我试图通过调用我在数据库类中创建的delete和insert方法来更新值。然而，正如我预期的那样，这是最好的工作。每当调用delete方法的活动将被执行并且给出空值时，并且当第二次再次调用该活动时，它将具有该值（我使用toast文本来获取值并用try和catch包围它将给出异常无效索引＃（数组列表索引为零，直到最后一个索引）大小为零）。但是，我正在使用asynctask执行此任务，这是我尝试做的：
@Override
protected Void doInBackground(Void... arg0) {
databaseMaster2=new DatabaseMaster2(MainActivity.this);
databaseMaster2.getWritableDatabase();
ServiceHandler sh = new ServiceHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);
jsonStr = jsonStr.replace(
"<?xml version=\"1.0\" encoding=\"utf-8\"?>", "");
jsonStr = jsonStr.replace("<string>", "");
jsonStr = jsonStr.replace("</string>", "");
// Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
Erates = jsonObj.getJSONArray(TAG_Erate);
Arates = jsonObj.getJSONArray(TAG_Arate);
Kondisis = jsonObj.getJSONArray(TAG_kondisi);
Zonas = jsonObj.getJSONArray(TAG_Zona);
tipeASs = jsonObj.getJSONArray(TAG_tipeAs);
// looping through All rates
for (int i = 0; i < Erates.length(); i++) {
JSONObject c = Erates.getJSONObject(i);
int id = c.getInt(TAG_ER_ID);
int tenor = c.getInt(TAG_ER_TENOR);
String ko = c.getString(TAG_ER_K);
String co = c.getString(TAG_ER_C);
double rate = c.getDouble(TAG_ER_RATE);
double ratedb = c.getDouble(TAG_ER_RATE_DB);
databaseMaster2.checkErates(id, tenor, ko, co, rate, ratedb);
if(databaseMaster2.checkErates(id, tenor, ko, co, rate, ratedb) == true){
databaseMaster2.deleteEntryEffectiveRate(id);
//databaseMaster2.saveEntryEffectiveRate(id, tenor,ko,co,
// rate,ratedb);
}
else {
databaseMaster2.saveEntryEffectiveRate(id, tenor,ko,co,rate,ratedb);
//databaseMaster2.deleteEntryAsuransiRate(id);
}
}
for (int i = 0; i < Arates.length(); i++) {
JSONObject c = Arates.getJSONObject(i);
int id = c.getInt(TAG_AS_ID);
int zona = c.getInt(TAG_AS_Z);
int tenor = c.getInt(TAG_AS_T);
double tlo = c.getDouble(TAG_AS_TLO);
double comp = c.getDouble(TAG_AS_Comp);
double comb = c.getDouble(TAG_AS_comb);
// Log.d("Response test: ", id + "\n" + zona + "\n"
// + tenor + "\n" + tlo + "\n" + comp + "\n"
// + comb);
databaseMaster2.checkArates(id, zona, tenor, tlo, comp, comb);
if(databaseMaster2.checkArates(id, zona, tenor, tlo, comp, comb) == true){
databaseMaster2.deleteEntryAsuransiRate(id);
}
else {
databaseMaster2.saveEntryAsuransiRate(id, zona, tenor, tlo, comp, comb);
}
}
for (int i = 0; i < Kondisis.length(); i++) {
JSONObject c = Kondisis.getJSONObject(i);
int id = 0;
String ko = c.getString(TAG_K);
String co = c.getString(TAG_C);
// Log.d("Response test1: ", ko + "\n" + co);
databaseMaster2.checkKondisi(ko, co);
if(databaseMaster2.checkKondisi(ko,co) == true){
databaseMaster2.deleteKondisi(id);
}
else {
databaseMaster2.saveKondisi(ko, co);
}
}
for (int i = 0; i < Zonas.length(); i++) {
JSONObject c = Zonas.getJSONObject(i);
int id = 0;
String Za = c.getString(TAG_Za);
String Ze = c.getString(TAG_Ze);
// Log.d("Response test1: ", Za + "\n" + Ze);
databaseMaster2.checkZona(Za, Ze);
if(databaseMaster2.checkZona(Za, Ze) == true){
databaseMaster2.deleteZona(id);
}
else {
databaseMaster2.saveZona(Za, Ze);
}
}
for (int i = 0; i < tipeASs.length(); i++) {
JSONObject c = tipeASs.getJSONObject(i);
int id = 0;
String Ty = c.getString(TAG_Ty);
// Log.d("Response test1: ", Ty);
databaseMaster2.checkType(Ty);
if(databaseMaster2.checkType(Ty) == true){
databaseMaster2.deleteType(id);
}
else {
databaseMaster2.saveTipeAsuransi(Ty);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
我在数据库类中使用的方法（名为DatabaseMaster2）： 例如：
public void deleteEntryEffectiveRate(long er_id) throws SQLException{
