MariaDB parse a JSON String - parsing

Question

This works in SQL Server:
declare #jstring varchar(max)='{
"FieldInfo": {
"Template": "Babies",
"Groups": [{
"Group": "Required",
"SortOrder": 1,
"BackgroundColor": "FCD5B4",
"Fields": [{
"fieldName": "feed_product_type",
"SortOrder": 1,
"labelName": "Product Type",
"defaultValue": "",
"columnIndex": 0
}, {
"fieldName": "item_sku",
"SortOrder": 2,
"labelName": "Seller SKU",
"defaultValue": "",
"columnIndex": 1
}, {
"fieldName": "brand_name",
"SortOrder": 3,
"labelName": "Brand",
"defaultValue": "",
"columnIndex": 2
}, {
"fieldName": "item_name",
"SortOrder": 4,
"labelName": "Title",
"defaultValue": "",
"columnIndex": 3
}, {
"fieldName": "external_product_id",
"SortOrder": 5,
"labelName": "Product ID",
"defaultValue": "",
"columnIndex": 4
}, {
"fieldName": "external_product_id_type",
"SortOrder": 6,
"labelName": "Product ID Type",
"defaultValue": "",
"columnIndex": 5
}, {
"fieldName": "item_type",
"SortOrder": 7,
"labelName": "Item Type Keyword",
"defaultValue": "",
"columnIndex": 6
}, {
"fieldName": "model",
"SortOrder": 8,
"labelName": "Model Number",
"defaultValue": "",
"columnIndex": 7
}, {
"fieldName": "manufacturer",
"SortOrder": 9,
"labelName": "Manufacturer",
"defaultValue": "",
"columnIndex": 8
}, {
"fieldName": "part_number",
"SortOrder": 10,
"labelName": "Part Number",
"defaultValue": "",
"columnIndex": 9
}, {
"fieldName": "mfg_minimum",
"SortOrder": 11,
"labelName": "Minimum Manufacturer Age Recommended",
"defaultValue": "",
"columnIndex": 10
}, {
"fieldName": "standard_price",
"SortOrder": 12,
"labelName": "Standard Price",
"defaultValue": "",
"columnIndex": 11
}, {
"fieldName": "quantity",
"SortOrder": 13,
"labelName": "Quantity",
"defaultValue": "",
"columnIndex": 12
}, {
"fieldName": "main_image_url",
"SortOrder": 14,
"labelName": "Main Image URL",
"defaultValue": "",
"columnIndex": 13
}]
}, {
"Group": "Images",
"SortOrder": 2,
"BackgroundColor": "FFFF00",
"Fields": [{
"fieldName": "other_image_url1",
"SortOrder": 15,
"labelName": "Other Image URL1",
"defaultValue": "",
"columnIndex": 14
}, {
"fieldName": "other_image_url2",
"SortOrder": 16,
"labelName": "Other Image URL2",
"defaultValue": "",
"columnIndex": 15
}, {
"fieldName": "other_image_url3",
"SortOrder": 17,
"labelName": "Other Image URL3",
"defaultValue": "",
"columnIndex": 16
}, {
"fieldName": "other_image_url4",
"SortOrder": 18,
"labelName": "Other Image URL4",
"defaultValue": "",
"columnIndex": 17
}, {
"fieldName": "other_image_url5",
"SortOrder": 19,
"labelName": "Other Image URL5",
"defaultValue": "",
"columnIndex": 18
}, {
"fieldName": "other_image_url6",
"SortOrder": 20,
"labelName": "Other Image URL6",
"defaultValue": "",
"columnIndex": 19
}, {
"fieldName": "other_image_url7",
"SortOrder": 21,
"labelName": "Other Image URL7",
"defaultValue": "",
"columnIndex": 20
}, {
"fieldName": "other_image_url8",
"SortOrder": 22,
"labelName": "Other Image URL8",
"defaultValue": "",
"columnIndex": 21
}, {
"fieldName": "swatch_image_url",
"SortOrder": 23,
