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[转] iBatis入门教程

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iBatis 简介:

 

iBatis apache 的一个开源项目,一个O/R Mapping 解决方案,iBatis 最大的特点就是小巧,上手很快。如果不需要太多复杂的功能,iBatis 是能够满足你的要求又足够灵活的最简单的解决方案,现在的iBatis 已经改名为Mybatis 了。

 

官网为:http://www.mybatis.org/

 

 

 

搭建iBatis 开发环境:

 

1 、导入相关的jar 包,ibatis-2.3.0.677.jarmysql-connector-java-5.1.6-bin.jar

 

        2 、编写配置文件:

 

              Jdbc 连接的属性文件

 

              总配置文件, SqlMapConfig.xml

 

              关于每个实体的映射文件(Map 文件)

 

 

 

Demo

 

Student.java:

 

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package com.iflytek.entity;
 
import java.sql.Date;
 
/**
 * @author xudongwang 2011-12-31
 *
 *         Email:xdwangiflytek@gmail.com
 *
 */
public class Student {
    // 注意这里需要保证有一个无参构造方法,因为包括Hibernate在内的映射都是使用反射的,如果没有无参构造可能会出现问题
    private int id;
    private String name;
    private Date birth;
    private float score;
 
    public int getId() {
        return id;
    }
 
    public void setId(int id) {
        this.id = id;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    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;
    }
 
    @Override
    public String toString() {
        return "id=" + id + "\tname=" + name + "\tmajor=" + birth + "\tscore="
                + score + "\n";
    }
 
}

 

SqlMap.properties

 

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driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/ibatis
username=root
password=123

 

Student.xml

 

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<?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>
    <!-- 通过typeAlias使得我们在下面使用Student实体类的时候不需要写包名 -->
    <typeAlias alias="Student" type="com.iflytek.entity.Student" />
 
    <!-- 这样以后改了sql,就不需要去改java代码了 -->
    <!-- id表示select里的sql语句,resultClass表示返回结果的类型 -->
    <select id="selectAllStudent" resultClass="Student">
        select * from
        tbl_student
    </select>
 
    <!-- parameterClass表示参数的内容 -->
    <!-- #表示这是一个外部调用的需要传进的参数,可以理解为占位符 -->
    <select id="selectStudentById" parameterClass="int" resultClass="Student">
        select * from tbl_student where id=#id#
    </select>
 
    <!-- 注意这里的resultClass类型,使用Student类型取决于queryForList还是queryForObject -->
    <select id="selectStudentByName" parameterClass="String"
        resultClass="Student">
        select name,birth,score from tbl_student where name like
        '%$name$%'
    </select>
 
    <insert id="addStudent" parameterClass="Student">
        insert into
        tbl_student(name,birth,score) values
        (#name#,#birth#,#score#);
        <selectKey resultClass="int" keyProperty="id">
            select @@identity as inserted
            <!-- 这里需要说明一下不同的数据库主键的生成,对各自的数据库有不同的方式: -->
            <!-- mysql:SELECT LAST_INSERT_ID() AS VALUE -->
            <!-- mssql:select @@IDENTITY as value -->
            <!-- oracle:SELECT STOCKIDSEQUENCE.NEXTVAL AS VALUE FROM DUAL -->
            <!-- 还有一点需要注意的是不同的数据库生产商生成主键的方式不一样,有些是预先生成 (pre-generate)主键的,如Oracle和PostgreSQL。
                有些是事后生成(post-generate)主键的,如MySQL和SQL Server 所以如果是Oracle数据库,则需要将selectKey写在insert之前 -->
        </selectKey>
    </insert>
 
    <delete id="deleteStudentById" parameterClass="int">
        <!-- #id#里的id可以随意取,但是上面的insert则会有影响,因为上面的name会从Student里的属性里去查找 -->
        <!-- 我们也可以这样理解,如果有#占位符,则ibatis会调用parameterClass里的属性去赋值 -->
        delete from tbl_student where id=#id#
    </delete>
 
    <update id="updateStudent" parameterClass="Student">
        update tbl_student set
        name=#name#,birth=#birth#,score=#score# where id=#id#
    </update>
 
</sqlMap>

 

说明:

 

如果xml 中没有ibatis 的提示,则window --> Preference--> XML-->XML Catalog---> 点击add

 

选择uri URI: 请选择本地文件系统上

 

iBatisDemo1/WebContent/WEB-INF/lib/sql-map-config-2.dtd 文件;

 

Key Type: 选择Schema Location;

 

Key: 需要联网的,不建议使用;

 

 

 

SqlMapConfig.xml

 

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<?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>
    <!-- 引用JDBC属性的配置文件 -->
    <properties resource="com/iflytek/entity/SqlMap.properties" />
    <!-- 使用JDBC的事务管理 -->
    <transactionManager type="JDBC">
        <!-- 数据源 -->
        <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>
    <!-- 这里可以写多个实体的映射文件 -->
    <sqlMap resource="com/iflytek/entity/Student.xml" />
</sqlMapConfig>

 

StudentDao

 

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package com.iflytek.dao;
 
import java.util.List;
 
import com.iflytek.entity.Student;
 
/**
 * @author xudongwang 2011-12-31
 *
 *         Email:xdwangiflytek@gmail.com
 *
 */
public interface StudentDao {
 
    /**
     * 添加学生信息
     *
     * @param student
     *            学生实体
     * @return 返回是否添加成功
     */
    public boolean addStudent(Student student);
 
