lombok 和 hibernate 配合对实体类注解

小灰灰 2022-05-11 04:52 228阅读 0赞

lombok的@Data注解,可以在编译过程中自动插入get/set ,有参构造,hash,toString 等方法

但是这个类如果是表中的映射类,使用的hibernate的注解映射,怎么办,请看hibernate映射注解的实例,

## 问题: ##

可以看到hibernate注解实体类时,会在每个get方法上加 @Column注解,主键上还会加@GenericGenerator,@GeneratedValue,@Id注解,按照lombok 去掉get/set的逻辑这就很难办啊

package com.money.test.entry;
    
    import java.util.HashSet;
    import java.util.Set;
    import javax.persistence.CascadeType;
    import javax.persistence.Column;
    import javax.persistence.Entity;
    import javax.persistence.FetchType;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    import javax.persistence.OneToMany;
    import javax.persistence.Table;
    import org.hibernate.annotations.GenericGenerator;
    
    /**
     * MoneyType entity. @author MyEclipse Persistence Tools
     */
    @Entity
    @Table(name = "money_type", catalog = "httpclientcrawler")
    
    public class MoneyType implements java.io.Serializable {
    
    	// Fields
    
    	private String TId;
    	private String typeName;
    	private Set<MoneyTypeLittle> moneyTypeLittles = new HashSet<MoneyTypeLittle>(0);//外键
    
    	// Constructors
    
    	/** default constructor */
    	public MoneyType() {
    	}
    
    	/** full constructor */
    	public MoneyType(String typeName, Set<MoneyTypeLittle> moneyTypeLittles) {
    		this.typeName = typeName;
    		this.moneyTypeLittles = moneyTypeLittles;
    	}
    
    	// Property accessors
    	@GenericGenerator(name = "generator", strategy = "uuid.hex")
    	@Id
    	@GeneratedValue(generator = "generator")
    
    	@Column(name = "t_id", unique = true, nullable = false, length = 64)
    
    	public String getTId() {
    		return this.TId;
    	}
    
    	public void setTId(String TId) {
    		this.TId = TId;
    	}
    
    	@Column(name = "type_name", length = 64)
    
    	public String getTypeName() {
    		return this.typeName;
    	}
    
    	public void setTypeName(String typeName) {
    		this.typeName = typeName;
    	}
    
    	@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "moneyType")
    
    	public Set<MoneyTypeLittle> getMoneyTypeLittles() {
    		return this.moneyTypeLittles;
    	}
    
    	public void setMoneyTypeLittles(Set<MoneyTypeLittle> moneyTypeLittles) {
    		this.moneyTypeLittles = moneyTypeLittles;
    	}
    
    }

## lombok 的@Getter ##

后来在网上搜索相关的内容,没什么发现,但是看到一个介绍lombok注解的文章,提到了@Getter注解有一个属性,可以放入其他注解,

但是jdk7 和 jak 8 的写法不同

/**
    	 * Any annotations listed here are put on the generated method.
    	 * The syntax for this feature depends on JDK version (nothing we can do about that; it's to work around javac bugs).<br>
    	 * up to JDK7:<br>
    	 *  {@code @Getter(onMethod=@__({@AnnotationsGoHere}))}<br>
    	 * from JDK8:<br>
    	 *  {@code @Getter(onMethod_={@AnnotationsGohere})} // note the underscore after {@code onMethod}.
    	 *  
    	 * @return List of annotations to apply to the generated getter method.
    	 */
    	AnyAnnotation[] onMethod() default {};

## lombok 配合 hibernate 注解实体类实例 ##

如图所示,就是在每个属性上面标注@Getter注解 的onMethod上面将@Column等注解加入进来,感觉这样配起来也很麻烦,也许lombok 适合那种数据实体类,不适合这种和表关联的实体类

package com.money.test.entry;
    
    import java.math.BigDecimal;
    import java.util.Date;
    
    import javax.persistence.Column;
    import javax.persistence.Entity;
    import javax.persistence.Table;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    
    import org.hibernate.annotations.GenericGenerator;
    
    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.Getter;
    import lombok.NoArgsConstructor;
    
    /**
     * MoneyUse entity. @author MyEclipse Persistence Tools
     */
    @Entity
    @Table(name = "money_use", catalog = "httpclientcrawler")
    @Data
    @NoArgsConstructor
    @AllArgsConstructor
    public class MoneyUse implements java.io.Serializable {
    
    	// Fields
    
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = 1L;
    	
    	@Getter(onMethod_={@GenericGenerator(name = "generator", strategy = "uuid.hex"),@Id,@GeneratedValue(generator = "generator"),
    			@Column(name = "m_id", unique = true, nullable = false, length = 64)})
    	private String mId;
    	
    	@Getter(onMethod_={@Column(name = "tl_id", length = 64)})
    	private String tlId;
    	
    	@Getter(onMethod_={@Column(name = "order_amount", precision = 25, scale = 8)})
    	private BigDecimal orderAmount;
    	
    	@Getter(onMethod_={@Column(name = "order_time")})
    	private Date orderTime;
    	
    	@Getter(onMethod_={@Column(name = "is_out")})
    	private Boolean isOut;//mysql 数据库 tinyint 字段表示Boolean ; 0 代表false ,1 代表true
    	
    	@Getter(onMethod_={@Column(name = "is_must")})
    	private Boolean isMust;
    	
    	@Getter(onMethod_={@Column(name = "standard_amount", precision = 25, scale = 8)})
    	private BigDecimal standardAmount;//标准花费
    }