"labelName": "Swatch Image URL",
"defaultValue": "",
"columnIndex": 22
}]
}, {
"Group": "Variation",
"SortOrder": 3,
"BackgroundColor": "FF8080",
"Fields": [{
"fieldName": "parent_child",
"SortOrder": 24,
"labelName": "Parentage",
"defaultValue": "",
"columnIndex": 23
}, {
"fieldName": "relationship_type",
"SortOrder": 25,
"labelName": "Relationship Type",
"defaultValue": "",
"columnIndex": 24
}, {
"fieldName": "parent_sku",
"SortOrder": 26,
"labelName": "Parent SKU",
"defaultValue": "",
"columnIndex": 25
}, {
"fieldName": "variation_theme",
"SortOrder": 27,
"labelName": "Variation Theme",
"defaultValue": "",
"columnIndex": 26
}]
}, {
"Group": "Basic",
"SortOrder": 4,
"BackgroundColor": "F8A45E",
"Fields": [{
"fieldName": "update_delete",
"SortOrder": 28,
"labelName": "Update Delete",
"defaultValue": "",
"columnIndex": 27
}, {
"fieldName": "product_description",
"SortOrder": 29,
"labelName": "Description",
"defaultValue": "",
"columnIndex": 28
}, {
"fieldName": "care_instructions",
"SortOrder": 30,
"labelName": "Care Instructions",
"defaultValue": "",
"columnIndex": 29
}, {
"fieldName": "target_gender",
"SortOrder": 31,
"labelName": "Target Gender",
"defaultValue": "",
"columnIndex": 30
}, {
"fieldName": "edition",
"SortOrder": 32,
"labelName": "Edition",
"defaultValue": "",
"columnIndex": 31
}]
}]
}
}'
--drop table #AmazonTemplateInfo
;with FieldInfo as (
select Template,[Group],GroupSort,BackgroundColor,FieldName,FieldSort,LabelName,DefaultValue,ColumnIndex from OPENJSON(#jstring,'$.FieldInfo')
With (
Template varchar(50)
,Groups nvarchar(max) as json
) as Template
cross apply openjson (Template.Groups)
with (
[Group] varchar(50)
,BackgroundColor varchar(6)
,GroupSort int '$.SortOrder'
,Fields nvarchar(max) as json
) Groups
cross apply openjson(Groups.Fields)
with (
fieldName varchar(50)
,FieldSort int '$.SortOrder'
,labelName varchar(50)
,defaultValue varchar(max)
,columnIndex int
) Fields
)
select * from FieldInfo
This generates a table in the form
Template
Group
GroupSort
BackgroundColor
FieldName
FieldSort
LabelName
DefaultValue
ColumnIndex
Babies
Required
1
FCD5B4
feed_product_type
1
Product Type
0
I need to create the same functionality in MariaDB v10. I've tried using JSON_EXTRACT and the LATERAL statement for my cross applies, but nothing is working. JSON_EXTRACT seems to just create a JSON string from the selected columns.
Is this pointless in MariaDB? Is there any way to do this?

Answer 1

MySQL has a feature that is close to what you're describing, it's the JSON_TABLE() function. See documentation and examples:
https://dev.mysql.com/doc/refman/8.0/en/json-table-functions.html
https://mysqlserverteam.com/json_table-the-best-of-both-worlds/
However, you said you're using "v10" which is a MariaDB version number, not a MySQL version number. MariaDB and MySQL are different software products. They had a common origin of source code in 2010, but they have been slowly diverging since then. In that way, it's a bit like comparing Microsoft SQL Server to Sybase.
