ibatis和mybatis

Posted on 2011-09-29 12:56 技术总监阅读(225) 评论(0) 编辑收藏

研究ibatis和mybatis有一段时间，在网上找了很多资料，很多人都说二者没有区别，确实如些，他们的原理是一样的，但在映射文件的写法了，有了区别，不知

被谷歌收购了就命名为mybatis，写法上，有了改变，要是再被其他公司收购，难道不会再发生改变吗？这害惨的我们这些写程序的人，在这里我写了一些例子供大家参考：

本人写了个简单图书管理的程序了，就做了一下简单的CRUD操作

一、ibatis

1.配制数源源的xml文件(SqlMapConfig.xml)

代码如下：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE sqlMapConfig PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-config-2.dtd" >
 3 <sqlMapConfig>
 4     <transactionManager type="JDBC">
 5         <dataSource type="SIMPLE">
 6             <property name="JDBC.Driver" value="com.mysql.jdbc.Driver" />
 7             <property name="JDBC.ConnectionURL" value="jdbc:mysql://localhost:3306/test" />
 8             <property name="JDBC.Username" value="root" />
 9             <property name="JDBC.Password" value="123456" />
10         </dataSource>
11     </transactionManager>
12 
13     <sqlMap resource="com/softeam/beans/Myemp.xml" />
14     <sqlMap resource="com/softeam/beans/Category.xml" />
15     <sqlMap resource="com/softeam/beans/Book.xml" />
16 </sqlMapConfig>

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sqlManConfig中有两个子节点 transactionManager（事物管理）和sqlMap（类xml文件地址）

transactionManager中datasource节点就是我们配制的sql数据源(Driver,ConnectionURL,Username,Password),我采用的数据是mysql

2.我们再来看一下类相关的配制文件，这可以本节中的重点哦！！！

就将book.xml中的源码贴出来吧：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd" >
 3 <sqlMap namespace="Book">
 4     <typeAlias alias="Book" type="com.softeam.beans.Book" />
 5     <resultMap class="com.softeam.beans.Category" id="categoryMapper">
 6         <result property="c_id" column="c_id" javaType="Integer"
 7             jdbcType="INTEGER" />
 8         <result property="c_name" column="c_name" javaType="java.lang.String"
 9             jdbcType="VARCHAR" />
10     </resultMap>
11     <resultMap class="com.softeam.beans.Book" id="bookMapper">
12         <result property="id" column="id" javaType="Integer" jdbcType="INTEGER" />
13         <result property="name" column="name" javaType="java.lang.String"
14             jdbcType="VARCHAR" />
15         <result property="author" column="author" javaType="java.lang.String"
16             jdbcType="VARCHAR" />
17         <result property="categoryid" column="categoryid" javaType="INTEGER"
18             jdbcType="INTEGER" />
19         <result property="category" column="categoryid"  select="SelBookById" />
20     </resultMap>
21     <insert id="InsBook" parameterClass="com.softeam.beans.Book">
22         insert into
23         book(name,author,categoryid)
24         values(#name#,#author#,#categoryid#)
25     </insert>
26     <select id="SelBookByAll"  resultMap="bookMapper">
27         select b.*,c.id as
28         c_id,c.name as c_name from book
29         b,category c where
30         b.categoryid=c.id
31         limit #begin#,5
32    </select>
33     <select id="SelBookById" resultClass="com.softeam.beans.Category">
34         select * from category where id=#id#
35    </select>
36     <delete id="DelBookById" parameterClass="INTEGER">
37         delete from book where
38         id=#id#
39    </delete>
40     <update id="UpdateBook" parameterClass="com.softeam.beans.Book">
41         update book set
42         name=#name#,author=#author#,categoryid=#categoryid# where
43         id=#id#
44     </update>
45 </sqlMap>

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这就是与hibernate的区别，hibernate不需要写大量的sql语句，这样灵活性低，而我的ibatis和mybaits,就可以写相应的sql语句，灵活性比较大。我们在这里就重点说一下联合查询。

我们来联合一下book(图书),Category(图书种类)，如下两个resultmap,第二个book列表是我们的重点。这就与我们的类book.java有关了，现贴出代码，我想众位一看便知：

 1 package com.softeam.beans;
 2 import java.io.Serializable;
 3 public class Book implements Serializable {
 4     private Integer id;
 5     private String name;
 6     private String author;
 7     private Integer categoryid;
 8     private Category category;
 9     public Book(Integer id, String name, String author, Integer categoryid) {
10         this.id = id;
11         this.name = name;
12         this.author = author;
13         this.categoryid = categoryid;
14     }
15     public Book() {
16     }
17     public Book(Integer id) {
18         this.id = id;
19     }
20     public Integer getId() {
21         return this.id;
22     }
23     public void setId(Integer id) {
24         this.id = id;
25     }
26     public Category getCategory() {
27         return category;
28     }
29     public void setCategory(Category category) {
30         this.category = category;
31     }
32     public String getName() {
33         return this.name;
34     }
35 
36     public void setName(String name) {
37         this.name = name;
38     }
39 
40     public String getAuthor() {
41         return this.author;
42     }
43 
44     public void setAuthor(String author) {
45         this.author = author;
46     }
47 
48     public Integer getCategoryid() {
49         return this.categoryid;
50     }
51 
52     public void setCategoryid(Integer categoryid) {
53         this.categoryid = categoryid;
54     }
55 }

