MyBatis-04-日誌(log4j+標準的日誌工廠)+分頁(Limit+RowBounds)

最近一直在寫項目，好久沒更新啦！！！

 

看完以下內容接着看：https://blog.csdn.net/lgz0921/article/details/104298254

目錄結構：其中log文件夾是log4j配置自動生成的。

 

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>mybatis-study</artifactId>
        <groupId>org.kuang</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>mybatis-04</artifactId>
    <!-- https://mvnrepository.com/artifact/log4j/log4j -->
    <dependencies>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
    </dependencies>

</project>

UserMapper.xml

<?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">
<!-- namespace 綁定一個Dao/Mapper接口  與接口名字一致-->
<mapper namespace="com.kuang.dao.UserMapper">
    <!--結果集映射-->
    <resultMap id="UserMap" type="User">
        <result column="pwd" property="password" />
    </resultMap>
    <select id="getUserById" resultMap="UserMap">
         select * from mybatis.user where id = #{id};
    </select>

    <!--分頁Limit-->
    <select id="getUserByLimit" resultMap="UserMap" parameterType="user">
         select * from mybatis.user limit #{startIndex},#{pageSize};
    </select>

    <!--分頁RowBounds-->
    <select id="getUserByRowBounds" resultMap="UserMap" parameterType="user">
         select * from mybatis.user;
    </select>
</mapper>

User:

package com.kuang.pojo;

public class User {
    private int id;
    private String name;
    private String password ;//類型名與字段名不一致

    public User() {
    }

    public User(int id, String name, String password) {
        this.id = id;
        this.name = name;
        this.password = password;
    }

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

MybatisUtils:

package com.kuang.utils;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

//SqlSessionFactory -> SqlSession
public class MybatisUtils {
    private static SqlSessionFactory sqlSessionFactory;
    static {
        try {
            //獲取使用Mybatis第一步SqlSessionFactory對象
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public static SqlSession getSqlSession(){
        return sqlSessionFactory.openSession();
    }
}

db.properties:

driver = com.mysql.cj.jdbc.Driver
url = jdbc:mysql://localhost:3306/mybatis?useSSL=true&usUnicode=true&characterEncoding=UTF-8&autoReconnect=true&failOverReadOnly=false&serverTimezone=UTC
username = root
password = lgz0921

log4j.properties:

#將等級爲DEBUG的日誌信息輸出到console和file這兩個目的地，console和file的定義在下面的代碼
log4j.rootLogger=DEBUG,console,file

#控制檯輸出的相關設置
log4j.appender.console = org.apache.log4j.ConsoleAppender
log4j.appender.console.Target = System.out
log4j.appender.console.Threshold=DEBUG
log4j.appender.console.layout = org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=[%c]-%m%n

#文件輸出的相關設置
log4j.appender.file = org.apache.log4j.RollingFileAppender
log4j.appender.file.File=./log/kuang.log
log4j.appender.file.MaxFileSize=10mb
log4j.appender.file.Threshold=DEBUG
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=[%p][%d{yy-MM-dd}][%c]%m%n

#日誌輸出級別
log4j.logger.org.mybatis=DEBUG
log4j.logger.java.sql=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

mybatis-config.xml

<?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 核心配置文件 -->
<configuration>

    <!--引入外部配置文件-->
    <properties resource="db.properties" />

    <settings>
        <!--標準的日誌工廠實現-->
    <!--<setting name="logImpl" value="STDOUT_LOGGING"/>-->
        <setting name="logImpl" value="LOG4J"/>
    </settings>

<!--可以給實體類起別名-->
    <typeAliases>
        <typeAlias type="com.kuang.pojo.User" alias="User"/>
    </typeAliases>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
    </environments>
    <!--每一個Mapper.xml都需要在Mybatis核心配置文件中註冊！-->
    <mappers>
<!--        <mapper resource="com/kuang/dao/UserMapper.xml"/>-->
          <mapper class="com.kuang.dao.UserMapper"/>
        <!-- <package name="com.kuang.dao"/> -->
    </mappers>
</configuration>

UserMapperTest:

package com.kuang.dao;

import com.kuang.pojo.User;
import com.kuang.utils.MybatisUtils;
import com.sun.javafx.collections.MappingChange;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.session.SqlSession;
import org.apache.log4j.Logger;
import org.junit.Test;

import java.util.HashMap;
import java.util.List;


public class UserMapperTest {
    static Logger logger = Logger.getLogger(UserMapperTest.class);
    @Test
    public void getUserById(){
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
        User user = userMapper.getUserById(1);
        System.out.println(user);
        sqlSession.close();
    }
    @Test
    public void testLog4j(){
        logger.info("info:進入了testLog4j");
        logger.debug("debug:進入了testLog4j");
        logger.error("error:進入了testLog4j");
    }
    @Test
    public void getUserByLimit(){
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        HashMap<String, Integer> map = new HashMap<String, Integer>();
        map.put("startIndex",2);
        map.put("pageSize",2);
        List<User> userlist = mapper.getUserByLimit(map);
        for (User user : userlist) {
            System.out.println(user);
        }
        sqlSession.close();
    }
    @Test
    public void getUserByRowBounds(){
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        RowBounds rowBounds = new RowBounds(1, 2);
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> userlist = sqlSession.selectList("com.kuang.dao.UserMapper.getUserByRowBounds",null, rowBounds);
        for (User user : userlist) {
            System.out.println(user);
        }
        sqlSession.close();
    }
}