    /**
     * 根据学生id删除学生信息
     *
     * @param id
     *            学生id
     * @return 删除是否成功
     */
    public boolean deleteStudentById(int id);
 
    /**
     * 更新学生信息
     *
     * @param student
     *            学生实体
     * @return 更新是否成功
     */
    public boolean updateStudent(Student student);
 
    /**
     * 查询全部学生信息
     *
     * @return 返回学生列表
     */
    public List<Student> selectAllStudent();
 
    /**
     * 根据学生姓名模糊查询学生信息
     *
     * @param name
     *            学生姓名
     * @return 学生信息列表
     */
    public List<Student> selectStudentByName(String name);
 
    /**
     * 根据学生id查询学生信息
     *
     * @param id
     *            学生id
     * @return 学生对象
     */
    public Student selectStudentById(int id);
 
}

 

StudentDaoImpl

 

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package com.iflytek.daoimpl;
 
import java.io.IOException;
import java.io.Reader;
import java.sql.SQLException;
import java.util.List;
 
import com.ibatis.common.resources.Resources;
import com.ibatis.sqlmap.client.SqlMapClient;
import com.ibatis.sqlmap.client.SqlMapClientBuilder;
import com.iflytek.dao.StudentDao;
import com.iflytek.entity.Student;
 
/**
 * @author xudongwang 2011-12-31
 *
 *         Email:xdwangiflytek@gmail.com
 *
 */
public class StudentDaoImpl implements StudentDao {
 
    private static SqlMapClient sqlMapClient = null;
 
    // 读取配置文件
    static {
        try {
            Reader reader = Resources
                    .getResourceAsReader("com/iflytek/entity/SqlMapConfig.xml");
            sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader);
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
 
    public boolean addStudent(Student student) {
        Object object = null;
        boolean flag = false;
        try {
            object = sqlMapClient.insert("addStudent", student);
            System.out.println("添加学生信息的返回值:" + object);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        if (object != null) {
            flag = true;
        }
        return flag;
    }
 
    public boolean deleteStudentById(int id) {
        boolean flag = false;
        Object object = null;
        try {
            object = sqlMapClient.delete("deleteStudentById", id);
            System.out.println("删除学生信息的返回值:" + object + ",这里返回的是影响的行数");
        } catch (SQLException e) {
            e.printStackTrace();
        }
        if (object != null) {
            flag = true;
 
        }
        return flag;
 
    }
 
    public boolean updateStudent(Student student) {
        boolean flag = false;
        Object object = false;
        try {
            object = sqlMapClient.update("updateStudent", student);
            System.out.println("更新学生信息的返回值:" + object + ",返回影响的行数");
        } catch (SQLException e) {
            e.printStackTrace();
        }
        if (object != null) {
            flag = true;
        }
        return flag;
    }
 
    public List<Student> selectAllStudent() {
        List<Student> students = null;
        try {
            students = sqlMapClient.queryForList("selectAllStudent");
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return students;
    }
 
    public List<Student> selectStudentByName(String name) {
        List<Student> students = null;
        try {
            students = sqlMapClient.queryForList("selectStudentByName",name);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return students;
    }
 
    public Student selectStudentById(int id) {
        Student student = null;
        try {
            student = (Student) sqlMapClient.queryForObject(
                    "selectStudentById", id);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return student;
    }
}

 

TestIbatis.java

 

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package com.iflytek.test;
 
import java.sql.Date;
import java.util.List;
 
import com.iflytek.daoimpl.StudentDaoImpl;
import com.iflytek.entity.Student;
 
/**
 * @author xudongwang 2011-12-31
 *
 *         Email:xdwangiflytek@gmail.com
 *
 */
public class TestIbatis {
 
    public static void main(String[] args) {
        StudentDaoImpl studentDaoImpl = new StudentDaoImpl();
 
        System.out.println("测试插入");
        Student addStudent = new Student();
        addStudent.setName("李四");
        addStudent.setBirth(Date.valueOf("2011-09-02"));
        addStudent.setScore(88);
        System.out.println(studentDaoImpl.addStudent(addStudent));
 
        System.out.println("测试根据id查询");
        System.out.println(studentDaoImpl.selectStudentById(1));
 
        System.out.println("测试模糊查询");
        List<Student> mohuLists = studentDaoImpl.selectStudentByName("李");
        for (Student student : mohuLists) {
            System.out.println(student);
        }
 
        System.out.println("测试查询所有");
        List<Student> students = studentDaoImpl.selectAllStudent();
        for (Student student : students) {
            System.out.println(student);
        }
 
        System.out.println("根据id删除学生信息");
        System.out.println(studentDaoImpl.deleteStudentById(1));
 
        System.out.println("测试更新学生信息");
        Student updateStudent = new Student();
        updateStudent.setId(1);
        updateStudent.setName("李四1");
        updateStudent.setBirth(Date.valueOf("2011-08-07"));
        updateStudent.setScore(21);
        System.out.println(studentDaoImpl.updateStudent(updateStudent));
 
    }
}

 

iBatis 的优缺点:

 

优点:

 

1、减少代码量,简单;

 

2、性能增强;

 

3、Sql 语句与程序代码分离;

 

4、增强了移植性;

 

缺点:

 

1、Hibernate 相比,sql 需要自己写;

2、参数数量只能有一个,多个参数时不太方便;

 

From: http://www.open-open.com/lib/view/open1325414956437.html

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