O/R Mapping(ORM)
ORM，即Object-Relationl Mapping，它的作用是在关系型数据库和对象之间作一个映射，这样，我们在具体的操作数据库的时候，就不需要再去和复杂的SQL语句打交道，只要像平 时操作对象一样操作它就可以了。
Hibernate(Java)
Hibernate is a powerful, high performance object/relational persistence and query service. Hibernate lets you develop persistent classes following object-oriented idiom - including association, inheri...
iBATIS(Java)
The iBATIS Data Mapper framework makes it easier to use a database with Java and .NET applications. iBATIS couples objects with stored procedures or SQL statements using a XML descriptor. Simplicity i...
Apache OJB (Java)
Apache ObJectRelationalBridge (OJB) is an Object/Relational mapping tool that allows transparent persistence for Java Objects against relational databases. OJB supports multiple persistence APIs t...