1. Method to convert json string into Java object and Java object array

1. public static void main(String[] args) {  
     
       User_DAL userDal = new User_DAL();// 创建数据访问对象  
       ResponseResult<User> ret = userDal.getUserList("id < 50", 2, 10);// 查询ID小于50的用户，保存到分页类中  
       String json = JSON.toJSONString(ret, true); // 将对象转换成json字符串，true为格式化输出  
       System.out.println(json);  
         
       List<User> list = JSON.parseArray("{{name:123},{name:456}}", User.class);//将json字符串，转换成Java对象数组  
       for (int i = 0; i < list.size(); i++) {  
           System.out.println(list.get(i).getName());  
       }  
   }

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#2.jQueryAdd attributeDelete attribute

jQuery(
  $("#id").attr("
readonly
":"readonly");
 //添加readonly属性 & $("#ID").attr({ readonly: 'true' });
  $("#id").removeAttr("readonly"); //去除readonly属性
);

3. When the form is submitted, there are objects and parameters.

Encapsulate the required objects first

#ajax passes data

Java background processing: fastJson converts json string into Java object

#No more errors will be reported when reloading the page.

##Place the following code in your CSS file That’s it:

.break-word { word-wrap: break-word; break-word: break-all; }

7. How to use the INSERT INTO SELECT FROM statement with specific examples

If the fields of the two tables are the same, you can use it directly.

insert into table_a select * from table_b
如果两表字段不同，a表需要b中的某几个字段即可，则可以如下使用：
insert into table_a(field_a1,field_a2,field_a3) select field_b1,field_b2,field_b3) from table_b
以上语句前提条件是每个字段对应的字段类型相同或可以自动转换。

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