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  • ibaits的一个简单的完整的例子

    ibaits的简单介绍:

      iBatis 是apache 的一个开源项目,一个O/R Mapping(对象/关系映射) 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。

    搭建ibaits环境需要的一些资源jar包:

      ibatis-2.3.4.726.jar 、

      mysql-connector-java-5.1.20-bin.jar

    下面是配置相关文件:

    1、首先配置一个SqlMapConfig.xml文件:

      注:它的里面是与jdbc(连接数据库)一些相关的配置和引入实体类的映射文件

     1 <?xml version="1.0" encoding="UTF-8" ?>
     3 <!DOCTYPE sqlMapConfig      
     4     PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN"      
     5     "http://ibatis.apache.org/dtd/sql-map-config-2.dtd">
     6 
     7 <sqlMapConfig>
     8 
     9   <properties resource="com/configs/SqlMap.properties"/>  
    10     
    11   <transactionManager type="JDBC">
    12     <dataSource type="SIMPLE">
    13       <property name="JDBC.Driver" value="${driver}"/>
    14       <property name="JDBC.ConnectionURL" value="${url}"/>
    15       <property name="JDBC.Username" value="${username}"/>
    16       <property name="JDBC.Password" value="${password}"/>
    17     </dataSource>
    18   </transactionManager>
    19   
    20   <sqlMap resource="com/configs/Student.xml"/>
    21 </sqlMapConfig>
    <properties resource="com/configs/SqlMap.properties"/>是引入的属性配置,它的里面是跟数据库连接的一些属性,具体见下。

    2、配置一个属性文件SqlMap.properties:在SqlMapConfig.xml里面通过el表达式获取相应的值
    driver=com.mysql.jdbc.Driver
    url=jdbc:mysql://localhost:3306/user
    username=root
    password=111111

    3、接着配置一个实体类的映射文件,暂且就用Student表示实体,对应文件为Student.xml:

      注:它的里面是对实体的一些操作,即增、删、改、查。

     1 <?xml version="1.0" encoding="UTF-8"?>
     2 <!DOCTYPE sqlMap 
     3     PUBLIC "-//iBATIS.com//DTD SQL Map 2.0//EN" 
     4     "http://www.ibatis.com/dtd/sql-map-2.dtd">
     5 
     6 <sqlMap>
     7     <typeAlias alias="Student" type="com.domain.Student"/>
     8     <!-- 
     9         查询记录
    10      -->
    11     <select id="selectAllStudent" resultClass="Student">  <!-- resultClass与上方sqlMap定义的映射对应 -->
    12         select *
    13         from Student
    14     </select>
    15     <!-- 根據指定id查詢 -->
    16     <select id="selectStudentById" parameterClass="integer" resultClass="Student">
    17         select *
    18         from Student
    19         where sid = #sid#
    20     </select>
    21     <!-- 模糊查询 -->
    22     <select id="selectStudentByName" parameterClass="String" resultClass="Student">
    23         select sid,sname,birthday,score
    24         from student
    25         where sname like '%$sname$%'
    26     </select>
    27     
    28     <!-- 
    29         插入记录
    30      -->
    31     <insert id="insertStudent" parameterClass="Student">
    32         insert into Student
    33             (sid,sname,birthday,score)
    34         values               
    35             (#sid#,#sname#,#birthday#,#score#)
    36     </insert>
    37     
    38     <!-- **通过序列增加学生 -->
    39     <insert id="insertStudentBySequence" parameterClass="Student">
    40         <selectKey resultClass="integer" keyProperty="sid">
    41             select studentPKSequence.nextVal
    42             from dual
    43         </selectKey>
    44             insert into Student(sid,sname,birthday,score)
    45             values(#sid#,#sname#,#birthday#,#score#)
    46     </insert>
    47     
    48     <!-- 
    49         删除记录
    50      -->
    51      <delete id="deleteStudentById" parameterClass="integer">
    52          delete 
    53          from Student
    54          where sid = #sid#
    55      </delete>
    56      
    57      <!-- 修改记录 -->
    58      <update id="updateStudentById" parameterClass="Student">
    59          update Student
    60          set sname = #sname#,
    61              birthday = #birthday#,
    62              score = #score#
    63          where sid = #sid#
    64      </update>
    65 </sqlMap>

    4、接下来就是实体bean和dao了

      Student实体类:

