我正在尝试升级数据库。
在onUpgrade功能中，
1.从喜欢的数据库低版本表中提取喜欢的数据;
2.将喜欢的数据保存为“files / temp_favourite”中的查询（作为文件）;
3.删除数据库较低版本;
4.从资产文件夹插入数据库更高版本;
5.从最喜欢的数据库高级版表中的“files / temp_favourite”（作为文件）和database.execSQL（查询）中读取喜欢的数据作为查询;
我达到了1,2,3。我从4得到错误，不能进入5.中
主要错误：java.lang.IllegalStateException：递归调用getDatabase
这是Logcat：
11-30 09:50:45.610: D/gralloc_goldfish(16127): Emulator without GPU emulation detected.
11-30 09:51:03.950: D/dalvikvm(16127): GC_FOR_ALLOC freed 164K, 8% free 3058K/3292K, paused 129ms, total 193ms
11-30 09:51:03.960: I/dalvikvm-heap(16127): Grow heap (frag case) to 3.656MB for 635812-byte allocation
11-30 09:51:04.280: D/dalvikvm(16127): GC_FOR_ALLOC freed 10K, 7% free 3669K/3916K, paused 167ms, total 167ms
11-30 09:51:04.390: I/Choreographer(16127): Skipped 238 frames! The application may be doing too much work on its main thread.
11-30 09:51:04.890: I/Choreographer(16127): Skipped 110 frames! The application may be doing too much work on its main thread.
11-30 09:51:06.460: W/InputEventReceiver(16127): Attempted to finish an input event but the input event receiver has already been disposed.
11-30 09:51:20.830: I/createDatabase-dbExist:(16252): Database exists.
11-30 09:51:20.930: I/Databse Upgrade(16252): oldVersion=1,newVersion=2
11-30 09:51:20.930: I/Version(16252): higher version is found.
11-30 09:51:20.970: I/File(16252): favourite query file exprted.
11-30 09:51:20.970: I/File(16252): old database file deleted.
11-30 09:51:20.970: E/SQLiteLog(16252): (14) cannot open file at line 30191 of [00bb9c9ce4]
11-30 09:51:20.970: E/SQLiteLog(16252): (14) os_unix.c:30191: (2) open(/data/data/com.example.databaseupgrade/databases/Open3905Book) -
11-30 09:51:20.990: E/SQLiteDatabase(16252): Failed to open database '/data/data/com.example.databaseupgrade/databases/Open3905Book'.
11-30 09:51:20.990: E/SQLiteDatabase(16252): android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:804)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at com.example.databaseupgrade.util.DatabaseManager.checkDatabase(DatabaseManager.java:98)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at com.example.databaseupgrade.util.DatabaseManager.createDataBase(DatabaseManager.java:137)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at com.example.databaseupgrade.util.DatabaseManager.onUpgrade(DatabaseManager.java:69)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:257)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at com.example.databaseupgrade.impl.FavouriteServiceImpl.getFavourite(FavouriteServiceImpl.java:40)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at com.example.databaseupgrade.MainActivity.onCreate(MainActivity.java:37)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.app.Activity.performCreate(Activity.java:5243)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.app.ActivityThread.access$700(ActivityThread.java:135)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.os.Handler.dispatchMessage(Handler.java:102)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.os.Looper.loop(Looper.java:137)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at android.app.ActivityThread.main(ActivityThread.java:4998)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at java.lang.reflect.Method.invokeNative(Native Method)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at java.lang.reflect.Method.invoke(Method.java:515)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
11-30 09:51:20.990: E/SQLiteDatabase(16252): at dalvik.system.NativeStart.main(Native Method)
11-30 09:51:20.990: W/System.err(16252): android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
11-30 09:51:20.990: W/System.err(16252): at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
11-30 09:51:20.990: W/System.err(16252): at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209)
