ibatis入门学习

搭建iBatis 开发环境:

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

2 、编写配置文件:

Jdbc 连接的属性文件 SqlMap.properties 

总配置文件, SqlMapConfig.xml

关于每个实体的映射文件(Map 文件)

Demo 

Student.java:

package com.iflytek.entity;



import java.sql.Date;



/**

 * @author xudongwang 2011-12-31

 * 

 *         Email:[email protected]

 * 

 */

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 

driver=com.mysql.jdbc.Driver

url=jdbc:mysql://localhost:3306/ibatis

username=root

password=123

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>

    <!-- 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 

<?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 

package com.iflytek.dao;



import java.util.List;



import com.iflytek.entity.Student;



/**

 * @author xudongwang 2011-12-31

 * 

 *         Email:[email protected]

 * 

 */

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 

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:[email protected]

 * 

 */

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 

 1 package com.iflytek.test;

 2 

 3 import java.sql.Date;

 4 import java.util.List;

 5 

 6 import com.iflytek.daoimpl.StudentDaoImpl;

 7 import com.iflytek.entity.Student;

 8 

 9 /**

10  * @author xudongwang 2011-12-31

11  * 

12  *         Email:[email protected]

13  * 

14  */

15 public class TestIbatis {

16 

17     public static void main(String[] args) {

18         StudentDaoImpl studentDaoImpl = new StudentDaoImpl();

19 

20         System.out.println("测试插入");

21         Student addStudent = new Student();

22         addStudent.setName("李四");

23         addStudent.setBirth(Date.valueOf("2011-09-02"));

24         addStudent.setScore(88);

25         System.out.println(studentDaoImpl.addStudent(addStudent));

26 

27         System.out.println("测试根据id查询");

28         System.out.println(studentDaoImpl.selectStudentById(1));

29 

30         System.out.println("测试模糊查询");

31         List<Student> mohuLists = studentDaoImpl.selectStudentByName("李");

32         for (Student student : mohuLists) {

33             System.out.println(student);

34         }

35 

36         System.out.println("测试查询所有");

37         List<Student> students = studentDaoImpl.selectAllStudent();

38         for (Student student : students) {

39             System.out.println(student);

40         }

41 

42         System.out.println("根据id删除学生信息");

43         System.out.println(studentDaoImpl.deleteStudentById(1));

44 

45         System.out.println("测试更新学生信息");

46         Student updateStudent = new Student();

47         updateStudent.setId(1);

48         updateStudent.setName("李四1");

49         updateStudent.setBirth(Date.valueOf("2011-08-07"));

50         updateStudent.setScore(21);

51         System.out.println(studentDaoImpl.updateStudent(updateStudent));

52 

53     }

54 }

 

 

 

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