Spring整合iBatis之二：从iBatis角度看两框架整合

    总的来说，iBatis功能上基本不变、结构不变， iBatis的VO（也就是model）不变，配置文件数量和作用基本上不变。

    

    有变化的地方：

    1. 在DAO的实现上（DAOImpl）不用过SqlMapClient执行SQL语句，改用spring提供的SqlMapClientTemplate

    2.SqlMapConfig.xml中，数据库的配置不再由iBatis处理，交给spring的配置文件统一管理

    3.事务处理完全交给spring

一：需要修改的文件

1：StudentDAOImpl.java

StudentDAOImpl除了要继承IDAO接口，还要继承与spring提供的SqlMapClientDaoSupport，

之后，不用再手动从配置文件加载配置，交给spring注入iBatis配置

执行上都用类似getSqlMapClientTemplate().insert("Stu_namespace.insertStudent",stu);的方法执行

package com.rt.sidemo.dao;

import java.util.List;
import com.rt.sidemo.model.Student;
import org.springframework.orm.ibatis.support.SqlMapClientDaoSupport;//spring支持iBatis的包

public class StudentDAOImpl extends SqlMapClientDaoSupport implements IStudentDAO
{
/*这儿不用手动初始化了，等着spring注入完直接用
* spring会往service里，注入一个带dataSource和ibatis配置的dao
*
private static SqlMapClient smc = null;//SqlMapClient带有很多增删改查的方法
static//静态初始化一次就够了
{
try {
Reader reader = com.ibatis.common.resources.Resources.getResourceAsReader("SqlMapConfig.xml");//借助Reader读入xml配置，注意位置
smc = com.ibatis.sqlmap.client.SqlMapClientBuilder.buildSqlMapClient(reader);
reader.close();//不再需要Reader了，关之
} catch (IOException e) {
e.printStackTrace();
}
}
*/

//重写的方法中，用SqlMapClient的地方都换成getSqlMapClientTemplate()
@Override
public void addStudent(Student stu) {
getSqlMapClientTemplate().insert("Stu_namespace.insertStudent",stu);
System.out.println("插入时返回的对象=》"+stu.getStudentid());//打印返回的值
}

@Override
public void addStudentBySequence(Student stu) {
getSqlMapClientTemplate().insert("Stu_namespace.insertStudentBySequence",stu);
System.out.println("插入时返回的对象=》"+stu.getStudentid());//打印返回的值

}

@Override
public void delStudentById(int id) {
int deletedCount = 0;
deletedCount = getSqlMapClientTemplate().delete("Stu_namespace.deleteStudentById",id);
System.out.println("deleteCount=>"+deletedCount);
}

@Override
public void updateStudent(Student stu) {
int updatedCount = 0;
updatedCount = getSqlMapClientTemplate().update("Stu_namespace.updateStudent", stu);
System.out.println("updatedCount=>"+updatedCount);
}

@Override
public Student selectStudentById(int id) {
Student stu = null;
stu =(Student) getSqlMapClientTemplate().queryForObject("Stu_namespace.selectStudentById",id);
return stu;
}

@Override
public List<Student> selectStudentByName(String name) {
List<Student> stus = null;
stus =getSqlMapClientTemplate().queryForList("Stu_namespace.selectStudentByName",name);
return stus;
}

@Override
public List<Student> selectAll() {
List<Student> stus = null;
stus =getSqlMapClientTemplate().queryForList("Stu_namespace.selectAllStudent");
return stus;
}

}

2：sqlMapConfig.xml

datasource不用管了，事务处理完全委托给spring

等于只负责命名空间和具体映射

<?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>

<!-- iBatis的命名空间，整合后仍然归此文件管 -->
<!-- 但是dataSource配置归spring管了 -->
<settings useStatementNamespaces="true"/>