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_EFFECTIVE_RATE, KEY_ER_ID + " = ?",
new String[] { String.valueOf(er_id) });
}
public void saveEntryEffectiveRate(int id, int tenor,String ko,String co, double rate,
double ratedb) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues valuesER = new ContentValues();
valuesER.put(KEY_ER_ID, id);
valuesER.put(KEY_ER_TENOR, tenor);
valuesER.put(KEY_ER_KO, ko);
valuesER.put(KEY_ER_CO, co);
valuesER.put(KEY_ER_RATE, rate);
valuesER.put(KEY_ER_RATE_DB, ratedb);
db.insert(TABLE_EFFECTIVE_RATE, null, valuesER);
}
并在此处调用：
for (int i = 0; i < Erates.length(); i++) {
JSONObject c = Erates.getJSONObject(i);
int id = c.getInt(TAG_ER_ID);
int tenor = c.getInt(TAG_ER_TENOR);
String ko = c.getString(TAG_ER_K);
String co = c.getString(TAG_ER_C);
double rate = c.getDouble(TAG_ER_RATE);
double ratedb = c.getDouble(TAG_ER_RATE_DB);
databaseMaster2.checkErates(id, tenor, ko, co, rate, ratedb);
if(databaseMaster2.checkErates(id, tenor, ko, co, rate, ratedb) == true){
databaseMaster2.deleteEntryEffectiveRate(id);
}
else {
databaseMaster2.saveEntryEffectiveRate(id, tenor,ko,co,rate,ratedb);
}
}
然后检查行是否为空：
public boolean checkErates(int id, int tenor,String ko,String co, double rate,
double ratedb)
{
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_EFFECTIVE_RATE,
new String[] { KEY_ER_ID,KEY_ER_KO,KEY_ER_CO,KEY_ER_RATE,KEY_ER_RATE_DB },
KEY_ER_ID + " = ? and " + KEY_ER_TENOR + " = ? and "+ KEY_ER_KO + " = ? and " + KEY_ER_CO + " = ? and " + KEY_ER_RATE + " = ? and " + KEY_ER_RATE_DB + " = ?" ,
new String[] {String.valueOf(id),String.valueOf(tenor),ko,co,String.valueOf(rate),String.valueOf(ratedb)},
null, null, null, null);
if(cursor.moveToFirst()){
return true;
}//row exists
else {
return false;
}
}
Logcat for 2nd problem：
04-27 09:57:30.280: E/Database(1018): close() was never explicitly called on database '/data/data/www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom/databases/Rates'
04-27 09:57:30.280: E/Database(1018): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
04-27 09:57:30.280: E/Database(1018): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1827)
04-27 09:57:30.280: E/Database(1018): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:820)
04-27 09:57:30.280: E/Database(1018): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:854)
04-27 09:57:30.280: E/Database(1018): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:847)
04-27 09:57:30.280: E/Database(1018): at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:541)
04-27 09:57:30.280: E/Database(1018): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
04-27 09:57:30.280: E/Database(1018): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:118)
04-27 09:57:30.280: E/Database(1018): at www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom.MainActivity$GetDatas.doInBackground(MainActivity.java:530)
04-27 09:57:30.280: E/Database(1018): at www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom.MainActivity$GetDatas.doInBackground(MainActivity.java:1)
04-27 09:57:30.280: E/Database(1018): at android.os.AsyncTask$2.call(AsyncTask.java:185)
04-27 09:57:30.280: E/Database(1018): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
04-27 09:57:30.280: E/Database(1018): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
04-27 09:57:30.280: E/Database(1018): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
04-27 09:57:30.280: E/Database(1018): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
04-27 09:57:30.280: E/Database(1018): at java.lang.Thread.run(Thread.java:1019)
