获取例外,而在Android的访问SQLite数据库 [英] Getting exception while accessing sqlite database in android

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问题描述

我想我的应用程序访问SQLite数据库并获得此异常:

  11月12日至27日:32:12.760:E /异常:(746):java.lang.IllegalStateException:试图收购在ContactListOfNumbersForWhichRuleIsAlreadySpecified发生密切SQLiteClosable异常的引用() DatabaseHandlerRule.java的

我用这code:

 公开的ArrayList<串GT; ContactListOfNumbersForWhichRuleIsAlreadySpecified(DatabaseHandlerRule活动)
    {
        ContactRule接触= NULL;
        光标光标= NULL;
        SQLiteDatabase DB = NULL;
        ArrayList的<串GT; contactList = NULL;
        尝试
        {
            contactList =新的ArrayList<串GT;();            // SQLiteActivity1.ReadingAllContactsRule(SplashActivity.s_dbRule);            字符串selectQuery =SELECT * FROM+ TABLE_CONTACTS +WHERE+ KEY_NAME +!='
            +ABCDE#$%&放大器; *()@#$%+'+和+ KEY_PH_NO +=!+ABCDE#$%&放大器; *()@#$%+ +和+ KEY_DATE +='+0+';            DB = this.getReadableDatabase();            如果(!db.isOpen()){
                DB = SQLiteDatabase.openDatabase(
                        /data/data/com.velosys.smsManager/databases/rulesManager
                        空,SQLiteDatabase.OPEN_READWRITE);
            }            光标= db.rawQuery(selectQuery,NULL);            //通过所有行循环,并增加列表
            如果(cursor.moveToFirst()){
                做{
                    接触=新ContactRule();
                    contact.setID(的Integer.parseInt(cursor.getString(0)));
                    contact.setName(cursor.getString(1));
                    contact.setPhoneNumber(cursor.getString(2));
                    contact.setFolderName(cursor.getString(3));
                    contact.setParentFolderAddress(cursor.getString(4));
                    contact.setTime(cursor.getLong(5));
                    contact.setDate(cursor.getLong(6));
                    //添加联系人名单
                    contactList.add(contact.getName());
                }而(cursor.moveToNext());
            }
            否则如果(!cursor.moveToFirst())
            {
                Log.e(消息,第不是在数据库甚至一个单一的数字指定,);
                返回contactList;
            }
        }
        赶上(例外五)
        {
            Log.e(异常:E +异常的ContactListOfNumbersForWhichRuleIsAlreadySpecified()DatabaseHandlerRule.java的发生);
        }
        最后
        {
            如果(光标= NULL&放大器;!&安培;!cursor.isClosed())
                cursor.close();
            如果(DB = NULL&放大器;!&安培; db.isOpen())
                db.close();
        }
        返回contactList;
    }

我已经寻找这个异常背后的原因,但没有暗示我的情况:


  1. 我不是想写,但是读database.Hence没有问题出现在这里对并发性。

  2. 我使用数据库辅助类的实例 DB = this.getReadableDatabase();

  3. 我关闭数据库中正确每每次我打开它。

请帮忙me.Thanks提前。

编辑:

其strange.After终于取出并把code,而不finallly块,一切工作fine.Can谁能告诉我这背后的原因是什么?

  //最后
            {
                如果(光标= NULL&放大器;!&安培;!cursor.isClosed())
                    cursor.close();
                如果(DB = NULL&放大器;!&安培; db.isOpen())
                    db.close();
            }


解决方案

请删除finally块。在你有密切的分贝和光标所以这个错误出现。

I am trying to access sqlite database in my app and getting this exception:

12-27 11:32:12.760: E/Exception:(746): java.lang.IllegalStateException: attempt to acquire a reference on a close SQLiteClosable Exception occured in ContactListOfNumbersForWhichRuleIsAlreadySpecified() of DatabaseHandlerRule.java

I am using this code:

public ArrayList<String> ContactListOfNumbersForWhichRuleIsAlreadySpecified(DatabaseHandlerRule Activity) 
    {
        ContactRule contact = null;
        Cursor cursor =  null;
        SQLiteDatabase db =  null;
        ArrayList<String> contactList =  null;
        try
        {
            contactList = new ArrayList<String>();

            //      SQLiteActivity1.ReadingAllContactsRule(SplashActivity.s_dbRule);

            String selectQuery = "SELECT  * FROM " + TABLE_CONTACTS + " WHERE "+KEY_NAME+" !='"
            +"abcde#$%&*()@#$%"+"'"+" AND "+KEY_PH_NO+"!='"+"abcde#$%&*()@#$%"+"'"+" AND "+KEY_DATE+" ='"+"0"+"'";

            db = this.getReadableDatabase();

            if (!db.isOpen()) {
                db = SQLiteDatabase.openDatabase(
                        "/data/data/com.velosys.smsManager/databases/rulesManager",
                        null, SQLiteDatabase.OPEN_READWRITE);
            }

            cursor = db.rawQuery(selectQuery, null);

            // looping through all rows and adding to list
            if (cursor.moveToFirst()) {
                do {
                    contact = new ContactRule();
                    contact.setID(Integer.parseInt(cursor.getString(0)));
                    contact.setName(cursor.getString(1));
                    contact.setPhoneNumber(cursor.getString(2));
                    contact.setFolderName(cursor.getString(3));
                    contact.setParentFolderAddress(cursor.getString(4));
                    contact.setTime(cursor.getLong(5));
                    contact.setDate(cursor.getLong(6));
                    // Adding contact to list
                    contactList.add(contact.getName());
                } while (cursor.moveToNext());
            }
            else if(!cursor.moveToFirst())
            {
                Log.e("Message: ","Rule is not specified for even a single number in database");
                return contactList;             
            }
        }
        catch(Exception e)
        {
            Log.e("Exception: ",e+" Exception occured in ContactListOfNumbersForWhichRuleIsAlreadySpecified() of DatabaseHandlerRule.java");
        }
        finally
        {   
            if(cursor != null && !cursor.isClosed())
                cursor.close(); 
            if(db != null && db.isOpen())
                db.close();
        }
        return contactList;
    }

I have searched for the reasons behind this exception but nothing implies to my case:

  1. I am not trying to write but read the database.Hence no question arises here about concurrency.
  2. I am using instance of Database helper class in db = this.getReadableDatabase();
  3. I am closing database properly each and everytime i open it.

Please help me.Thanks in advance.

Edit:

Its strange.After removing finally and putting the code without finallly block,everything is working fine.Can anyone please tell me the reason behind this?

          //finally
            {   
                if(cursor != null && !cursor.isClosed())
                    cursor.close(); 
                if(db != null && db.isOpen())
                    db.close();
            }

解决方案

Please remove finally block. in that you have close db and cursor so it this error comes.

这篇关于获取例外,而在Android的访问SQLite数据库的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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