表和Json的相互操作
目录
一、表转Json
1.使用 for json path
2.如何返回单个Json
3.如何给返回的Json增加一个根节点呢
4.如何给返回的Json增加上一个节点
二、对Json基本操作
1.判断给的字符串是否是Json格式
2.从 JSON 字符串中提取标量值
3. 从 JSON 字符串中提取对象或数组
4. 更新 JSON 字符串中属性的值，并返回已更新的 JSON 字符串
三、Json转成表
1.使用OPENJSON WITH
2.多层嵌套的Json如何转成表呢
总结
一、表转Json
1.使用 for json path
代码如下（示例）：
set ROWCOUNT 2
select * from AdministrativeDivision for json path
运行结果
[
{
"ID":100000,
"Name":"中国",
"ParentId":0,
"ShortName":"中国",
"LevelType":0,
"CityCode":"",
"ZipCode":"",
"MergerName":"中国",
"lng":116.3683244,
"Lat":39.915085,
"Pinyin":"China"
},
{
"ID":110000,
"Name":"北京",
"ParentId":100000,
"ShortName":"北京",
"LevelType":1,
"CityCode":"",
"ZipCode":"",
"MergerName":"中国,北京",
"lng":116.405285,
"Lat":39.904989,
"Pinyin":"Beijing"
}
]表字段为key,对应的值为Value，
等效与 for json auto
set ROWCOUNT 2
select * from AdministrativeDivision for json auto2.如何返回单个Json
代码如下（示例）：
set ROWCOUNT 1;
select * from AdministrativeDivision for json auto运行结果
[
{
"ID":100000,
"Name":"中国",
"ParentId":0,
"ShortName":"中国",
"LevelType":0,
"CityCode":"",
"ZipCode":"",
"MergerName":"中国",
"lng":116.3683244,
"Lat":39.915085,
"Pinyin":"China"
}
]返回了一个Json对象，是以数组的形式返回的，没有达到我们想要的效果
使用这个 WITHOUT_ARRAY_WRAPPER 去掉最外层[ ]中括号的包裹
代码如下（示例）：
set ROWCOUNT 1;
select * from AdministrativeDivision for json auto, WITHOUT_ARRAY_WRAPPER运行结果
{
"ID":100000,
"Name":"中国",
"ParentId":0,
"ShortName":"中国",
"LevelType":0,
"CityCode":"",
"ZipCode":"",
"MergerName":"中国",
"lng":116.3683244,
"Lat":39.915085,
"Pinyin":"China"
}3.如何给返回的Json增加一个根节点呢
代码如下（示例）：
set ROWCOUNT 1
select * from AdministrativeDivision for json path ,root('业务信息')
运行结果
{
"业务信息":[
{
"ID":100000,
"Name":"中国",
"ParentId":0,
"ShortName":"中国",
"LevelType":0,
"CityCode":"",
"ZipCode":"",
"MergerName":"中国",
"lng":116.3683244,
"Lat":39.915085,
"Pinyin":"China"
}
]
}注意 root('') 和 WITHOUT_ARRAY_WRAPPER 不能同时使用
4.如何给返回的Json增加上一个节点
代码如下（示例）：
set ROWCOUNT 0;
select a.ID, a.Name , b.ID as 'child.Id' ,b.Name as 'child.Name' from AdministrativeDivision a
inner join AdministrativeDivision b on a.ID=b.ParentId
where a.Name like '%湖北省%'
for json path运行结果
[
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420100,
"Name":"武汉市"
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420200,
"Name":"黄石市"
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420300,
"Name":"十堰市"
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420500,
"Name":"宜昌市"
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420600,
"Name":"襄阳市"
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420700,
"Name":"鄂州市"
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420800,
"Name":"荆门市"
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420900,
"Name":"孝感市"
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421000,
"Name":"荆州市"
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421100,
"Name":"黄冈市"
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421200,
"Name":"咸宁市"
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421300,
"Name":"随州市"
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":422800,
"Name":"恩施土家族苗族自治州"
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":429000,
"Name":"直辖县级"
}
}
]增加多个子节点 如下
set ROWCOUNT 0;
select a.ID, a.Name , b.ID as 'child.Id' ,b.Name as 'child.Name',c.ID as 'child.child.Id' ,c.Name as 'child.child.Name'
from AdministrativeDivision a
inner join AdministrativeDivision b on a.ID=b.ParentId
inner join AdministrativeDivision c on c.ParentId=b.ID
where a.Name like '%湖北省%'
for json path
运行结果如下
[
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420100,
"Name":"武汉市",
"child":{
"Id":420102,