11-30 09:51:21.000: W/System.err(16252): at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193)
11-30 09:51:21.000: W/System.err(16252): at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
11-30 09:51:21.000: W/System.err(16252): at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
11-30 09:51:21.000: W/System.err(16252): at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
11-30 09:51:21.000: W/System.err(16252): at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:804)
11-30 09:51:21.000: W/System.err(16252): at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
11-30 09:51:21.000: W/System.err(16252): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
11-30 09:51:21.000: W/System.err(16252): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
11-30 09:51:21.000: W/System.err(16252): at com.example.databaseupgrade.util.DatabaseManager.checkDatabase(DatabaseManager.java:98)
11-30 09:51:21.000: W/System.err(16252): at com.example.databaseupgrade.util.DatabaseManager.createDataBase(DatabaseManager.java:137)
11-30 09:51:21.000: W/System.err(16252): at com.example.databaseupgrade.util.DatabaseManager.onUpgrade(DatabaseManager.java:69)
11-30 09:51:21.010: W/System.err(16252): at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:257)
11-30 09:51:21.010: W/System.err(16252): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)
11-30 09:51:21.010: W/System.err(16252): at com.example.databaseupgrade.impl.FavouriteServiceImpl.getFavourite(FavouriteServiceImpl.java:40)
11-30 09:51:21.010: W/System.err(16252): at com.example.databaseupgrade.MainActivity.onCreate(MainActivity.java:37)
11-30 09:51:21.010: W/System.err(16252): at android.app.Activity.performCreate(Activity.java:5243)
11-30 09:51:21.010: W/System.err(16252): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
11-30 09:51:21.010: W/System.err(16252): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140)
11-30 09:51:21.010: W/System.err(16252): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226)
11-30 09:51:21.010: W/System.err(16252): at android.app.ActivityThread.access$700(ActivityThread.java:135)
11-30 09:51:21.010: W/System.err(16252): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
11-30 09:51:21.010: W/System.err(16252): at android.os.Handler.dispatchMessage(Handler.java:102)
11-30 09:51:21.010: W/System.err(16252): at android.os.Looper.loop(Looper.java:137)
11-30 09:51:21.010: W/System.err(16252): at android.app.ActivityThread.main(ActivityThread.java:4998)
11-30 09:51:21.010: W/System.err(16252): at java.lang.reflect.Method.invokeNative(Native Method)
11-30 09:51:21.010: W/System.err(16252): at java.lang.reflect.Method.invoke(Method.java:515)
11-30 09:51:21.010: W/System.err(16252): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
11-30 09:51:21.010: W/System.err(16252): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
11-30 09:51:21.010: W/System.err(16252): at dalvik.system.NativeStart.main(Native Method)
11-30 09:51:21.050: D/AndroidRuntime(16252): Shutting down VM
11-30 09:51:21.050: W/dalvikvm(16252): threadid=1: thread exiting with uncaught exception (group=0xb3a36b90)
11-30 09:51:21.070: E/AndroidRuntime(16252): FATAL EXCEPTION: main
11-30 09:51:21.070: E/AndroidRuntime(16252): Process: com.example.databaseupgrade, PID: 16252
11-30 09:51:21.070: E/AndroidRuntime(16252): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.databaseupgrade/com.example.databaseupgrade.MainActivity}: java.lang.IllegalStateException: getDatabase called recursively
11-30 09:51:21.070: E/AndroidRuntime(16252): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2176)
11-30 09:51:21.070: E/AndroidRuntime(16252): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226)
11-30 09:51:21.070: E/AndroidRuntime(16252): at android.app.ActivityThread.access$700(ActivityThread.java:135)
