spring整合mybatis
目錄
1.在spring容器配置SqlSessionTemplate
前面我們學習到的框架都是但單獨使用,今天來看看sping整合mybatis框架,看它們是如何一起使用的!
一,項目相關知識點
要用到的相關組件:
MapperFactoryBean組件:封裝了根據Mapper映射器接口生成實現組件的功能, 自動生成Dao實現類。
MapperScannerConfigurer組件:封裝了批量生成Mapper組件的過程, 自動生成Dao實現類。
SqlSessionTemplate組件:自己編寫Dao接口,實現時可以簡化編程。
SqlSessionFactoryBean組件:封裝了創建SqlSessionFactory的過程。
要用到的包: Spring包,mybatis包,mybatis-spring相關包,數據庫驅動包,數據庫連接池包
搭建這個spring整合mybatis的web項目的結構如下圖:
二.開始搭建
1.新建項目
在eclispe中新建一個web項目,名稱爲:demo
2.引入相關包
在該項目的WEB-INF/lib目錄下,引入:
Spring包,spring5.0.8.release,這裏我把spring裏面的包全部引進去了。
MyBatis包,mybatis3.2.5.jar。
spring和mybatis相關包,mybatis-spring-1.2.2.jar。
數據庫驅動包,mysql-connector-java-5.1.39-bin.jar,這裏我們的數據庫時mysql。
數據庫連接池相關包:commons-collections4-4.0.jar、commons-dbcp-1.4.jar、commons-pool-1.6.jar。
如下圖:
3.編寫applicationContext.xml
在src目錄下編寫spring容器配置文件applicationContext.xml,目前該容器中沒有配置任何bean,代碼如下:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:util="http://www.springframework.org/schema/util" xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
</beans>
4.編寫實體類
我們要編寫與用戶表User對應的實體類,先看看這個表的結構,如下圖:
在src目錄下,新建com.cdd.entity包,在該包下新建實體類User,代碼如下:
package com.cdd.entity;
import java.io.Serializable;
public class User implements Serializable {
private Integer id; //用戶id
private String username; //登錄名稱
private String pwd; //密碼
private String name; //暱稱
private String gender; //性別:1-男,0-女
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public String toString() {
return "User [id=" + id + ", username=" + username + ", pwd=" + pwd + ", name=" + name + ", gender=" + gender
+ ", getId()=" + getId() + ", getUsername()=" + getUsername() + ", getPwd()=" + getPwd()
+ ", getName()=" + getName() + ", getGender()=" + getGender() + ", getClass()=" + getClass()
+ ", hashCode()=" + hashCode() + ", toString()=" + super.toString() + "]";
}
}
5.編寫sql定義文件
在com.cdd包下新建一個包sql,在com.cdd.sql包下新建對應這個實體類的sql定義文件UserMapper.xml,代碼如下:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"
"http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">
<mapper namespace="com.cdd.daoI.UserDaoI">
<!-- 根據用戶id查詢用戶信息 -->
<select id="findById" parameterType="int" resultType="com.cdd.entity.User">
select *
from user
where id=#{id}
</select>
</mapper>
注:<mapper>標籤的namespace的值:com.cdd.daoI.UserDaoI,要滿足接口映射器規則編寫接口。
6.編寫接口
在com.cdd包下新建包daoI,在com.cdd.daoI包下新建UserDaoI接口,並根據接口映射器規則編寫對應的方法,代碼如下:
package com.cdd.daoI;
import com.cdd.entity.User;
public interface UserDaoI {
public User findById(int id); //根據用戶id,查詢用戶信息
}
7.進行spring容器配置
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:util="http://www.springframework.org/schema/util" xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<!-- 配置數據庫連接池,即,數據源-->
<bean id="dbcp" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql://localhost:3306/jsd15077db?useUnicode=true&characterEncoding=utf-8"></property>
<property name="username" value="root"></property>
<property name="password" value="123456"></property>
</bean>
<!-- 配置SqlSessionFactory -->
<bean id="ssf" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dbcp"></property> <!-- 配置數據源 -->
<property name="mapperLocations" value="classpath:com/cdd/sql/*.xml"></property> <!-- 配置sql定義文件 -->
</bean>
<!-- 根據包路徑自動批量生成接口實現類dao -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.cdd.daoI"></property> <!-- 掃描該包下的接口,自動生成接口實現類dao -->
<!-- <property name="annotationClass" value="com.cdd.entity.mapDao"></property> --> <!-- 打上mapDao註解的接口才會自動生成其實現類 -->
</bean>
</beans>
8.測試
在com.cdd包下新建包test,在com.cdd.test包下新建類TestDemo,進行測試,代碼如下:
package com.cdd.test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.cdd.daoI.UserDaoI;
import com.cdd.entity.User;
public class TestDemo {
public static void main(String[] args){
String conf = "applicationContext.xml";
ApplicationContext ac = new ClassPathXmlApplicationContext(conf);
UserDaoI dao = ac.getBean("userDaoI", UserDaoI.class);
User user = dao.findById(3);
System.out.println(user);
}
}
運行,查看控制檯輸出(這裏能打印出用戶的詳細信息,是之前我再用戶實體類User中重寫了toString方法),如下圖:
附加:類似springJdbc
還有種方式類似於spring整合jdbc那樣,在Spring容器中註冊JdbcTemplate,然後在Dao裏把這個bean注入給該Dao的 jdbcTemplate屬性。
該方式是:在Spring容器中註冊SqlSessionTemplate(該bean要配置SqlSessionFactory,這裏用到的SqlSessionFactory用 到前面配置的ssf,這個ssf的配置同上)
1.在spring容器配置SqlSessionTemplate
在spring容器配置文件applicationContext.xml中添加配置,註冊SqlSessionTemplate的Bean,如下圖:
2.編寫dao
在com.cdd包下新建包dao,在com.cdd.dao包下新建類UserDao,代碼如下:
package com.cdd.dao;
import javax.annotation.Resource;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.stereotype.Repository;
import com.cdd.entity.User;
@Repository
public class UserDao {
@Resource
private SqlSessionTemplate sqlSessionTemplate; //把Spring容器中SqlSessionTemplate注入給這個屬性
public User findById(int id){
User user = sqlSessionTemplate.selectOne("findById",id);
return user;
}
}
3.測試
在com.cdd.test包先新建類TestDemo1,進行測試,代碼如下:
package com.cdd.test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.cdd.dao.UserDao;
import com.cdd.entity.User;
public class TestDemo1 {
public static void main(String[] args){
String conf = "applicationContext.xml";
ApplicationContext ac = new ClassPathXmlApplicationContext(conf);
UserDao userDao = ac.getBean("userDao", UserDao.class);
User user = userDao.findById(3);
System.out.println(user);
}
}
運行,查看控制檯輸出:
到這裏我們的spring整合mybaits就學習完了,終於整理完了,接下來要開始學些新的技術了。有什麼問題,還望大家不吝賜教!