Couldn't read row 0, col -1 from CursorWindow

java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. 

Make sure the Cursor is initialized correctly before accessing data from it. 

 

SQLiteDatabase  學習過程中，使用query() 查詢表單數據時，遇到Couldn't read row 0, col -1 from CursorWindow錯誤。

排除建表字段錯誤、拼寫錯誤、query()輸入字段錯誤。當我使用rawQuery()方法取代query()方法，問題就解決了。

 

代碼如下：

1.建表 MyDatabaseHelper

    private static final String CREATE_CONTACTS = "create table contact ("
            + "id integer primary key autoincrement, "
            + "name text, "
            + "number text )";

    public MyDatabaseHelper(Context context, String name, CursorFactory factory, int version) {
        super(context, name, factory, version);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_CONTACTS);        
    }

2. 查詢 根據searchName查詢表單

    private void searchContact(String searchName) {
        db = dbHelper.getReadableDatabase();
        //Cursor cursor = db.query("contact", new String[] {"name"}, "name = ?", new String[] {searchName}, null, null, null); 
        Cursor cursor = db.rawQuery("select * from contact where name = ?", new String[] {searchName});
        if(cursor.moveToFirst()) {
            //String name = cursor.getString(cursor.getColumnIndex("name"));
            String number = cursor.getString(cursor.getColumnIndex("number"));
            tv_name.setText(searchName);
            tv_number.setText(number);
            tel = "tel:" + number;
        }else {
            tv_name.setText("404! Not Found");
            tv_number.setText("10086");
            tel = "tel:10086";
        }
        cursor.close();
        db.close();
    }

1.當使用query(String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy)

String name = cursor.getString(cursor.getColumnIndex("name")) 

用這句代碼檢驗 可以獲得到name,證明cursor正確指向所要查詢數據。

String number = cursor.getString(cursor.getColumnIndex("number"))

但這句代碼就會報Couldn't read row 0, col -1 from CursorWindow。

getColumnIndex("number") 返回值竟然是-1，百思不得其解！

 

2.使用rawQuery(String sql, String[] selectionArgs)

name和number字段都可以准確獲得，問題完美解決。

 

轉載請注明出處：http://www.cnblogs.com/michaelwong/p/4128299.html