No version of MariaDB at least up to 10.5 implements the JSON_TABLE() function. Perhaps some future version will.
https://mariadb.com/kb/en/json_table-support/

Answer 2

Well...finally. In case anyone is interested, this is how I parsed a multi-level JSON string in MariaDB:
set #jstring='{"FieldInfo": {"Template": "Babies","Groups": [{"Group": "Required","SortOrder": 1,"BackgroundColor": "FCD5B4","Fields": [{"fieldName": "feed_product_type","SortOrder": 1,"labelName": "Product Type","defaultValue": "","columnIndex": 0}, {"fieldName": "item_sku","SortOrder": 2,"labelName": "Seller SKU","defaultValue": "","columnIndex": 1}, {"fieldName": "brand_name","SortOrder": 3,"labelName": "Brand","defaultValue": "","columnIndex": 2}, {"fieldName": "item_name","SortOrder": 4,"labelName": "Title","defaultValue": "","columnIndex": 3}, {"fieldName": "external_product_id","SortOrder": 5,"labelName": "Product ID","defaultValue": "","columnIndex": 4}, {"fieldName": "external_product_id_type","SortOrder": 6,"labelName": "Product ID Type","defaultValue": "","columnIndex": 5}, {"fieldName": "item_type","SortOrder": 7,"labelName": "Item Type Keyword","defaultValue": "","columnIndex": 6}, {"fieldName": "model","SortOrder": 8,"labelName": "Model Number","defaultValue": "","columnIndex": 7}, {"fieldName": "manufacturer","SortOrder": 9,"labelName": "Manufacturer","defaultValue": "","columnIndex": 8}, {"fieldName": "part_number","SortOrder": 10,"labelName": "Part Number","defaultValue": "","columnIndex": 9}, {"fieldName": "mfg_minimum","SortOrder": 11,"labelName": "Minimum Manufacturer Age Recommended","defaultValue": "","columnIndex": 10}, {"fieldName": "standard_price","SortOrder": 12,"labelName": "Standard Price","defaultValue": "","columnIndex": 11}, {"fieldName": "quantity","SortOrder": 13,"labelName": "Quantity","defaultValue": "","columnIndex": 12}, {"fieldName": "main_image_url","SortOrder": 14,"labelName": "Main Image URL","defaultValue": "","columnIndex": 13}]}, {"Group": "Images","SortOrder": 2,"BackgroundColor": "FFFF00","Fields": [{"fieldName": "other_image_url1","SortOrder": 15,"labelName": "Other Image URL1","defaultValue": "","columnIndex": 14}, {"fieldName": "other_image_url2","SortOrder": 16,"labelName": "Other Image URL2","defaultValue": "","columnIndex": 15}, {"fieldName": "other_image_url3","SortOrder": 17,"labelName": "Other Image URL3","defaultValue": "","columnIndex": 16}, {"fieldName": "other_image_url4","SortOrder": 18,"labelName": "Other Image URL4","defaultValue": "","columnIndex": 17}, {"fieldName": "other_image_url5","SortOrder": 19,"labelName": "Other Image URL5","defaultValue": "","columnIndex": 18}, {"fieldName": "other_image_url6","SortOrder": 20,"labelName": "Other Image URL6","defaultValue": "","columnIndex": 19}, {"fieldName": "other_image_url7","SortOrder": 21,"labelName": "Other Image URL7","defaultValue": "","columnIndex": 20}, {"fieldName": "other_image_url8","SortOrder": 22,"labelName": "Other Image URL8","defaultValue": "","columnIndex": 21}, {"fieldName": "swatch_image_url","SortOrder": 23,"labelName": "Swatch Image URL","defaultValue": "","columnIndex": 22}]}, {"Group": "Variation","SortOrder": 3,"BackgroundColor": "FF8080","Fields": [{"fieldName": "parent_child","SortOrder": 