1.解析json
适用于:SQL Server 2016 (13.x) 及更高版本Azure SQL 数据库Azure SQL 托管实例Azure Synapse AnalyticsMicrosoft Fabric 中的 SQL 终结点Microsoft Fabric 中的仓库
(1)使用OPENJSON()函数
declare @json as varchar(8000)
set @json='[
{"id":1178,"myObject.Plies":3,"myObject.Createtime":"2020-07-21T14:33:18.480"},
{"id":1179,"myObject.Plies":3,"myObject.Createtime":"2020-07-21T14:36:27.457"}]'
select * from openjson(@json);
(2)通过WITH选型,自定义输出列
declare @json2 as varchar(8000)
set @json2='{"myRoot":[
{"id":1178,"myObject":{"Plies":3,"Createtime":"2020-07-21T14:33:18.480"}},
{"id":1179,"myObject":{"Plies":3,"Createtime":"2020-07-21T14:36:27.457"}}
]}'
select * from openjson(@json2,'$.myRoot')
with(
id varchar(10) ,
Plies int '$.myObject.Plies',
Createtime datetime '$.myObject.Createtime'
);
2.Json函数
(1) ISJSON:测试字符串是否包含有效 JSON。
print iif(isjson(@param) > 0, 'OK', 'NO');
2、JSON_VALUE :从 JSON 字符串中提取标量值。
print json_value(@param, '$.info.address.town');
print json_value(@param, '$.info.tags[1]');
3、JSON_QUERY :从 JSON 字符串中提取对象或数组。返回类型为 nvarchar(max) 的 JSON 片段
print json_query(@param, '$.info');
{
"type":1,
"address":{
"town":"Bristol",
"county":"Avon",
"country":"England"
},
"tags":["Sport", "Water polo"]
}
4、JSON_MODIFY :更新 JSON 字符串中属性的值,并返回已更新的 JSON 字符串。
print json_modify(@param, '$.info.address.town', 'London');
返回:
{
"info":{
"type":1,
"address":{
"town":"London",
"county":"Avon",
"country":"England"
},
"tags":["Sport", "Water polo"]
},
"type":"Basic"
}
实例演示代码
declare @param nvarchar(max);
set @param=N'{
"info":{
"type":1,
"address":{
"town":"Bristol",
"county":"Avon",
"country":"England"
},
"tags":["Sport", "Water polo"]
},
"type":"Basic"
}';
print iif(isjson(@param)>0, 'OK', 'NO');
print json_query(@param);
print json_value(@param, '$.info.address.town');
print json_value(@param, '$.info.tags[1]');
print json_query(@param, '$.info');
print json_query('["2020-1-8","2020-1-9"]');
print json_modify(@param, '$.info.address.town', 'London');
官方文档:https://learn.microsoft.com/zh-cn/sql/t-sql/functions/openjson-transact-sql?view=sql-server-ver16