ibatis 入门学习

ibatis 是apache的一个开源项目，一个ORM解决方案，ibatis最大的特点是小巧，上手快。

如果不需要太多复杂的功能，ibatis是能满足你的要求又足够灵活的最简单的解决方案。

ibatis
搭建环境
配置文件
读取配置
基本的CURD操作
模糊查询
自动主键selectKey

建立一个工程目录大致如下：

搭建环境：导入相关的jar包
oracle的jdbc驱动包，ibatis的jar包

配置文件：SqlMap.properties

driver=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@127.0.0.1:1521:orcl
username=ar
password=ar

总配置文件:SqlMapConfig.xml

<?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>

  <!-- Configure a built-in transaction manager.  If you're using an 
       app server, you probably want to use its transaction manager 
       and a managed datasource -->
  <properties resource="com/itcast/SqlMap.properties"/>
  
  <transactionManager type="JDBC" commitRequired="false">
    <dataSource type="SIMPLE">
      <property name="JDBC.Driver" value="${driver}"/>
      <property name="JDBC.ConnectionURL" value="${url}"/>
      <property name="JDBC.Username" value="${username}"/>
      <property name="JDBC.Password" value="${password}"/>
    </dataSource>
  </transactionManager>

  <!-- List the SQL Map XML files. They can be loaded from the 
       classpath, as they are here (com.domain.data...) -->
  <sqlMap resource="com/itcast/Student.xml"/>


</sqlMapConfig>

Student.xml

<?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="Student">

	<!-- 取别名-->
	<typeAlias alias="Student" type="com.itcast.Student" />

	<select id="selectAllStudent" resultClass="Student">
		select * from student
	</select>

	<select id="selectStudentById" parameterClass="int" resultClass="Student">
	select * from student
	where sid=#sid#
	
	</select>
	
        <!-- 模糊查询使用$符号 -->
 <select id="queryStudentByName" parameterClass="String" resultClass="Student">select * from studentwhere sname like '%$sname$%'</select><insert id="insertStudent" parameterClass="Student">insert into student(sid,sname,major,score,birth)values(#sid#,#sname#,#major#,#score#,#birth#)</insert>
<insert id="insertStudentBySequence" parameterClass="Student">
                <!-- 使用自动主键,使用sequence实现主键自增 -->
 <selectKey resultClass="int" keyProperty="sid" >select studentPKSequence.nextValfrom dual</selectKey>insert into student(sid,sname,major,birth,score)values(#sid#,#sname#,#major#,#birth#,#score#)</insert><delete id="deleteStudentById" parameterClass="int">delete from studentwhere sid=#sid#</delete><update id="updateStudentById" parameterClass="Student"> update studentset sname=#sname#, major=#major#, birth=#birth#, score=#score#where sid=#sid#</update></sqlMap>

IStudentDAO.java

package com.itcast;

import java.util.List;

public interface IStudentDAO
{
	public void addSutdent(Student student);
	public void addStudentBySequence(Student student);
	public void deleteStudentById(int id);
	public void updateStudentById(Student student);
	public List<Student> queryAllStudent();
	public List<Student> queryStudentByName(String name);
	public Student queryStudentById(int id);
}

IStudentDAOImpl.java

package com.itcast;
import java.io.IOException;
import java.io.Reader;
import java.math.BigDecimal;
import java.sql.Date;
import java.sql.SQLException;
import java.util.List;

import com.ibatis.sqlmap.client.SqlMapClient;


public class IStudentDAOImpl implements IStudentDAO
{
	private static SqlMapClient sqlMapClient = null;
	
	static
	{
		try
		{
			Reader reader = com.ibatis.common.resources.Resources.getResourceAsReader("com/itcast/SqlMapConfig.xml");
			sqlMapClient = com.ibatis.sqlmap.client.SqlMapClientBuilder.buildSqlMapClient(reader);
			reader.close();
		} catch (IOException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	@Override
	public void addSutdent(Student student)
	{
		try
		{
			sqlMapClient.insert("insertStudent", student);
		} catch (SQLException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

