一、列印sql到控制檯

1、配置log4j.properties

log4j.rootLogger=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

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

2、在mybatis-config.xml中新增如下語句

<settings>
        <!-- 列印查詢語句 -->
        <setting name="logImpl" value="LOG4J"/>
</settings>

注意以上語句必須要放到typeAliases之前

3、如果根據如上配置還不能列印sql，且報“logImpl is unknown”，則將mybatis的jar包更換成mybatis-3.2.3.jar

4、相關jar包如下

二、列印sql到日誌檔案

1、配置log4j.properties

log4j.rootLogger=DEBUG
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

2、配置log4j.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
    <appender name="appender" class="org.apache.log4j.DailyRollingFileAppender">
        <param name="File" value="E:/logs/log4j.log" />
        <param name="Append" value="true" />
        <param name="threshold" value="DEBUG" />
        <param name="DatePattern" value="'.'yyyy-MM-dd'.txt'" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d [%t] %-5p [%c] - %m%n" />
        </layout>
    </appender>
    
    <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>
        <priority value="debug" />
        <appender-ref ref="appender" />
    </root>
</log4j:configuration>