"Name":"江岸区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420100,
"Name":"武汉市",
"child":{
"Id":420103,
"Name":"江汉区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420100,
"Name":"武汉市",
"child":{
"Id":420104,
"Name":"硚口区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420100,
"Name":"武汉市",
"child":{
"Id":420105,
"Name":"汉阳区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420100,
"Name":"武汉市",
"child":{
"Id":420106,
"Name":"武昌区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420100,
"Name":"武汉市",
"child":{
"Id":420107,
"Name":"青山区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420100,
"Name":"武汉市",
"child":{
"Id":420111,
"Name":"洪山区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420100,
"Name":"武汉市",
"child":{
"Id":420112,
"Name":"东西湖区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420100,
"Name":"武汉市",
"child":{
"Id":420113,
"Name":"汉南区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420100,
"Name":"武汉市",
"child":{
"Id":420114,
"Name":"蔡甸区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420100,
"Name":"武汉市",
"child":{
"Id":420115,
"Name":"江夏区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420100,
"Name":"武汉市",
"child":{
"Id":420116,
"Name":"黄陂区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420100,
"Name":"武汉市",
"child":{
"Id":420117,
"Name":"新洲区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420200,
"Name":"黄石市",
"child":{
"Id":420202,
"Name":"黄石港区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420200,
"Name":"黄石市",
"child":{
"Id":420203,
"Name":"西塞山区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420200,
"Name":"黄石市",
"child":{
"Id":420204,
"Name":"下陆区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420200,
"Name":"黄石市",
"child":{
"Id":420205,
"Name":"铁山区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420200,
"Name":"黄石市",
"child":{
"Id":420222,
"Name":"阳新县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420200,
"Name":"黄石市",
"child":{
"Id":420281,
"Name":"大冶市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420300,
"Name":"十堰市",
"child":{
"Id":420302,
"Name":"茅箭区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420300,
"Name":"十堰市",
"child":{
"Id":420303,
"Name":"张湾区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420300,
"Name":"十堰市",
"child":{
"Id":420304,
"Name":"郧阳区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420300,
"Name":"十堰市",
"child":{
"Id":420322,
"Name":"郧西县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420300,
"Name":"十堰市",
"child":{
"Id":420323,
"Name":"竹山县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420300,
"Name":"十堰市",
"child":{
"Id":420324,
"Name":"竹溪县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420300,
"Name":"十堰市",
"child":{
"Id":420325,
"Name":"房县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420300,
"Name":"十堰市",
"child":{
"Id":420381,
"Name":"丹江口市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420500,
"Name":"宜昌市",
"child":{
"Id":420502,
"Name":"西陵区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420500,
"Name":"宜昌市",
"child":{
"Id":420503,
"Name":"伍家岗区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420500,
"Name":"宜昌市",
"child":{
"Id":420504,
"Name":"点军区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420500,
"Name":"宜昌市",
"child":{
"Id":420505,
"Name":"猇亭区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420500,
"Name":"宜昌市",
"child":{
"Id":420506,
"Name":"夷陵区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420500,
"Name":"宜昌市",
"child":{
"Id":420525,
"Name":"远安县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420500,
