How to edit a JSON document in MySQL
- 3 minutes read - 588 wordsYou can edit a JSON document in MySQL with:
- The
JSON_SET
function that will replace values for JSON paths that exists and add values for the ones that don’t exist. - The
JSON_REPLACE
function that will replace values for JSON paths that exists and ignore the ones that don’t exist.
NOTE: more info is available in the MySQL JSON functions documentation page
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The dataset
The dataset is the following:
{
"id": 778,
"shop": "Luigis Pizza",
"name": "Edward Olson",
"phoneNumbers":
["(935)503-3765x4154","(935)12345"],
"address": "Unit 9398 Box 2056 DPO AP 24022",
"image": null,
"pizzas": [
{
"pizzaName": "Salami",
"additionalToppings": ["🥓", "🌶️"]
},
{
"pizzaName": "Margherita",
"additionalToppings": ["🍌", "🌶️", "🍍"]
}
]
}
Check out the description of the fields
The following examples use a pizza order dataset with an order having:id
: 778shop
: “Luigis Pizza”name
: “Edward Olson”phoneNumbers
:["(935)503-3765x4154","(935)12345"]address
: “Unit 9398 Box 2056 DPO AP 24022”image
: null- and two pizzas contained in the
pizzas
item:
[
{
"pizzaName": "Salami",
"additionalToppings": ["🥓", "🌶️"]
},
{
"pizzaName": "Margherita",
"additionalToppings": ["🍌", "🌶️", "🍍"]
}
]
If you want to reproduce the examples, check how to recreate the dataset
It can be recreated with the following script:
create table test(id serial primary key, json_data json);
insert into test(json_data) values (
'{
"id": 778,
"shop": "Luigis Pizza",
"name": "Edward Olson",
"phoneNumbers":
["(935)503-3765x4154","(935)12345"],
"address": "Unit 9398 Box 2056 DPO AP 24022",
"image": null,
"pizzas": [
{
"pizzaName": "Salami",
"additionalToppings": ["🥓", "🌶️"]
},
{
"pizzaName": "Margherita",
"additionalToppings": ["🍌", "🌶️", "🍍"]
}
]
}');
Edit a JSON document with JSON_SET
function
To edit a JSON document you can use the JSON_SET
function. To replace the second pizzaName
from Margherita
to Capricciosa
you can
select
JSON_SET(json_data,'$.pizzas[1].pizzaName','Capricciosa') from test;
Where
json_data
is the JSON column$.pizzas[1].pizzaName
selects thepizzas
item, the 2nd element in the array and thepizzaName
subitem- the last parameter
Capricciosa
represents the value to replace
Result
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| {"id": 778, "name": "Edward Olson", "shop": "Luigis Pizza", "image": null, "pizzas": [{"pizzaName": "Salami", "additionalToppings": ["🥓", "🌶️"]}, {"pizzaName": "Capricciosa", "additionalToppings": ["🍌", "🌶️", "🍍"]}], "address": "Unit 9398 Box 2056 DPO AP 24022", "phoneNumbers": ["(935)503-3765x4154", "(935)12345"]} |
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
Edit a JSON document with JSON_REPLACE
function
To edit a JSON document you can use the JSON_REPLACE
function. To replace the second pizzaName
from Margherita
to Capricciosa
you can
select
JSON_REPLACE(json_data,'$.pizzas[1].pizzaName','Capricciosa') from test;
Where
json_data
is the JSON column$.pizzas[1].pizzaName
selects thepizzas
item, the 2nd element in the array and thepizzaName
subitem- the last parameter
Capricciosa
represents the value to replace
Result
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| JSON_REPLACE(json_data,'$.pizzas[1].pizzaName','Capricciosa') |
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| {"id": 778, "name": "Edward Olson", "shop": "Luigis Pizza", "image": null, "pizzas": [{"pizzaName": "Salami", "additionalToppings": ["🥓", "🌶️"]}, {"pizzaName": "Capricciosa", "additionalToppings": ["🍌", "🌶️", "🍍"]}], "address": "Unit 9398 Box 2056 DPO AP 24022", "phoneNumbers": ["(935)503-3765x4154", "(935)12345"]} |
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
Note: If you try to use the JSON_REPLACE
with a non existing field, like the $.nameS
, the function will NOT edit the document.
select
JSON_REPLACE(json_data,'$.nameS','Ugo') from test;
The above doesn’t edit the document since the key nameS
is not present
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| JSON_REPLACE(json_data,'$.nameS','Ugo') |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| {"id": 778, "name": "Edward Olson", "shop": "Luigis Pizza", "image": null, "pizzas": [{"pizzaName": "Salami", "additionalToppings": ["🥓", "🌶️"]}, {"pizzaName": "Margherita", "additionalToppings": ["🍌", "🌶️", "🍍"]}], "address": "Unit 9398 Box 2056 DPO AP 24022", "phoneNumbers": ["(935)503-3765x4154", "(935)12345"]} |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
Review all the JSON MySQL use-cases listed in the main page