android에서 assets 폴더에 저장된 데이터베이스에서 데이터를 가져 오는 방법

Question

SQLite 데이터베이스 브라우저를 사용하여 데이터베이스를 생성하고 프로젝트의 assets 폴더에 저장했습니다. 나는

03-28 01:07:39.840: E/AndroidRuntime(7390): FATAL EXCEPTION: main 
03-28 01:07:39.840: E/AndroidRuntime(7390): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.pocketdr/com.example.pocketdr.PocketDoc}: android.database.sqlite.SQLiteException: near "/": syntax error: , while compiling: /data/data/com.example.pocketdr/databases/Diseases.db/Diseaseslist/ 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1872) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1893) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.app.ActivityThread.access$1500(ActivityThread.java:135) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1054) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.os.Handler.dispatchMessage(Handler.java:99) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.os.Looper.loop(Looper.java:150) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.app.ActivityThread.main(ActivityThread.java:4385) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at java.lang.reflect.Method.invokeNative(Native Method) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at java.lang.reflect.Method.invoke(Method.java:507) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at dalvik.system.NativeStart.main(Native Method) 
03-28 01:07:39.840: E/AndroidRuntime(7390): Caused by: android.database.sqlite.SQLiteException: near "/": syntax error: , while compiling: /data/data/com.example.pocketdr/databases/Diseases.db/Diseaseslist/ 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:92) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:65) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:73) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:49) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:53) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1442) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1410) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at com.example.pocketdr.Database.getSymptom(Database.java:215) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at com.example.pocketdr.PocketDoc.onCreate(PocketDoc.java:60) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1072) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1836) 
03-28 01:07:39.840: E/AndroidRuntime(7390):  ... 11 more 

DATABASE 헬퍼 클래스의 표시 오류 해당 폴더에서 데이터를 가져 오기 위해 노력하고있어 때

public class Database extends SQLiteOpenHelper{ 
private static String DB_PATH = "/data/data/com.example.pocketdr/databases/"; 
private static final String DB_NAME = "Diseases.db"; 
private static final int DB_VERSION_NUMBER = 1; 
public static final String DB_TABLE_NAME = "Diseaseslist"; 
private static final String _ID="id"; 
public static final String COLUMN_1_NAME = "Name"; 
private static final String COLUMN_2_Symptom="Symptom"; 
private static final String COLUMN_3_Symptom1="Symptom1"; 
private static final String COLUMN_4_Symptom2="Symptom2"; 
private static final String COLUMN_5_Symptom3="Symptom3"; 
private static final String COLUMN_6_Discription="Discription"; 
private static final String COLUMN_7_Precaution="Precaution"; 
String[] str,str1,str2; 



private SQLiteDatabase sqliteDBInstance ; 
private final Context myContext; 
public Database(Context context) { 
    super(context, DB_NAME, null, DB_VERSION_NUMBER); 
    this.myContext = context; 
} 

public void createDataBase() throws IOException 
{ 

    boolean dbExist = checkDataBase(); 

    if(dbExist){ 
    //do nothing - database already exist 
    }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(); 

    try { 

    copyDataBase(); 

    } catch (IOException e) { 

    throw new Error("Error copying database"); 

    } 
    } 

    } 

    /** 
     * Check if the database already exist to avoid re-copying the file each time you open the application. 
     * @return true if it exists, false if it doesn't 
     */ 
    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; 
    } 

    /** 
     * Copies your database from your local assets-folder to the just created empty database in the 
     * system folder, from where it can be accessed and handled. 
     * This is done by transfering bytestream. 
     * */ 
    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; 
    sqliteDBInstance = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY); 

    } 

    @Override 
    public synchronized void close() { 

    if(sqliteDBInstance != null) 
    sqliteDBInstance.close(); 

    super.close(); 

    } 


@Override 
public void onCreate(SQLiteDatabase sqliteDBInstance) { 

    // TODO Auto-generated method stub 



} 

@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
    // TODO Auto-generated method stub 

} 

    public long insertDiseases(String Name,String Symptom,String Symptom1,String Symptom2,String Symptom3,String Description, String Precaution) 
    { 
     ContentValues contentValues = new ContentValues(); 
     contentValues.put(COLUMN_1_NAME, Name); 
     contentValues.put(COLUMN_2_Symptom, Symptom); 
     contentValues.put(COLUMN_3_Symptom1, Symptom1); 
     contentValues.put(COLUMN_4_Symptom2, Symptom2); 
     contentValues.put(COLUMN_5_Symptom3, Symptom3); 
     contentValues.put(COLUMN_6_Discription, Description); 
     contentValues.put(COLUMN_7_Precaution, Precaution); 
     Log.i(this.toString() + " - insertCountry", "Inserting: " + Name); 
     return this.sqliteDBInstance.insert(DB_TABLE_NAME, null, contentValues); 
    } 

    public boolean removeDiseases(String Name) 
    { 
     int result = this.sqliteDBInstance.delete(DB_TABLE_NAME, "Name='" + Name + "'", null); 

     if(result > 0) 
      return true; 
     else 
      return false; 
    } 

    public long updateCountry(String oldName, String newName) 
    { 
     ContentValues contentValues = new ContentValues(); 
     contentValues.put(COLUMN_1_NAME, newName); 
     return this.sqliteDBInstance.update(DB_TABLE_NAME, contentValues, "Name='" + oldName + "'", null); 
    } 

    public String[] getSymptom() 
    { 
     String myPath1 = DB_PATH + DB_NAME+"/"+DB_TABLE_NAME+"/" ; 

    Cursor cursor = this.sqliteDBInstance.rawQuery(myPath1, new String[]{COLUMN_2_Symptom});//query(myPath1, new String[] {COLUMN_2_Symptom}, null, null, null, null, null); 
Log.i(COLUMN_2_Symptom, "Symptom"+cursor); 
     if(cursor.getCount() >0) 
     { 
      str = new String[cursor.getCount()]; 
      int i = 0; 

      while (cursor.moveToNext()) 
      { 
       str[i] = cursor.getString(cursor.getColumnIndex(COLUMN_2_Symptom)); 
       i++; 
      } 

      return str; 
     } 
     else 
     { 
      return new String[] {}; 
     } 
    } 

Answer 1

public String[] getSymptom() 
    { 
     String myPath1 = DB_PATH + DB_NAME+"/"+DB_TABLE_NAME+"/" ; 

    Cursor cursor = this.sqliteDBInstance.rawQuery(myPath1, new String[]{COLUMN_2_Symptom}); 
    } 

귀하의 문자열 myPath1 유효한 SQLite는 쿼리하지를 데이터베이스 테이블에 경로를 포함해야 .

같은 시도 "your_tablename에서 선택 * 어디 COLUMN_NAME = 값"

또는 대신 rawQuery의 쿼리를 사용할 수 있습니다. this