:10.457: E/AndroidRuntime(9913): at test.marco.notenha.mark.onCreate(mark.java:70)
02-07 11:30:10.457: E/AndroidRuntime(9913): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-07 11:30:10.457: E/AndroidRuntime(9913): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1628)
02-07 11:30:10.457: E/AndroidRuntime(9913): ... 11 more
That’s line 180: int intName = mCursor.getColumnIndexOrThrow(“subid”);
02-07 11:52:26.304: D/dalvikvm(10075): GC_EXTERNAL_ALLOC freed 48K, 50% free 2694K/5379K, external 0K/0K, paused 38ms
02-07 11:52:26.339: D/dalvikvm(10075): GC_EXTERNAL_ALLOC freed 4K, 50% free 2698K/5379K, external 13K/523K, paused 30ms
02-07 11:52:29.433: D/AndroidRuntime(10075): Shutting down VM
02-07 11:52:29.433: W/dalvikvm(10075): threadid=1: thread exiting with uncaught exception (group=0x40235568)
02-07 11:52:29.437: E/AndroidRuntime(10075): FATAL EXCEPTION: main
02-07 11:52:29.437: E/AndroidRuntime(10075): java.lang.RuntimeException: Unable to start activity ComponentInfo{test.marco.notenha/test.marco.notenha.mark}: android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 3
02-07 11:52:29.437: E/AndroidRuntime(10075): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1664)
02-07 11:52:29.437: E/AndroidRuntime(10075): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1680)
02-07 11:52:29.437: E/AndroidRuntime(10075): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-07 11:52:29.437: E/AndroidRuntime(10075): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
02-07 11:52:29.437: E/AndroidRuntime(10075): at android.os.Handler.dispatchMessage(Handler.java:99)
02-07 11:52:29.437: E/AndroidRuntime(10075): at android.os.Looper.loop(Looper.java:130)
02-07 11:52:29.437: E/AndroidRuntime(10075): at android.app.ActivityThread.main(ActivityThread.java:3703)
02-07 11:52:29.437: E/AndroidRuntime(10075): at java.lang.reflect.Method.invokeNative(Native Method)
02-07 11:52:29.437: E/AndroidRuntime(10075): at java.lang.reflect.Method.invoke(Method.java:507)
02-07 11:52:29.437: E/AndroidRuntime(10075): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
02-07 11:52:29.437: E/AndroidRuntime(10075): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
02-07 11:52:29.437: E/AndroidRuntime(10075): at dalvik.system.NativeStart.main(Native Method)
02-07 11:52:29.437: E/AndroidRuntime(10075): Caused by: android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 3
02-07 11:52:29.437: E/AndroidRuntime(10075): at android.database.AbstractCursor.checkPosition(AbstractCursor.java:580)
02-07 11:52:29.437: E/AndroidRuntime(10075): at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:214)
02-07 11:52:29.437: E/AndroidRuntime(10075): at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:41)
02-07 11:52:29.437: E/AndroidRuntime(10075): at test.marco.notenha.mark.fillData(mark.java:183)
02-07 11:52:29.437: E/AndroidRuntime(10075): at test.marco.notenha.mark.onCreate(mark.java:70)
02-07 11:52:29.437: E/AndroidRuntime(10075): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-07 11:52:29.437: E/AndroidRuntime(10075): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1628)
02-07 11:52:29.437: E/AndroidRuntime(10075): ... 11 more
The “subid” column must be in the SELECT column list in order for the mCursor.getColumnIndexOrThrow(“subid”) call to return it:
Edit:
Now you need to call mCursor.moveToFirst() and check that it returns “true” (i.e. the result list is not empty). See this question. As an example: