iBATIS的多对多映射配置方法有哪些

小编给大家分享一下iBATIS的多对多映射配置方法有哪些，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！

iBATIS的多对多映射配置1，建表。数据库中三个表，分别为：

 CREATE TABLE [student] (   [id] [int] IDENTITY (1, 1) NOT NULL ,   [name] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NOT NULL ,   [birthday] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NOT NULL ,   CONSTRAINT [PK_student] PRIMARY KEY  CLUSTERED    (    [id]   )  ON [PRIMARY]   ) ON [PRIMARY]  GO  --------------------------------------------------  CREATE TABLE [teacher] (   [id] [int] IDENTITY (1, 1) NOT NULL ,   [name] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NOT NULL ,   [subject] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NOT NULL ,   CONSTRAINT [PK_teacher] PRIMARY KEY  CLUSTERED    (    [id]   )  ON [PRIMARY]   ) ON [PRIMARY]  GO  ---------------------------------------------------  CREATE TABLE [student_teacher] (   [studentid] [int] NOT NULL ,   [teacherid] [int] NOT NULL ,   CONSTRAINT [PK_student_teacher] PRIMARY KEY  CLUSTERED    (    [studentid],    [teacherid]   )  ON [PRIMARY]   ) ON [PRIMARY]  GO

iBATIS的多对多映射配置2，准备数据

insert into student(name,birthday) values('张三','1982-01-01')  insert into student(name,birthday) values('李四','1983-02-02')  insert into student(name,birthday) values('王五','1984-03-03')   insert into student(name,birthday) values('赵六','1985-04-04')  insert into teacher(name,subject) values('Jerry','语文')  insert into teacher(name,subject) values('Tom','数学')   insert into teacher(name,subject) values('Steven','英语')  insert into student_teacher(studentid,teacherid) values(1,1)  insert into student_teacher(studentid,teacherid) values(1,2)  insert into student_teacher(studentid,teacherid) values(2,1)  insert into student_teacher(studentid,teacherid) values(3,2)

iBATIS的多对多映射配置3，properties文件内容如下：

driver=com.microsoft.jdbc.sqlserver.SQLServerDriver   url=jdbc:microsoft:sqlserver://localhost:1433;SelectMethod=cursor;DatabaseName=ibatistest   username=sa   password=000

iBATIS的多对多映射配置4，总配置文件SqlMapConfig.xml内容如下：

﹤?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﹥    ﹤properties resource="com/lsm/cfg/jdbc.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/lsm/domain/Student.xml" /﹥   ﹤sqlMap resource="com/lsm/domain/Teacher.xml" /﹥   ﹤/sqlMapConfig﹥

iBATIS的多对多映射配置5，domain对象两个，Student 和 Teacher，如下：

Teacher.java

package com.lsm.domain;  import java.util.List;  public class Teacher  {   private int id;   private String name;   private String subject;   private List students; //注意这里有个List类型的students，表示一个老师对应多个学生      public List getStudents()   {    return students;   }   public void setStudents(List students)   {    this.students = students;   }   //省略掉其他的getter and setter  }   //Student.java  package com.lsm.domain;   import java.util.List;   public class Student  {   private int id;   private String name;   private String birthday;   private List teachers; //这里有一个list类型的teachers，表示一个学生有多个老师      public List getTeachers()   {    return teachers;   }   public void setTeachers(List teachers)   {    this.teachers = teachers;   }   //省略掉其他的getter and setter  }