     1 package com.domain;
     2 import java.sql.Date;
     3 
     4 public class Student
     5 {
     6     private Integer sid = 0;
     7     private String sname = null;
     8     private Date birthday = null;
     9     private float score = 0;
    10 
    11     public Integer getSid()
    12     {
    13         return sid;
    14     }
    15 
    16     public void setSid(Integer sid)
    17     {
    18         this.sid = sid;
    19     }
    20 
    21     public String getSname()
    22     {
    23         return sname;
    24     }
    25 
    26     public void setSname(String sname)
    27     {
    28         this.sname = sname;
    29     }
    30 
    31     public Date getBirthday()
    32     {
    33         return birthday;
    34     }
    35 
    36     public void setBirthday(Date birthday)
    37     {
    38         this.birthday = birthday;
    39     }
    40 
    41     public float getScore()
    42     {
    43         return score;
    44     }
    45 
    46     public void setScore(float score)
    47     {
    48         this.score = score;
    49     }
    50 
    51     @Override
    52     public String toString()
    53     {
    54         String context = "sid=:" + sid + "	sname=:" + sname + "	birthday=:"
    55                 + birthday + "'	score=:" + score;
    56         return context;
    57     }
    59 }

     实体dao接口:

     1 package com.dao;
     2 
     3 import java.util.List;
     4 
     5 import com.domain.Student;
     6 
     7 public interface IStudentDao
     8 {
     9     /*
    10      * 添加学生
    11      */
    12     public void addStudent(Student student);
    13     
    14     /*
    15      * 通过序列增加学生
    16      */
    17     public void addStudentBySequence(Student student);
    18     
    19     /*
    20      * 根据传入的id删除学生
    21      */
    22     public void deleteStudentById(Integer id);
    23     
    24     /*
    25      * 根据传入的id修改学生
    26      */
    27     public void updateStudentById(Student student);33     
    34     /*
    35      * 查询所有学生信息
    36      */
    37     public List<Student> queryAllStudent();
    38     
    39     /*
    40      * 根据传入的名称查询学生
    41      */
    42     public List<Student> queryStudentByName(String name);
    43     
    44     /*
    45      * 根据传入的id查询学生
    46      */
    47     public Student queryStudentById(Integer id);
    48 }

      dao的实现类:

      1 package com.dao.impl;
      2 
      3 import java.io.Reader;
      4 import java.sql.SQLException;
      5 import java.util.List;
      6 
      7 import com.dao.IStudentDao;
      8 import com.domain.Student;
      9 import com.ibatis.common.resources.Resources;
     10 import com.ibatis.sqlmap.client.SqlMapClient;
     11 import com.ibatis.sqlmap.client.SqlMapClientBuilder;
     12 
     13 public class IStudentDaoImpl implements IStudentDao
     14 {
     15 
     16     private static SqlMapClient sqlMapClient = null;
     17     
     18     /**
     19      * 在内存中只加载一次
     20      */
     21     static 
     22     {
     23         try
     24         {
     25             /*
     26              * 讀取配置文件
     27              */
     28             Reader reader = Resources.getResourceAsReader("com/configs/SqlMapConfig.xml");
     29             
     30             /*
     31              * 创建SqlMapClient接口的变量实例
     32              */
     33             sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader);
     34             
     35             /*
     36              * 关闭字符流
     37              */
     38             reader.close();
     39         }
     40         catch (Exception e)
     41         {
     42             e.printStackTrace();
     43         }
     44     }
     45     
     46     /*
     47      * 添加学生
     48      * @see com.dao.IStudentDao#addStudent(com.domain.Student)
     49      */
     50     public void addStudent(Student student)
     51     {
     52         try
     53         {
     54             sqlMapClient.insert("insertStudent", student);
     55         } catch (Exception e)
     56         {
     57             e.printStackTrace();
     58         }
     59     }
     60 
     61     /*
     62      * (non-Javadoc)
     63      * @see com.dao.IStudentDao#addStudentBySequence(com.domain.Student)
     64      */
     65     public void addStudentBySequence(Student student)
     66     {
     67         try
     68         {
     69             //1、从数据库获取主键值
     70             //2、向数据库插入数据
     71             sqlMapClient.insert("insertStudentBySequence", student);
     72         }
     73         catch (SQLException e)
     74         {
     75             // TODO Auto-generated catch block
     76             e.printStackTrace();
     77         }
     78     }
     79     
     80     /*
     81      * (non-Javadoc)
     82      * @see com.dao.IStudentDao#deleteStudentById(java.lang.Integer)
     83      */
     84     public void deleteStudentById(Integer id)
     85     {
     86         try
     87         {
     88             sqlMapClient.delete("deleteStudentById", id);
     89         } catch (Exception e)
     90         {
     91             e.printStackTrace();
     92         }
     93 
     94     }
     95 
     96     /*
     97      * (non-Javadoc)
     98      * @see com.dao.IStudentDao#updateStudentById(com.domain.Student)
     99      */
    100     public void updateStudentById(Student student)
    101     {
    102         try
    103         {
    104             System.out.println(sqlMapClient.update("updateStudentById", student));
    105         }
    106          catch (Exception e)
    107         {
    108             e.printStackTrace();
    109         }
    110     }
    111 
    112     /*
    113      * (non-Javadoc)
    114      * @see com.dao.IStudentDao#queryAllStudent()
    115      */
    116     @SuppressWarnings("unchecked")
    117     public List<Student> queryAllStudent()
    118     {
    119         List<Student> students  = null;
    120         try
    121         {
    122             students = sqlMapClient.queryForList("selectAllStudent");
    123         } catch (Exception e)
    124         {
    125             e.printStackTrace();
    126         }
    127         return students;
    128     }
    129 
    130     /*
    131      * (non-Javadoc)
    132      * @see com.dao.IStudentDao#queryStudentByName(java.lang.String)
    133      */
    134     @SuppressWarnings("unchecked")
    135     public List<Student> queryStudentByName(String name)
    136     {
    137         List<Student> students = null;
    138         try
    139         {
    140             students = sqlMapClient.queryForList("selectStudentByName", name);
    141         } 
    142         catch (Exception e)
    143         {
    144             e.printStackTrace();
    145         }
    146         return students;
    147     }
    148 
    149     /*
    150      * (non-Javadoc)
    151      * @see com.dao.IStudentDao#queryStudentById(java.lang.Integer)
    152      */
    153     public Student queryStudentById(Integer id)
    154     {
    155         Student student = null;
    156         try
    157         {
    158             student = (Student) sqlMapClient.queryForObject("selectStudentById", id);
    159         } catch (Exception e)
    160         {
    161             e.printStackTrace();
    162         }
    163         return student;
    164     }
    165 
    166 }