"Name":"宜昌市",
"child":{
"Id":420526,
"Name":"兴山县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420500,
"Name":"宜昌市",
"child":{
"Id":420527,
"Name":"秭归县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420500,
"Name":"宜昌市",
"child":{
"Id":420528,
"Name":"长阳土家族自治县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420500,
"Name":"宜昌市",
"child":{
"Id":420529,
"Name":"五峰土家族自治县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420500,
"Name":"宜昌市",
"child":{
"Id":420581,
"Name":"宜都市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420500,
"Name":"宜昌市",
"child":{
"Id":420582,
"Name":"当阳市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420500,
"Name":"宜昌市",
"child":{
"Id":420583,
"Name":"枝江市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420600,
"Name":"襄阳市",
"child":{
"Id":420602,
"Name":"襄城区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420600,
"Name":"襄阳市",
"child":{
"Id":420606,
"Name":"樊城区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420600,
"Name":"襄阳市",
"child":{
"Id":420607,
"Name":"襄州区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420600,
"Name":"襄阳市",
"child":{
"Id":420624,
"Name":"南漳县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420600,
"Name":"襄阳市",
"child":{
"Id":420625,
"Name":"谷城县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420600,
"Name":"襄阳市",
"child":{
"Id":420626,
"Name":"保康县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420600,
"Name":"襄阳市",
"child":{
"Id":420682,
"Name":"老河口市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420600,
"Name":"襄阳市",
"child":{
"Id":420683,
"Name":"枣阳市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420600,
"Name":"襄阳市",
"child":{
"Id":420684,
"Name":"宜城市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420700,
"Name":"鄂州市",
"child":{
"Id":420702,
"Name":"梁子湖区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420700,
"Name":"鄂州市",
"child":{
"Id":420703,
"Name":"华容区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420700,
"Name":"鄂州市",
"child":{
"Id":420704,
"Name":"鄂城区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420800,
"Name":"荆门市",
"child":{
"Id":420802,
"Name":"东宝区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420800,
"Name":"荆门市",
"child":{
"Id":420804,
"Name":"掇刀区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420800,
"Name":"荆门市",
"child":{
"Id":420821,
"Name":"京山县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420800,
"Name":"荆门市",
"child":{
"Id":420822,
"Name":"沙洋县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420800,
"Name":"荆门市",
"child":{
"Id":420881,
"Name":"钟祥市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420900,
"Name":"孝感市",
"child":{
"Id":420902,
"Name":"孝南区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420900,
"Name":"孝感市",
"child":{
"Id":420921,
"Name":"孝昌县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420900,
"Name":"孝感市",
"child":{
"Id":420922,
"Name":"大悟县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420900,
"Name":"孝感市",
"child":{
"Id":420923,
"Name":"云梦县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420900,
"Name":"孝感市",
"child":{
"Id":420981,
"Name":"应城市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420900,
"Name":"孝感市",
"child":{
"Id":420982,
"Name":"安陆市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":420900,
"Name":"孝感市",
"child":{
"Id":420984,
"Name":"汉川市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421000,
"Name":"荆州市",
"child":{
"Id":421002,
"Name":"沙市区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421000,
"Name":"荆州市",
"child":{
"Id":421003,
