Mybatis入门 digest

<?xml version="1.0" encoding="UTF-8" ?>   
<!DOCTYPE mapper   
PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"  
"http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd"> 
<mapper namespace="com.dy.dao.UserDao">

   <select id="findUserById" resultType="com.dy.entity.User" > 
      select * from user where id = #{id}
   </select>

</mapper>

package com.dy.entity;

public class User {

    private int id;
    private String name;
    private String password;
    private int age;
    private int deleteFlag;
    
    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 getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public int getDeleteFlag() {
        return deleteFlag;
    }
    public void setDeleteFlag(int deleteFlag) {
        this.deleteFlag = deleteFlag;
    }
    
}

package com.dy.dao;

import java.util.List;

import com.dy.entity.User;

public interface UserDao {

    public void insert(User user);
    
    public User findUserById (int userId);
    
    public List<User> findAllUsers();
    
}

//外部调用此方法对mybatis配置文件进行解析
19   public Configuration parse() {
20     if (parsed) {
21       throw new BuilderException("Each XMLConfigBuilder can only be used once.");
22     }
23     parsed = true;
24     //从根节点configuration
25     parseConfiguration(parser.evalNode("/configuration"));
26     return configuration;
27   }
28 
29   //此方法就是解析configuration节点下的子节点
30   //由此也可看出，我们在configuration下面能配置的节点为以下10个节点
31   private void parseConfiguration(XNode root) {
32     try {
33       propertiesElement(root.evalNode("properties")); //issue #117 read properties first
34       typeAliasesElement(root.evalNode("typeAliases"));
35       pluginElement(root.evalNode("plugins"));
36       objectFactoryElement(root.evalNode("objectFactory"));
37       objectWrapperFactoryElement(root.evalNode("objectWrapperFactory"));
38       settingsElement(root.evalNode("settings"));
39       environmentsElement(root.evalNode("environments")); // read it after objectFactory and objectWrapperFactory issue #631
40       databaseIdProviderElement(root.evalNode("databaseIdProvider"));
41       typeHandlerElement(root.evalNode("typeHandlers"));
42       mapperElement(root.evalNode("mappers"));
43     } catch (Exception e) {
44       throw new BuilderException("Error parsing SQL Mapper Configuration. Cause: " + e, e);
45     }
46   }
47 }