我在SQLite数据库中存储了一些值，并尝试在按钮点击时将其发送到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;
}
}
我正在点击按钮执行AsyncTask。
UserFunctions.java
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;
}
JSONParser.java
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;
}
DatabaseHandler.java
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“集合”表中只有一个条目时，它们似乎没有错误（如在logcat中显示“发送JSON数组：”）。但是当有更多条目时，logcat会出现以下错误
logcat的
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
答案 0 :(得分：2)
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，您应该编写以下代码。
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();
}
}
我希望这对你有用..