JPA注解添加唯一约束

使用JPA注解添加唯一约束

若实体类属性没有指定columnName属性，则coluNames为实体类的属性名称

• 单字段添加唯一约束（未在实体类属性上指定列名称，指定实体约束列为属性名称）

  @Table(name = "charge",
            uniqueConstraints = {@UniqueConstraint(columnNames="applyId")})	

     @Column(name = "apply_id",columnDefinition = "Integer(8) COMMENT '申请关联ID'")
        private Integer applyId;	

• 多字段添加唯一约束(指定列名称)

@Table(name = "project_apply",
    uniqueConstraints =
            {@UniqueConstraint(columnNames = {"project_id", "customer_id",
                    "demand_id"})}

    /**
         *客户信息ID
         */
        @Column(name = "customer_id")
        private Integer customerId;