Java Annotation-优快云博客

本文介绍了一个使用Java注解进行ORM配置的例子，展示了如何通过@Table和@Column注解定义数据库表及其字段。

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        @Documented 
       
        @Target 
        (ElementType.TYPE) 
       
        @Retention 
        (RetentionPolicy.RUNTIME) 
       
        public 
         @interface 
         Table { 
       
        String name(); 
       
        String primaryKey(); 
       
        } 
       
        @Documented 
       
        @Target 
        (ElementType.FIELD) 
       
        @Retention 
        (RetentionPolicy.RUNTIME) 
       
        public 
         @interface 
         Column { 
       
        String name(); 
       
        boolean 
         notNull(); 
       
        boolean 
         unique(); 
       
        String check(); 
       
        public 
         String defaultValue(); 
       
        String collate(); 
       
        } 
       
        @Table 
        (name =  
        "" 
        , primaryKey =  
        "" 
        ) 
       
        public 
         class 
         Task { 
       
        @Column 
        (check =  
        "" 
        , collate =  
        "" 
        , defaultValue =  
        "" 
        , name =  
        "" 
        , notNull =  
        false 
        , unique =  
        false 
        ) 
       
        private 
         String createTime; 
       
        @Column 
        (check =  
        "" 
        , collate =  
        "" 
        , defaultValue =  
        "" 
        , name =  
        "" 
        , notNull =  
        false 
        , unique =  
        false 
        ) 
       
        private 
         String name; 
       
        }