iBatis学习

1.iBatis是apache的一个开源项目，一个O/R Mapping解决方案。

2.搭建环境

1）导入相关jar包，jdbc和ibatis

2）3类配置文件，数据源properties文件、sqlmapconfig文件、sqlmap配置文件

3.代码

 SqlMap.properties（配置数据源）

driver=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@172.21.0.77:1524:acdb
username=bnms
password=bnms

SqlMapConfig.xml（iBatis的sqlMapConfig配置文件，事务管理）

<?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="com/itcast/SqlMap.properties"/>
    <transactionManager type="JDBC">
        <dataSource type="SIMPLE">
            <property value="${driver}" name="JDBC.Driver"/>
            <property value="${url}" name="JDBC.ConnectionURL"/>
            <property value="${username}" name="JDBC.Username"/>
            <property value="${password}" name="JDBC.Password"/>
        </dataSource>
    </transactionManager>
    
    <sqlMap resource="com/itcast/Student.xml"/>
</sqlMapConfig>
        

Student.xml（sql文件）

<?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>
    <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>
    <insert id="insertStudent" parameterClass="Student" >
        insert into student (sid ,sname ,major, birth,score)
        values (#sid#,#sname#,#major#,#birth#,#score#)
    </insert>
    <delete id="deleteStudentById" parameterClass="int">
        delete from student where sid=#sid#
    </delete>
    <update id="updateStudent" parameterClass="Student">
         update  student set major=#major#,sname=#sname#,birth=#birth#,score=#score# 
         where sid=#sid#
    </update>
    <select id="selectStudentByName" parameterClass="String" resultClass="Student">
        select * from student where sname like '%$sname$%'
    </select>
    <insert id="insertStudentBySecquence"  parameterClass="Student" >
    <selectKey resultClass="int" keyProperty="sid">
        select studentPKSewuence.nextVal from dual
    </selectKey>
        insert into student (sid ,sname ,major, birth,score)
        values (#sid#,#sname#,#major#,#birth#,#score#)
    </insert>
</sqlMap>

Student.java（实体类）

package com.itcast;

import java.sql.Date;

public class Student {
    private int sid=0;
    private String sname=null;
    private String major=null;
    private Date birth=null;
    private float score=0;

    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 float getScore() {
        return score;
    }


    public void setScore(float score) {
        this.score = score;
    }
　　//重写toString方法
    public String toString() {
        String content="sid:"+sid+"	sname:"+sname+"	major:"+major+"	birth:"+birth+"	score:"+score;
        return content;
    }
    
}

IStudentDao.java

package com.itcast;

import java.util.List;

public interface IStudentDao {
　　//新增
    public void addStudent(Student student);
　　//新增，sequence自增长
    public void addStudentBysequence(Student student);
　　//根据id删除
    public void deleteStudentById(int  id);
　　//根据id修改
    public void updateStudentById(Student  student);
　　//查询所有记录
    public List<Student> queryAllStudents();
　　//模糊查询
    public List<Student> queryAllStudentsByName(String name);
　　//根据id查询
    public Student queryStudentById(int id);
    
}

StudentDao.java

package com.itcast;

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

import com.ibatis.sqlmap.client.SqlMapClient;

public class StudentDao 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) {
            e.printStackTrace();
        }
    }
    public void addStudent(Student student) {
        try {
            sqlMapClient.insert("insertStudent", student);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

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

    public void deleteStudentById(int id) {
        try {
            sqlMapClient.delete("deleteStudentById", id);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        
    }

    public List<Student> queryAllStudents() {
        List<Student> studentList=null;
        try {
            studentList=sqlMapClient.queryForList("selectAllStudent");
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return studentList;
    }

    public List<Student> queryAllStudentsByName(String name) {
         List<Student> students =null;
        try {
            students=sqlMapClient.queryForList("selectStudentByName", name);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return students;
    }

    public Student queryStudentById(int id) {
        Student student=null;
        try {
            student= (Student) sqlMapClient.queryForObject("selectStudentById",id);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return student;
    }

    public void updateStudentById(Student student) {
        try {
            sqlMapClient.update("updateStudent", student);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }
　　//测试
    public static void main(String[] args) {
        IStudentDao studentDao=new StudentDao();
        //queryAllStudents
//        for (Student student:studentDao.queryAllStudents()){
//            System.out.println(student);
//        }
        //queryStudentById
//        System.out.println(studentDao.queryStudentById(1));
        
        //addStudent
//        Student student=new Student();
//        student.setSid(13);
//        student.setSname("fang32");
//        student.setMajor("football");
//        student.setBirth(Date.valueOf("2010-04-02"));
//        student.setScore((float) 1.2343);
//        studentDao.addStudent(student);
//        
//        studentDao.deleteStudentById(2);
        
        Student student=new Student();
        student.setSid(101);
        student.setSname("tianzhen123");
        student.setMajor("football");
        student.setBirth(Date.valueOf("2010-04-02"));
        student.setScore((float) 1.2343);
        studentDao.updateStudentById(student);
        
//        for (Student student:studentDao.queryAllStudentsByName("fang")){
//            System.out.println(student);
//        }
        
        //insertStudentBySecquence
//        Student student=new Student();
//        //student.setSid(13);
//        student.setSname("fang32");
//        student.setMajor("football");
//        student.setBirth(Date.valueOf("2010-04-02"));
//        student.setScore((float) 1.2343);
//        studentDao.addStudentBysequence(student);
    }

}

项目结构：

4.总结：

优点：1）减少代码量2）简单3）架构级性能增强4）sql语句与程序代码分离5）简化项目分工6）增强移植性

缺点：1）sql需要自己写2）参数只能传一个