我收到了错误
java.lang.IllegalArgumentException: the bind value at index 1 is null
我研究了它，我明白这是sql语句错误，我试图传递一个空值。
我检查了我的代码并修复了sql语句中的一些错误和空格，但仍然出现此错误。
04-15 11:07:32.820: E/AndroidRuntime(2258): FATAL EXCEPTION: main
04-15 11:07:32.820: E/AndroidRuntime(2258): Process: com.mad.naszlimerickmobile, PID: 2258
04-15 11:07:32.820: E/AndroidRuntime(2258): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mad.naszlimerickmobile/com.mad.naszlimerickmobile.AddEditActivity}: java.lang.IllegalArgumentException: the bind value at index 1 is null
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.app.ActivityThread.access$800(ActivityThread.java:135)
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.os.Handler.dispatchMessage(Handler.java:102)
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.os.Looper.loop(Looper.java:136)
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.app.ActivityThread.main(ActivityThread.java:5017)
04-15 11:07:32.820: E/AndroidRuntime(2258): at java.lang.reflect.Method.invokeNative(Native Method)
04-15 11:07:32.820: E/AndroidRuntime(2258): at java.lang.reflect.Method.invoke(Method.java:515)
04-15 11:07:32.820: E/AndroidRuntime(2258): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-15 11:07:32.820: E/AndroidRuntime(2258): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-15 11:07:32.820: E/AndroidRuntime(2258): at dalvik.system.NativeStart.main(Native Method)
04-15 11:07:32.820: E/AndroidRuntime(2258): Caused by: java.lang.IllegalArgumentException: the bind value at index 1 is null
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.database.sqlite.SQLiteProgram.bindString(SQLiteProgram.java:164)
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.database.sqlite.SQLiteProgram.bindAllArgsAsStrings(SQLiteProgram.java:200)
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:47)
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1314)
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1161)
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1032)
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1200)
04-15 11:07:32.820: E/AndroidRuntime(2258): at com.mad.naszlimerickmobile.NotesDB.getList(NotesDB.java:150)
04-15 11:07:32.820: E/AndroidRuntime(2258): at com.mad.naszlimerickmobile.AddEditActivity.onCreate(AddEditActivity.java:80)
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.app.Activity.performCreate(Activity.java:5231)
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
04-15 11:07:32.820: E/AndroidRuntime(2258): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
04-15 11:07:32.820: E/AndroidRuntime(2258): ... 11 more
AddEditActivity
public class AddEditActivity extends Activity implements OnKeyListener {
private EditText notetitleEditText;
private EditText notesEditText;
private Spinner listSpinner;
private NotesDB db;
private boolean editMode;
private String currentTabName = "";
private Note note;
// private Button cancelNoteBtn;
// private Button saveNoteBtn;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_edit_note);
// get references to widgets
listSpinner = (Spinner) findViewById(R.id.listSpinnerId);
notetitleEditText = (EditText) findViewById(R.id.noteTitleEditText);
notesEditText = (EditText) findViewById(R.id.noteContentEditText);
// set listeners
notetitleEditText.setOnKeyListener(this);
notesEditText.setOnKeyListener(this);
//get buttons
// cancelNoteBtn=(Button) findViewById(R.id.);
// get the database object
db = new NotesDB(this);
// set the adapter for the spinner
ArrayList<List> lists = db.getLists();
ArrayAdapter<List> adapter = new ArrayAdapter<List>(this,
R.layout.spinner_list, lists);
listSpinner.setAdapter(adapter);
// get edit mode from intent
Intent intent = getIntent();
editMode = intent.getBooleanExtra("editMode", false);
// if editing
if (editMode) {
// get task
long noteId = intent.getLongExtra("noteId", -1);
note = db.getNote(noteId);
// update UI with task
notetitleEditText.setText(note.getNoteTitle());
notesEditText.setText(note.getNotes());
}
// set the correct list for the spinner
long listID;
if (editMode) { // edit mode - use same list as selected task
listID = (int) note.getListId();
} else { // add mode - use the list for the current tab
currentTabName = intent.getStringExtra("tab");
listID = (int) db.getList(currentTabName).getListId();
}
// subtract 1 from database ID to get correct list position