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我们是定义了Category的类字段名的，所以我们的配制文件，有该属性，这也是方便我们联合查询，也不再此说太多了，说太多可能把大家搞混了。我们就再来看一下mybatis吧，到底和ibatis是不是一样呢

一样贴出数据源配制文件（configuration.xml）和一个xml映射文件（book.xml）

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE configuration PUBLIC
 3     "-//mybatis.org//DTD Config 3.0//EN"
 4     "http://mybatis.org/dtd/mybatis-3-config.dtd">
 5 <configuration>
 6     <environments default="development">
 7         <environment id="development">
 8             <transactionManager type="JDBC" />
 9             <dataSource type="POOLED">
10                 <property name="driver" value="com.mysql.jdbc.Driver" />
11                 <property name="url" value="jdbc:mysql://localhost:3306/test" />
12                 <property name="username" value="root" />
13                 <property name="password" value="123456" />
14             </dataSource>
15         </environment>
16     </environments>
17     <mappers>
18         <mapper resource="com/softeam/beans/User.xml" />
19         <mapper resource="com/softeam/beans/Book.xml" />
20         <mapper resource="com/softeam/beans/Myemp.xml" />
21         <mapper resource="com/softeam/beans/Category.xml" />
22     </mappers>
23 </configuration>

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book.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 3 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 4 <mapper namespace="Book">
 5     <resultMap type="com.softeam.beans.Category" id="categoryMapper">
 6         <id property="c_id" column="c_id" javaType="java.lang.Integer" jdbcType="INTEGER"/>
 7         <result property="c_name" column="c_name" javaType="java.lang.String" jdbcType="VARCHAR"/>
 8     </resultMap>
 9    <resultMap type="com.softeam.beans.Book" id="bookMapper">
10         <id property="id" column="id" javaType="java.lang.Integer" jdbcType="INTEGER"/>
11         <result property="name" column="name" javaType="java.lang.String" jdbcType="VARCHAR"/>
12          <result property="author" column="author" javaType="java.lang.String" jdbcType="VARCHAR"/>
13         <association property="category" column="categoryid" javaType="com.softeam.beans.Category" resultMap="categoryMapper"  />
14     </resultMap>
15    
16    <insert id="InsBook" parameterType="com.softeam.beans.Book">
17             insert into book(name,author,categoryid) values(#{name},#{author},#{categoryid})
18    </insert>
19    <select id="SelBookByAll" parameterType="INTEGER" resultMap="bookMapper">
20             select b.*,c.id as c_id,c.name as c_name from book b,category c where b.categoryid=c.id limit #{begin},5
21    </select>
22    <delete id="DelBookById" parameterType="INTEGER">
23            delete from book where id=#{id}
24    </delete>
25    <update id="UpdateBook" parameterType="com.softeam.beans.Book">
26       update book set name=#{name},author=#{author},categoryid=#{categoryid} where id=#{id}
27    </update>
28 </mapper>

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数据操作session的创建也跟大家贴一下:

ibatis:

 1 package com.softeam.dao;
 2 
 3 import java.io.IOException;
 4 import java.io.Reader;
 5 
 6 import com.ibatis.common.resources.Resources;
 7 import com.ibatis.sqlmap.client.SqlMapClient;
 8 import com.ibatis.sqlmap.client.SqlMapClientBuilder;
 9 
10 public class MyConn {
11     private static SqlMapClient sqlMapper;
12     
13     static{
14         try {
15             Reader reader=Resources.getResourceAsReader("SqlMapConfig.xml");
16             sqlMapper=SqlMapClientBuilder.buildSqlMapClient(reader);
17             reader.close();
18         } catch (IOException e) {
19             e.printStackTrace();
20         }
21     }
22     public static SqlMapClient getSqlMapper() {
23         return sqlMapper;
24     }
25     public static void main(String[] args) {
26         MyConn conn=new MyConn();
27     }
28 }

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mybatis:

 1 package com.softeam.dao;
 2 
 3 import java.io.IOException;
 4 import java.io.Reader;
 5 
 6 import org.apache.ibatis.io.Resources;
 7 import org.apache.ibatis.session.SqlSession;
 8 import org.apache.ibatis.session.SqlSessionFactory;
 9 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
10 
11 public class DBSession {
12     public static SqlSession GetSession() {
13         String resource = "configuration.xml";
14         Reader reader;
15         try {
16             reader = Resources.getResourceAsReader(resource);
17             SqlSessionFactory sqlmapper = new SqlSessionFactoryBuilder()
18             .build(reader);
19             SqlSession session = sqlmapper.openSession();
20             return session;
21         } catch (IOException e) {
22             // TODO Auto-generated catch block
23             System.out.println("创建session出错");
24             return null;
25         }
26     
27     
28     }
29 }

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有什么区别大家不访自己比较一下，结果请留言！！！谢谢！

源码下载地址:http://download.csdn.net/detail/chenjie200280/3646602

相关参考资料下载地址:http://download.csdn.net/detail/chenjie200280/3646609

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原文地址：https://www.cnblogs.com/lexus/p/2340786.html