Hibernate 註解@Column(nullable = false) 和 @Column(unique=true)
unique=true是指這個欄位的值在這張表裡不能重複，所有記錄值都要唯一，就像主鍵那樣;
nullable=false是這個欄位在儲存時必需有值，不能還是null值就呼叫save去儲存入庫;
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