how extract string into object - mysql

Question

I’m not sure how to explain this but I’ll write an example on how I can create a new data from this using SQL. this is from MongoDb database and I can't change any thing. I was hoping if any one Knows how to execute this using the Select method.
SELECT * FROM mytable
Original data
[{
"id": "2433-10",
"busiName": "ABC",
"srTypeId": "2433-10",
"nodeType": "0",
"pathName": "home",
"busiSort": 10,
"SampleInfo": "1:sql test question identifiers: itemid:12345;itemname:Ford;itemid:12345; itemlocation=USA/itemDate=2014",
"superTypeId": "002",}]
I want extract just SampleInfo into New data
[{
"1":"sql test question identifiers"
"itemid":"12345";
"itemname":"Ford";
"iteminfo":"it's car";
"itemlocation ":"USA";
"itemDate":"2014";
}]

Answer 1

With some initial sanitization(replacing "=" with ":" and "/" with ";") maybe this is what you need:
( This is assuming that you have only single delimiter between the key/values and single delimiter between key and value )
db.collection.aggregate([
{
$addFields: {
newData: {
"$arrayToObject": {
"$map": {
"input": {
$split: [
"$SampleInfo",
";"
]
},
"as": "newD",
"in": {
"$split": [
"$$newD",
":"
]
}
}
}
}
}
}
])
Explained:
Split the SampleInfo based on delimiter ";" ( considering you have "key1:value1;key2:value2;key3:value3" in new array called newData.
Split the keys and values based on the key/value delimiter ":" , convert them to "key":"value" pair in the newData array field.
playground just aggregation
( If you want to just parse and output )
playground update + agg pipleine 4.2+
( If you want to parse and store back to the database under new field: newData )
But afcourse prefered option as suggested above is to sanitize and parse the data before inserting it to the database ...
Same thing via JavaScript Example:
mongos> function stringToObj (string) { var obj = {}; var stringArray = string.split(';'); for(var i = 0; i < stringArray.length; i++){ var kvp = stringArray[i].split(':'); if(kvp[1]){ obj[kvp[0]] = kvp[1] } } return obj; }
mongos> db.collection.find().forEach(function(d){ d.newData=stringToObj(d.SampleInfo);db.collection.save(d); } )
mongos>
Explained:
Define JS function stringToObj ( Converting the string to object )
Loop over all documents via forEach and use the function to parse and modify the document adding new field newData with the content.