Claude
b83cc9988e
Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b6Kg9RWSTJzyz6KP9X
45 lines
2.7 KiB
Plaintext
45 lines
2.7 KiB
Plaintext
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== baseline: persist a Product whose Map holds only JSON-native Java types (String, Integer, Double, Map, List)
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sql> insert into product (attributes,dimensions,name,specs,tags) values (?,?,?,?,?)
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== load, change nothing, commit
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UPDATE statements: 0
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== in-place mutations: load, mutate the object graph, commit, count UPDATEs
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attributes.put("color", "blue") -> 1 UPDATE
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update product set attributes=?,dimensions=?,name=?,specs=?,tags=? where id=?
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attributes.remove("stock") -> 1 UPDATE
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update product set attributes=?,dimensions=?,name=?,specs=?,tags=? where id=?
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((Map) attributes.get("nested")).put("k2", 1) [nested map] -> 1 UPDATE
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update product set attributes=?,dimensions=?,name=?,specs=?,tags=? where id=?
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((List) nested.get("k")).add(4) [list inside map] -> 1 UPDATE
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update product set attributes=?,dimensions=?,name=?,specs=?,tags=? where id=?
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tags.add("c") -> 1 UPDATE
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update product set attributes=?,dimensions=?,name=?,specs=?,tags=? where id=?
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specs.setMaterial("brass") [POJO setter] -> 1 UPDATE
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update product set attributes=?,dimensions=?,name=?,specs=?,tags=? where id=?
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specs.getCertifications().add("UL") [list inside POJO] -> 1 UPDATE
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update product set attributes=?,dimensions=?,name=?,specs=?,tags=? where id=?
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setDimensions(new Dimensions(9,9,9)) [record replaced] -> 1 UPDATE
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update product set attributes=?,dimensions=?,name=?,specs=?,tags=? where id=?
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setDimensions(equal record) [no real change] -> 0 UPDATE
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== the changes really reached the database
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attributes = {"color": "blue", "price": 19.9, "nested": {"k": [1, 2, 3, 4], "k2": 1}}
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tags = ["a", "b", "c"]
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specs = {"material": "brass", "weightKg": 1.8, "certifications": ["CE", "UL"]}
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== spurious UPDATEs: nothing changed, Hibernate writes anyway
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persist() with attributes.price = new BigDecimal("19.90") -> 1 UPDATE right after the INSERT
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sql> insert into product (attributes,dimensions,name,specs,tags) values (?,?,?,?,?)
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sql> update product set attributes=?,dimensions=?,name=?,specs=?,tags=? where id=?
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stored price after that persist: 19.90
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then a plain load + commit of that row -> 0 UPDATE
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load + commit of a row whose POJO has NO equals(), nothing touched -> 1 UPDATE
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sql> select l1_0.id,l1_0.specs from loose l1_0 where l1_0.id=?
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sql> update loose set specs=? where id=?
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same for Specs, which HAS equals() (Product row, nothing touched) -> 0 UPDATE
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== @DynamicUpdate: only the changed JSON column is written
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sql> update dyn set a=? where id=?
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