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 2select * 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 2select * 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 1select * 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
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