Add json-columns module: JSON columns in Hibernate 7.4.14 (@JdbcTypeCode(SqlTypes.JSON)), JSONB querying, GIN/expression indexes, dirty checking, Jackson 3 vs 2 on PostgreSQL 18.6 and MySQL 8.0.46

Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b6Kg9RWSTJzyz6KP9X
2026-10-30 17:00:46 +00:00
parent 98f4ed7411
commit b83cc9988e
51 changed files with 3178 additions and 0 deletions
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+
+== persist(): the INSERT Hibernate sends (one bind per JSON column)
+sql> insert into product (attributes,dimensions,name,specs,tags) values (?,?,?,?,?)
+sql> update product set attributes=?,dimensions=?,name=?,specs=?,tags=? where id=?
+
+== what PostgreSQL stored (jsonb text)
+attributes = {"color": "red", "price": 19.90, "ratio": 0.5, "stock": 12, "active": true, "nested": {"k": [1, 2, 3]}, "nothing": null, "bigNumber": 3000000000}
+tags = ["lighting", "office"]
+dimensions = {"depthMm": 180, "widthMm": 180, "heightMm": 420}
+specs = {"material": "steel", "weightKg": 1.8, "certifications": ["CE", "RoHS"]}
+
+== loaded back in a new session: Java types of the Map values
+color      -> String       red
+price      -> Double       19.9
+ratio      -> Double       0.5
+stock      -> Integer      12
+active     -> Boolean      true
+nested     -> LinkedHashMap {k=[1, 2, 3]}
+nothing    -> null         null
+bigNumber  -> Long         3000000000
+dimensions -> Dimensions[widthMm=180, heightMm=420, depthMm=180]
+specs      -> steel, 1.8, [CE, RoHS]
+
+== Java null vs JSON null vs empty
+null-attrs | attributes=SQL NULL | tags=SQL NULL | dimensions=SQL NULL
+empty-attrs | attributes={} | tags=[] | dimensions=SQL NULL
+loaded null-attrs  : attributes=null tags=null
+loaded empty-attrs : attributes={} tags=[]