log4j配置打印mybatis sql语句

log4j.rootLogger=DEBUG, stdout

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[service] %d - %c -%-4r [%t] %-5p %c %x - %m%n

#log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
#log4j.appender.R.File=../logs/service.log
#log4j.appender.R.layout=org.apache.log4j.PatternLayout
#log4j.appender.R.layout.ConversionPattern=[service] %d - %c -%-4r [%t] %-5p %c %x - %m%n

#log4j.logger.com.ibatis = debug
#log4j.logger.com.ibatis.common.jdbc.SimpleDataSource = debug
#log4j.logger.com.ibatis.common.jdbc.ScriptRunner = debug
#log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate = debug
#log4j.logger.java.sql.Connection = debug
log4j.logger.java.sql.Statement = debug
log4j.logger.java.sql.PreparedStatement = debug
log4j.logger.java.sql.ResultSet =debug

在开发的过程中为了能够显示sql语句以此来跟踪mybatis的的操作，虽然网络上的配置都是轻轻的一句话概括之，但是按照他们的方法一一试之，都是毫无效果，各种煎熬相比遇到相似问题的同仁应该有此感受。为了让大家能够少走弯路，现将自己的心得分享给大家。欢迎交流

我们现在分几种情况处理：

 1、此种情况只出现mybatis使用，无其他的包介入（如spring等，因为有些包会引入其他的日志系统，会造成干扰，稍后讲解）

<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>

<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.21</version>
</dependency>

<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.21</version>
</dependency>

1、单独开放第三个无法打印sql语句
2、第一种和第三种无法打印sql语句
3、其他情况都可以打印出sql语句
4、最后得出的结论可能是版本冲突的问题

总而言之
1、没有slf4j，只要log4j即可
2、有slf4j，则必须要有slf4j-log4j12，其他的可有可无

此时可以配置log4j.properties和log4j.xml均可以实现

如：log4j.properties

log4j.rootLogger=DEBUG, stdout

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[service] %d - %c -%-4r [%t] %-5p %c %x - %m%n

#log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
#log4j.appender.R.File=../logs/service.log
#log4j.appender.R.layout=org.apache.log4j.PatternLayout
#log4j.appender.R.layout.ConversionPattern=[service] %d - %c -%-4r [%t] %-5p %c %x - %m%n

#log4j.logger.com.ibatis = debug
#log4j.logger.com.ibatis.common.jdbc.SimpleDataSource = debug
#log4j.logger.com.ibatis.common.jdbc.ScriptRunner = debug
#log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate = debug
#log4j.logger.java.sql.Connection = debug
log4j.logger.java.sql.Statement = debug
log4j.logger.java.sql.PreparedStatement = debug
log4j.logger.java.sql.ResultSet =debug

2、mybatis和其他架构包混用，

最头痛的就是这种，试了很多种办法，最后才校验出一种合适的办法。就是一定要用log4j.xml配置

配置如下：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"
debug="false">

<appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="[%d{dd/MM/yy hh:mm:ss:sss z}] %5p %c{2}: %m%n" />
</layout>
</appender>

<!-- 	<appender name="FILE" class="org.apache.log4j.RollingFileAppender"> -->
<!-- 		<param name="file" value="${user.home}/foss-framework.log" /> -->
<!-- 		<param name="append" value="true" /> -->
<!-- 		<param name="maxFileSize" value="10MB" /> -->
<!-- 		<param name="maxBackupIndex" value="100" /> -->
<!-- 		<layout class="org.apache.log4j.PatternLayout"> -->
<!-- 			<param name="ConversionPattern" value="%d [%t] %-5p %C{6} (%F:%L) - %m%n" /> -->
<!-- 		</layout> -->
<!-- 	</appender> -->

<!-- 	<appender name="framework" -->
<!-- 		class="com.deppon.foss.framework.server.components.logger.BufferedAppender"> -->
<!-- 		<layout class="org.apache.log4j.PatternLayout"> -->
<!-- 			<param name="ConversionPattern" value="[%d{dd/MM/yy hh:mm:ss:sss z}] %5p %c{2}: %m%n" /> -->
<!-- 		</layout> -->
<!-- 	</appender> -->

<!-- 下面是打印 mybatis语句的配置 -->
<logger name="com.ibatis" additivity="true">
<level value="DEBUG" />
</logger>

<logger name="java.sql.Connection" additivity="true">
<level value="DEBUG" />
</logger>

<logger name="java.sql.Statement" additivity="true">
<level value="DEBUG" />
</logger>

<logger name="java.sql.PreparedStatement" additivity="true">
<level value="DEBUG" />
</logger>

<logger name="java.sql.ResultSet" additivity="true">
<level value="DEBUG" />
</logger>

<root>
<level value="DEBUG" />
<appender-ref ref="CONSOLE" />
<!-- 		<appender-ref ref="FILE" /> -->
<!-- 		<appender-ref ref="framework" /> -->
</root>
</log4j:configuration>

好的能够打印出sql语句啦，成功啦！

[24/07/16 03:49:25:025 CST] DEBUG spring.SqlSessionUtils: Creating a new SqlSession
[24/07/16 03:49:25:025 CST] DEBUG spring.SqlSessionUtils: SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@5a90d465] was not registered for synchronization because synchronization is not active
[24/07/16 03:49:25:025 CST] DEBUG datasource.DataSourceUtils: Fetching JDBC Connection from DataSource
[24/07/16 03:49:25:025 CST] DEBUG datasource.DriverManagerDataSource: Creating new JDBC DriverManager Connection to [jdbc:mysql://localhost:3307/security_db?useUnicode=true&characterEncoding=utf-8]
[24/07/16 03:49:25:025 CST] DEBUG transaction.SpringManagedTransaction: JDBC Connection [com.mysql.jdbc.JDBC4Connection@51e19e59] will not be managed by Spring
[24/07/16 03:49:25:025 CST] DEBUG UserMapper.getUserNum: ==>  Preparing: select COUNT(DISTINCT(user.id)) as total_num from user, user_roles where user.id = user_roles.User_id
[24/07/16 03:49:25:025 CST] DEBUG UserMapper.getUserNum: ==> Parameters:
[24/07/16 03:49:25:025 CST] DEBUG UserMapper.getUserNum: <==      Total: 1

补充：有兴趣的同学可以试验下

自定义MyBatis 日志

MyBatis使用其内部LoggerFactory作为真正的日志类库使用的门面。其内部的LaggerFactory会将日志记录任务委托给如下的所示某一个日志实现，日志记录优先级由上到下顺序递减：
l  SLF4J
l  ApacheCommons Logging
l  Log4j2
l  Log4j
l  JDKlogging

如果MyBatis未发现上述日志记录实现，则MyBatis的日志记录功能无效。

如果你的运行环境中，在classpath中有多个可用的日志类库，并且你希望MyBaits使用某个特定的日志实现，你可以通过调用以下其中一个方法：
žorg.apache.ibatis.logging.LogFactory.useSlf4jLogging();
ž  org.apache.ibatis.logging.LogFactory.useLog4JLogging();
ž  org.apache.ibatis.logging.LogFactory.useLog4J2Logging();
ž  org.apache.ibatis.logging.LogFactory.useJdkLogging();
ž  org.apache.ibatis.logging.LogFactory.useCommonsLogging();
ž  org.apache.ibatis.logging.LogFactory.useStdOutLogging();