SQLiteConstraintException：錯誤代碼19：約束失敗

初學者在這裏再次需要建議。嘗試按照教程向/從數據庫添加/編輯/刪除數據。SQLiteConstraintException：錯誤代碼19：約束失敗

但是嘗試添加一個新的標題時，我收到以下錯誤：

ERROR/Database(278): Error inserting Book_Title=testtitle Book_Author=testauthor 

ERROR/Database(278): android.database.sqlite.SQLiteConstraintException: error code 19: constraint failed

我懷疑它的一個contraint上的ID，由於該數據庫在前面的類文件已經創建。然而，我並不熟悉Java知道如何解決它。編輯和刪除數據正常工作。

一些代碼：

DatabaseManager.class：

public void addRow(String rowStringOne, String rowStringTwo) 
    { 
     // this is a key value pair holder used by android's SQLite functions 
     ContentValues values = new ContentValues(); 


     values.put(TABLE_ROW_ONE, rowStringOne); 
     values.put(TABLE_ROW_TWO, rowStringTwo); 


     // ask the database object to insert the new data 
     try{db.insert(TABLE_NAME, null, values);} 
     catch(Exception e) 
     { 
      Log.e("DB ERROR", e.toString()); 
      e.printStackTrace(); 
     } 
    } 



private class CustomSQLiteOpenHelper extends SQLiteOpenHelper 
    { 



     public CustomSQLiteOpenHelper(Context context) 
     { 
      super(context, DB_NAME, null, DB_VERSION); 
     } 

     @Override 
     public void onCreate(SQLiteDatabase db) 
     { 
      // This string is used to create the database. It should 
      // be changed to suit your needs. 
      String newTableQueryString = "create table " + 
             TABLE_NAME + 
             " (" + 
             TABLE_ROW_ID + " integer primary key autoincrement not null," + 
             TABLE_ROW_ONE + " text," + 
             TABLE_ROW_TWO + " text" + 
             ");"; 




      // execute the query string to the database. 
      db.execSQL(newTableQueryString); 

     } 


     @Override 
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
     { 
      // NOTHING TO DO HERE. THIS IS THE ORIGINAL DATABASE VERSION. 
      // OTHERWISE, YOU WOULD SPECIFIY HOW TO UPGRADE THE DATABASE. 
     } 
    } 
}

AddData.class：

private void addRow() 
{ 
    try 
    { 
     // ask the database manager to add a row given the two strings 
     db.addRow 
     (

       textFieldOne.getText().toString(), 
       textFieldTwo.getText().toString() 

     ); 

     // request the table be updated 
     updateTable(); 

     // remove all user input from the Activity 
     emptyFormFields(); 
    } 
    catch (Exception e) 
    { 
     Log.e("Add Error", e.toString()); 
     e.printStackTrace(); 
    } 
}

來源

2011-05-20 d347hkn3ll