log4j2打印Mybatis执行的SQL语句及SQL语句的执行时间

有关于log4j2的详细配置方式，建议大家观看log4j2配置文件详解，这里不做介绍

一、首先如需使用log4j2，得引入maven依赖

 

		
            org.apache.logging.log4j
            log4j-api
            ${log4j2.version}
        
        
            org.apache.logging.log4j
            log4j-core
            ${log4j2.version}
        
		
             org.apache.logging.log4j
             log4j-web
             ${log4j2.version}
        

注：本人使用的是2.7版本的log4j2

 

二、然后在项目的classpath下编写log4j2.xml

log4j2在启动的时候会默认加载名为log4j2.xml的配置文件

 

  
  
    
        
      	
          D:/log4j2/mybatis/genertor/logs/
          error
        
        
      	
            
                
            
    	
            
                
                
              	  
                    
                  
                    
              
                
                
            
          
        
    
        
            
            
            
            
            
            
            
            
            
            
            
          
          
                
                
            
            
        
          
          
        
          
              
                
            
        
    

 

三、在web.xml中配置log4j2的加载启动

 

 

     
        org.apache.logging.log4j.web.Log4jServletContextListener
     
     
         log4jServletFilter
        org.apache.logging.log4j.web.Log4jServletFilter
     
     
         log4jServletFilter
         /*
        REQUEST
         FORWARD
         INCLUDE
         ERROR
     
     

注：加上上述配置后，就能在项目启动是加载log4j2

 

四、在Mybatis的配置文件中，加入上述配置

注：settings配置完毕后，即可实现SQL语句的打印！控制台打印如下结果：

2017-10-23 16:38:01,021 DEBUG (BaseJdbcLogger.java:145) - ==>  Preparing: SELECT count(*) FROM t_user 
2017-10-23 16:38:01,056 DEBUG (BaseJdbcLogger.java:145) - ==> Parameters: 
2017-10-23 16:38:01,084 DEBUG (BaseJdbcLogger.java:145) - <==      Total: 1

五、实现Mybatis官方提供的拦截器，用于记录SQL语句的执行时间

package com.stu.interceptor;

import java.sql.Statement;
import java.util.Properties;

import org.apache.ibatis.executor.statement.StatementHandler;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.session.ResultHandler;

/**
 * Sql执行时间记录拦截器 
 */
@Intercepts({@Signature(type = StatementHandler.class, method = "query", args = {Statement.class, ResultHandler.class}),
 @Signature(type = StatementHandler.class, method = "update", args = {Statement.class}),
 @Signature(type = StatementHandler.class, method = "batch", args = { Statement.class })})
public class SqlCostInterceptor implements Interceptor {
 
 @Override
 public Object intercept(Invocation invocation) throws Throwable {
   
  long startTime = System.currentTimeMillis();
  try {
   return invocation.proceed();
  } finally {
   long endTime = System.currentTimeMillis();
   long sqlCost = endTime - startTime;
   System.out.println("执行耗时 : [" + sqlCost + "ms ] ");
  }
 }
 
 @Override
 public Object plugin(Object target) {
  return Plugin.wrap(target, this);
 }
 
 @Override
 public void setProperties(Properties properties) {
   
 }
  
}

注：Interceptor接口是Mybatis官方提供的拦截接口，创建一个类实现该接口并重写其三个方法并将该类配置在Mybatis的配置文件中，即可拦截SQL语句的执行过程

六、将手动编写的拦截器配置在Mybatis配置文件中：

七、测试SQL的控制台打印结果

2017-10-23 16:38:01,091 DEBUG (BaseJdbcLogger.java:145) - ==>  Preparing: select id, username, password, state, isdel, add_time, money, left_money from t_user limit ?,? 
2017-10-23 16:38:01,093 DEBUG (BaseJdbcLogger.java:145) - ==> Parameters: 0(Integer), 15(Integer)
2017-10-23 16:38:01,128 DEBUG (BaseJdbcLogger.java:145) - <==      Total: 15
执行耗时 : [36ms ] 

 

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