快速学习-MyBatis入门

myBatis-3.4.1.jar
mysql-connector-java-5.1.37-bin.jar
log4j.jar

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
 
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
 
 <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
   <param name="Encoding" value="UTF-8" />
   <layout class="org.apache.log4j.PatternLayout">
    <param name="ConversionPattern" value="%-5p %d{MM-dd HH:mm:ss,SSS} %m  (%F:%L) \n" />
   </layout>
 </appender>
 <logger name="java.sql">
   <level value="debug" />
    </logger>
 <logger name="org.apache.ibatis">
   <level value="info" />
 </logger>
 <root>
   <level value="debug" />
   <appender-ref ref="STDOUT" />
 </root>
</log4j:configuration>

-- 创建库
CREATE DATABASE test_mybatis;
-- 使用库
USE test_mybatis;
-- 创建表
CREATE TABLE tbl_employee(
   id INT(11) PRIMARY KEY AUTO_INCREMENT,
   last_name VARCHAR(50),
   email VARCHAR(50),
   gender CHAR(1)
);

public class Employee {

	private Integer id ; 
	private String lastName; 
	private String email ;
	private String gender ;
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getLastName() {
		return lastName;
	}
	public void setLastName(String lastName) {
		this.lastName = lastName;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public String getGender() {
		return gender;
	}
	public void setGender(String gender) {
		this.gender = gender;
	}
	@Override
	public String toString() {
		return "Employee [id=" + id + ", lastName=" + lastName + ", email=" + email + ", gender=" + gender + "]";
	}

<?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>
	<!-- 数据库连接环境的配置 -->
	<environments default="development">
		<environment id="development">
			<transactionManager type="JDBC" />
			
			<dataSource type="POOLED">
				<property name="driver" value="com.mysql.jdbc.Driver" />
				<property name="url" value="jdbc:mysql://localhost:3306/mybatis_1129" />
				<property name="username" value="root" />
				<property name="password" value="1234" />
			</dataSource>
		</environment>
	</environments>
	<!-- 引入SQL映射文件,Mapper映射文件 	-->
	<mappers>
		<mapper resource="EmployeeMapper.xml" />
	</mappers>
</configuration>

<?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="suibian">
	<select id="selectEmployee" resultType="com.atguigu.myabtis.helloWorld.Employee">
		select id ,last_name lastName ,email ,gender from tbl_employee where id = #{id}
		<!-- select * from tbl_employee  where id = #{id} -->
	</select>
</mapper>

	@Test
	public void test() throws Exception {
		String resource = "mybatis-config.xml";
		InputStream inputStream = Resources.getResourceAsStream(resource);
		SqlSessionFactory sqlSessionFactory = 
					new SqlSessionFactoryBuilder().build(inputStream);
		System.out.println(sqlSessionFactory);
		
		SqlSession session  = sqlSessionFactory.openSession();
		try {
			Employee employee = 
					session.selectOne("suibian.selectEmployee", 1001);
			System.out.println(employee);
		} finally {
			session.close();
		}
	}

public interface EmployeeMapper {
	
	public Employee getEmployeeById(Integer id );	
	
}

	@Test
	public void test()  throws Exception{
		String resource = "mybatis-config.xml";
		InputStream inputStream =
                 Resources.getResourceAsStream(resource);
		SqlSessionFactory sqlSessionFactory = 
				new SqlSessionFactoryBuilder()
              .build(inputStream);		
		SqlSession session = 
                         sqlSessionFactory.openSession();
		
		try {
			//Mapper接口:获取Mapper接口的 代理实现类对象
			EmployeeMapper mapper =
                 session.getMapper(EmployeeMapper.class);		
			Employee employee = 
                  mapper.getEmployeeById(1006);
			System.out.println(employee);
		} finally {
			session.close();
		}
	}