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This article will explain in detail the example analysis of the SSM framework Mybatis. The content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

Mybatis

Mybatis has two configuration files: mapping file (mapper.xml) and main configuration file (mybatis.xml)

Mapping file:

Connect the class to the database, write sql statements to complete the mapping

Insert into student (name,age,score) values (# {name}, # {age}, # {score})

Master profile:

Configure transaction management:

Data source (connecting to database): and age > # {age}

Where tag splicing replaces if

Select id,name,age,score from student and name like "# {name}"and age > # {age}"

(3) Association relation query

The query involves multiple tables

Delayed loading

(4) query cache

Improve query efficiency by not querying the results from the database every time

(5) annotated development

Replace the mapping file mapper.xml

@ Insert (value = {"insert into student (name,age,score) values (# {name}, # {age}, # {score})"}) void insertStudent (Student student); summary:

Register the mapping file through the Mapper interface (bulk load)

The Mapper interface must have the same name as the Mapper.xml file and be in the same package, that is, the namespace in the Mapper.xml file is the full class name of the Mapper interface.

The method name in the Mapper interface is the same as the id defined in the Mapper.xml file

The input parameter type of Mapper API should be the same as the parameterType defined in Mapper.xml.

The data type returned by the Mapper API should be the same as the resultType defined in Mapper.xml.

Mapper.xml

MyBatis.xml

This is the end of the sample analysis of the SSM framework Mybatis. I hope the above content can be of some help and learn more knowledge. If you think the article is good, you can share it for more people to see.

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