	@Override
	public void addStudentBySequence(Student student)
	{
		try
		{
			sqlMapClient.insert("insertStudentBySequence", student);
			System.out.println("sid=" + student.getSid());
		} catch (SQLException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

	@Override
	public void deleteStudentById(int id)
	{
		try
		{
			System.out.println(sqlMapClient.delete("deleteStudentById", id));
		} catch (SQLException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

	@Override
	public void updateStudentById(Student student)
	{
		try
		{
			System.out.println("更新行数：" + sqlMapClient.update("updateStudentById", student));
		} catch (SQLException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

	@Override
	public List<Student> queryAllStudent()
	{
		List<Student> studentList = null;
		try
		{
			studentList = sqlMapClient.queryForList("selectAllStudent");
		} catch (SQLException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return studentList;
	} 

	@Override
	public List<Student> queryStudentByName(String name)
	{
		List<Student> list = null;
		try
		{
			list = sqlMapClient.queryForList("queryStudentByName", name);
		} catch (SQLException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return list;
	}

	@Override
	public Student queryStudentById(int id)
	{
		Student student = null;
		try
		{
			student = (Student)sqlMapClient.queryForObject("selectStudentById",id);
		} catch (SQLException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return student;
	}
	
	public static void main(String[] args)
	{
		IStudentDAO dao = new IStudentDAOImpl();
//		for(Student student : dao.queryAllStudent())
//		{
//			System.out.println(student);
//		}
//		Student student = dao.queryStudentById(2);
		
//		Student student = new Student();
//		student.setSid(4);
//		student.setSname("sname");
//		student.setMajor("major");
//		student.setScore(new BigDecimal(98));
//		//student.setBirth(new Date(System.currentTimeMillis()));
//		student.setBirth(Date.valueOf("2013-05-30"));
//		
//		dao.addSutdent(student);
		

// 		for(Student stu : dao.queryStudentByName("lei"))
//		{
//			System.out.println(stu);
//		}
		
//		dao.deleteStudentById(4);
		
//		Student student = new Student();
//		student.setSname("wwwwlei");
//		student.setMajor("games");
//		student.setBirth(Date.valueOf("2011-05-23"));
//		student.setScore(new BigDecimal(86));
//		student.setSid(2);
//		dao.updateStudentById(student);
		
		Student student = new Student();
		student.setSname("wwwwlei");
		student.setMajor("games");
		student.setBirth(Date.valueOf("2011-05-23"));
		student.setScore(new BigDecimal(88));
		dao.addStudentBySequence(student);
		
	}

}

Student.java

package com.itcast;

import java.math.BigDecimal;
import java.sql.Date;

public class Student
{
	private int sid = 0;
	private String sname = null;
	private String major = null;
	private Date birth = null;
	private BigDecimal score = BigDecimal.ZERO;
	public int getSid()
	{
		return sid;
	}
	public void setSid(int sid)
	{
		this.sid = sid;
	}
	public String getSname()
	{
		return sname;
	}
	public void setSname(String sname)
	{
		this.sname = sname;
	}
	public String getMajor()
	{
		return major;
	}

	public void setMajor(String major)
	{
		this.major = major;
	}
	public Date getBirth()
	{
		return birth;
	}
	public void setBirth(Date birth)
	{
		this.birth = birth;
	}
	public BigDecimal getScore()
	{
		return score;
	}
	public void setScore(BigDecimal score)
	{
		this.score = score;
	}
	@Override
	public String toString()
	{
		String content = "sid="+sid
		+"\tsname="+sname
		+"\tmajor="+major
		+"\tbirth="+birth
		+"\tscore="+score;
		return content;
	}
}

CRUD的操作：

借助SqlMapClient中的方法：
queryForObject
queryForList
insert
delete
update


create table student
(
sid number not null,
sname varchar2(20),
major varchar2(20),
birth date,
score number
)




创建序列：


create sequence studentPKSequence start with 1 increment by 1;