04-27 09:57:30.310: E/Database(1018): close() was never explicitly called on database '/data/data/www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom/databases/Rates'
04-27 09:57:30.310: E/Database(1018): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
04-27 09:57:30.310: E/Database(1018): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1827)
04-27 09:57:30.310: E/Database(1018): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:820)
04-27 09:57:30.310: E/Database(1018): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:854)
04-27 09:57:30.310: E/Database(1018): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:847)
04-27 09:57:30.310: E/Database(1018): at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:541)
04-27 09:57:30.310: E/Database(1018): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
04-27 09:57:30.310: E/Database(1018): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:118)
04-27 09:57:30.310: E/Database(1018): at www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom.MainActivity$GetDatas.doInBackground(MainActivity.java:530)
04-27 09:57:30.310: E/Database(1018): at www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom.MainActivity$GetDatas.doInBackground(MainActivity.java:1)
04-27 09:57:30.310: E/Database(1018): at android.os.AsyncTask$2.call(AsyncTask.java:185)
04-27 09:57:30.310: E/Database(1018): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
04-27 09:57:30.310: E/Database(1018): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
04-27 09:57:30.310: E/Database(1018): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
04-27 09:57:30.310: E/Database(1018): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
04-27 09:57:30.310: E/Database(1018): at java.lang.Thread.run(Thread.java:1019)
然后我放DatabaseMaster2.closeDB();
封闭的方法：
public void closeDB() {
SQLiteDatabase db = this.getReadableDatabase();
if (db != null && db.isOpen())
db.close();
}
logcat发生了变化：
04-27 11:07:51.170: D/dalvikvm(1604): GC_EXTERNAL_ALLOC freed 68K, 52% free 2624K/5379K, external 1625K/2137K, paused 64ms
04-27 11:07:56.670: D/dalvikvm(1604): GC_EXTERNAL_ALLOC freed 6K, 51% free 2641K/5379K, external 10738K/10738K, paused 43ms
04-27 11:08:00.120: W/dalvikvm(1604): threadid=9: thread exiting with uncaught exception (group=0x40015560)
04-27 11:08:00.140: E/AndroidRuntime(1604): FATAL EXCEPTION: AsyncTask #1
04-27 11:08:00.140: E/AndroidRuntime(1604): java.lang.RuntimeException: An error occured while executing doInBackground()
04-27 11:08:00.140: E/AndroidRuntime(1604): at android.os.AsyncTask$3.done(AsyncTask.java:200)
04-27 11:08:00.140: E/AndroidRuntime(1604): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
04-27 11:08:00.140: E/AndroidRuntime(1604): at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
04-27 11:08:00.140: E/AndroidRuntime(1604): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
04-27 11:08:00.140: E/AndroidRuntime(1604): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
04-27 11:08:00.140: E/AndroidRuntime(1604): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
04-27 11:08:00.140: E/AndroidRuntime(1604): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
04-27 11:08:00.140: E/AndroidRuntime(1604): at java.lang.Thread.run(Thread.java:1019)
04-27 11:08:00.140: E/AndroidRuntime(1604): Caused by: java.lang.NullPointerException
04-27 11:08:00.140: E/AndroidRuntime(1604): at www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom.DatabaseMaster2.close(DatabaseMaster2.java:473)
