SqlServer解析XML，解析JSON数据格式

一：解析XML(SQL2005版本开始支持)

declare @pro_xml varchar(max)=
	  '<reg>
	   <node>
	      <pro_id>3</pro_id>
		  <pro_sale_num>10</pro_sale_num>
		  <server_amount>10.00</server_amount>
		  <express_amount>0.00</express_amount>
	   </node>
	   <node>
	      <pro_id>4</pro_id>
		  <pro_sale_num>20</pro_sale_num>
		  <server_amount>20.00</server_amount>
		  <express_amount>30.00</express_amount>
	   </node>
	   <node>
	      <pro_id>7</pro_id>
		  <pro_sale_num>30</pro_sale_num>
		  <server_amount>30.00</server_amount>
		  <express_amount>40.00</express_amount>
	   </node>
	   </reg>' 
declare @xml xml=@pro_xml
select * from (
select t.c.value('(pro_id/text())[1]','int') as pro_id,
	   t.c.value('(pro_sale_num/text())[1]','int') as pro_sale_num,
	   t.c.value('(server_amount/text())[1]','decimal(18,2)') as server_amount,
	   t.c.value('(express_amount/text())[1]','decimal(18,2)') as express_amount
from @xml.nodes('/reg/node') as t(c)
) as T

二.解析JSON（SQL2016版本开始支持）

SqlServer对json的功能主要包含 IsJson, Json_Value, Json_Modify, Json_Query

1: IsJson 解析该字符串是否是合法的json格式

格式：IsJson(@express)

declare @pro_json varchar(max)
set @pro_json='[
  {"pro_id":3,"pro_sale_num":10,"server_amount":"10.00","express_amount":"5"},
  {"pro_id":4,"pro_sale_num":15,"server_amount":"15.00","express_amount":"10"},
  {"pro_id":7,"pro_sale_num":20,"server_amount":"20.00","express_amount":"15"}
]'
select IsJson(@pro_json)

合法返回1，不合法返回0, 如果表达式为 NULL，则返回NULL

2: Json_Value 从Json字符串中提出标量值

格式：Json_Value (value,'$.column') from openjson(@express)

注：include_null_values 表示表达式中为NULL,输出NULL

declare @pro_json varchar(max)
set @pro_json='[
  {"pro_id":3,"pro_sale_num":10,"server_amount":"10.00","express_amount":"5"},
  {"pro_id":4,"pro_sale_num":15,"server_amount":"15.00","express_amount":"10"},
  {"pro_id":7,"pro_sale_num":20,"server_amount":"20.00","express_amount":"15"}
]'
select  
JSON_VALUE(value,'$.pro_id') as pro_id,
JSON_VALUE(value,'$.pro_sale_num') as pro_sale_num,
JSON_VALUE(value,'$.server_amount') as server_amount,
JSON_VALUE(value,'$.express_amount') as express_amount
from openjson(@pro_json) include_null_values

3: Json_Query从Json字符串中提取对象或数组

格式：Json_Query(value,'$.object') from openjson(@express)

declare @pro_json varchar(max)
set @pro_json='[
  {"pro_id":3,"pro_sale_num":[{"sale_id":13,"sale_num":103}],"server_amount":"10.00","express_amount":"5"},
  {"pro_id":4,"pro_sale_num":[{"sale_id":14,"sale_num":104}],"server_amount":"15.00","express_amount":"10"}
]'
select JSON_VALUE(value,'$.pro_id'),JSON_QUERY(VALUE,'$.pro_sale_num') from openjson(@pro_json)

4: json_Modify 更新Json字符串中的属性值，并返回更新的Json字符串

格式：json_Modify(value,'$.column',newValue) from openjson(@express)

declare @pro_json varchar(max)
set @pro_json=
'[
  {"pro_id":3,"pro_sale_num":[{"sale_id":13,"sale_num":103}],"server_amount":"10.00","express_amount":"5"},
  {"pro_id":4,"pro_sale_num":[{"sale_id":14,"sale_num":104}],"server_amount":"15.00","express_amount":"10"}
]'    
select JSON_MODIFY(value,'$.pro_id','2') from openjson(@pro_json)

5:多层负责的Json解析

declare @pro_json varchar(max)
set @pro_json=
'[
  {"pro_id":3,"pro_sale_num":[{"sale_id":13,"sale_num":103}],"server_amount":"10.00","express_amount":"5"},
  {"pro_id":4,"pro_sale_num":[{"sale_id":14,"sale_num":104}],"server_amount":"15.00","express_amount":"10"}
]'    
select JSON_VALUE(value,'$.pro_id')as pro_id,
JSON_VALUE(value,'$.server_amount') as server_amount,
JSON_VALUE(value,'$.express_amount') as express_amount,
t.sale_id,t.sale_num
from openJson(@pro_json) as a
cross apply 
(select JSON_VALUE(value,'$.sale_id')as sale_id,JSON_VALUE(value,'$.sale_num')as sale_num from openJson(Json_Query(value,'$.pro_sale_num')) as b)
as t

SqlServer解析XML，解析JSON数据格式

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