mybatis框架-01

mybatis

• 在idea中新建一个maven空项目名为Mybatis
• 在这个空项目下新建一个module名为mybatis-01,以及新建以下的文件
  

在Mybatis的pom.xml中导入依赖文件以便所有的module都可以使用

<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>4.0.0modelVersion>

    <groupId>com.hugroupId>
    <artifactId>MybatisartifactId>
    <packaging>pompackaging>
    <version>1.0-SNAPSHOTversion>
    <modules>
        <module>mbatis-01module>
    modules>

    <dependencies>
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <version>5.1.49version>
        dependency>
        <dependency>
            <groupId>org.mybatisgroupId>
            <artifactId>mybatisartifactId>
            <version>3.5.5version>
        dependency>
        <dependency>
            <groupId>junitgroupId>
            <artifactId>junitartifactId>
            <version>4.12version>
            <scope>testscope>
        dependency>
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <version>1.18.12version>
        dependency>

    dependencies>


    <build>
        <resources>
            <resource>
                <directory>src/main/resourcesdirectory>
                <includes>
                    <include>**/*.propertiesinclude>
                    <include>**/*.xmlinclude>
                includes>
                <filtering>truefiltering>
            resource>
            <resource>
                <directory>src/main/javadirectory>
                <includes>
                    <include>**/*.propertiesinclude>
                    <include>**/*.xmlinclude>
                includes>
                <filtering>truefiltering>
            resource>
        resources>
    build>

project>

• 新建一个User类

package com.hu.pojo;


import lombok.*;

@AllArgsConstructor
@NoArgsConstructor
@Setter
@Getter
@ToString
public class User {
     
    private Integer id;
    private String username;
    private String password;

}

• 新建一个UserMapper接口(用于操作数据库)

package com.hu.mapper;

import com.hu.pojo.User;

import java.util.List;

public interface UserMapper {
     
     List<User> getUserList();
}

• 在该类的同包下新建一个UserMapper.xml用于对User类进行CRUD的配置

<mapper namespace="com.hu.mapper.UserMapper">
    <select id="getUserList" resultType="com.hu.pojo.User">
        select  * from mybatis.user
    select>
mapper>

• 新建一个MybatisUtils类作为工具类获取SqlSession对象

package com.hu.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;

public class MybatisUtils {
     

    private static InputStream resourceAsStream = null;
    private static SqlSessionFactory build = null;

    static {
     
        try {
     
            resourceAsStream = Resources.getResourceAsStream("mybatis-config.xml");
            build = new SqlSessionFactoryBuilder().build(resourceAsStream);
        } catch (IOException e) {
     
            e.printStackTrace();
        }
    }

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

}

• 在test包下新建一个test类进行测试

package com.hu.mapper;
import com.hu.pojo.User;
import com.hu.utils.MybatisUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import java.util.List;

public class UserMapperTest {
     

    @Test
    public void test1(){
     
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> list = mapper.getUserList();
        for (User user : list) {
     
            System.out.println(user);
        }
    }

}