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A tentative study of Hibernate curriculum single-table mapping 1-2 ORM Definition

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1 What is ORM?

ORM (object/relationship Mapping) object/Relationship Mapping

Object-oriented programming (OOP) ultimately holds object information in a relational database and writes many SQL statements. This is incompatible with the idea of object-oriented programming.

2 Write a lot of flaws in SQL

A different database syntax, such as PL/SQL and T/SQL (SQL for Oracle vs. Microsoft)

b The same functionality has different implementations in different databases (paging: Oracle rowno,mysql limit,sqlserver top)

C program relies too much on SQL, later maintenance is inconvenient

A tentative study of Hibernate curriculum single-table mapping 1-2 ORM Definition

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