问题描述
我在使用帮手没有问题的复制数据库。但由于重新格式化我的电脑和安装Eclipse这一天,我只是不能照搬datbase了。也许模拟器的SD卡导致的问题。这里的日志猫说的话。
I have no problem copying database using helper. but since a re format my pc and install the eclipse this day I just can't copy the datbase anymore. maybe the sd card of emulator causing the problem. Here's what the log cat says.
14 07-23:23:48.875:E / AndroidRuntime(237):未捕获的处理程序:螺纹主力退出,由于未捕获的异常结果
07-23 14:23:48.885:E / AndroidRuntime(237):了java.lang.RuntimeException:无法启动活动ComponentInfo {com.frux.kfcmobile / com.frux.kfcmobile.KFCmobileActivity}:android.database.sqlite.SQLiteException :没有这样的表格:第一:,编译时:SELECT * FROM第一结果
07-23 14:23:48.885:E / AndroidRuntime(237):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在android.app.ActivityThread.access $ 2200(ActivityThread.java:119)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1863)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在android.os.Handler.dispatchMessage(Handler.java:99)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在android.os.Looper.loop(Looper.java:123)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在android.app.ActivityThread.main(ActivityThread.java:4363)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在java.lang.reflect.Method.invokeNative(本机方法)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在java.lang.reflect.Method.invoke(Method.java:521)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:860)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在dalvik.system.NativeStart.main(本机方法)结果
07-23 14:23:48.885:E / AndroidRuntime(237):android.database.sqlite.SQLiteException:没有这样的表:由最初引起:,编译时:SELECT * FROM第一结果
07-23 14:23:48.885:E / AndroidRuntime(237):在android.database.sqlite.SQLiteProgram.native_compile(本机方法)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在android.database.sqlite.SQLiteProgram.compile(SQLiteProgram.java:110)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在android.database.sqlite.SQLiteProgram(SQLiteProgram.java:59)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在android.database.sqlite.SQLiteQuery(SQLiteQuery.java:49)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:49)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1220)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1193)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在com.frux.kfcmobile.KFCmobileActivity.onCreate(KFCmobileActivity.java:42)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)结果
07-23 14:23:48.885:E / AndroidRuntime(237):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
下面是我的DBHelper
Here's My DBHelper
公共类DatabaseHelper扩展SQLiteOpenHelper {
public class DatabaseHelper extends SQLiteOpenHelper{
private static String DB_PATH = "/data/data/com.frux.kfcmobile/databases/";
private static String DB_NAME = "database";
private SQLiteDatabase myDataBase;
private final Context myContext;
private static final int DATABASE_VERSION = 1;
public DatabaseHelper(Context context) {
// TODO Auto-generated constructor stub
super(context, DB_NAME, null, DATABASE_VERSION);
this.myContext = context;
}
public void createDataBase() throws IOException{
boolean dbExist = checkDataBase();
if(dbExist){
//do nothing - database already exist
this.getWritableDatabase();
this.close();
}else{
//By calling this method and empty database will be created into the default system path
//of your application so we are gonna be able to overwrite that database with our database.
this.getReadableDatabase();
this.close();
try {
copyDataBase();
} catch (IOException e) {
//throw new Error("Error copying database message");
}
}
}
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}catch(SQLiteException e){
//database does't exist yet.
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
private void copyDataBase() throws IOException{
//Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException{
//Open the database
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if(myDataBase != null)
myDataBase.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
推荐答案
专注于以下行,不要忘了把 .sqlite
扩展:
Focus on below line, don't forget to put .sqlite
extension:
private static String DB_NAME = **"wfbos.sqlite";**
本线为我工作。
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