【ibatis】入门讲例

Ⅰ 、Ibatis项目机构

打开资源包，可以看到里面有一个simple_exzample的文件夹，在MyEclipse8.5中新建一个JAVA项目，将刚才的文件夹中内容复制到项目SRC下，这样的话呢，可以看到这样一个目录

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" alt="" width="357" height="229" />

Ⅱ、Ibatis的SQL语句配置类MySqlMapConfig.xml

<span style="font-size: medium;"><?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE sqlMapConfig
    PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN"
    "http://ibatis.apache.org/dtd/sql-map-config-2.dtd">

<sqlMapConfig>
  <transactionManager type="JDBC" commitRequired="false">
    <dataSource type="SIMPLE">
      <property name="JDBC.Driver" value="com.mysql.jdbc.Driver"/>
      <property name="JDBC.ConnectionURL" value="jdbc:mysql://127.0.0.1:3306/ibatis"/>
      <property name="JDBC.Username" value="root"/>
      <property name="JDBC.Password" value="root"/>
    </dataSource>
  </transactionManager>
  <sqlMap resource="com/mydomain/data/Employee.xml"/>

</sqlMapConfig>
</span>

使用的是MySQL数据库，所以要添加数据库驱动包，还有ibatis核心包，在看看数据库表该怎么建立，这得查看下Employee.xml了

Ⅲ、Employee.xml

<span style="font-size: medium;"><?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 namespace="Employee">

  <typeAlias alias="Employee" type="com.mydomain.domain.Employee"/>

  <resultMap id="AccountResult" class="Employee">
    <result property="id" column="ACC_ID"/>
    <result property="firstName" column="ACC_FIRST_NAME"/>
    <result property="lastName" column="ACC_LAST_NAME"/>
    <result property="emailAddress" column="ACC_EMAIL"/>
  </resultMap>

  <select id="selectAllAccounts" resultMap="AccountResult">
    select * from Employee
  </select>

  <select id="selectAccountById" parameterClass="int" resultClass="Employee">
    select
      ACC_ID as id,
      ACC_FIRST_NAME as firstName,
      ACC_LAST_NAME as lastName,
      ACC_EMAIL as emailAddress
    from Employee
    where ACC_ID = #id#
  </select>

  <insert id="insertAccount" parameterClass="Employee">
    insert into Employee (
      ACC_FIRST_NAME,
      ACC_LAST_NAME,
      ACC_EMAIL
    )values (
      #firstName#, #lastName#, #emailAddress#
    )
  </insert>

  <update id="updateAccount" parameterClass="Employee">
    update Employee set
      ACC_FIRST_NAME = #firstName#,
      ACC_LAST_NAME = #lastName#,
      ACC_EMAIL = #emailAddress#
    where
      ACC_ID = #id#
  </update>

  <delete id="deleteAccountById" parameterClass="int">
    delete from Employee where ACC_ID = #id#
  </delete>

</sqlMap></span>

上面的<ResultMap>标签中有指定每个Account属性对应的数据库的列名，所以就新建数据库了
 这样数据建立完成后，我们就可以测试了，这回就用到了SimpleExample.java类了

Ⅳ、SimpleExample.java

package com.mydomain.data;

import com.ibatis.sqlmap.client.SqlMapClient;
import com.ibatis.sqlmap.client.SqlMapClientBuilder;
import com.ibatis.common.resources.Resources;
import com.mydomain.domain.Account;

import java.io.Reader;
import java.io.IOException;
import java.util.List;
import java.sql.SQLException;

public class SimpleExample {

  private static SqlMapClient sqlMapper;

  static {
    try {
      Reader reader = Resources.getResourceAsReader("com/mydomain/data/MySqlMapConfig.xml");
      sqlMapper = SqlMapClientBuilder.buildSqlMapClient(reader);
      reader.close();
    } catch (IOException e) {
      throw new RuntimeException("Something bad happened while building the SqlMapClient instance." + e, e);
    }
  }

  public static List selectAllAccounts () throws SQLException {
    return sqlMapper.queryForList("selectAllAccounts");
  }

  public static Account selectAccountById  (int id) throws SQLException {
    return (Account) sqlMapper.queryForObject("selectAccountById", id);
  }

  public static void insertAccount (Account account) throws SQLException {
    sqlMapper.insert("insertAccount", account);
  }

  public static void updateAccount (Account account) throws SQLException {
    sqlMapper.update("updateAccount", account);
  }

  public static void deleteAccount (int id) throws SQLException {
    sqlMapper.delete("deleteAccountById", id);
  }

}

像上面的增删改查中用到的代替SQL语句的映射KEY，也是可以加上相应的XML文件的配置名称的，如：return sqlMapper.queryForList("Employee.selectAllAccounts")那么这个Account就是Account.xml的名称了
真正想看到测试结果得另写个JUNIT测试类，添加junit的jar包，这里我写了MyTest.java

Ⅴ、MyTest.java

package com.mydomain.data;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import org.junit.Test;

import com.mydomain.domain.Account;

public class MyTest {
    @Test
    public void selectAllAccounts(){
        try {
            List list=SimpleExample.selectAllAccounts();
            System.out.println(Arrays.toString(list.toArray()));
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public void selectAccountById(){
        try {
            Account account=SimpleExample.selectAccountById(1);
            System.out.println(account);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public void insertAccount(){
        Account account=new Account();
        account.setFirstName("tom");
        account.setLastName("jam");
        account.setEmailAddress("china");
        try {
            SimpleExample.insertAccount(account);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public void updateAccount(){
        try {
            Account account=SimpleExample.selectAccountById(2);
            account.setFirstName("gates");
            SimpleExample.updateAccount(account);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public void deleteAccount(){
        try {
            SimpleExample.deleteAccount(1);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

}

Ⅵ、顺便介绍下MyBatis

MyBatis来源于iBATIS，iBATIS是一个由Clinton Begin在2001年发起的开放源代码项目，iBATIS一词来源于“internet”和“abatis”的组合。该项目最初侧重于密码软件的开发，现在是一个基于Java的持久层框架。iBATIS提供的持久层框架包括SQL Maps和Data Access Objects（DAO），它是著名的ORM开发框架，分为Java和.NET版本，有着众多的追随者。

iBATIS更名为MyBatis并迁移到Google Code，此次项目迁移后，将启用新的网站http://www.mybatis.org/，由于目前只是改了名字，因此仍然可直接浏览iBatis的文档。
MyBatis开发团队希望脱离Apache而独立发展，并保证不会修改授权协议（Apache License）、代码完全兼容、包名不会更改、也不会删除 Apache站上的任何相关资源。改名后的第一次版本MyBatis 3.0.1已经发布，基于iBatis 3.0版本，该版本非常稳定，已经有很多用户使用了数周时间，修复了一些小bug。欲下载 MyBatis 3.0.1请到它新的网站http://www.mybatis.org/。 目前版本是3.0.2