What is Mybatis?
Mybatis is a semi-automated persistence framework.
Why Mybatis?
JDBC：
SQL entrained in Java code block, resulting in high coupling hardcoded
Not easy to maintain and the actual development needs in SQL change, circumstances change frequently in common
Hibernate and JPA:
Long difficult complex SQL, for a Hibernate process is not easy
Internal automatically generated SQL, not easy to do special optimization
Automatic mapping based on the whole frame, the number of fields compared POJOs suffering partial map, resulting in decreased performance database
The actual development, for developers, the core still need their own SQL optimization, and Mybatis SQL and Java code in separate, clear boundary function, a focus on business, a focus on data