"Name":"荆州区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421000,
"Name":"荆州市",
"child":{
"Id":421022,
"Name":"公安县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421000,
"Name":"荆州市",
"child":{
"Id":421023,
"Name":"监利县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421000,
"Name":"荆州市",
"child":{
"Id":421024,
"Name":"江陵县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421000,
"Name":"荆州市",
"child":{
"Id":421081,
"Name":"石首市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421000,
"Name":"荆州市",
"child":{
"Id":421083,
"Name":"洪湖市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421000,
"Name":"荆州市",
"child":{
"Id":421087,
"Name":"松滋市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421100,
"Name":"黄冈市",
"child":{
"Id":421102,
"Name":"黄州区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421100,
"Name":"黄冈市",
"child":{
"Id":421121,
"Name":"团风县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421100,
"Name":"黄冈市",
"child":{
"Id":421122,
"Name":"红安县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421100,
"Name":"黄冈市",
"child":{
"Id":421123,
"Name":"罗田县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421100,
"Name":"黄冈市",
"child":{
"Id":421124,
"Name":"英山县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421100,
"Name":"黄冈市",
"child":{
"Id":421125,
"Name":"浠水县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421100,
"Name":"黄冈市",
"child":{
"Id":421126,
"Name":"蕲春县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421100,
"Name":"黄冈市",
"child":{
"Id":421127,
"Name":"黄梅县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421100,
"Name":"黄冈市",
"child":{
"Id":421181,
"Name":"麻城市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421100,
"Name":"黄冈市",
"child":{
"Id":421182,
"Name":"武穴市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421200,
"Name":"咸宁市",
"child":{
"Id":421202,
"Name":"咸安区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421200,
"Name":"咸宁市",
"child":{
"Id":421221,
"Name":"嘉鱼县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421200,
"Name":"咸宁市",
"child":{
"Id":421222,
"Name":"通城县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421200,
"Name":"咸宁市",
"child":{
"Id":421223,
"Name":"崇阳县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421200,
"Name":"咸宁市",
"child":{
"Id":421224,
"Name":"通山县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421200,
"Name":"咸宁市",
"child":{
"Id":421281,
"Name":"赤壁市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421300,
"Name":"随州市",
"child":{
"Id":421303,
"Name":"曾都区"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421300,
"Name":"随州市",
"child":{
"Id":421321,
"Name":"随县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":421300,
"Name":"随州市",
"child":{
"Id":421381,
"Name":"广水市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":422800,
"Name":"恩施土家族苗族自治州",
"child":{
"Id":422801,
"Name":"恩施市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":422800,
"Name":"恩施土家族苗族自治州",
"child":{
"Id":422802,
"Name":"利川市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":422800,
"Name":"恩施土家族苗族自治州",
"child":{
"Id":422822,
"Name":"建始县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":422800,
"Name":"恩施土家族苗族自治州",
"child":{
"Id":422823,
"Name":"巴东县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":422800,
"Name":"恩施土家族苗族自治州",
"child":{
"Id":422825,
"Name":"宣恩县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":422800,
"Name":"恩施土家族苗族自治州",
"child":{
"Id":422826,
"Name":"咸丰县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":422800,
"Name":"恩施土家族苗族自治州",
"child":{
"Id":422827,
