如何从数据库中获取数据存储在资产文件夹中android

我已经使用SQLite数据库浏览器创建了我的数据库，并将其存储到我的项目中的assets文件夹中。当我试图从该文件夹取数据的示值误差如何从数据库中获取数据存储在资产文件夹中android

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助手类

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[] {}; 
     } 
    }

来源

2013-03-27 user1922355

可以发布数据库帮助吗？ – 2013-03-27 19:55:01

如果您使用的是较旧的Android版本（<= Android 2.2），则存在一个已知的完整路径问题（请参阅http://stackoverflow.com/questions/5332328/sqliteopenhelper-problem-with-fully-qualified-db-路径名）。你使用什么版本？附：你的变量'String myPath1 = ...'可能是错误的。 – Trinimon 2013-03-27 20:37:29

我使用的是Android 2.3.5版本 – user1922355 2013-03-27 20:43:22

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

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

您的字符串myPath1应包含一个有效的SQLite查询不是路径数据库表。

尝试像“从your_tablename选择*如果列名=值”

，或者您可以使用查询，而不是rawQuery。请参阅this

来源

2013-03-27 20:54:09

如何从数据库中获取数据存储在资产文件夹中android

回答

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