Finalizing a Cursor that has not been deactivated or closed

Finalizing a Cursor that has not been deactivated or closed

 

先贴出代码：

 

 

public List<UnitInfo> findAllGroup() {
		List<UnitInfo> infos=new ArrayList<UnitInfo>();
		try {
			db = dbManager.openDatabase();
			String sql="SELECT * FROM dict_unit_display";
			System.out.println("-------db---open------:"+db.isOpen());
			cursor=db.query("dict_unit_display", null, null, null, null, null, null);
			System.out.println("---------------cursor--close---:"+cursor.isClosed());
			while (cursor.moveToNext()) {
				UnitInfo unit=new UnitInfo();
				unit.setId(cursor.getLong(cursor.getColumnIndex("ID")));
				unit.setUnitCode(cursor.getString(cursor.getColumnIndex("UNIT_CODE")));
				unit.setUnitName(cursor.getString(cursor.getColumnIndex("UNIT_NAME")));
				unit.setUnitSimpleName(cursor.getString(cursor.getColumnIndex("UNIT_SIMPLE_NAME")));
				unit.setUnitNode(cursor.getString(cursor.getColumnIndex("UNIT_NODE")));
				unit.setUnitFatherNode(cursor.getString(cursor.getColumnIndex("UNIT_NODE_FATHER")));
				System.out.println("----------------------------------");
				System.out.println("-----ID-----:"+ unit.getId());
				System.out.println("-----UNIT_CODE-----:" + unit.getUnitCode());
				System.out.println("-----UNIT_NAME-----:" + unit.getUnitName());
				System.out.println("-----UNIT_SIMPLE_NAME-----:" + unit.getUnitSimpleName());
				System.out.println("-----UNIT_NODE-----:" + unit.getUnitNode());
				System.out.println("-----UNIT_NODE_FATHER-----:" + unit.getUnitFatherNode());
				System.out.println("----------------------------------");
				infos.add(unit);
			}
		} catch (Exception e) {
			System.out.println("------findAllGroup-----数据读取错误");
		} finally {
			DBManager.closeDatabase(db, cursor);
		}
		return infos;
	}

 

代码写的看似没有任何问题，但是由于Cursor的独特性，不得不吐糟下，Cursor取值采用的是先取下标再根据下标去取对应的返回值，这里面就有个问题，如果当前字段在数据库中为 空值 那么通过Cursor  getString()或者getLong()的时候就会出现问题，进而导致一连串的错误。

解决方法就是直接用下标去取值就行了。