int listPosition = (int) listID - 1;
listSpinner.setSelection(listPosition);
}
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_add_edit_menu, menu);
return true;
}
public boolean onOptionsIteamSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menuSaveNote:
saveToDB();
this.finish();
break;
case R.id.menuCancelNote:
this.finish();
break;
}
return super.onOptionsItemSelected(item);
}
private void saveToDB() {
int listId = listSpinner.getSelectedItemPosition() + 1;
String title = notetitleEditText.getText().toString();
String notes = notesEditText.getText().toString();
if (title == null || title.equals("")) {
return;
}
if (!editMode) {
note = new Note();
}
note.setListId(listId);
note.setNoteTitle(title);
note.setNotes(notes);
if (editMode) {
db.updateNote(note);
} else {
db.insertNote(note);
}
}
@Override
public boolean onKey(View view, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
// hide the soft Keyboard
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
return true;
} else if (keyCode == KeyEvent.KEYCODE_BACK) {
saveToDB();
return false;
}
return false;
}
}
NoteDB
public class NotesDB {
public static final String DB_NAME = "nlnotes.db";
public static final int DB_VERSION = 1;
// LIST TABLE
public static final String LIST_TABLE = "list";
public static final String LIST_ID = "listId";
public static final int LIST_ID_COL = 0;
public static final String LIST_NAME = "list_name";
public static final int LIST_NAME_COL = 1;
// NOTE TABLE
public static final String NOTE_TABLE = "note";
public static final String NOTE_ID = "noteId";
public static final int NOTE_ID_COL = 0;
public static final String NOTE_LIST_ID = "listId";
public static final int NOTE_LIST_ID_COL = 1;
public static final String NOTE_TITLE = "noteTitle";
public static final int NOTE_TITLE_COL = 2;
public static final String NOTE_NOTES = "notes";
public static final int NOTE_NOTES_COL = 3;
public static final String NOTE_COMPLETED = "date_completed";
public static final int NOTE_COMPLETED_COL = 4;
public static final String NOTE_HIDDEN = "hidden";
public static final int NOTE_HIDDEN_COL = 5;
public static final String CREATE_LIST_TABLE =
"CREATE TABLE " + LIST_TABLE + "(" +
LIST_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ LIST_NAME + " TEXT UNIQUE)";
public static final String CREATE_NOTE_TABLE =
"CREATE TABLE " + NOTE_TABLE + "(" +
NOTE_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
NOTE_LIST_ID + " INTEGER, " +
NOTE_TITLE + " TEXT, " +
NOTE_NOTES + " TEXT, " +
NOTE_COMPLETED + " TEXT, " +
NOTE_HIDDEN + " TEXT)";
public static final String DROP_LIST_TABLE = "DROP TABLE IF EXIST"
+ LIST_TABLE;
public static final String DROP_NOTE_TABLE = "DROP TABLE IF EXIST"
+ NOTE_TABLE;
public static class DBHelper extends SQLiteOpenHelper {
public DBHelper(Context context, String name, CursorFactory factory,
int version) {
super(context, name, factory, version);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_LIST_TABLE);
db.execSQL(CREATE_NOTE_TABLE);
db.execSQL("INSERT INTO list VALUES (1, 'Personal')");
db.execSQL("INSERT INTO list VALUES (2, 'Other')");
db.execSQL("INSERT INTO note VALUES (1, 1, 'Your first note', "
+ "'Touch to edit', '0', '0')");
db.execSQL("INSERT INTO note VALUES (2, 1, 'Your second note ', "
+ "'Touch to edit', '0', '0')");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.d("Note list", "Upgrading db from version" + oldVersion
+ " to " + newVersion);
Log.d("Note list", "Deleting all content!");
db.execSQL(NotesDB.DROP_LIST_TABLE);
db.execSQL(NotesDB.DROP_NOTE_TABLE);
onCreate(db);
}
}
private SQLiteDatabase db;
private DBHelper dbhelper;
public NotesDB(Context context) {
dbhelper = new DBHelper(context, DB_NAME, null, DB_VERSION);
}
private void openReadableDB() {
db = dbhelper.getReadableDatabase();
}
private void openWritableDB() {
db = dbhelper.getWritableDatabase();
}
private void closeDB() {
if (db != null)
db.close();
}
// to many args?
public ArrayList<List> getLists() {
ArrayList<List> lists = new ArrayList<List>();
openReadableDB();
Cursor cursor = db.query(LIST_TABLE, null, null, null, null, null, null);
while (cursor.moveToNext()) {
List list = new List();
list.setListId(cursor.getInt(LIST_ID_COL));
list.setList_name(cursor.getString(LIST_NAME_COL));
lists.add(list);
}
cursor.close();
closeDB();
return lists;
}
// to many args?