"Name":"来凤县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":422800,
"Name":"恩施土家族苗族自治州",
"child":{
"Id":422828,
"Name":"鹤峰县"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":429000,
"Name":"直辖县级",
"child":{
"Id":429004,
"Name":"仙桃市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":429000,
"Name":"直辖县级",
"child":{
"Id":429005,
"Name":"潜江市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":429000,
"Name":"直辖县级",
"child":{
"Id":429006,
"Name":"天门市"
}
}
},
{
"ID":420000,
"Name":"湖北省",
"child":{
"Id":429000,
"Name":"直辖县级",
"child":{
"Id":429021,
"Name":"神农架林区"
}
}
}
]从结果来看 并没有达到我们想要的效果 同一个父节点，没有包含到所有的子节点，
如何解决这种情况呢 也是有解决方法的
代码如下（示例）：
set ROWCOUNT 0;
select a.ID, a.Name ,
(select b.ID,b.Name,
(select c.ID,c.Name from AdministrativeDivision c where c.ParentId=b.ID
for json path
) as child
from AdministrativeDivision b where a.ID=b.ParentId
for json path
) as child
from AdministrativeDivision a
where a.Name like '%湖北省%'
for json path
运行结果
[
{
"ID":420000,
"Name":"湖北省",
"child":[
{
"ID":420100,
"Name":"武汉市",
"child":[
{
"ID":420102,
"Name":"江岸区"
},
{
"ID":420103,
"Name":"江汉区"
},
{
"ID":420104,
"Name":"硚口区"
},
{
"ID":420105,
"Name":"汉阳区"
},
{
"ID":420106,
"Name":"武昌区"
},
{
"ID":420107,
"Name":"青山区"
},
{
"ID":420111,
"Name":"洪山区"
},
{
"ID":420112,
"Name":"东西湖区"
},
{
"ID":420113,
"Name":"汉南区"
},
{
"ID":420114,
"Name":"蔡甸区"
},
{
"ID":420115,
"Name":"江夏区"
},
{
"ID":420116,
"Name":"黄陂区"
},
{
"ID":420117,
"Name":"新洲区"
}
]
},
{
"ID":420200,
"Name":"黄石市",
"child":[
{
"ID":420202,
"Name":"黄石港区"
},
{
"ID":420203,
"Name":"西塞山区"
},
{
"ID":420204,
"Name":"下陆区"
},
{
"ID":420205,
"Name":"铁山区"
},
{
"ID":420222,
"Name":"阳新县"
},
{
"ID":420281,
"Name":"大冶市"
}
]
},
{
"ID":420300,
"Name":"十堰市",
"child":[
{
"ID":420302,
"Name":"茅箭区"
},
{
"ID":420303,
"Name":"张湾区"
},
{
"ID":420304,
"Name":"郧阳区"
},
{
"ID":420322,
"Name":"郧西县"
},
{
"ID":420323,
"Name":"竹山县"
},
{
"ID":420324,
"Name":"竹溪县"
},
{
"ID":420325,
"Name":"房县"
},
{
"ID":420381,
"Name":"丹江口市"
}
]
},
{
"ID":420500,
"Name":"宜昌市",
"child":[
{
"ID":420502,
"Name":"西陵区"
},
{
"ID":420503,
"Name":"伍家岗区"
},
{
"ID":420504,
"Name":"点军区"
},
{
"ID":420505,
"Name":"猇亭区"
},
{
"ID":420506,
"Name":"夷陵区"
},
{
"ID":420525,
"Name":"远安县"
},
{
"ID":420526,
"Name":"兴山县"
},
{
"ID":420527,
"Name":"秭归县"
},
{
"ID":420528,
"Name":"长阳土家族自治县"
},
{
"ID":420529,
"Name":"五峰土家族自治县"
},
{
"ID":420581,
"Name":"宜都市"
},
{
"ID":420582,
"Name":"当阳市"
},
{
"ID":420583,
"Name":"枝江市"
}
]
},
{
"ID":420600,
"Name":"襄阳市",
"child":[
{
"ID":420602,
"Name":"襄城区"
},
{
"ID":420606,
"Name":"樊城区"
},
{
"ID":420607,
"Name":"襄州区"
},
{
"ID":420624,
"Name":"南漳县"
},
{
"ID":420625,
"Name":"谷城县"
},
{
"ID":420626,
"Name":"保康县"
},
{
"ID":420682,
"Name":"老河口市"
},
{
"ID":420683,
"Name":"枣阳市"
},
{
"ID":420684,
"Name":"宜城市"
}
]
},
{
"ID":420700,
"Name":"鄂州市",
"child":[
{
"ID":420702,
"Name":"梁子湖区"
},
{
"ID":420703,
"Name":"华容区"
},
{
"ID":420704,
"Name":"鄂城区"
}
]
},
{
"ID":420800,
"Name":"荆门市",
"child":[
{
"ID":420802,
"Name":"东宝区"
},
{
"ID":420804,
"Name":"掇刀区"
},
{
"ID":420821,
"Name":"京山县"
},
{
"ID":420822,
"Name":"沙洋县"
},
{
"ID":420881,
"Name":"钟祥市"
}
]
},
{
"ID":420900,
"Name":"孝感市",
"child":[
{
"ID":420902,
"Name":"孝南区"
},
{
"ID":420921,
"Name":"孝昌县"
},
{
"ID":420922,
"Name":"大悟县"
},
{
"ID":420923,
"Name":"云梦县"
},
{
"ID":420981,
"Name":"应城市"
},
{
"ID":420982,
"Name":"安陆市"
},
{
"ID":420984,
"Name":"汉川市"
}
]
},
{
"ID":421000,
"Name":"荆州市",
"child":[
{
"ID":421002,
"Name":"沙市区"
},
{
"ID":421003,
"Name":"荆州区"
},
{
"ID":421022,
"Name":"公安县"
},
{
"ID":421023,
"Name":"监利县"
},
{
"ID":421024,
"Name":"江陵县"
},
{
"ID":421081,
"Name":"石首市"
},
{
