Android错误：绑定参数太多。提供了1个参数，但该语句需要0个参数

Question

我在删除数据库时单击按钮，我的删除方法如下

 public int deleteDatabase(String tableName) {
    SQLiteDatabase db = database.getWritableDatabase();

    String whereClause = null; // delete all rows
    String[] whereArgs = { null };
    int count = db.delete(tableName, whereClause, whereArgs);
    db.close();
    return count;

}

 if (DatabaseHelper.getInstance(getApplicationContext())
                .isTableExists(MY_TABLE)) {
            Log.d(TAG, "Table exist, delete database");
            deleteDatabase(MY_LIST_TABLE);

        }

，错误如下：绑定参数太多。提供了1个参数，但该语句需要0个参数。

Answer 1

String whereClause = null; // delete all rows
String[] whereArgs = { null };
int count = db.delete(tableName, whereClause, whereArgs);

如果您提供whereArgs，则还必须提供有效的where子句（使用?占位符）。改变它

int count = db.delete(tableName, null, null);