Mybatis environment configuration (environments)

Environment

Transaction Manager (transactionManager)

Data Source (dataSource)

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Environment

Look directly at the official website Mybatis official website

The official website is also nonsense: But remember: Although you can configure multiple environments, each SqlSessionFactory instance can only choose one environment.

Our connection example:

 

<?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/study?userSSL=true&amp;useUnicode=true&amp;characterEncoding=utf-8&amp;serverTimezone=Asia/Shanghai"/>
                <property name="username" value="root"/>
                <property name="password" value="password"/>
            </dataSource>
        </environment>
        <environment id="test">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
    </environments>
</configuration>

 

Transaction Manager (transactionManager)

Generally use JDBC , rarely use MANAGED 

Data Source (dataSource)

• UNPOOLED: No connection pool
• POOLED: connection pool
• JNDI: Normal connection

The default is POOLED, also use POOLED