即使数据库不为空,Cursor也始终返回null.为什么？以及如何解决？谢谢.

public StatParcours getOneUserInfo(int id) {

SQLiteDatabase db = this.getReadableDatabase();

Cursor cursor = db.query(TABLE_USER, new String[] { KEY_USER_ID,

KEY_STUDN , KEY_STUDBD, KEY_TEACHN, KEY_TEACHBD}, KEY_USER_ID + "=?",

new String[] { String.valueOf(id) }, null, null, null, null);

StatParcours stat = null;

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

stat = new StatParcours(

Integer.parseInt(cursor.getString(0)),

cursor.getString(1),

cursor.getString(2),

cursor.getString(3),

cursor.getString(4));

}

return stat ;

}