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！
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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。
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