本文介绍了错误复制数据库的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

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。

这篇关于错误复制数据库的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-21 08:47