04-27 11:08:00.140: E/AndroidRuntime(1604): at www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom.MainActivity$GetDatas.doInBackground(MainActivity.java:591)
04-27 11:08:00.140: E/AndroidRuntime(1604): at www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom.MainActivity$GetDatas.doInBackground(MainActivity.java:1)
04-27 11:08:00.140: E/AndroidRuntime(1604): at android.os.AsyncTask$2.call(AsyncTask.java:185)
04-27 11:08:00.140: E/AndroidRuntime(1604): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
04-27 11:08:00.140: E/AndroidRuntime(1604): ... 4 more
04-27 11:08:03.281: E/WindowManager(1604): Activity www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4050a8e8 that was originally added here
04-27 11:08:03.281: E/WindowManager(1604): android.view.WindowLeaked: Activity www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4050a8e8 that was originally added here
04-27 11:08:03.281: E/WindowManager(1604): at android.view.ViewRoot.<init>(ViewRoot.java:258)
04-27 11:08:03.281: E/WindowManager(1604): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
04-27 11:08:03.281: E/WindowManager(1604): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
04-27 11:08:03.281: E/WindowManager(1604): at android.view.Window$LocalWindowManager.addView(Window.java:424)
04-27 11:08:03.281: E/WindowManager(1604): at android.app.Dialog.show(Dialog.java:241)
04-27 11:08:03.281: E/WindowManager(1604): at www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom.MainActivity$GetDatas.onPreExecute(MainActivity.java:447)
04-27 11:08:03.281: E/WindowManager(1604): at android.os.AsyncTask.execute(AsyncTask.java:391)
04-27 11:08:03.281: E/WindowManager(1604): at www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom.MainActivity.onCreate(MainActivity.java:201)
04-27 11:08:03.281: E/WindowManager(1604): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-27 11:08:03.281: E/WindowManager(1604): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1586)
04-27 11:08:03.281: E/WindowManager(1604): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1638)
04-27 11:08:03.281: E/WindowManager(1604): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
04-27 11:08:03.281: E/WindowManager(1604): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:928)
04-27 11:08:03.281: E/WindowManager(1604): at android.os.Handler.dispatchMessage(Handler.java:99)
04-27 11:08:03.281: E/WindowManager(1604): at android.os.Looper.loop(Looper.java:123)
04-27 11:08:03.281: E/WindowManager(1604): at android.app.ActivityThread.main(ActivityThread.java:3647)
04-27 11:08:03.281: E/WindowManager(1604): at java.lang.reflect.Method.invokeNative(Native Method)
04-27 11:08:03.281: E/WindowManager(1604): at java.lang.reflect.Method.invoke(Method.java:507)
04-27 11:08:03.281: E/WindowManager(1604): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-27 11:08:03.281: E/WindowManager(1604): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-27 11:08:03.281: E/WindowManager(1604): at dalvik.system.NativeStart.main(Native Method)
04-27 11:08:06.130: I/Process(1604): Sending signal. PID: 1604 SIG: 9
我把closeDB();放在这里:(在一个for循环然后在所有for循环上，logcat是相同的）
for (int i = 0; i < Erates.length(); i++) {
JSONObject c = Erates.getJSONObject(i);
int id = c.getInt(TAG_ER_ID);
int tenor = c.getInt(TAG_ER_TENOR);
String ko = c.getString(TAG_ER_K);
String co = c.getString(TAG_ER_C);
double rate = c.getDouble(TAG_ER_RATE);
double ratedb = c.getDouble(TAG_ER_RATE_DB);
databaseMaster2.checkErates(id, tenor, ko, co, rate, ratedb);