iBATIS的多对多映射配置6，sqlmap配置文件

Teacher.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="teacher"﹥         ﹤typeAlias alias="Teacher" type="com.lsm.domain.Teacher" /﹥   ﹤typeAlias alias="Student" type="com.lsm.domain.Student" /﹥      ﹤resultMap class="Teacher" id="teacherBasicResultMap"﹥    ﹤result property="id" column="id"/﹥    ﹤result property="name" column="name"/﹥    ﹤result property="subject" column="subject"/﹥   ﹤/resultMap﹥   ﹤!-- 下面这个resultMap中有个students属性，这个结果映射继承自上面的结果映射    由于有了继承，结果映射可以任意扩展--﹥   ﹤resultMap class="Teacher" id="teacherWithTeacherResultMap" extends="teacherBasicResultMap"﹥    ﹤result property="students" column="id" select="getStudentsByTeacherId"/﹥   ﹤/resultMap﹥   ﹤!-- 这个查询中使用到了上面定义的结果映射，从而决定了查询出来的Teacher中关联出相关的students，在student.xml中配置相似，不再注释。--﹥   ﹤select id="getTeachers" resultMap="teacherWithTeacherResultMap"﹥    ﹤!--[CDATA[     select * from teacher    ]]﹥   ﹤/select﹥      ﹤select id="getStudentsByTeacherId" resultClass="Student"﹥    ﹤![CDATA[      select s.* from student s,student_teacher st where s.id=st.studentid and st.teacherid=#value#   ]]--﹥   ﹤/select﹥              ﹤/sqlMap﹥   tudent.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"﹥         ﹤typeAlias alias="Student" type="com.lsm.domain.Student" /﹥   ﹤typeAlias alias="Teacher" type="com.lsm.domain.Teacher" /﹥      ﹤resultMap class="Student" id="studentBasicResultMap"﹥    ﹤result property="id" column="id"/﹥    ﹤result property="name" column="name"/﹥    ﹤result property="birthday" column="birthday"/﹥   ﹤/resultMap﹥      ﹤resultMap class="Student" id="studentWithTeacherResultMap" extends="studentBasicResultMap"﹥    ﹤result property="teachers" column="id" select="getTeachersByStudentId"/﹥   ﹤/resultMap﹥      ﹤select id="getStudents" resultMap="studentWithTeacherResultMap"﹥    ﹤!--[CDATA[     select * from student    ]]﹥   ﹤/select﹥      ﹤select id="getTeachersByStudentId" resultClass="Teacher"﹥    ﹤![CDATA[      select t.* from teacher t,student_teacher st where t.id=st.teacherid and st.studentid=#value#   ]]--﹥   ﹤/select﹥              ﹤/sqlMap﹥

iBATIS的多对多映射配置7，测试

 package com.lsm.test;   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.lsm.domain.Student;  import com.lsm.domain.Teacher;   public class Many2Many  {    private static SqlMapClient sqlMapClient = null;   static  {    try   {     Reader reader = Resources.getResourceAsReader("com/lsm/cfg/SqlMapConfig.xml");     sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader);    }    catch(Exception e)    {     e.printStackTrace();    }   }   /**    * @param args    */  public static void main(String[] args)   {    Many2Many m2m = new Many2Many();    List studentlist = null;    studentlist = m2m.getStudentInfo();    for(int i=0;i﹤studentlist.size();i++)    {     Student s = new Student();     s = (Student) studentlist.get(i);     System.out.println("name:"+s.getName() + "\t" + "birthday:"+s.getBirthday());     List tlist = s.getTeachers();     if(tlist!=null)     {      System.out.println("his teachers as follows:");      {       for(int ti=0;ti﹤tlist.size();ti++)       {        Teacher t = new Teacher();        t = (Teacher) tlist.get(ti);        System.out.println("teacher name:" + t.getName());       }      }     }    }        List teacherlist = null;    teacherlist = m2m.getTeacherInfo();    for(int i=0;i﹤teacherlist.size();i++)    {     Teacher t = new Teacher();     t = (Teacher) teacherlist.get(i);     System.out.println("name:"+t.getName() + "\t" + "subject:" + t.getSubject());     List slist = t.getStudents();     if(slist!=null)     {      System.out.println("his students as follows:");      for(int si=0;si﹤slist.size();si++)      {       Student s = new Student();       s = (Student) slist.get(si);       System.out.println("student name:"+s.getName());      }     }    }   }      // 获取学生信息   public List getStudentInfo()   {    List studentList = null;    try   {     System.out.println("学生信息如下：");     studentList = sqlMapClient.queryForList("getStudents");    }    catch (SQLException e)    {     e.printStackTrace();    }    return studentList;   }      // 获取老师信息  //  获取学生信息   public List getTeacherInfo()   {    List studentList = null;    try   {     System.out.println("老师信息如下：");     studentList = sqlMapClient.queryForList("getTeachers");    }    catch (SQLException e)    {     e.printStackTrace();    }    return studentList;   }   }

8，输出

学生信息如下：  name:张三 birthday:1982-01-01  his teachers as follows:  teacher name:Jerry  teacher name:Tom  name:李四 birthday:1983-02-02  his teachers as follows:  teacher name:Jerry  name:王五 birthday:1984-03-03  his teachers as follows:  teacher name:Tom  name:赵六 birthday:1985-04-04  his teachers as follows:  老师信息如下：  name:Jerry subject:语文  his students as follows:  student name:张三  student name:李四  name:Tom subject:数学  his students as follows:  student name:张三  student name:王五  name:Steven subject:英语  his students as follows:

查询学生时带出老师信息，查询老师时带出学生信息，说明多对多映射成功。

以上是"iBATIS的多对多映射配置方法有哪些"这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注行业资讯频道！