    好了,到此为止基本的配置文件和相关的类就写好了,接下来就是写一些测试了:

    
    
     1 package com.test;
     2 
     3 import java.sql.Date;
     4 
     5 import com.dao.IStudentDao;
     6 import com.dao.impl.IStudentDaoImpl;
     7 import com.domain.Student;
     8 
     9 public class TestDao
    10 {
    11     public static void main(String[] args)
    12     {
    13         IStudentDao iStudentDao = new IStudentDaoImpl();
    14         
    15     /*    System.out.println("*************查詢所有學生*************");
    16         for(Student student:iStudentDao.queryAllStudent())
    17         {
    18             System.out.println(student);
    19         }
    20         System.out.println();
    21         System.out.println("************根據id查詢************");
    22         System.out.println(iStudentDao.queryStudentById(2));
    23         
    24         System.out.println();
    25         System.out.println("***********插入记录*************");
    26         Student student = new Student();
    27         student.setSid(5);
    28         student.setSname("小wang");
    29         student.setBirthday(new Date(1992-04-19));
    30         student.setScore(89);
    31         iStudentDao.addStudent(student);
    32         System.out.println("end");
    33         
    34         System.out.println();
    35         System.out.println("***********删除记录*************");
    36         iStudentDao.deleteStudentById(5);*/
    37         
    38         /*System.out.println();
    39         System.out.println("***********修改记录*************");
    40         Student student1 = new Student();
    41         student1.setSid(5);
    42         student1.setSname("小wang231321");
    43         student1.setBirthday(new Date(1992-04-19));
    44         student1.setScore(89);
    45         iStudentDao.updateStudentById(student1);*/
    46         
    47         System.out.println();
    48         System.out.println("***********模糊查询记录*************");
    49         System.out.println(iStudentDao.queryStudentByName("w"));
    50     }
    51 }

    5、最后,对ibaits的一些优缺点总结:
      优点:(和jdbc相比较)
      (1)、减少了不少的代码量
      (2)、简单
      (3)、架构级性能增强
      (4)、sql语句与程序代码分离
      (5)、简化项目中的分工
      (6)、增强了移植性
     缺点:
      (1)、sql代码需要自己写
      (2)、参数数量只有一个

    注:此文原创。

    
    
    
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  • 原文地址:https://www.cnblogs.com/0519xf/p/4766642.html
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