Java Eclipse表示无法执行操作，因为连接池已关闭

我正在SQLite数据库中存储一些值，并试图在单击按钮时将其发送到MySQL。以下是相关代码

MainActivity.java

private class SendCollections extends AsyncTask<Void, Void, Void>{

        @Override
        protected Void doInBackground(Void... params) {

            JSONArray json = new JSONArray();
            for(int i = 0; i < dbHandler.getCollectionCount(); i++){
                Bundle data = dbHandler.getCollectionDetails();

                JSONObject jObject = new JSONObject();
                try {
                    jObject.put("cust_id", data.getString("cust_id"));
                    jObject.put("col_id", colId);
                    jObject.put("method", data.getString("method"));
                    jObject.put("amount", data.getInt("amount"));
                    jObject.put("check_no", data.getInt("cheq_no"));

                    json.put(jObject);

                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }                       
            }
            Log.d("Created JSON Array", json.toString());
            //sendJson("http://192.168.100.172/android/json_payments.php", json);
            UserFunctions userFunctions = new UserFunctions();
            userFunctions.syncCollections(json.toString());

            // TODO Auto-generated method stub
            return null;
        }



}

public JSONObject syncCollections(String jsonArray){

        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("collections", jsonArray));
        JSONObject json = jsonParser.getJSONFromUrl(sync_collections, params);

        Log.d("Sending JSON Array", jsonArray);

        return json;
    }

public JSONObject getJSONFromUrl(String url, List<NameValuePair> params) {

        // Making HTTP request
        try {
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            httpPost.setEntity(new UrlEncodedFormEntity(params));

            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    is, "utf-8"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
            is.close();
            json = sb.toString();
            Log.d("JSON", json);
        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
        }

        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }

        // return JSON String
        return jObj;

    }

public Bundle getCollectionDetails(){

        SQLiteDatabase db = this.getReadableDatabase();
        Bundle cursorData = new Bundle();
        String selectQuery = "SELECT * FROM " + TABLE_COLLECTION;
        Cursor cursor = db.rawQuery(selectQuery, null);
        if(cursor.moveToFirst()){
            cursorData.putString("cust_id", cursor.getString(cursor.getColumnIndex(KEY_CUSTOMER_ID)));
            if(cursor.getInt(cursor.getColumnIndex(KEY_CHEQ_NO)) == 0){
                cursorData.putString("method", "Cash");
            }else{
                cursorData.putString("method", "Cheque");
            }
            cursorData.putInt("amount", cursor.getInt(cursor.getColumnIndex(KEY_AMOUNT)));
            cursorData.putInt("cheq_no", cursor.getInt(cursor.getColumnIndex(KEY_CHEQ_NO)));
        }

        return cursorData;
    }

public int getCollectionCount(){
        String countQuery = "SELECT * FROM " + TABLE_COLLECTION;
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(countQuery, null);
        int rowCount = cursor.getCount();
        db.close();
        cursor.close();

        return rowCount;
    }

当“collection”表中只有一个条目时，它们似乎没有错误（如logcat中显示的“Sending JSON Array:”）。但是当有更多的条目时，logcat会给出以下错误

Logcat

02-25 10:12:05.660: E/AndroidRuntime(11394): FATAL EXCEPTION: AsyncTask #4
02-25 10:12:05.660: E/AndroidRuntime(11394): Process: collector.lbfinance, PID: 11394
02-25 10:12:05.660: E/AndroidRuntime(11394): java.lang.RuntimeException: An error occured while executing doInBackground()
02-25 10:12:05.660: E/AndroidRuntime(11394):    at android.os.AsyncTask$3.done(AsyncTask.java:300)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at java.util.concurrent.FutureTask.run(FutureTask.java:242)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at java.lang.Thread.run(Thread.java:841)
02-25 10:12:05.660: E/AndroidRuntime(11394): Caused by: java.lang.IllegalStateException: Cannot perform this operation because the connection pool has been closed.
02-25 10:12:05.660: E/AndroidRuntime(11394):    at android.database.sqlite.SQLiteConnectionPool.throwIfClosedLocked(SQLiteConnectionPool.java:962)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at android.database.sqlite.SQLiteConnectionPool.waitForConnection(SQLiteConnectionPool.java:599)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at android.database.sqlite.SQLiteConnectionPool.acquireConnection(SQLiteConnectionPool.java:348)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at android.database.sqlite.SQLiteSession.acquireConnection(SQLiteSession.java:894)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at android.database.sqlite.SQLiteSession.executeForCursorWindow(SQLiteSession.java:834)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at android.database.sqlite.SQLiteQuery.fillWindow(SQLiteQuery.java:62)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at android.database.sqlite.SQLiteCursor.fillWindow(SQLiteCursor.java:144)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at android.database.sqlite.SQLiteCursor.getCount(SQLiteCursor.java:133)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at collector.lbfinance.library.DatabaseHandler.getCollectionCount(DatabaseHandler.java:355)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at collector.lbfinance.AgentHome$SendCollections.doInBackground(AgentHome.java:273)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at collector.lbfinance.AgentHome$SendCollections.doInBackground(AgentHome.java:1)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at android.os.AsyncTask$2.call(AsyncTask.java:288)
02-25 10:12:05.660: E/AndroidRuntime(11394):    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
02-25 10:12:05.660: E/AndroidRuntime(11394):    ... 4 more

