idea mybatis configures log4j to print an example of an sql statement

To configure log4j in IDEA, the steps are simple

1. Add the following configuration to Maven

<dependency>
   <groupId>commons-logging</groupId>
   <artifactId>commons-logging</artifactId>
   <version>1.2</version>
  </dependency>
  <dependency>
   <groupId>log4j</groupId>
   <artifactId>log4j</artifactId>
   <version>1.2.16</version>
  </dependency>

  <dependency>
   <groupId>org.slf4j</groupId>
   <artifactId>slf4j-api</artifactId>
   <version>1.5.6</version>
   <type>jar</type>
  </dependency>
  <dependency>
   <groupId>org.slf4j</groupId>
   <artifactId>slf4j-simple</artifactId>
   <version>1.5.6</version>
  </dependency>

2. Prepare mybatis-config.xml file

<?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>
 <settings>
  <!--  Print query statement  -->
  <setting name="logImpl" value="LOG4J" />
 </settings>
</configuration>

3. Preparation of log4j.properties

log4j.rootLogger=error, Console 
log4j.logger.com.wocus.wine.dao=debug 
#Console
log4j.appender.Console=org.apache.log4j.ConsoleAppender 
log4j.appender.Console.layout=org.apache.log4j.PatternLayout 
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n 

4. In the xml file scanned by mapper

 <!-- spring and MyBatis Perfect integration, no need mybatis The configuration mapping file for  -->
 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
  <property name="dataSource" ref="dataSource"/>
  <!--  Automatic scanning mapping.xml file  -->
  <property name="mapperLocations" value="classpath:com.wocus.wine/dao/*Mapper.xml"/>
  <!--  configuration log4j-->
  <property name="configLocation" value="classpath:mybatis-config.xml"></property>
 </bean>

Note: Log output in IDEA is in output. If you need to filter, shortcut Ctrl+F

【 extend 】

"Fine grained" control: Log4j prints out the configuration of only a single Mapper in MyBatis.

<!--  The following is by configuration log4j2 , just print out a single mapper the SQL Statement configuration -->
<logger name="com.beebank.dao.iface.UserMapper">
 <level>DEBUG</level>
</logger>