Question

在尝试插入名为“my_card”的表时，我遇到了一个非常奇怪的错误。

这些是我在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参数给出的表。

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，按下保存按钮后，将创建该类的实例，并且必须将某些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：table my_card没有名为web的列....”

我一遍又一遍地检查错字错误，但没有...所以我现在不知道该怎么办......有什么想法吗？谢谢

Answer 1

您的create SQL以CREATE TABLE IF NOT EXISTS开头。所以我的想法是你在设备已经拥有该表时添加了web列。如果是这种情况，那么只需重新安装应用程序 - 它将删除数据库，因此您可以确保将使用该列创建表。

Answer 2

对于我的情况，我忘记为该类型插入一个空格，就像下面的错误代码一样：

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);

FACEBOOK列将出现由于缺少一个空格而导致的异常。因此，在我的情况下，当发生此sqlite异常时，您还可以检查数据库表格式。

例外“表....没有列名为......”

2 个答案: