一个使用ibatis对数据库增删改查的例子

一个使用ibatis对数据库增删改查的例子:
这里用的开发环境是:Eclipse3.2+mysql5.0.20,ibatis包是ibatis-common-2.jar,
ibatis-dao-2.jar,ibatis-sqlmap-2.jar,mysql包是mysql-connector-java-5.0.3-bin.jar.
步骤:
1.创建数据库:
 create database itcast;
 use itcast;
创建表：
 create table student
 (
  id int primary key auto_increment,
  firstname varchar(20) not null,
  lastname varchar(20) not null
 )

2.创建POJO类,Student.java，此程序中用到的所有类都放在cn.itcast包下面，
 其他的配置文件都放在txd.configfile包下面。
 package cn.itcast;
 
 public class Student {
  private Integer id;
 
  private String firstname;
 
  private String lastname;
 
  public String getFirstname() {
   return firstname;
  }
 
  public void setFirstname(String firstname) {
   this.firstname = firstname;
  }
 
  public Integer getId() {
   return id;
  }
 
  public void setId(Integer id) {
   this.id = id;
  }
 
  public String getLastname() {
   return lastname;
  }
 
  public void setLastname(String lastname) {
   this.lastname = lastname;
  }
 }

3.跟Student类对应的xml配置文件Student.xml,
 
 
 
  
  
   insert into student(firstname,lastname) values
   (#firstname#,#lastname#)
  
 
  
   select id, firstname, lastname from student
  
 
  
   delete from student where id=#value#
  
 
  
   update student set firstname=#firstname#,lastname=#lastname#
   where id=#id#
  
 

4.jdbc.properties文件,存储数据库连接的driver,url,username,password等信息,
 driver=com.mysql.jdbc.Driver
 url=jdbc:mysql:///itcast
 username=root
 password=

5. SqlMap的配置文件SqlMapConfigExample.xml,
 
  PUBLIC "-//iBATIS.com//DTD SQL Map Config 2.0//EN"
 "http://www.ibatis.com/dtd/sql-map-config-2.dtd">
 
 
  
  
  
     lazyLoadingEnabled="true" maxRequests="32" maxSessions="10"
   maxTransactions="5" useStatementNamespaces="false" />
 
  
  
   
   
    
    
    
    
   
  
  
  
 

6.MySqlMapClient.java类,用于产生一个SqlMapClient
 package cn.itcast;
 
 import java.io.IOException;
 import java.io.Reader;
 
 import com.ibatis.common.resources.Resources;
 import com.ibatis.sqlmap.client.SqlMapClient;
 import com.ibatis.sqlmap.client.SqlMapClientBuilder;
 
 public class MySqlMapClient {
 
  private static SqlMapClient sqlMapClient;
 
  static {
   String resource = "txd/configfile/SqlMapConfigExample.xml";
   Reader reader = null;
   try {
    reader = Resources.getResourceAsReader(resource);
    sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader);
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
 
  public static SqlMapClient getSqlMapInstance() {
   return sqlMapClient;
  }
 
 }

7.StudentManager 类测试一下上面的代码,
 package cn.itcast;
 
 import java.sql.SQLException;
 import java.util.List;
 
 import com.ibatis.sqlmap.client.SqlMapClient;
 
 public class StudentManager {
 
  public static void main(String[] args) {
   SqlMapClient sqlMap = MySqlMapClient.getSqlMapInstance();
 
   // insert一条记录
 
   // Student student = new Student();
   // student.setFirstname("zhang");
   // student.setLastname("san");
   // try {
   // sqlMap.insert("insert_student", student);
   // System.out.println("插入成功!");
   // } catch (SQLException e) {
   // e.printStackTrace();
   // }
 
   // delete一条记录
 
   // try {
   // int result = sqlMap.delete("delStudent", 5);
   // System.out.println(result);
   // } catch (SQLException e) {
   // e.printStackTrace();
   // }
 
   // update一条已存在的记录
 
   Student student = new Student();
   student.setId(1);
   student.setFirstname("jiang");
   student.setLastname("zemin");
   try {
    int result = sqlMap.update("updateStudent", student);
    System.out.println(result);
   } catch (SQLException e) {
    e.printStackTrace();
   }
 
   // query获得多条记录
 
   // try {
   // List list = sqlMap.queryForList("getStudent", null);
   // for (Student student : list) {
   // System.out
   // .println(student.getId() + "/t"
   // + student.getFirstname() + "/t"
   // + student.getLastname());
   // }
   // } catch (SQLException e) {
   // e.printStackTrace();
   // }
 
   // query单条记录
 
   // try {
   // Student student = (Student) sqlMap.queryForObject("getStudent", 1);
   // System.out.println(student.getId());
   // System.out.println(student.getFirstname());
   // System.out.println(student.getLastname());
   // } catch (SQLException e) {
   // e.printStackTrace();
   // }
  }
 
 }