最近2天在学ibatis，心里也有一些心得，就把它写下来了。

首先是配置一下ibatis的环境，添加ibatis2.X.jar，mysql-connection-bin.5.1.8.jar，建立一个web项目:

0、写个类User.jsva 有属性：.....（自己写），建个表：user.sql

1、先建一个数据库文件dataSource.properties,内容如下：

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test
jdbc.username=root
jdbc.password=root

2、这是ibatis的核心文件：sqlmap-config.xml,内容如下：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE sqlMapConfig
    PUBLIC "-//iBATIS.com//DTD SQL Map Config 2.0//EN"
    "http://www.ibatis.com/dtd/sql-map-config-2.dtd">
   
<sqlMapConfig>
 <properties resource="dataSource.properties"></properties>
 <transactionManager type="JDBC">
  <dataSource type="SIMPLE">
   <property name="JDBC.Driver" value="${jdbc.driver}" />
   <property name="JDBC.ConnectionURL" value="${jdbc.url}" />
   <property name="JDBC.Username" value="${jdbc.username}" />
   <property name="JDBC.Password" value="${jdbc.password}" ></property>
  </dataSource>
 </transactionManager>
 <sqlMap resource="com/resource/User.xml" />
</sqlMapConfig>

3、建立一个user.xml文件，该文件里面写的是sql语句，这就是ibatis比hibernate查询数据更灵活的优势所在，简单的CRUD：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE sqlMap     
    PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"     
    "http://ibatis.apache.org/dtd/sql-map-2.dtd">
<sqlMap>
 <!-- 定义类别名 -->
 <typeAlias alias="User" type="com.bean.User" />
 
 <!-- 查询所有 -->
 <select id="getAllUsers" resultClass="User">
  select *
  from user
 </select>
 
 <!-- 添加 -->
 <insert id="saveUser" parameterClass="User">
  insert into user (name,password,sex,address,phone,email)
  values
  (#name#,#password#,#sex#,#address#,#phone#,#email#)
  <selectKey resultClass="int" keyProperty="id">
   select last_insert_id()
  </selectKey>
 </insert>
 
 <!-- 根据ID查询 -->
 <select id="getById" parameterClass="int" resultClass="User">
  select * from user u where u.id = #id#
 </select>
 
 <!-- 删除 -->
 <delete id="deleteUser" parameterClass="int">
  delete from user  where id = #id#
 </delete>
 
 <update id="updateById" parameterClass="User">
  update user u set u.name=#name#,u.password=#password#,u.sex=#sex#,u.address=#address#,u.phone=#phone#,u.email=#email#
  where u.id=#id#
 </update>
</sqlMap>

4、最后是测试。写个main()方法，测试一下是否搭建成功

public class IbatisDemo {

public static void main(String[] args) throws IOException, Exception {
//  list();
//  User user = new User();
//  user.setName("ibatis");
//  user.setPassword("123");
//  user.setSex("男");
//  user.setAddress("广州天河");
//  user.setPhone("1324567");
//  user.setEmail("123@qq.com");
//  add(user);

// get(24);
  
//  User user = new User();
//  user.setName("ibatis2");
//  user.setPassword("1232");
//  user.setSex("男");
//  user.setAddress("广州天河2");
//  user.setPhone("13245672");
//  user.setEmail("123@qq.com2");
//  user.setId(23);
//  update(user);
  
//  delete1(23);

}
 
 public static void list() throws IOException, SQLException{
  Reader reader = Resources.getResourceAsReader("sqlmap-config-user.xml");
  SqlMapClient sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader);
  List<User> list = sqlMapClient.queryForList("getAllUsers");
  for(User user : list){
   System.out.println(user);
  }
 }

public static void add(User user) throws IOException, SQLException{
  Reader reader = Resources.getResourceAsReader("sqlmap-config-user.xml");
  SqlMapClient sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader);
  sqlMapClient.insert("saveUser",user);
 }
 public static void get(Integer id) throws IOException, SQLException{
  Reader reader = Resources.getResourceAsReader("sqlmap-config-user.xml");
  SqlMapClient sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader);
  //可以实现 方法一：
  //List<User> list = sqlMapClient.queryForList("getById",id);
  //for(User user:list){
  // System.out.println("----------------"+list.size());
  //}
  //方法2：
  User user0 = (User) sqlMapClient.queryForObject("getById",id);
  System.out.println("----------------"+user0.getName());
 }
 
 public static void delete1(int id) throws IOException, SQLException{
  Reader reader = Resources.getResourceAsReader("sqlmap-config-user.xml");
  SqlMapClient sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader);
  sqlMapClient.delete("deleteUser", id);
 }
 
 public static void update(User user) throws IOException, SQLException{
  Reader reader = Resources.getResourceAsReader("sqlmap-config-user.xml");
  SqlMapClient sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader);
  sqlMapClient.update("updateById", user);
 }
}