"ID":421083,
"Name":"洪湖市"
},
{
"ID":421087,
"Name":"松滋市"
}
]
},
{
"ID":421100,
"Name":"黄冈市",
"child":[
{
"ID":421102,
"Name":"黄州区"
},
{
"ID":421121,
"Name":"团风县"
},
{
"ID":421122,
"Name":"红安县"
},
{
"ID":421123,
"Name":"罗田县"
},
{
"ID":421124,
"Name":"英山县"
},
{
"ID":421125,
"Name":"浠水县"
},
{
"ID":421126,
"Name":"蕲春县"
},
{
"ID":421127,
"Name":"黄梅县"
},
{
"ID":421181,
"Name":"麻城市"
},
{
"ID":421182,
"Name":"武穴市"
}
]
},
{
"ID":421200,
"Name":"咸宁市",
"child":[
{
"ID":421202,
"Name":"咸安区"
},
{
"ID":421221,
"Name":"嘉鱼县"
},
{
"ID":421222,
"Name":"通城县"
},
{
"ID":421223,
"Name":"崇阳县"
},
{
"ID":421224,
"Name":"通山县"
},
{
"ID":421281,
"Name":"赤壁市"
}
]
},
{
"ID":421300,
"Name":"随州市",
"child":[
{
"ID":421303,
"Name":"曾都区"
},
{
"ID":421321,
"Name":"随县"
},
{
"ID":421381,
"Name":"广水市"
}
]
},
{
"ID":422800,
"Name":"恩施土家族苗族自治州",
"child":[
{
"ID":422801,
"Name":"恩施市"
},
{
"ID":422802,
"Name":"利川市"
},
{
"ID":422822,
"Name":"建始县"
},
{
"ID":422823,
"Name":"巴东县"
},
{
"ID":422825,
"Name":"宣恩县"
},
{
"ID":422826,
"Name":"咸丰县"
},
{
"ID":422827,
"Name":"来凤县"
},
{
"ID":422828,
"Name":"鹤峰县"
}
]
},
{
"ID":429000,
"Name":"直辖县级",
"child":[
{
"ID":429004,
"Name":"仙桃市"
},
{
"ID":429005,
"Name":"潜江市"
},
{
"ID":429006,
"Name":"天门市"
},
{
"ID":429021,
"Name":"神农架林区"
}
]
}
]
}
]二、对Json基本操作
先给一段json字符串的代码
DECLARE @json NVARCHAR(MAX);
SET @json = N'[
{
"ID":420000,
"Name":"湖北省",
"child":[
{
"ID":420100,
"Name":"武汉市"
},
{
"ID":420200,
"Name":"黄石市"
},
{
"ID":420300,
"Name":"十堰市"
},
{
"ID":420500,
"Name":"宜昌市"
},
{
"ID":420600,
"Name":"襄阳市"
},
{
"ID":420700,
"Name":"鄂州市"
},
{
"ID":420800,
"Name":"荆门市"
},
{
"ID":420900,
"Name":"孝感市"
},
{
"ID":421000,
"Name":"荆州市"
},
{
"ID":421100,
"Name":"黄冈市"
},
{
"ID":421200,
"Name":"咸宁市"
},
{
"ID":421300,
"Name":"随州市"
},
{
"ID":422800,
"Name":"恩施土家族苗族自治州"
},
{
"ID":429000,
"Name":"直辖县级"
}
]
}
]';
declare @t table (
temp nvarchar(max)
)
insert into @t
select @json
1.判断给的字符串是否是Json格式
代码如下（示例）：
select isjson(temp) from @t 运行结果
返回1表示为json格式 返回0则不是
2.从 JSON 字符串中提取标量值
获取湖北省的ID
代码如下（示例）：
select JSON_VALUE(temp,'$[0].ID') from @t 运行结果
3. 从 JSON 字符串中提取对象或数组
获取黄石的节点
代码如下（示例）：
select JSON_QUERY(temp ,'$[0].child[1]' ) from @t 运行结果
4. 更新 JSON 字符串中属性的值，并返回已更新的 JSON 字符串
把湖北省的ID420000 改成 420001
代码如下（示例）：
select JSON_MODIFY(temp,'$[0].ID','420001') from @t
运行结果
三、Json转成表
1.使用OPENJSON WITH
代码如下（示例）：
DECLARE @json NVARCHAR(MAX);
SET @json = N'[
{
"ID":420000,
"Name":"湖北省"
}
]';
SELECT *
FROM OPENJSON(@json)
WITH (
ID INT 'strict $.ID',
Name NVARCHAR(50) '$.Name'
)
运行结果
2.多层嵌套的Json如何转成表呢
代码如下（示例）：
DECLARE @json NVARCHAR(MAX);
SET @json = N'
{
"ID":420000,
"Name":"湖北省",
"child":[
{
"ID":420100,
"Name":"武汉市"
},
{
"ID":420200,
"Name":"黄石市"
},
{
"ID":420300,
"Name":"十堰市"
},
{
"ID":420500,
"Name":"宜昌市"
},
{
"ID":420600,
"Name":"襄阳市"
},
{
"ID":420700,
"Name":"鄂州市"
},
{
"ID":420800,
"Name":"荆门市"
},
{
"ID":420900,
"Name":"孝感市"
},
{
"ID":421000,
"Name":"荆州市"
},
{
"ID":421100,
"Name":"黄冈市"
},
{
"ID":421200,
"Name":"咸宁市"
},
{
"ID":421300,
"Name":"随州市"
},
{
"ID":422800,
"Name":"恩施土家族苗族自治州"
},
{
"ID":429000,
"Name":"直辖县级"
}
]
}
';
SELECT ID,Name,ParentId,ParentName
FROM OPENJSON(@json)
WITH (
ParentId INT 'strict $.ID',
ParentName NVARCHAR(50) '$.Name',
Names NVARCHAR(max) '$.child' AS JSON
)
OUTER APPLY OPENJSON(Names) WITH (ID int '$.ID' , Name NVARCHAR(50) '$.Name');
运行结果
OUTER APPLY OPENJSON 将第一级实体与子数组联接，并返回平展的结果集。
总结
表和Json是可以做到相互转化的
表转json 使用for json path，json 转表 使用OPENJSON WITH
多层的json转表 OUTER APPLY OPENJSON
注意数据库对json的操作，serversql数据库的版本支持2016及以上
以上我是的总结内容，要想了解更多相关知识 ，查阅官方文档
在 SQL Server 中使用 JSON 数据 - SQL Server | Microsoft Learn