Android CursorIndexOutOfBoundsException：

我是android新手，我正在尝试获取与特定列值相关的游标值。但它显示为空

 public int getDashBoardCount() {
    String countQuery = "SELECT * FROM " + DASHBOARD_TABLE + " WHERE " + VECHICAL_TYPE + " = " + 'c';

从这里我也没有得到这样的列：c（代码1）：，而编译：SELECT*From dashboard\u table，其中vehicle\u type=c

     String countQuery = "SELECT  * FROM " + DASHBOARD_TABLE;
    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.rawQuery(countQuery, null);
    int cnt = cursor.getCount();
    cursor.close();
    return cnt;
}

public DashBoardAvaCapModel getVechicalRelAva(String vechical_type) {
    SQLiteDatabase db = null;
    Cursor cursor = null;
    DashBoardAvaCapModel dash = null;

    try {
        db = this.getReadableDatabase();
        cursor = db.query(DASHBOARD_TABLE, new String[]{_ID,
                        AVAILABLE, CAPACITY, BOOKED, VECHICAL_TYPE}, VECHICAL_TYPE + "=?",
                new String[]{String.valueOf(vechical_type)}, null, null, null, null);

        int idkey = cursor
                .getColumnIndex(_ID);
        int available = cursor
                .getColumnIndex(AVAILABLE);
        int capactity = cursor
                .getColumnIndex(CAPACITY);
        int booked = cursor
                .getColumnIndex(BOOKED);
        int vechicaltype = cursor
                .getColumnIndex(VECHICAL_TYPE);

        if (cursor != null && cursor.moveToFirst())

            dash = new DashBoardAvaCapModel(Long.valueOf(cursor.getString(idkey)),
                    cursor.getString(available), cursor.getString(capactity), cursor.getString(booked), cursor.getString(vechicaltype));
        Log.e("dash", "" + cursor.getString(available));

    } catch (final Exception ex) {
        String exp = String.valueOf(ex);
        Log.e("Databa", "" + exp);
    } finally {
        cursor.close();
        db.close();
    }

    return dash;

}

---

写了这行之后

   cursor = db.query(DASHBOARD_TABLE, new String[]{_ID,
                    AVAILABLE, CAPACITY, BOOKED, VECHICAL_TYPE}, VECHICAL_TYPE + "=?",
            new String[]{String.valueOf(vechical_type)}, null, null, null, null);

请试着写信

cursor.moveToFirst();

对于第一个，您可以使用

String countQuery = "SELECT * FROM " + DASHBOARD_TABLE + " WHERE " + VECHICAL_TYPE + " = '" + c + "'"

其中c是任意变量

---

希望这将帮助您

什么是

VECHICAL\u类型

？你能发布你的

CREATE TABLE

语句吗？目前您正在使用

VECHICAL\u TYPE

作为列名和参数，因此实际上您是在说

其中VECHICAL\u TYPE=VECHICAL\u TYPE

@marcin VECHICAL\u TYPE是string，create table语句是string DASHBOARD\u SAVING=“create table IF NOT EXISTS”+DASHBOARD\u table+”（“+\u ID+“整数主键自动递增，“+可用+”文本，“+容量+”文本，“+BOOKED+”文本，“+VECHICAL_TYPE+”文本“+”）";什么是

车辆类型

？i、 e.

VEHICAL\u TYPE=…

@Michael vechical\u TYPE是字符串值引用，它是列id引用；嗨，阿曼，谢谢你的快速反应，我已经准备好用这个了，但是它不起作用，你哪行出错了？你能不能指定光标后的位置？首先，我正在尝试重新获取该值，但我显示错误光标超出边界exception@AMANSINGH

cursor.moveToFirst（）

已用于代码Aravind postedin first line try with

String countQuery=“SELECT*FROM”+DASHBOARD\u TABLE+，其中“+VECHICAL\u TYPE+”='c'