MyBatis（9）整合spring
阿新 • • 發佈：2018-12-17
具體的感興趣可以參考：MyBatis
此時此刻，沒用的話不再多說了，直接開始程式碼工程吧！
整體的程式碼實現：
具體使用到的我們在進行細說
基本上理解一邊就能會使用整合
準備工作：
db.properties
jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3307/shopping jdbc.username=root jdbc.password=12345
log4j.properties
#Global logging configuration # 在開發環境下日誌級別要設成 log4j.rootLoggerapplivationContext.xml mvc,context,aop,tx,beans...命名約束= DEBUG, stdout # Console output... log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout = org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern =%5p [%t] - %m%n
<!-- 載入配置檔案 -->
<context:property-placeholder location="classpath:db.properties" />使用dbcp資料庫連線池
<!-- 資料來源，使用dbcp -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<property name="maxActive" value="10" />
<property name="maxIdle" value="5" />
</bean>不需要在類中單獨進行配置
<!-- sqlSessinFactory -->
<!-- org.mybatis.spring.SqlSessionFactoryBean -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 載入mybatis的配置檔案 -->
<property name="configLocation" value="mybatis/SqlMapConfig.xml" />
<!-- 資料來源 -->
<property name="dataSource" ref="dataSource" />
</bean>
SqlMapConfig.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <typeAliases> <package name="com.MrChengs.po"/> </typeAliases> <!-- 載入 對映檔案 --> <mappers> <mapper resource="sqlmap/User.xml"/> </mappers> </configuration>
其他的設定項在使用的時候在進行新增,,,,,,
一.dao開發
Userser.xml
簡單的小案例進行測試，其餘的程式碼和之前的方法一樣
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="test"> <select id="findUserByID" parameterType="int" resultType="com.MrChengs.po.User"> select * from user where id=#{id} </select> </mapper>
UserDao.java
public interface UserDao { //根據id查詢使用者資訊 public User findUserById(int id) throws Exception; }
UserDaoImp.java
讓實現介面類的類繼承SqlSessionDaoSupport 通過spring進行注入，宣告配置方式，配置dao的bean 此時不需要手動配置SqlSessionFactory 直接可以得到其物件 此時不需要手動關閉，在spring容器池裡會自動關閉public class UserDaoImp extends SqlSessionDaoSupport implements UserDao { @Override public User findUserById(int id) throws Exception { SqlSession sqlSession = this.getSqlSession(); User user =sqlSession.selectOne("test.findUserByID", id); return user; } }applivationContext.xml 注入sqlSessionFactory
<bean id="userDao" class="com.MrChengs.UserDao.UserDaoImp">
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>
測試：
public class Test { private ApplicationContext applicationContext; public ApplicationContext getApplication(){ applicationContext = new ClassPathXmlApplicationContext("classpath:spring/applicationContext.xml"); return applicationContext; } //Dao開發 @org.junit.Test public void testDao() throws Exception{ UserDao userdao = (UserDao) getApplication().getBean("userDao"); User user = userdao.findUserById(1); System.out.println(user); } }
DEBUG [main] - ==> Preparing: select * from user where id=? DEBUG [main] - ==> Parameters: 1(Integer) DEBUG [main] - <== Total: 1 DEBUG [main] - Closing non transactional SqlSession [[email protected]] DEBUG [main] - Returning JDBC Connection to DataSource User [id=1, username=王五, birthday=null, sex=2, address=null]
二.Mapper代理開發
UserMapper.java
//相當於dao介面 public interface UserMapper { //根據id查詢使用者資訊 public User findUserById(int id) throws Exception; }
UserMapper.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.MrChengs.mapper.UserMapper"> <select id="findUserById" parameterType="int" resultType="com.MrChengs.po.User"> SELECT * FROM USER WHERE id=#{value} </select> </mapper>
注意上述的兩個檔案在一個路徑下。
SqlMapConfig.xml
<!-- 載入 對映檔案 -->
<mappers>
<mapper resource="sqlmap/User.xml"/>
<package name="com.MrChengs.mapper"/>
</mappers>
通過MapperFactoryBean建立代理物件
<!-- mapper配置 MapperFactoryBean：根據mapper介面生成代理物件 --> <!-- mapperInterface指定mapper介面 --> <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean"> <property name="mapperInterface" value="com.MrChengs.mapper.UserMapper"/> <property name="sqlSessionFactory" ref="sqlSessionFactory"/> </bean>
測試：
public class TestMapper { private ApplicationContext applicationContext; public ApplicationContext getApplication(){ applicationContext = new ClassPathXmlApplicationContext("classpath:spring/applicationContext.xml"); return applicationContext; } //Mapper開發 @org.junit.Test public void testmapper() throws Exception{ UserMapper user = (UserMapper) getApplication().getBean("userMapper"); User u = user.findUserById(1); System.out.println(u); } }
DEBUG [main] - ==> Preparing: SELECT * FROM USER WHERE id=? DEBUG [main] - ==> Parameters: 1(Integer) DEBUG [main] - <== Total: 1 DEBUG [main] - Closing non transactional SqlSession [[email protected]] DEBUG [main] - Returning JDBC Connection to DataSource User [id=1, username=王五, birthday=null, sex=2, address=null]
如果有很多個類都需要對每個mapper進行配置，此時需要大量的工程???
<bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean"> <property name="mapperInterface" value="com.MrChengs.mapper.UserMapper"/> <property name="sqlSessionFactory" ref="sqlSessionFactory"/> </bean> 。。。。。
通過MapperScannerConfigurer進行mapper掃描（建議使用）
applicationContext.xml
說明：
mapper批量掃描，從mapper包中掃描出mapper介面，自動建立代理物件並且在spring容器中註冊 遵循規範：將mapper.java和mapper.xml對映檔名稱保持一致，且在一個目錄 中 自動掃描出來的mapper的bean的id為mapper類名（首字母小寫）name="basePackage"
指定掃描的包名
如果掃描多個包，每個包中間使用半形逗號分隔
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.MrChengs.mapper"/>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
其餘的測試不變......
