ibatis和mybatis
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>
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>
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 }
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>
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>
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 }
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 }
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