「主鍵應該是唯一的SQLite」錯誤

Question

這是我的主要工作Activity。我在創建SQLite數據庫時出錯。

private final String DB_NAME = "pocketCloudlets"; 
private final String TABLE_NAME_1 = "Members"; 
long count = 0; 
static final String userTable="user"; 

static final String userName = "User"; 
static final String userID = "_id"; 
static final String age ="age"; 
static final String gender = "gender"; 
static final String password = "password"; 
static final String email = "email"; 

// Creating Table for User Record 

protected static final String table1=(" CREATE TABLE IF NOT EXISTS " 
    + userTable + " (" 
    + userID + " INTEGER PRIMARY KEY NOT NULL, " 
    + userName + " VARCHAR ," 
    + age + " VARCHAR ," 
    + gender + " VARCHAR)"); 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     // setContentView(R.layout.main); 

     ArrayList<String> results = new ArrayList<String>(); 
     SQLiteDatabase sampleDB = null; 

     try {  
      sampleDB = this.openOrCreateDatabase(DB_NAME, MODE_PRIVATE, null); 
      sampleDB.execSQL(table1); 

      sampleDB.execSQL("INSERT INTO " + 
       userTable + 
       " Values ('13','dawdaa','4','female');"); 

      Cursor c = sampleDB.rawQuery("SELECT _id,userName, age, gender FROM " + 
       userTable + " ", null); 
     } catch (Throwable t) { 
      // completed by the editor of this question 
      // the 'catch' part of the try-catch structure was NOT present 
     } 

Answer 1

Cursor c = sampleDB.rawQuery("SELECT _id,userName, age, gender FROM " + 
    userTable + " ", null); 

您在表中沒有userName列，而是你與user列創建表。

使用，而不是：

Cursor c = sampleDB.rawQuery("SELECT _id, user, age, gender FROM " + userTable, null); 

Answer 2

嘗試將用戶ID列整數主鍵自動遞增。我也很確定你不能在sqlite中使用VARCHAR - 你需要使用TEXT來代替。看看這個鏈接作爲參考：http://www.sqlite.org/datatype3.html

Answer 3

我想這個工作第一次你開始的活動。現在，您已經插入了一行_id = 13，現在，每當您再次執行此操作時，您都會一遍又一遍地創建相同的ID。

正如您指定_id爲表的主鍵，這是不允許的 - 主鍵必須是唯一的。