<!-- 数据库配置都交给applicationContext-common.xml文件管理了
<transactionManager type="JDBC">
<dataSource type="SIMPLE">
<property name="JDBC.Driver" value="oracle.jdbc.driver.OracleDriver"/>
<property name="JDBC.ConnectionURL" value="jdbc:oracle:thin:@localhost:1521:ORCL"/>
<property name="JDBC.Username" value="scott"/>
<property name="JDBC.Password" value="890307"/>
</dataSource>
</transactionManager>
-->

<!-- 各个表和类对应的配置，这个不变 -->
<!-- 具体的配置，也不变，还用ibatis原来的配置 -->
<sqlMap resource="Student.xml"/>
<!-- List more here...
<sqlMap resource="com/mydomain/data/Order.xml"/>
<sqlMap resource="com/mydomain/data/Documents.xml"/>
-->

</sqlMapConfig>

二：不用修改的文件：

1.IStudentDAO.java

package com.rt.sidemo.dao;

import java.util.List;
import com.rt.sidemo.model.Student;

public interface IStudentDAO
{
//增
public void addStudent(Student stu);
public void addStudentBySequence(Student stu);//主键序列自增
//删
public void delStudentById(int id);
//改
public void updateStudent(Student stu);

//查
public Student selectStudentById(int id);
public List<Student> selectStudentByName(String name);//用name模糊查询
public List<Student> selectAll();//查寻全部
}

2.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">

<!-- 和spring整合后也不用改 -->
<sqlMap namespace="Stu_namespace">

<!-- 别名，起别名以后class里就不用每次都写包了 -->
<typeAlias alias="Student" type="com.rt.sidemo.model.Student"/>

<!-- Result maps describe the mapping between the columns returned
from a query, and the class properties.  A result map isn't
necessary if the columns (or aliases) match to the properties
exactly.-->
<resultMap id="StudentResult" class="Student">
<result property="studentid" column="studentid"/>
<result property="name" column="name"/>
<result property="age" column="age"/>
</resultMap>

<!-- 1.查找全部，官方推荐用resultMap，暂时用简单的resultClass代替 -->
<select id="selectAllStudent" resultClass="Student">
SELECT *
FROM Student
</select>

<!-- 2.查询主键，多了一个接收参数的类型parameterClass，这里井号中是占位符 -->
<select id="selectStudentById" parameterClass="int" resultClass="Student">
SELECT
studentid,
name,
age
FROM student
WHERE studentid = #id#
</select>

<!-- 3.模糊查找，占位符必须用$ -->
<select id="selectStudentByName" parameterClass="String" resultClass="Student">
SELECT
studentid,
name,
age
FROM student
WHERE name LIKE '%$name$%'
</select>

<!-- 4.删除操作 -->
<delete id="deleteStudentById" parameterClass="int">
DELETE FROM student WHERE studentid = #studentid#
</delete>

<!-- 5.增加指定 -->
<insert id="insertStudent" parameterClass="Student">
INSERT into Student (studentid,name,age)
VALUES  (#studentid#, #name#, #age#)
</insert>

<!-- 6.序列增长,要指定自增长的主键字段名 -->
<!-- selectKey相当于查询一次，把int类型的结果赋值给：传参的studentid： -->
<insert id="insertStudentBySequence" parameterClass="Student">
<selectKey resultClass="int" keyProperty="studentid">
SELECT studentPKSequence.nextVal AS studentid
FROM dual
</selectKey>

INSERT into Student (studentid,name,age)
VALUES  (#studentid#, #name#, #age#)
</insert>

<!-- 7.按主键更新 -->
<update id="updateStudent" parameterClass="Student">
update Student set
studentid = #studentid#,
name = #name#,
age = #age#
where
studentid = #studentid#
</update>

</sqlMap>

3.Student.java

package com.rt.sidemo.model;

public class Student
{
private int studentid;
private String name;
private int age;

public String toString()
{
return " id=>"+studentid+" name=>"+name+" age=>"+age;
}

//setter&getter
public int getStudentid() {
return studentid;
}
public void setStudentid(int studentid) {
this.studentid = studentid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}

}

补个文件结构：