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方式一:指定mybatis日志级别

# application.yml
mybatis:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
 
# 等价于application.properties
mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl

方式二、Mybatis-Plus配置(如果用了 Mybatis-Plus )

# 开启mybatis-plus自带SQL打印
mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl

方式三、mybatis-config.xml 配置(一般是在配置文件中指定了读取 mybatis-config 才这样写)

 <configuration>
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>
</configuration>