24,"labelName": "Parentage","defaultValue": "","columnIndex": 23}, {"fieldName": "relationship_type","SortOrder": 25,"labelName": "Relationship Type","defaultValue": "","columnIndex": 24}, {"fieldName": "parent_sku","SortOrder": 26,"labelName": "Parent SKU","defaultValue": "","columnIndex": 25}, {"fieldName": "variation_theme","SortOrder": 27,"labelName": "Variation Theme","defaultValue": "","columnIndex": 26}]}, {"Group": "Basic","SortOrder": 4,"BackgroundColor": "F8A45E","Fields": [{"fieldName": "update_delete","SortOrder": 28,"labelName": "Update Delete","defaultValue": "","columnIndex": 27}, {"fieldName": "product_description","SortOrder": 29,"labelName": "Description","defaultValue": "","columnIndex": 28}, {"fieldName": "care_instructions","SortOrder": 30,"labelName": "Care Instructions","defaultValue": "","columnIndex": 29}, {"fieldName": "target_gender","SortOrder": 31,"labelName": "Target Gender","defaultValue": "","columnIndex": 30}, {"fieldName": "edition","SortOrder": 32,"labelName": "Edition","defaultValue": "","columnIndex": 31}]}]}}'
;with t1 as (
select JSON_Value(#jstring,'$.FieldInfo.Template') as Template, JSON_Query(#jstring,'$.FieldInfo.Groups') as jStringGroups
)
SELECT Template,jstringGroups into #Template, #jStringGroups from t1;
set #numGroups=JSON_Length(#jStringGroups,'$');
SET max_recursive_iterations=100000;
;with recursive t2 as (
select 0 curLev
, #Template Template
, #jStringGroups jStringGroups
, JSON_Value(#jStringGroups,'$[0].Group') 'Group'
,cast(JSON_Value(#jStringGroups,'$[0].SortOrder') as int) GroupSort
,JSON_Value(#jStringGroups,'$[0].BackgroundColor') BackgroundColor
,JSON_Query(#jStringGroups,'$[0].Fields') fieldString
,CAST(JSON_Length(JSON_Query(#jStringGroups,'$[0].Fields'),'$') as int) numFields
UNION
select t2.curLev+1
, t2.Template
, t2.jStringGroups
, JSON_Value(t2.jStringGroups,CONCAT('$[',t2.curLev+1,'].Group'))
, JSON_Value(t2.jStringGroups,CONCAT('$[',t2.curLev+1,'].SortOrder'))
, JSON_Value(t2.jStringGroups,CONCAT('$[',t2.curLev+1,'].BackgroundColor'))
, JSON_Query(t2.jStringGroups,CONCAT('$[',t2.curLev+1,'].Fields'))
, JSON_Length(JSON_Query(t2.jStringGroups,CONCAT('$[',t2.curLev+1,'].Fields')),'$')
from t2 where t2.curLev+1<#numGroups
),
t3 as (
select 0 curLev
,Template
,t2.Group
,GroupSort
,BackgroundColor
,fieldString
,numfields
,JSON_Value(t2.fieldString,'$[0].fieldName') fieldName
,cast(JSON_Value(t2.fieldString,'$[0].SortOrder') as int) fieldSort
,JSON_Value(t2.fieldString,'$[0].labelName') labelName
,JSON_Value(t2.fieldString,'$[0].defaultValue') defaultValue
,cast(JSON_Value(t2.fieldString,'$[0].columnIndex') as int) columnIndex
from t2
UNION
select t3.curLev+1
,t3.Template
,t3.Group
,t3.GroupSort
,t3.BackgroundColor
,t3.fieldString
,t3.numfields
,JSON_Value(t3.fieldString,CONCAT('$[',t3.curLev+1,'].fieldName'))
,JSON_Value(t3.fieldString,CONCAT('$[',t3.curLev+1,'].SortOrder'))
,JSON_Value(t3.fieldString,CONCAT('$[',t3.curLev+1,'].labelName'))
,JSON_Value(t3.fieldString,CONCAT('$[',t3.curLev+1,'].defaultValue'))
,JSON_Value(t3.fieldString,CONCAT('$[',t3.curLev+1,'].columnIndex'))
from t3
where t3.curLev+1<t3.numFields
)
select Template,t3.Group,GroupSort,FieldName,FieldSort,LabelName,DefaultValue,ColumnIndex from t3 order by GroupSort, fieldSort;
This got me my table.