Mybatis框架-01：快速入门实例（快速搭建一个Mybatis工程）

第一步：创建工程

第二步：引入jar包

第三步：数据库建表

第四步：创建于数据库表对应的实体类

@Setter@Getter
public class Customer {
    private Integer cust_id;
    private String cust_name;
    private String cust_profession;
    private String cust_phone;
    private String email;

    @Override
    public String toString() {
        return "Customer{" +
                "cust_id=" + cust_id +
                ", cust_name='" + cust_name + '\'' +
                ", cust_profession='" + cust_profession + '\'' +
                ", cust_phone='" + cust_phone + '\'' +
                ", email='" + email + '\'' +
                '}';
    }
}

第五步：创建核心配置文件SqlMappingConfig.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>
    <!-- spring整合后 environments配置将废除 使用spring中的连接池 -->
    <environments default="development">
        <environment id="development">
            <!-- 使用jdbc事务管理 -->
            <transactionManager type="JDBC" />
            <!-- 数据库连接池 -->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver" />
                <property name="url"
                          value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8" />
                <property name="username" value="root" />
                <property name="password" value="123456" />
            </dataSource>
        </environment>
    </environments>


   
</configuration>

第六步：创建类的映射文件Customer.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">
<mapper namespace="myTest">
    <!--根据cust_id查询客户-->
    <select id="queryCustomerById" parameterType="Int" resultType="com.ctbu.domain.Customer">
	   SELECT * FROM `customer` WHERE cust_id  = #{cust_id}
	</select>
</mapper>

 

第七步：将创建的映射文件引入核心配置文件中

<!--加载映射文件-->
    <mappers>
        <mapper resource="com/ctbu/domain/Customer.xml"></mapper>
    </mappers>

第八步：编写测试类测试工程

public class TestOne {
    @Test
    public void test1() throws IOException {
        //创建SqlSessionFactoryBuilder对象
        SqlSessionFactoryBuilder factoryBuilder = new SqlSessionFactoryBuilder();
        //加载核心配置文件
        InputStream inputStream = Resources.getResourceAsStream("SqlMappingConfig.xml");
        //创建SqlSessionFactory对象
        SqlSessionFactory sqlSessionFactory = factoryBuilder.build(inputStream);
        //创建session对象
        SqlSession session = sqlSessionFactory.openSession();
        //执行sqlsession对象执行查询
        //第一个参数是customer.xml的statement的id
        //第二额参数是执行sql需要的参数
        Customer customer = session.selectOne("queryCustomerById", 1);

        System.out.println(customer);

        session.close();

    }
}