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1. How many steps does JDBC have?
JDBC can be divided into six steps
2. What is mybatis?
If you are asked in the interview, just say the following three things:
——From the official website. I recommend that you answer according to the official.
Mybatis interview questions and answers
Ibatis: In 2010, the Apache Ibatis framework stopped updating and was handed over to the google team. At the same time, it was renamed MyBatis. Ibatis has not been updated since 2010 and has completely become an orphan frame. An unmaintained frame is destined to be photographed on the beach by mybatis.
Mybatis: An upgraded version of Ibatis.
Mybatis realizes the binding of the DAO interface and the xml mapping file, and automatically generates the specific implementation of the interface for us, which becomes more trouble-free and convenient to use.
Annotation usage: when the SQL statement is simple
xml binding usage: xml binding (@RequestMap is used to bind xml files)
Map key-value pairs
column: the column name of the table in the database
property: the name of the property in the entity bean
Separate the Sql statement from Java.
It encapsulates the calls of the underlying JDBC and API, and can automatically convert the result set into a JavaBean object, which simplifies the repetitive work of Java database programming.
Write Sql statements yourself, which is more flexible.
No need to use object encapsulation (or map encapsulation) to enter parameters, use @Param annotation
property: property name
column: common column
ofType: the type of elements in the collection
select: the query to be connected
property: property name
select: the query to be connected
column: common column
javaType: the type of elements in the collection
RowBounds object pagination
Write directly in Sql, with physical paging
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