if(databaseMaster2.checkErates(id, tenor, ko, co, rate, ratedb) == true){
databaseMaster2.deleteEntryEffectiveRate(id);
}
else {
databaseMaster2.saveEntryEffectiveRate(id, tenor,ko,co,rate,ratedb);
}
databaseMaster2.closeDB();
}
问题：
closeDB();或Close();？注意：解析JSON工作得很好。如果你问我确定，答案肯定是肯定的。证明here
UPDATE问题1：删除和插入也工作得很好，我想要做的是删除如果行是空的然后插入，否则它将插入（如果它已经是空的）。但它碰巧删除了第一个活动，然后调用给出空值，当我关闭活动并再次调用它时，它将运行将插入数据的else条件。问题是当用户运行应用程序两次时，如果用户只运行1次没有值，那么值就会存在。
更新问题2：尝试根据答案执行此操作：
for (int i = 0; i < Erates.length(); i++) {
JSONObject c = Erates.getJSONObject(i);
int id = c.getInt(TAG_ER_ID);
int tenor = c.getInt(TAG_ER_TENOR);
String ko = c.getString(TAG_ER_K);
String co = c.getString(TAG_ER_C);
double rate = c.getDouble(TAG_ER_RATE);
double ratedb = c.getDouble(TAG_ER_RATE_DB);
boolean boolCheckErates = databaseMaster2.checkErates(
id, tenor, ko, co, rate, ratedb);
// close connection here
databaseMaster2.closeDB();
if (boolCheckErates) {
databaseMaster2.deleteEntryEffectiveRate(id);
// close connection here
databaseMaster2.closeDB();
} else {
databaseMaster2.saveEntryEffectiveRate(id, tenor,
ko, co, rate, ratedb);
// close connection here
databaseMaster2.closeDB();
}
}
在多次重新运行应用程序后，它会出错：
04-27 10:57:14.000: E/Database(1451): close() was never explicitly called on database '/data/data/www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom/databases/Rates'
04-27 10:57:14.000: E/Database(1451): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
04-27 10:57:14.000: E/Database(1451): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1827)
04-27 10:57:14.000: E/Database(1451): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:820)
04-27 10:57:14.000: E/Database(1451): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:854)
04-27 10:57:14.000: E/Database(1451): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:847)
04-27 10:57:14.000: E/Database(1451): at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:541)
04-27 10:57:14.000: E/Database(1451): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
04-27 10:57:14.000: E/Database(1451): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:118)
04-27 10:57:14.000: E/Database(1451): at www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom.MainActivity$GetDatas.doInBackground(MainActivity.java:531)
04-27 10:57:14.000: E/Database(1451): at www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom.MainActivity$GetDatas.doInBackground(MainActivity.java:1)
04-27 10:57:14.000: E/Database(1451): at android.os.AsyncTask$2.call(AsyncTask.java:185)
04-27 10:57:14.000: E/Database(1451): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
04-27 10:57:14.000: E/Database(1451): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
04-27 10:57:14.000: E/Database(1451): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
04-27 10:57:14.000: E/Database(1451): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
04-27 10:57:14.000: E/Database(1451): at java.lang.Thread.run(Thread.java:1019)
04-27 10:57:14.040: E/Database(1451): close() was never explicitly called on database '/data/data/www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom/databases/Rates'
04-27 10:57:14.040: E/Database(1451): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
04-27 10:57:14.040: E/Database(1451): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1827)
04-27 10:57:14.040: E/Database(1451): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:820)
04-27 10:57:14.040: E/Database(1451): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:854)
