I'm trying to insert JSON into a Postgresql column who's data type is JSON, but I'm having trouble finding how I can do this. This is as far as I've gotten but it's not correct because it just overwrites it every time, instead of adding a new key pair.
I'm using pg-promise node module to perform these queries. Here's what I have so far:
db.query("UPDATE meditation_database SET completed=$1 WHERE user_id=$2", [{myVar : true}, user_id]);
Also 'myVar' should be updated to the variable value, but instead it treats it as a string. How can I get the actual value of 'myVar' instead of it being treated literally.
Thanks,
I'm trying to insert JSON into a Postgresql column who's data type is JSON, but I'm having trouble finding how I can do this.
By executing this:
db.query("INSERT INTO meditation_database(completed, user_id) VALUES($1, $2)",
[{myVar : true}, user_id]);
Also 'myVar' should be updated to the variable value, but instead it treats it as a string. How can I get the actual value of 'myVar' instead of it being treated literally.
myVar is serialized into JSON as a string, that's the proper JSON format for property names, and is the only format that PostgreSQL will accept.
This is as far as I've gotten but it's not correct because it just overwrites it every time, instead of adding a new key pair.
If you are asking how to update JSON in PostgreSQL, this question has been answered previously, and in great detail: How do I modify fields inside the new PostgreSQL JSON datatype?
Related
So I have three databases - an Oracle one, SQL Server one, and a Postgres one. I have a table that has two columns: name, and value, both are texts. The value is a stringified JSON object. I need to update the nested value.
This is what I currently have:
name: 'MobilePlatform',
value:
'{
"iosSupported":true,
"androidSupported":false,
}'
I want to add {"enableTwoFactorAuth": false} into it.
In PostgreSQL you should be able to do this:
UPDATE mytable
SET MobilePlatform = jsonb_set(MobilePlatform::jsonb, '{MobilePlatform,enableTwoFactorAuth}', 'false');
In Postgres, the plain concatenation operator || for jsonb could do it:
UPDATE mytable
SET value = value::jsonb || '{"enableTwoFactorAuth":false}'::jsonb
WHERE name = 'MobilePlatform';
If a top-level key "enableTwoFactorAuth" already exists, it is replaced. So it's an "upsert" really.
Or use jsonb_set() for manipulating nested values.
The cast back to text works implicitly as assignment cast. (Results in standard format; any insignificant whitespace is removed effectively.)
If the content is valid JSON, the storage type should be json to begin with. In Postges, jsonb would be preferable as it's easier to manipulate, but that's not directly portable to the other two RDBMS mentioned.
(Or, possibly, a normalized design without JSON altogether.)
For ORACLE 21
update mytable
set json_col = json_transform(
json_col,
INSERT '$.value.enableTwoFactorAuth' = 'false'
)
where json_exists(json_col, '$?(#.name == "MobilePlatform")')
;
With json_col being JSON or VARCHAR2|CLOB column with IS JSON constraint.
(but must be JSON if you want a multivalue index on json_value.name:
create multivalue index ix_json_col_name on mytable t ( t.json_col.name.string() );
)
Two of the databases you are using support JSON data type, so it doesn't make sense to have them as stringified JSON object in a Text column.
Oracle: https://docs.oracle.com/en/database/oracle/oracle-database/21/adjsn/json-in-oracle-database.html
PostgreSQL: https://www.postgresql.org/docs/current/datatype-json.html
Apart from these, MSSQL Server also provides methods to work with JSON data type.
MS SQL Server: https://learn.microsoft.com/en-us/sql/relational-databases/json/json-data-sql-server?view=sql-server-ver16
Using a JSON type column in any of the above databases would enable you to use their JSON functions to perform the tasks that you are looking for.
If you've to use Text only then you can use replace to add the key-value pair at the end of your JSON
update dataTable set value = REPLACE(value, '}',",\"enableTwoFactorAuth\": false}") where name = 'MobilePlatform'
Here dataTable is the name of table.
