异常“表...没有列名...”(Exception “table… has no column named…”)

 我在尝试插入名为“my_card”的表时遇到了一个非常奇怪的错误。 
 
 这些是我在一个单独的界面中定义的一些常量： 
 
//tables name
public static final String TABLE_MY_CARD= "my_card" ;
public static final String TABLE_MY_CONTACTS = "my_contacts" ;

// Columns
public static final String NAME = "name" ;
public static final String PHONE = "phone" ;
public static final String EMAIL = "email";

public static final String FACEBOOK = "facebook";
public static final String WEBSITE = "web";
public static final String MAJOR = "major";
public static final String ULINK = "ulink";
 
 之后，我有一个扩展SQLiteOpenHelper的类，有2个函数。 最重要的是第一个创建由参数给出的表格。 
 
public class MySQLite_methods extends SQLiteOpenHelper implements Tables {

private static final String DATABASE_NAME = "my_database.db" ;
private static final int DATABASE_VERSION = 1;
private String TABLE_NAME;

/** Create a helper object for the Events database */
public MySQLite_methods (Context ctx, String table_name) 
{
    super(ctx, DATABASE_NAME, null, DATABASE_VERSION);
    this.TABLE_NAME = table_name;
}

@Override
public void onCreate(SQLiteDatabase db) 
{       
    String sql = "CREATE TABLE IF NOT EXISTS " + TABLE_NAME + 
                    " (" + _ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +               
                    NAME + " TEXT NOT NULL," + 
                    PHONE + " TEXT NOT NULL,"+
                    EMAIL + " TEXT NOT NULL,"+                      
                    FACEBOOK + " TEXT,"+
                    WEBSITE + " TEXT,"+
                    MAJOR + " TEXT NOT NULL,"+
                    ULINK + " TEXT NOT NULL" + ");" ;

    db.execSQL(sql);
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
{
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
    onCreate(db);
}
}
 
 最后，在我的活动中，按下按钮保存后，将创建一个类的实例，并且必须将一些EditText-s的值插入到数据库中： 
 
            MySQLite_methods mysql = new MySQLite_methods (context, TABLE_MY_CARD);


            Log.d("geo", "before getWr....");

            // getting the database..
            SQLiteDatabase db = mysql.getWritableDatabase();

            // creating an object of type ContentValues which represents the record i am gonna add into the DB
            ContentValues values = new ContentValues();

            values.put(NAME, name.getText().toString());
            values.put(PHONE, phone.getText().toString());
            values.put(EMAIL, email.getText().toString());

            values.put(FACEBOOK, facebook.getText().toString());
            values.put(WEBSITE, website.getText().toString());
            values.put(MAJOR, major.getText().toString());
            values.put(ULINK, ulink.getText().toString());

            Log.d("geo", "before insert");

            // inserting data
            db.insertOrThrow(TABLE_MY_CARD, null, values);
 
 在插入时它给出了这个例外： 
 
 “android.database.sqlite.SQLiteException：表my_card没有列名为web ....” 
 
 我一遍又一遍地检查了输入错误，但没有...所以我现在不知道该怎么办......任何想法？ 谢谢 

I am facing a really weird error,while trying to insert into a table called "my_card".
 
These are some constants I defined in a separate interface:
 
//tables name
public static final String TABLE_MY_CARD= "my_card" ;
public static final String TABLE_MY_CONTACTS = "my_contacts" ;

// Columns
public static final String NAME = "name" ;
public static final String PHONE = "phone" ;
public static final String EMAIL = "email";

public static final String FACEBOOK = "facebook";
public static final String WEBSITE = "web";
public static final String MAJOR = "major";
public static final String ULINK = "ulink";
 
After that I have a class which extends SQLiteOpenHelper, with 2 functions. The most important is the first one which creates the table given by a parameter.
 
public class MySQLite_methods extends SQLiteOpenHelper implements Tables {

private static final String DATABASE_NAME = "my_database.db" ;
private static final int DATABASE_VERSION = 1;
private String TABLE_NAME;

/** Create a helper object for the Events database */
public MySQLite_methods (Context ctx, String table_name) 
{
    super(ctx, DATABASE_NAME, null, DATABASE_VERSION);
    this.TABLE_NAME = table_name;
}

@Override
public void onCreate(SQLiteDatabase db) 
{       
    String sql = "CREATE TABLE IF NOT EXISTS " + TABLE_NAME + 
                    " (" + _ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +               
                    NAME + " TEXT NOT NULL," + 
                    PHONE + " TEXT NOT NULL,"+
                    EMAIL + " TEXT NOT NULL,"+                      
                    FACEBOOK + " TEXT,"+
                    WEBSITE + " TEXT,"+
                    MAJOR + " TEXT NOT NULL,"+
                    ULINK + " TEXT NOT NULL" + ");" ;

    db.execSQL(sql);
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
{
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
    onCreate(db);
}
}
 
And finally, in my activity, after pressing a button for save, an instance of the class will be created and the values of some EditText-s have to be inserted into the database:
 
            MySQLite_methods mysql = new MySQLite_methods (context, TABLE_MY_CARD);


            Log.d("geo", "before getWr....");

            // getting the database..
            SQLiteDatabase db = mysql.getWritableDatabase();

            // creating an object of type ContentValues which represents the record i am gonna add into the DB
            ContentValues values = new ContentValues();

            values.put(NAME, name.getText().toString());
            values.put(PHONE, phone.getText().toString());
            values.put(EMAIL, email.getText().toString());

            values.put(FACEBOOK, facebook.getText().toString());
            values.put(WEBSITE, website.getText().toString());
            values.put(MAJOR, major.getText().toString());
            values.put(ULINK, ulink.getText().toString());

            Log.d("geo", "before insert");

            // inserting data
            db.insertOrThrow(TABLE_MY_CARD, null, values);
 
At the moment of the insert it gives this exception:
 
"android.database.sqlite.SQLiteException: table my_card has no column named web ...."
 
I checked over and over again for typo mistakes, but none... So i dont know what to do now... Any idea? Thank you

原文：https://stackoverflow.com/questions/8197396