MyBatis整合Log4j

今天就来说一下我们如何在窗口中看到我们执行了sql语句，使用Log4j工具

第一步：首先我们创建一个Maven项目：

导入必须的依赖：

<dependencies>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.20</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.4</version>
    </dependency>
        <dependency>
            <!-- 单元测试 -->
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
<dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
//如果是web项目，要引入这个依赖
<dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-web</artifactId>
            <version>2.13.3</version>
        </dependency>
</dependencis>

第二步：在resource文件下创建log4j配置文件和mybatis配置文件：

log4j.properties：

log4j.rootLogger=DEBUG,CONSOLE,file
#log4j.rootLogger=ERROR,ROLLING_FILE
log4j.logger.cn.siliang.dao=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 
log4j.logger.java.sql.ResultSet=debug 
log4j.logger.org.tuckey.web.filters.urlrewrite.UrlRewriteFilter=debug

######################################################################################
# Console Appender  u65e5u5fd7u5728u63a7u5236u8f93u51fau914du7f6e
######################################################################################
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.Threshold=error
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern= [%p] %d %c - %m%n


######################################################################################
# DailyRolling File  u6bcfu5929u4ea7u751fu4e00u4e2au65e5u5fd7u6587u4ef6uff0cu6587u4ef6u540du683cu5f0f:log2009-09-11
######################################################################################
log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.DatePattern=yyyy-MM-dd
log4j.appender.file.File=log.log
log4j.appender.file.Append=true
log4j.appender.file.Threshold=error
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-M-d HH:mm:ss}%x[%5p](%F:%L)%m%n


log4j.logger.com.opensymphony.xwork2=error 

 mybatis-config.xml文件配置：

<?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>

        <setting name="logImpl" value="LOG4J"/>
        <setting name="autoMappingBehavior" value="FULL"/>

    </settings>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;characterEncoding=UTF-8&amp;serverTimezone=UTC"/>
                <property name="username" value="root"/>
                <property name="password" value="123"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="dao/UserMapper.xml"/>
    </mappers>
</configuration>

第三步：我们开始写实体 和 接口以及单元测试类

User实体：

package pojo;


import java.sql.DatabaseMetaData;
import java.sql.Date;

public class User {
    private String id;  //id
    private String name;   //姓名
    private int age;   //密码
    private String email;
    private Date create_time;
    private Date update_time;
    private int version;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public Date getCreate_time() {
        return create_time;
    }

    public void setCreate_time(Date create_time) {
        this.create_time = create_time;
    }

    public Date getUpdate_time() {
        return update_time;
    }

    public void setUpdate_time(Date update_time) {
        this.update_time = update_time;
    }

    public int getVersion() {
        return version;
    }

    public void setVersion(int version) {
        this.version = version;
    }

    @Override
    public String toString() {
        return "User{" +
                "id='" + id + ''' +
                ", name='" + name + ''' +
                ", age=" + age +
                ", email='" + email + ''' +
                ", create_time=" + create_time +
                ", update_time=" + update_time +
                ", version=" + version +
                '}';
    }
}

UserMapper接口：

package dao;
import pojo.User;
import java.util.List;
public interface UserMapper {
    List<User> selectUser();
}

UserMapper.xml文件：

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="dao.UserMapper">
    <select id="selectUser" resultType="pojo.User">
  select * from user
 </select>

</mapper>

添加一个myBatis的工具类：

public class MybatisUtils {

    private static SqlSessionFactory sqlSessionFactory;

    static {
        try {
            //使用mybatis获取sqlSessionFactory对象
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
             sqlSessionFactory =
                    new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //既然有了SqlSessionFactory，顾名思义，我们就可以从中获得SqlSession的失礼了
    //SqlSession完全包含了面向数据库执行SQL命令所需的所有方法
    public static SqlSession getSqlSession() {
        return sqlSessionFactory.openSession();
    }
}

单元测试：

public class UserTest {
    @Test
    public void test1(){
//        第一步：获得sqlsession对象
        SqlSession sqlSession= MybatisUtils.getSqlSession();
//        方式一： 执行 sql
        UserMapper userDao=sqlSession.getMapper(UserMapper.class);
        List<User> userList=userDao.selectUser();
        for(User user:userList){
            System.out.println(user);
        }
        //关闭sqlSession
        sqlSession.close();
    }
}

最终大功告成！ 运行结束之后我们可以看看日志：

最后

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