---

编辑方法GetCollectionDetails，如下所示

public Bundle getCollectionDetails(){

        SQLiteDatabase db = this.getReadableDatabase();
        Bundle cursorData = new Bundle();
        String selectQuery = "SELECT * FROM " + TABLE_COLLECTION;

        Cursor cursor = db.rawQuery(selectQuery, null);
        int no_of_rows=cursor.getCount();           //count the no of rows in the database
        String[] cust_id=new String[row_count]; 
        String[] method=new String[row_count] ;
        int[] amount=new int[row_count]    
        int[] cheq_no=new int[row_count]
        int i=0;

        if(cursor.moveToFirst()){
            cust_id[i]= cursor.getString(cursor.getColumnIndex(KEY_CUSTOMER_ID));
            if(cursor.getInt(cursor.getColumnIndex(KEY_CHEQ_NO)) == 0){
                method[i]="Cash";
            }else{
                mehod[i]="Cheque";
            }
            amount[i]= cursor.getInt(cursor.getColumnIndex(KEY_AMOUNT));
            cheq_no[i]= cursor.getInt(cursor.getColumnIndex(KEY_CHEQ_NO));
             i++;
        }
        cursorData.putStringArray("cust_id",cust_id);
         cursorData.putStringArray("method",method);
        cursorData.putIntArray("amount",amount);
         cursorData.putIntArray("cheq_no",cheq_no);
        return cursorData;
    }

然后在

MainActivity.java

中编写以下代码

int no_of_rows=dbHandler.getCollectionCount();
String[] cust_id=new String[row_count]; String[] method=new String[row_count] ; int[] amount=new int[row_count]
int[] cheq_no=new int[row_count] int i=0; Bundle data = dbHandler.getCollectionDetails(); cust_id=data.getStringArray("cust_id"); //simililarily retrive for others

for(int i = 0; i < dbHandler.getCollectionCount(); i++){ Bundle data = dbHandler.getCollectionDetails();

    JSONObject jObject = new JSONObject();
    try {
        jObject.put("cust_id", cust_id[i]);
        json.put(jObject);
    } catch (JSONException e) {
    // TODO Auto-generated catch block
        e.printStackTrace();
    }                       
}

int no_of_rows=dbHandler.getCollectionCount（）；
字符串[]客户id=新字符串[行计数]；字符串[]方法=新字符串[行计数]；整数[]金额=新整数[行计数]
int[]cheq_no=新int[行计数]int i=0；Bundle data=dbHandler.getCollectionDetails（）；cust_id=data.getStringArray（“cust_id”）//同样地为别人而努力
对于（int i=0；i

---

我希望这可以很好地为您服务。

在DatabaseHandler.java中，您只使用cursor.moveToFirst。只需要到您桌子的第一排。为什么不使用while（cursor.moveToNext）遍历所有行？哦，是的。一个简单的do{}while（cursor.moveToNext（））就可以了吗？我不明白你的问题。你能粗略估计一下你想要达到的目标吗。例如，数据库中有多少行，如果单击按钮，是选择某一行还是选择所有行？我将存储接收付款的详细信息。它可以是1或更多。用户通过单击“同步”按钮连接到网络时与数据库同步。我需要将详细信息发送到php文件。我要表格中所有列的所有行我已经给你提供了答案。查看这是否有效，如果有效，请接受答案。Eclipse在.putString中显示语法错误。cust\u id[i]=cursor.getString（cursor.getColumnIndex（KEY\u CUSTOMER\u id））应该是正确的方法，对吗？而且，这些不应该在里面做一段时间吗？看看它现在是否工作。顺便说一下，我还没有在eclipse上测试代码。我只是想给你一个逻辑。可能有一些编译错误。如果你还面临任何困难，请告诉我。谢谢。我明白为什么我的方法是愚蠢和错误的，这应该是可行的。但我仍然得到了以前的错误。即使是初始代码，它至少应该输出重复的代码，对吗？但是我（仍然，即使在将其更改为此）得到了与OPIt中所示相同的错误集，问题似乎是我试图从后台线程访问数据库。现在很好用。谢谢你的帮助，伙计，你太棒了