How to set up the connection pool for MyBatis?

In order to set up the connection pool for MyBatis, you need to add data source configuration in the MyBatis configuration file (usually mybatis-config.xml). Here is an example configuration:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
    PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mydatabase"/>
                <property name="username" value="username"/>
                <property name="password" value="password"/>
            </dataSource>
        </environment>
    </environments>
</configuration>

In the configuration above, the element specifies the type of connection pool as POOLED, and also sets the connection information such as database driver, database URL, username, and password.

In addition, the connection pool behavior can also be configured through some properties such as maximum active connections, maximum idle connections, connection timeout, etc. Specific property configurations can be found in the official documentation of MyBatis.

Once the setup is completed, place the configuration file in the MyBatis configuration path and specify this file when using MyBatis to enable the connection pool.