Shulou(Shulou.com)05/31 Report--

This article mainly explains the "characteristics and functions of MyBatis". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "the characteristics and functions of MyBatis".

What are the MyBatis characteristics?

1. Lightweight itself does not rely on any other JAR, but needs to provide a JDBC implementation

two。 Flexible and more suitable for Internet applications with frequently changing requirements

3. The cost of learning is low, and it is easy to master the use of MyBatis compared to the ORM framework.

What is the position of MyBatis in the structure?

MyBatis is in the position of DAO (data access object). Review the job responsibilities of DAO:

Connect to the database

Receive input data

Splice and execute SQL

Parse and return the result

What can MyBatis do?

There are the following problems with using JDBC to complete the DAO layer

Each operation requires manual creation of the connection, and finally closes the connection

Developers usually encapsulate duplicate code, but there is no fixed pattern for encapsulated code due to everyone's different coding styles.

MyBatis puts the parameters related to the database connection into the configuration XML and encapsulates the code to create the connection

Frequent creation and destruction of connections

Because the database connection uses TCP persistent connection, in the system with large concurrency, this way will lead to the depletion of database connection resources.

MyBatis itself implements connection pooling, which can solve this problem. Of course, other better connection pooling will be replaced later.

Accept parameters to splice SQL statements and execute

Each SQL statement is written directly in the code (hard-coded). If the requirements change later, you need to modify the SQL in the source code, and then recompile and test.

MyBatis strips the SQL statement from the code into the Mapper.xml mapping file

Analytical results

JDBC returns ResultSet, which must be manually mapped to one object after another, which is also highly repetitive code; and there are hard coding problems

MyBatis implements mapping of input parameters to SQL parameters and mapping of result sets to POJO objects.

Thank you for your reading, the above is the content of "the characteristics and functions of MyBatis". After the study of this article, I believe you have a deeper understanding of the characteristics and functions of MyBatis, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.