MyBatis整合Log4j

女爷i 2022-12-01 14:02 125阅读 0赞

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>
        
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.4</version>
        </dependency>
            <dependency>
                
                <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： ###

![20200827111558824.png][]

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  \u65e5\u5fd7\u5728\u63a7\u5236\u8f93\u51fa\u914d\u7f6e
    ######################################################################################
    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  \u6bcf\u5929\u4ea7\u751f\u4e00\u4e2a\u65e5\u5fd7\u6587\u4ef6\uff0c\u6587\u4ef6\u540d\u683c\u5f0f: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&characterEncoding=UTF-8&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：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMwNjMxMDYz_size_16_color_FFFFFF_t_70][]

[20200827111558824.png]: /images/20221123/f0132cdbe97248b6a3a78c8b602956ab.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMwNjMxMDYz_size_16_color_FFFFFF_t_70]: /images/20221123/8b11b1a53a0840dcafb34e7616ccaf0a.png