11-30 09:51:21.070: E/AndroidRuntime(16252): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
11-30 09:51:21.070: E/AndroidRuntime(16252): at android.os.Handler.dispatchMessage(Handler.java:102)
11-30 09:51:21.070: E/AndroidRuntime(16252): at android.os.Looper.loop(Looper.java:137)
11-30 09:51:21.070: E/AndroidRuntime(16252): at android.app.ActivityThread.main(ActivityThread.java:4998)
11-30 09:51:21.070: E/AndroidRuntime(16252): at java.lang.reflect.Method.invokeNative(Native Method)
11-30 09:51:21.070: E/AndroidRuntime(16252): at java.lang.reflect.Method.invoke(Method.java:515)
11-30 09:51:21.070: E/AndroidRuntime(16252): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
11-30 09:51:21.070: E/AndroidRuntime(16252): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
11-30 09:51:21.070: E/AndroidRuntime(16252): at dalvik.system.NativeStart.main(Native Method)
11-30 09:51:21.070: E/AndroidRuntime(16252): Caused by: java.lang.IllegalStateException: getDatabase called recursively
11-30 09:51:21.070: E/AndroidRuntime(16252): at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:204)
11-30 09:51:21.070: E/AndroidRuntime(16252): at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:188)
11-30 09:51:21.070: E/AndroidRuntime(16252): at com.example.databaseupgrade.util.DatabaseManager.createDataBase(DatabaseManager.java:143)
11-30 09:51:21.070: E/AndroidRuntime(16252): at com.example.databaseupgrade.util.DatabaseManager.onUpgrade(DatabaseManager.java:69)
11-30 09:51:21.070: E/AndroidRuntime(16252): at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:257)
11-30 09:51:21.070: E/AndroidRuntime(16252): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)
11-30 09:51:21.070: E/AndroidRuntime(16252): at com.example.databaseupgrade.impl.FavouriteServiceImpl.getFavourite(FavouriteServiceImpl.java:40)
11-30 09:51:21.070: E/AndroidRuntime(16252): at com.example.databaseupgrade.MainActivity.onCreate(MainActivity.java:37)
11-30 09:51:21.070: E/AndroidRuntime(16252): at android.app.Activity.performCreate(Activity.java:5243)
11-30 09:51:21.070: E/AndroidRuntime(16252): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
11-30 09:51:21.070: E/AndroidRuntime(16252): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140)
11-30 09:51:21.070: E/AndroidRuntime(16252): ... 11 more
这是DatabaseManager.java：
package com.example.databaseupgrade.util;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.text.DateFormatSymbols;
import java.util.Arrays;
import java.util.Calendar;
import java.util.List;
import com.example.databaseupgrade.doa.FavouriteService;
import com.example.databaseupgrade.domain.Favourite;
import com.example.databaseupgrade.impl.FavouriteServiceImpl;
import android.content.Context;
import android.content.res.AssetManager;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DatabaseManager extends SQLiteOpenHelper {
private static final String DATABASE_PATH = "/data/data/com.example.databaseupgrade/databases/";
private static final String DATABASE_NAME = "Open3905Book";
private static final String CACHE_NAME="temp_favourite";
private static final int DATABASE_VERSION = 2;
private static final int SPLIT_NUMBER = 6;
private final Context context;
public DatabaseManager(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
this.context = context;
}
@Override
public void onCreate(SQLiteDatabase database) {
Log.i("onCreate:", "true");
try {
createDataBase();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.i("Databse Upgrade", "oldVersion=" + oldVersion + ",newVersion="
+ newVersion);
if (newVersion > oldVersion) {
Log.i("Version", "higher version is found.");
exportFavourite(db);
Log.i("File","favourite query file exprted.");
File file=new File(DATABASE_PATH+DATABASE_NAME);
file.delete();
Log.i("File", "old database file deleted.");
try {
createDataBase();