04-27 10:57:14.040: E/Database(1451): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:847)
04-27 10:57:14.040: E/Database(1451): at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:541)
04-27 10:57:14.040: E/Database(1451): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
04-27 10:57:14.040: E/Database(1451): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:118)
04-27 10:57:14.040: E/Database(1451): at www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom.MainActivity$GetDatas.doInBackground(MainActivity.java:531)
04-27 10:57:14.040: E/Database(1451): at www.mandiritunasfinancemobile.co.id.a1s2d3f4g5h6j7k8l9.p0.comcom.MainActivity$GetDatas.doInBackground(MainActivity.java:1)
04-27 10:57:14.040: E/Database(1451): at android.os.AsyncTask$2.call(AsyncTask.java:185)
04-27 10:57:14.040: E/Database(1451): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
04-27 10:57:14.040: E/Database(1451): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
04-27 10:57:14.040: E/Database(1451): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
04-27 10:57:14.040: E/Database(1451): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
04-27 10:57:14.040: E/Database(1451): at java.lang.Thread.run(Thread.java:1019)
问题1：我想在删除之前插入else条件，是否可能？
更新问题1 我试试这个并且失败了
for (int i = 0; i < Erates.length(); i++) {
JSONObject c = Erates.getJSONObject(i);
int id = c.getInt(TAG_ER_ID);
int tenor = c.getInt(TAG_ER_TENOR);
String ko = c.getString(TAG_ER_K);
String co = c.getString(TAG_ER_C);
double rate = c.getDouble(TAG_ER_RATE);
double ratedb = c.getDouble(TAG_ER_RATE_DB);
boolean boolCheckErates = databaseMaster2.checkErates(
id, tenor, ko, co, rate, ratedb);
// close connection here
databaseMaster2.closeDB();
if (boolCheckErates) {
databaseMaster2.deleteEntryEffectiveRate(id);
// close connection here
databaseMaster2.closeDB();
databaseMaster2.saveEntryEffectiveRate(id, tenor,
ko, co, rate, ratedb);
databaseMaster2.closeDB();
} else {
databaseMaster2.saveEntryEffectiveRate(id, tenor,
ko, co, rate, ratedb);
// close connection here
databaseMaster2.closeDB();
}
}
然后这个：
for (int i = 0; i < Erates.length(); i++) {
JSONObject c = Erates.getJSONObject(i);
int id = c.getInt(TAG_ER_ID);
int tenor = c.getInt(TAG_ER_TENOR);
String ko = c.getString(TAG_ER_K);
String co = c.getString(TAG_ER_C);
double rate = c.getDouble(TAG_ER_RATE);
double ratedb = c.getDouble(TAG_ER_RATE_DB);
boolean boolCheckErates = databaseMaster2.checkErates(
id, tenor, ko, co, rate, ratedb);
// close connection here
databaseMaster2.closeDB();
if (boolCheckErates) {
databaseMaster2.deleteEntryEffectiveRate(id);
// close connection here
databaseMaster2.closeDB();
DatabaseMaster2 databaseMaster3 = new DatabaseMaster2(MainActivity.this);
databaseMaster3.getWritableDatabase();
databaseMaster3.saveEntryEffectiveRate(id, tenor,
ko, co, rate, ratedb);
databaseMaster3.closeDB();
} else {
databaseMaster2.saveEntryEffectiveRate(id, tenor,
ko, co, rate, ratedb);
// close connection here
databaseMaster2.closeDB();
}
}
第一次运行顺利然后经过几次（2-7次）重新运行后仍然会出现相同的错误，说从未明确调用close。知道为什么会发生这种情况吗？我只想避免在真实设备上安装应用程序时应用程序崩溃
答案 0 :(得分：2)
需要正确关闭连接，因为执行新查询。当前实现正试图执行多个查询。
目前多次调用checkErates方法，这不是必需的：
boolean boolCheckErates=databaseMaster2.checkErates(id, tenor,
ko, co, rate, ratedb);
// close connection here
databaseMaster2.closeDB();
if(boolCheckErates){
databaseMaster2.deleteEntryEffectiveRate(id);
// close connection here
databaseMaster2.closeDB();
}else{
databaseMaster2.saveEntryEffectiveRate(id, tenor,ko,co,rate,ratedb);
// close connection here
databaseMaster2.closeDB();
}