public List getList(String list_name) {
String where = LIST_NAME + "= ?";
String[] whereArgs = { list_name };
openReadableDB();
Cursor cursor = db.query(LIST_TABLE, null, where, whereArgs, null,
null, null);
List list = null;
cursor.moveToFirst();
list = new List(cursor.getInt(LIST_ID_COL),
cursor.getString(LIST_NAME_COL));
cursor.close();
this.closeDB();
return list;
}
// //////////////////////////////////////////
public ArrayList<Note> getNotes(String list_name) {
String where = NOTE_LIST_ID + "= ? AND " + NOTE_HIDDEN + "!='1'";
long listID = getList(list_name).getListId();
String[] whereArgs = { Long.toString(listID) };
this.openReadableDB();
Cursor cursor = db.query(NOTE_TABLE, null, where, whereArgs, null,
null, null);
ArrayList<Note> notes = new ArrayList<Note>();
while (cursor.moveToNext()) {
notes.add(getNoteFromCursor(cursor));
}
if (cursor != null)
cursor.close();
this.closeDB();
return notes;
}
public Note getNote(long noteId) {
String where = NOTE_ID + "= ?";
String[] whereArgs = { Long.toString(noteId) };
this.openReadableDB();
Cursor cursor = db.query(NOTE_TABLE, null, where, whereArgs, null,
null, null);
cursor.moveToFirst();
Note note = getNoteFromCursor(cursor);
if (cursor != null)
cursor.close();
this.closeDB();
return note;
}
private static Note getNoteFromCursor(Cursor cursor) {
if (cursor == null || cursor.getCount() == 0) {
return null;
} else {
try {
Note note = new Note(cursor.getInt(NOTE_ID_COL),
cursor.getInt(NOTE_LIST_ID_COL),
cursor.getString(NOTE_TITLE_COL),
cursor.getString(NOTE_NOTES_COL),
cursor.getString(NOTE_COMPLETED_COL),
cursor.getString(NOTE_HIDDEN_COL));
return note;
} catch (Exception e) {
return null;
}
}
}
public long insertNote(Note note) {
ContentValues cv = new ContentValues();
cv.put(NOTE_LIST_ID, note.getNoteId());
cv.put(NOTE_TITLE, note.getNoteTitle());
cv.put(NOTE_NOTES, note.getNotes());
cv.put(NOTE_COMPLETED, note.getCompletedDate());
cv.put(NOTE_HIDDEN, note.getHidden());
this.openWritableDB();
long rowID = db.insert(NOTE_TABLE, null, cv);
this.closeDB();
return rowID;
}
public int updateNote(Note note) {
ContentValues cv = new ContentValues();
cv.put(NOTE_LIST_ID, note.getNoteId());
cv.put(NOTE_TITLE, note.getNoteTitle());
cv.put(NOTE_NOTES, note.getNotes());
cv.put(NOTE_COMPLETED, note.getCompletedDate());
cv.put(NOTE_HIDDEN, note.getHidden());
String where = NOTE_ID + "= ?";
String[] whereArgs = { String.valueOf(note.getNoteId()) };
this.openWritableDB();
int rowCount = db.update(NOTE_TABLE, cv, where, whereArgs);
this.closeDB();
return rowCount;
}
public int deleteTask(long noteId) {
String where = NOTE_ID + "= ?";
String[] whereArgs = { String.valueOf(noteId) };
this.openWritableDB();
int rowCount = db.delete(NOTE_TABLE, where, whereArgs);
this.closeDB();
return rowCount;
}
}
我感谢任何帮助！
答案 0 :(得分：11)
你的问题在这一行：
Cursor cursor = db.query(LIST_TABLE, null, where, whereArgs, null, null, null);
由于您的whereArgs是传递给方法的参数，如果此参数为null，您将尝试将null值绑定到? where字符串 - 导致此错误。
正确的方法是有两个不同的where子句 - 一个用于null，另一个用于非null值，特别是考虑到语法不同。像这样：
String whereNotNull = LIST_NAME + "= ?";
String whereNull = LIST_NAME + " IS NULL";
String[] whereArgs = { list_name };
openReadableDB();
Cursor cursor = whereArgs == null
? db.query(LIST_TABLE, null, whereNull, null, null, null, null)
: db.query(LIST_TABLE, null, whereNotNull, whereArgs, null, null, null);
这同样适用于同一课程中的getNotes方法。
另外，作为旁注，我强烈建议您在查询中指定列名，而不是传递null，即使您确实需要所有列。如果确实指定了列，则可以保证游标中的列顺序与query方法中的列相同。如果您只是为它传递null，那么应与创建时的顺序相同 - 但从长远来看，它很容易搞砸了您需要稍后修改您的数据库。
编辑：再次查看您的AddEditActivity代码，我怀疑您永远不会希望将null传递给该方法并且该代码：
currentTabName = intent.getStringExtra("tab");
listID = (int) db.getList(currentTabName).getListId();
假设值始终存在 - 并且是非null String。当您明确获得null时，我建议您检查此意图的启动位置以及如何将String extra添加到其中。您可能还想做两件事：
在将currentTabName传递给!= null之前检查getList是否为static final String - 并处理错误情况。
在这种情况下，将额外参数（ tab ）的名称放入{{1}}变量并从那里引用它 - 这样就排除了拼写错误的可能性。
答案 1 :(得分：0)
这意味着Selection参数为NULL。
绑定值属于选择的选择参数。