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Java code:

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private Integer bonus = 0;
public Integer getBonus() {
return bonus;
}
public void setBonus(Integer bonus) {
this.bonus = bonus;
}


String SQL = "UPDATE users SET bonus = bonus" + this.getBonus()
+ " WHERE id='" + this.getID() + "'";
new DataBase().executeUpdate(SQL);



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SQL code:

SET bonus=bonus3 WHERE id='2' ¸½½üÓÐÎó



ÕæÔΣ¡£¬Ô­À´ÊÇbonusºÍthis.getBonus()ûÓнøÐмӷ¨ÔËË㣬¶øÊÇ×Ö·ûÁ¬½ÓÔËËãÁË£¡

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String SQL = "UPDATE users SET bonus = concat(this.getBonus(),bonus)" +
                + " WHERE id='" + this.getID() + "'";
        new DataBase().executeUpdate(SQL);




Èç¹ûÉÏÃæµÄ²»ÐÐÄãÔÙÊÔÊÔÏÂÃæµÄ
String SQL = "UPDATE users SET bonus = bonus||¡±+this.getBonus
              &


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