Question

这些是我表中的ID：

KEY_ID(autoincremented integer primary key)   KEY_NAME(text)     KEY_PH_NO(text)

1                                             james                   1234567890
2                                             kristein                6484996755
3                                             Roen                    4668798989
4                                             Ashlie                  6897980909

我想知道的是，如何在unique(KEY_ID)的基础上从此表中获取单个记录，因为我已经构建了这样的getContact()方法，

Contact getContact(int id) {
    SQLiteDatabase db = this.getReadableDatabase();

    Cursor cursor = db.query(TABLE_CONTACTS, new String[] { KEY_ID,
            KEY_NAME, KEY_PH_NO }, KEY_ID + "=?",
            new String[] { String.valueOf(id) }, null, null, null, null);
    if (cursor != null)
        cursor.moveToFirst();

    Contact contact = new Contact(Integer.parseInt(cursor.getString(0)),
            cursor.getString(1), cursor.getString(2));
    // return contact
    return contact;
}

Contact是一个我为所有属性设置了所有getter和setter方法的类。

请提供完整的代码帮助。

Answer 1

看看这是否可以帮助你..

假设您的表名是Employee

public String getEmployeeName(String empNo) {
    Cursor cursor = null;
    String empName = "";
    try {
        cursor = SQLiteDatabaseInstance_.rawQuery("SELECT EmployeeName FROM Employee WHERE EmpNo=?", new String[] {empNo + ""});
        if(cursor.getCount() > 0) {
            cursor.moveToFirst();
            empName = cursor.getString(cursor.getColumnIndex("EmployeeName"));
        }
        return empName;
    }finally {
        cursor.close();
    }
}

Answer 2

Contact getContact(int id) {
    SQLiteDatabase db = this.getReadableDatabase();

    Cursor cursor = db.query(TABLE_CONTACTS, new String[] { KEY_ID,
        KEY_NAME, KEY_PH_NO }, KEY_ID + "=?",
        new String[] { String.valueOf(id) }, null, null, null, null);
    if (cursor != null)
        cursor.moveToFirst();

    Contact contact = new Contact(Integer.parseInt(cursor.getString(0)),
                        cursor.getString(1), cursor.getString(2));
    // return contact
    return contact;
}

假设您有联系的实体类，那么您只需将其称为上面的方法。

Contact singleContact = database.getContact(id);

然后调用联系人实体，我假设你有方法getter getPhone（）;

Log.d("Phone Number :" , singleContact.getPhone());

Answer 3

试试这个

cursor.moveToPosition(position); cursor.getString(listaTarefas1.getColumnIndex("Item"))

从表中获取一行

3 个答案: