MyBatis01-maven依赖以及运行

快速搭建一个MyBatis环境以及运行第一个MyBatis程序

1：创建一个Maven项目

打包方式为jar包，引入相关依赖（mybatis，musql驱动，单元测试）

pom.xml

<!--打包方式jar-->
  <packaging>jar</packaging>


  <dependencies>
      <dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
          <version>5.1.37</version>
      </dependency>

      <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis</artifactId>
          <version>3.5.7</version>
      </dependency>

      <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.12</version>
          <scope>test</scope>
      </dependency>

  </dependencies>

2：创建数据库表和实体类

t_user：
User类：

public class User {
    private Integer id;
    private String username;
    private String password;
    private Integer age;
    private String sex;
    private String email;

    public User(){

    }

    public User(Integer id, String username, String password, Integer age, String sex, String email) {
        this.id = id;
        this.username = username;
        this.password = password;
        this.age = age;
        this.sex = sex;
        this.email = email;
    }

    public Integer getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

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

    public Integer getAge() {
        return age;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getEmail() {
        return email;
    }

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

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

3：根据官方文档配置MyBatis的全局配置文件

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>
    <!--配置连接数据的环境-->
    <environments default="development">
        <!--具体环境-->
        <environment id="development">
            <!--事务管理类型是JDBC来管理,需要通过sqlSession提交事务 -->
            <transactionManager type="JDBC"/>
            <!--数据源-->
            <dataSource type="POOLED"><!--POOLED 数据库连接池-->
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis"/>
                <property name="username" value="root"/>
                <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>
    <!--引入映射文件-->
    <mappers>
        <mapper resource="mappers/UserMapper.xml"/>
    </mappers>
</configuration>

4：创建Mapper接口以及Mapper映射文件

Mapper接口：

public interface UserMapper {

    /*
    表->实体类->mapper接口->mapper映射文件
    MyBatis：
    1：映射文件的nameSpace和Mapper接口全类名一致
    <mapper namespace="MapperInterface.UserMapper"></mapper>
    2：映射文件的sql语句ID和方法名一致
      <insert id="insertUser"></insert>
    3：
     */


    //添加用户
        int insertUser();

}

Mapper映射文件：

<?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">
<!--名称空间-->
<mapper namespace="MapperInterface.UserMapper">


    <!--int insertUser();-->
    <insert id="insertUser">
        insert into t_user values(null,'admin','123456','23','男','123456@qq.com')
    </insert>


</mapper>

5：单元测试

testMyBatis：

@Test
public void name() throws IOException {
    //1:加载核心配置文件
    InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
    //2:获取SqlSessionFactoryBuilder对象
    SqlSessionFactoryBuilder sqlSessionFactoryBuilder=new SqlSessionFactoryBuilder();
    //3:获取SqlSessionFactory
    SqlSessionFactory sqlSessionFactory=sqlSessionFactoryBuilder.build(inputStream);
    //4:获取sqlSession
    SqlSession sqlSession = sqlSessionFactory.openSession();
    //5:获取mapper对象
    UserMapper mapper = sqlSession.getMapper(UserMapper.class);//底层是代理模式，返回接口的实现类对象
    //6:提交事务
    mapper.insertUser();
    sqlSession.commit();
}

6：测试结果和结构目录