![]() Side note: that solution came out of a pair programming session with Lucas Cegatti.Īre you looking for a creative company to implement your next idea? Check out LNA Systems and let’s talk. That brings a cost that you have to consider when deciding which tools you pick to use. But keep in mind that you also need to query and update this kind of data. JSONB is a great and valuable tool to resolve a lot of problems. The above selects will return: because that’s the type expected on the jsonb_path function. Given a jsonb column, you can set a new value on the specified path: Reference: PostgreSQL Json functions ![]() Jsonb_set(target jsonb, path text, new_value jsonb) If the argument is null, the result is null. The text cannot contain - or end with a -, otherwise the resulting construct would not be a valid XML comment. Pretty easy right? But how can you update a specific contact for a specific customer? How to change Jimi's email or Janis’ phone?įortunately, PostgreSQL is your friend and provides the jsonb_set function: The function xmlcomment creates an XML value containing an XML comment with the specified text as content. Then you create a customers table with a JSONB contacts column and insert some data into it: Then you come up with the idea of storing the contacts as a JSONB column because they’re dynamic, and thus using a not relational data structure makes sense. Suppose you’re implementing a customer screen to store dynamic contacts for each customer. TL DR: the final query is at the end of the article, and you can check out a live example at DB Fiddle to copy & paste and play with. In this article let’s see how to update a specific value of an object inside an array with one query. But, you just created another problem: performance bottlenecks and resource waste. Using Posix style escape sequences works, too, of course. Aside: the canonical (and SQL standard) way to escape single quotes ( ') in string literals is to double them ( '' ). JSONB is a powerful tool, but it comes at some cost because you need to adapt the way you query and handle the data.Īnd it’s not rare to load the entire jsonb object into memory, transform it using your preferred programming language, and then saving it back to the database. To achieve the same with regexpreplace (), add an optional 4th parameter: UPDATE tbl SET col regexpreplace (col, '''', '', 'g') 'g' for 'globally'. Let’s say you decided to store data in the database as json or jsonb and discovered that you just created new problems for yourself that you didn’t have before. I'm trying to replace all values in a column where the value is 0 with NULL SELECT score REPLACE(score, 0, ISNULL) FROM kpis WHERE score0 or SELECT score REPLACE(score, 0, ISNULL) FROM kpis But. By Leandro Cesquini Pereira How to update objects inside JSONB arrays with PostgreSQL Photo by Jan Antonin Kolar on Unsplash How to update a specific value on a JSONB array
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