​Mybatis 各个文件的配置

<?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核心配置文件-->
<configuration>
    <!--导入外部资源路径 -->
    <properties resource="db.properties"/>
    <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>
    <mappers>
        <mapper resource="databases/AdministratorMapper.xml" />
        <mapper resource="databases/CarMessagesMapper.xml" />
        <mapper resource="databases/InOutMapper.xml" />
        <mapper resource="databases/ParkMessagesMapper.xml" />
    </mappers>
</configuration>]

<?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">
    <modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
    <artifactId>MybatisStudy</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>mybatis01</module>
    </modules>
<dependencies>
        <!--mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <!--junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
</dependencies>
</project>

package mybatis.utils;
import java.io.IOException;
import java.io.InputStream;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
/**
 * description:  <br>
 * date: 2021/4/26 20:59 <br>
 * author: ztz <br>
 * version: 1.0 <br>
 */
public class MybatisUtils {<!-- -->
    private static SqlSessionFactory sqlSessionFactory;
    static {<!-- -->
        //使用mybatis第一步，获取sqlSessionFactory对象
        String resources = "mybatis-config.xml";
        try {<!-- -->
            InputStream inputStream = Resources.getResourceAsStream(resources);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {<!-- -->
            e.printStackTrace();
        }
    }
    //既然有了sqlSessionFactory，顾名思义，我们就可以从中获取SqlSession的实例
    //SqlSession 完全包含了面向数据库执行sql的所有方法
    public static SqlSession getSqlSession(){<!-- -->
        return sqlSessionFactory.openSession();
    }
}

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatisuseSSL=true&useUnicode=true&characterEncoding=UTF-8
// 你的用户名
username=root
// 你的密码
password=123456

<?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="com.tansty.dao.UserMapper">
    <select id="getUserList" resultType="com.tansty.pojo.User">
        select * from mybatis.user
    </select>
    <select id="getUserList2" resultType="com.tansty.pojo.User" >
        select * from mybatis.user where user like #{value}
    </select>
<insert id="insertUser" parameterType="com.tansty.pojo.User" >
        insert into mybatis.user(id,user,pwd) values(#{id},#{user},#{pwd})
    </insert>
<insert id="insertUser2" parameterType="map" >
        insert into mybatis.user(id,user,pwd) values(#{id},#{userName},#{password})
    </insert>
<delete id="deleteUser" parameterType="int" >
        delete from mybatis.user where id=#{id}
    </delete>
<update id="updateUser" parameterType="com.tansty.pojo.User">
        update mybatis.user set user = #{user},pwd=#{pwd} where id=#{id} ;
    </update>
</mapper>

 <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
            </resource>
        </resources>
    </build>