The cleaner and less riskier way would be connect to db using the application and use JSON methods such as JSON.parse in Javascript and JSON.loads in Python. This would give you the JSON object (dictionary in case of Python) to work on. You can look for similar methods in other languages as well.
But i would suggest, if possible use JSON columns instead of Text to store the JSON value wherever possible.
I am asked to enter a stringified json value in a column named show_cast in the format of Release: and Date: but I don't have any idea how to do that.
The table simply contains of three columns a token , time and genre. The time has to be a stringified json.
I tried to simply put that using { and simple : but that doesn't seem to work. They say that {{release:,time:},{release:,date:},,,,} should be converted in stringify and then inserted into the database. I don't know how to do that and I don't see any resource like this out there. To be honest I didn't even know about this until I was given this task.
insert into show_reality values("project_123","{{release:2017,date:04-11},{release:2019,date:12-03}}","Action");
I have done this but I don't think it is a stringified json.
Thanks in Advance.
How to set value in MySQL(5.6) column if that contains JSON document as a string
For example, if we have a table - user in that we have three columns id, name and jsonConfig and column jsonConfig contains data as a JSON document
{"key1":"val1","key2":"val2","key3":"val3"}
I would like to replace the value of val1 let's say to val4 for jsonConfig column
Can we do that using MySQL(5.6) queries?
I don't thing their is direct way to do this like in later version alot of json support was added like JSON_EXTRACT, JSON_CONTAINS etc.You might have to write your own custom function.
With MySQL 5.6, since it does not have the JSON data type or the supporting functions, you are going to have to replace the entire string via an UPDATE query if you want to change any part of the JSON document in your string.
Using MySQL 5.7, how to set the value of a JSON key in a JSON column to a JSON object rather than a string.
I used this query:
SELECT json_set(profile, '$.twitter', '{"key1":"val1", "key2":"val2"}')
from account WHERE id=2
Output:
{"twitter": "{\"key1\":\"val1\", \"key2\":\"val2\"}", "facebook": "value", "googleplus": "google_val"}
But it seems like it considers it as a string since the output escapes the JSON characters in it. Is it possible to do that without using JSON_OBJECT()?
There's a couple of options that I know of:
Use the JSON_UNQUOTE function to unquote the output (ie not cast it to string) as documented here
Possibly use the ->> operator and select a specific path, documented here
Has a lot of implications, but you could disable backslashes as an escape character. I haven't tried this, so I don't even know if that works, but it's mentioned in the docs
On balance, I'd either use the ->> operator, or handle the conversion on the client side, depending on what you want to do.
I downloaded solr 4.6.1 and I am attempting to update the solr index using the following via command line:
curl http://localhost:8983/solr/update?commit=true -H 'Content-type:application/json' -d '
[{
"id" : "1",
"phoneNumber_ss": [{"foo_ss" : "bar"}]
}]
'
I am using the example schema.xml, which is why i used all the "_ss" fields.
The issue is that when I execute this I get the following response:
{"responseHeader":{"status":400,"QTime":1},"error":{"msg":"Error parsing JSON field value. Unexpected OBJECT_START","code":400}}
This seems to be related to the value specified for phoneNumber_ss field which is an array of objects. If I make the value into an array or an object it works fine, its only when it is an array of objects that the issue occurs.
Any help is much appreciated.
I don't think Solr support storing objects into a multivalued field. You can store it as a array of string. You might also store the object as a string and parse it in your application.
If you have such use case that you want to have all the objects from Solr only, you can follow the steps..
Create a multivalued field for your keys.
Maintain the same order of keys and create another multivalued field for values.
So, you can get the keys and values in same order in different fields. But in this approach you might face problems while updating those multivalued fields. You might want to look here
And finally, you are also missing some syntax in your update statement.
set – set or replace a particular value, or remove the value if null is specified as the new value
add – adds an additional value to a list
Check http://wiki.apache.org/solr/UpdateJSON