从SQLite读取数据android

Iam使用SQLite数据库开发一个应用程序我可以存储和读取数据，但我的问题是我只能读取最近的表插入数据，但我无法读取以前的数据，我添加了我的插入值表和读取表值，请解决我的问题从SQLite读取数据android

Mycode 

DBHandler class 

    public abstract class DBHandler { 
private int version; 
private String database; 
private String logTag; 

private DBGen dbGen; 

@SuppressWarnings("unused") 
private DBHandler(){} 

public DBHandler(Context context, String database, int version, String logTag){ 
    this.database=database; 
    this.version=version; 
    this.logTag=logTag; 

    dbGen = DBGen.getInstance(context, this); 
} 

public String getDatabase() { 
    return database; 
} 

public void setDatabase(String database) { 
    this.database = database; 
} 

public int getVersion() { 
    return version; 
} 

public void setVersion(int version) { 
    this.version = version; 
} 

public String getLogTag() { 
    return logTag; 
} 

public void setLogTag(String logTag) { 
    this.logTag = logTag; 
} 

public SQLiteDatabase getReadDB(){ 
    return dbGen.open(); 
} 

public SQLiteDatabase getWriteDB(){ 
    return dbGen.open(); 
} 

public void close(){ 
    try{ 
     dbGen.close(); 
    } 
    catch(SQLException sqlEx){ 
     Log.e(logTag, "Exception while closing connection",sqlEx); 
    } 
} 

public abstract void onCreate(SQLiteDatabase db); 
public abstract void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion); 
    } 


MY read data 

    public ArrayList<UserDetailsDTO> getUserDetails(){ 

    Cursor cursor = null; 

    try{ 

     String query = "SELECT * FROM " +UserDBHandler.USER_TABLE; 

     cursor = myDB.rawQuery(query, null); 

     if(cursor.moveToFirst()){ 
      List<UserDetailsDTO> comb_Off_Jobs = new 
     ArrayList<UserDetailsDTO>(); 

      do{ 
       UserDetailsDTO comb_off_job = new UserDetailsDTO(); 


          comb_off_job.setUserName(cursor.getString(cursor.getColumnIndexOrThrow(UserDBHandler.USER_NAME))); 
       comb_off_job.setPassword(cursor.getString(cursor.getColumnIndexOrThrow(UserDBHandler.PASSWORD))); 
       comb_off_job.setConfirmPassword(cursor.getString(cursor.getColumnIndexOrThrow(UserDBHandler.CONFIRM_PASSWORD))); 
       comb_off_job.setMobileNumber(cursor.getString(cursor.getColumnIndexOrThrow(UserDBHandler.USER_MOBILE_NUMBER))); 

       comb_Off_Jobs.add(comb_off_job); 

      } 
      while(cursor.moveToNext()); 

      return (ArrayList<UserDetailsDTO>)comb_Off_Jobs; 
     }   
    } 
    catch(IllegalArgumentException e){ 
     e.printStackTrace(); 
    } 
    finally{ 
     if(cursor!=null){ 
      cursor.close(); 
     } 
    } 
    return null; 

} 

    my insert data 

    public long insertUserDetails(UserDetailsDTO userDetails) { 

    ContentValues contentValues = new ContentValues(); 
    contentValues.put(UserDBHandler.USER_NAME, userDetails.getUserName()); 
    contentValues.put(UserDBHandler.PASSWORD, userDetails.getPasssword()); 
    contentValues.put(UserDBHandler.CONFIRM_PASSWORD, 
    userDetails.getConfirmPassword()); 

    contentValues.put(UserDBHandler.USER_MOBILE_NUMBER,userDetails.getMobileNumber()); 


    return myDB.insert(UserDBHandler.USER_TABLE, null, 
      contentValues); 

}

来源

2014-01-08 Durga

选择似乎很好。你能分享你的插入代码吗？你可能会在某处意外地删除/清除表。 – Satya

什么是对象myDB？你能分享你的代码吗？ – blay

看到我的代码，我加了DBHandler类也 – Durga

检查此条件

if (cursor.getCount() > 0) { 
    cursor.moveToFirst(); 
    do { 

    } while (cursor.moveToNext()); 
}

只是这一个

取代你getUserDetails功能

public ArrayList<UserDetailsDTO> getUserDetails(){ 

Cursor cursor = null; 

try{ 

    String query = "SELECT * FROM " +UserDBHandler.USER_TABLE; 

    cursor = myDB.rawQuery(query, null); 

    if (cursor.getCount() > 0) { 
    cursor.moveToFirst(); 
    do { 

     List<UserDetailsDTO> comb_Off_Jobs = new 
    ArrayList<UserDetailsDTO>(); 

     do{ 
      UserDetailsDTO comb_off_job = new UserDetailsDTO(); 


         comb_off_job.setUserName(cursor.getString(cursor.getColumnIndexOrThrow(UserDBHandler.USER_NAME))); 
      comb_off_job.setPassword(cursor.getString(cursor.getColumnIndexOrThrow(UserDBHandler.PASSWORD))); 
      comb_off_job.setConfirmPassword(cursor.getString(cursor.getColumnIndexOrThrow(UserDBHandler.CONFIRM_PASSWORD))); 
      comb_off_job.setMobileNumber(cursor.getString(cursor.getColumnIndexOrThrow(UserDBHandler.USER_MOBILE_NUMBER))); 

      comb_Off_Jobs.add(comb_off_job); 

     } 
     while(cursor.moveToNext()); 
} 
     return (ArrayList<UserDetailsDTO>)comb_Off_Jobs; 
    }   
} 
catch(IllegalArgumentException e){ 
    e.printStackTrace(); 
} 
finally{ 
    if(cursor!=null){ 
     cursor.close(); 
    } 
} 
return null; 

}

我希望你能得到预期的结果....

来源

2014-01-08 08:32:22

雅iwrote，但它不工作 – Durga

从SQLite读取数据android

回答

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