1.创建一个接口:IUser,并在其中声明对应的操作方法
public interface IUser { @Select("select * from user where id= #{id}") public User getUserByID(int id); }
2. 创建对应映射接口的SQL语句
<?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> <typeAliases> <typeAlias alias="User" type="com.mybatis.models.User" /> </typeAliases> <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://127.0.0.1:3306/testdb" /> <property name="username" value="root" /> <property name="password" value="123456" /> </dataSource> </environment> </environments> <mappers> <mapper resource="com/mybatis/models/User.xml" />--> </mappers> </configuration>
在包:com.mybatis.models 下创建一个User.java 类文件
package com.mybatis.models; public class User { private int id; private String name; private String dept; private String phone; private String website; public String getWebsite() { return website; } public void setWebsite(String website) { this.website = website; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getDept() { return dept; } public void setDept(String dept) { this.dept = dept; } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone; } }
3.测试接口映射
在 src 这个目录下创建一个类:Main.java,用来测试整个配置和程序运行结果,有关 Main.java 的代码详细内容如下
import java.io.Reader; 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 com.mybatis.dao.IUser; import com.mybatis.models.User; public class Main { private static SqlSessionFactory sqlSessionFactory; private static Reader reader; static { try { reader = Resources.getResourceAsReader("config/Configure.xml"); sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader); sqlSessionFactory.getConfiguration().addMapper(IUser.class); } catch (Exception e) { e.printStackTrace(); } } public static SqlSessionFactory getSession() { return sqlSessionFactory; } public static void main(String[] args) { SqlSession session = sqlSessionFactory.openSession(); try { IUser iuser = session.getMapper(IUser.class); User user = iuser.getUserByID(1); System.out.println("名字:"+user.getName()); System.out.println("所属部门:"+user.getDept()); System.out.println("主页:"+user.getWebsite()); } finally { session.close(); } } }