在Android的sqlLite3數據庫坎特商店Facebook訪問令牌

Question

我正在做一個涉及Facebook整合的應用程序。 我必須存儲訪問令牌，以便它不需要再次登錄以查看應用程序。但我無法存儲訪問令牌。 以下是錯誤，我得到

08-16 13:57:53.236: ERROR/Database(7964): Error inserting acces_token=177852938929775|8e4aec98e182f7034b497766.3-618306968|YAriJqaRTDz1aIgNHjom_tdBnnw 
08-16 13:57:53.236: ERROR/Database(7964): android.database.sqlite.SQLiteConstraintException: error code 19: constraint failed 
08-16 13:57:53.236: ERROR/Database(7964):  at android.database.sqlite.SQLiteStatement.native_execute(Native Method) 
08-16 13:57:53.236: ERROR/Database(7964):  at android.database.sqlite.SQLiteStatement.execute(SQLiteStatement.java:55) 
08-16 13:57:53.236: ERROR/Database(7964):  at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1623) 
08-16 13:57:53.236: ERROR/Database(7964):  at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1484) 
08-16 13:57:53.236: ERROR/Database(7964):  at org.db.dbHelper.insertRows(dbHelper.java:63) 
08-16 13:57:53.236: ERROR/Database(7964):  at org.neighbourhood.neighbourhood.onFacebookConnectorWorking(neighbourhood.java:142) 

代碼： -

dbHelper db = new dbHelper(neighbourhood.this); 
     db.open(); 
     ContentValues cv = new ContentValues(); 
     cv.put("acces_token", 
        facebookConnector.getFacebook().getAccessToken()); 
     db.insertRows(cv, "facebook"); 
     db.close(); 

守則inset值在數據庫： -

公共類dbHelper {

private final String DATABASE_NAME = "neighbourhood.db"; 
private final String TAG = "dbHelper"; 

private static final String DATABASE_CREATE_TABLE_LOGIN = "create table login" + 
     " (is_login text not null);"; 

private static final String DATABASE_CREATE_TABLE_FACEBOOK = "create table " 
     + "facebook" 
     + " (name text not null," 
     + "first_name text not null," + 
     "last_name text not null," + 
     "gender text not null," + 
     "email text not null," + 
     "id text not null," + 
     "birthday text not null," + 
     "acces_token text not null);"; 


private SQLiteDatabase myDatabase; 
private myDbhelper helper; 

public dbHelper(Context context) { 
    helper = new myDbhelper(context, DATABASE_NAME, null, 1); 
} 

/** 
* This method is used to open the database in Writable mode 
* 
* @return instance of the database 
*/ 
public dbHelper open() { 
    try { 
     myDatabase = helper.getWritableDatabase(); 
    } catch (SQLException ex) { 
     ex.printStackTrace(); 
     } 
    return this; 
} 

/** 
* This method is used for closing the database 
*/ 
public void close() { 
    myDatabase.close(); 
} 


public long insertRows(ContentValues values, String tableName) { 
    long val = myDatabase.insert(tableName, null, values); 
    return val; 
} 

public Cursor getAllValues(String tableName) { 
    Cursor myResult; 
    myResult = myDatabase.query(tableName, null, null, null, null, null, 
      null, null); 

    return myResult; 
} 


private static class myDbhelper extends SQLiteOpenHelper { 
    public myDbhelper(Context context, String name, CursorFactory factory, 
      int version) { 
     super(context, name, factory, version); 
    } 

    /** 
    * this method is called when the database is created first time 
    */ 
    @Override 
    public void onCreate(SQLiteDatabase _db) { 
     _db.execSQL(DATABASE_CREATE_TABLE_LOGIN); 
     _db.execSQL(DATABASE_CREATE_TABLE_FACEBOOK); 

    } 

    /** 
    * this method is called when the database version is changed 
    */ 
    @Override 
    public void onUpgrade(SQLiteDatabase _db, int _oldVersion, 
      int _newVersion) { 
     /* 
     * _db.execSQL("DROP TABLE IF EXISTS all_audio"); 
     * _db.execSQL("DROP TABLE IF EXISTS all_video"); 
     * _db.execSQL("DROP TABLE IF EXISTS all_playlist"); 
     */ 
     _db.execSQL("DROP TABLE IF EXISTS all_playlist_song"); 
     onCreate(_db); 

    } 
} 

}

Answer 1

你的架構指定您facebook表的所有字段應該是NOT NULL，但你只插入acces_token領域，這將迫使剩餘的字段是NULL。

private static final String DATABASE_CREATE_TABLE_FACEBOOK = "create table " 
    + "facebook" 
    + " (name text not null," 
    + "first_name text not null," + 
    "last_name text not null," + 
    "gender text not null," + 
    "email text not null," + 
    "id text not null," + 
    "birthday text not null," + 
    "acces_token text not null);"; 

這就是爲什麼例外說android.database.sqlite.SQLiteConstraintException: error code 19: constraint failed - 你NOT NULL約束受到侵犯。

您需要將acces_token分隔成一個單獨的表格（例如假設的「admin」表格），放寬您對其他字段的約束，或者插入整行數據而不僅僅是acces_token。

Answer 2

insertRows方法應該具有ContentValues參數。 而在那個方法中，你必須調用contentvalues.putall方法來在數據庫中插入值。 試試這個：

public long insertRows(ContentValues values, String tableName) 
    { 
     ContentValues in=new ContentValues(); 
     in.putAll(values); 


     return myDatabase.insert(tableName, null, in); 
    } 

Answer 3

直到我們看到你的表方案，我們不能提供什麼可能導致錯誤的信息。也許你限制acces_token創建表時的長度？

Answer 4

根據我的經驗，沒有必要存儲訪問令牌。有一些很好的理由：

（1）Facebook的API有葛-登錄功能，你想要做什麼

（2）訪問令牌可以改變的，這不會發生每天或每一週，但確實如此，並且當它發生時，您將需要在登錄失敗後更新數據庫。 （3）該API與Android的官方Facebook應用程序一起使用，所以如果用戶在他們的手機上登錄Facebook應用程序，他們將不必在您的應用程序中。 （4）如果用戶沒有在他們的電話上安裝官方Facebook應用程序，則可以使用來自瀏覽器的cookie，並且這是通過Facebook API自動完成的。