Log.i("Database", "created new database.");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// try {
// importFavourite(db);
// Log.i("File", "favourite query file imported.");
// } catch (SQLiteException e) {
// // TODO Auto-generated catch block
// e.printStackTrace();
// } catch (IOException e) {
// // TODO Auto-generated catch block
// e.printStackTrace();
// }
} else {
Log.i("Version", "lower version is found.");
}
}
public boolean checkDatabase() {
SQLiteDatabase checkDB = null;
try {
String fullPath = DATABASE_PATH + DATABASE_NAME;
checkDB = SQLiteDatabase.openDatabase(fullPath, null,
SQLiteDatabase.OPEN_READONLY);
} catch (SQLiteException e) {
e.printStackTrace();
}
if (checkDB != null) {
checkDB.close();
}
return checkDB != null ? true : false;
}
private void copyDataBase() throws IOException {
File DBFile = new File(DATABASE_PATH, DATABASE_NAME);
AssetManager am = context.getAssets();
OutputStream os = new FileOutputStream(DBFile);
DBFile.createNewFile();
byte[] b = new byte[1024];
int i, r;
String[] Files = am.list("");
Arrays.sort(Files);
for (i = 1; i < SPLIT_NUMBER + 1; i++) {
String fn = String.format("%d.bible", i);
if (Arrays.binarySearch(Files, fn) < 0)
break;
InputStream is = am.open(fn);
while ((r = is.read(b)) != -1)
os.write(b, 0, r);
is.close();
}
os.close();
}
public void createDataBase() throws IOException {
boolean dbExist = checkDatabase();
if (dbExist) {
// do nothing - database already exist
Log.i("createDatabase-dbExist:", "Database exists.");
} else {
this.getReadableDatabase();
try {
copyDataBase();
Log.i("createDatabase-copyDatabase:", "Copying database.");
} catch (IOException e) {
Log.w("Error-createDatabase-copyDatabase:",
"Error copying database");
throw new Error("Error copying database");
}
}
}
private void exportFavourite(SQLiteDatabase db) throws SQLiteException {
String sql = "SELECT * FROM favourite ORDER BY id DESC";
Cursor cursor = db.rawQuery(sql, null);
if (cursor.moveToFirst()) {
do {
String scripture=cursor.getString(1);
int bible_id=Integer.parseInt(cursor.getString(2));
String query="INSERT INTO favourite(scripture,bible_id,datetime) VALUES(\""+scripture+"\","+bible_id+",\""+getDateAndTime()+"\");";
try {
setQuerytoFile(query);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} while (cursor.moveToNext());
}
}
private void importFavourite(SQLiteDatabase db)throws SQLiteException, IOException{
String sql=getQueryfromFile();
db.execSQL(sql);
}
public void setQuerytoFile(String str) throws IOException {
FileOutputStream outputStream;
try {
outputStream = context.openFileOutput(CACHE_NAME, Context.MODE_APPEND);
outputStream.write(str.getBytes());
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public String getQueryfromFile() throws IOException{
FileInputStream inputStream;
String line = null;
try{
inputStream=context.openFileInput(CACHE_NAME);
InputStreamReader isr=new InputStreamReader(inputStream);
BufferedReader buffer=new BufferedReader(isr);
StringBuilder sb=new StringBuilder();
while((line=buffer.readLine())!=null){
sb.append(line);
}
}catch(Exception e){
e.printStackTrace();
}
return line;
}
public String getDateAndTime(){
Calendar c = Calendar.getInstance();
String str=c.get(Calendar.HOUR)+":"+c.get(Calendar.MINUTE)+" ";
if(c.get(Calendar.AM_PM)==0){
str+="AM ";
}else{
str+="PM ";
}
str+=c.get(Calendar.DATE);
String month="";
int num=c.get(Calendar.MONTH);
DateFormatSymbols dfs = new DateFormatSymbols();
String[] months = dfs.getMonths();
if (num >= 0 && num <= 11 ) {
month = months[num];
}
str+=month+" "+c.get(Calendar.YEAR);
return str;
}
}
实现4 OR 4和5的解决方案是什么？
答案 0 :(得分：1)
SQLiteOpenHelper假设您有一个数据库文件，其中包含您要保留的内容。
当onUpgrade正在运行时，数据库处于打开状态，并且事务处于活动状态。
您无法替换onUpgrade中的数据库文件。
如果要使用SQLiteOpenHelper，则必须通过执行SQL语句进行升级。
答案 1 :(得分：0)
请勿尝试删除onUpgrade()
而是使用drop table sql命令删除所有表
DROP TABLE IF EXISTS table_name
那是：
db.execSql( "DROP TABLE IF EXISTS table_name" );
表示数据库中的每个表。