text to hstore migration
in postgresql 8.2, in contrib, is great new datatype called hstore. if you're not familiar with it – check the docs. in short – this is indexable associative-array (hash) in one field. i was given a...
View ArticleDeserialization of hstore data structure in Perl
You might be familiar with hstore datatype in PostgreSQL – if you're not – check it out, as it is really cool. Basically it's hash in database, which you can search in. This is how it looks: # \d x...
View ArticleWaiting for 8.5 – changes in hstore
Andrew Gierth (RhodiumToad on irc) wrote, and Tom Lane committed: Assorted improvements in contrib/hstore. Remove the 64K limit on the lengths of keys and values within an hstore. (This changes the...
View ArticleWaiting for 9.3 – JSON generation improvements.
On 10th of March, Andrew Dunstan committed patch: JSON generation improvements. This adds the following: json_agg(anyrecord) -> json to_json(any) -> json hstore_to_json(hstore) -> json...
View ArticleWaiting for 9.5 – Add transforms feature
On 26th of April, Peter Eisentraut committed patch: Add transforms feature This provides a mechanism for specifying conversions between SQL data types and procedural languages. As examples, there are...
View ArticleWaiting for PostgreSQL 14 – Allow subscripting of hstore values.
On 11st of December 2020, Tom Lane committed patch: Allow subscripting of hstore values. This is basically a finger exercise to prove that it's possible for an extension module to add subscripting...
View ArticleGetting value from dynamic column in pl/PgSQL triggers?
Every so often, on irc, someone asks how to get value from column that is passed as argument. This is generally seen as not possible, as pl/PgSQL doesn't have support for dynamic column names. We can...
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