整合的思路
SqlSessionFactory對象放到spring容器中作爲單例存在。
傳統dao的開發方式中，從spring容器中獲得sqlsession對象。
Mapper代理形式中，從spring容器中直接獲得mapper的代理對象。
數據庫的連接以及數據庫連接池事務管理都交給spring容器來完成。
整合需要的jar包
要實現spring與mybatis的整合，就要首先導入相關的依賴jar包，如下：
- Spring的jar包
- Mybatis的jar包
- Spring與mybatis整合的jar包
- Mysql數據庫驅動的jar包
- Druid數據庫連接池的jar包
- Spring與Junit集成測試的jar包(spring-test、Junit)
- 日誌的jar包
具體依賴
<properties> <spring-version>4.2.4.RELEASE</spring-version> </properties> <dependencies> <!-- spring 核心 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring-version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring-version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>${spring-version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-expression</artifactId> <version>${spring-version}</version> </dependency> <!-- spring web集成 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring-version}</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>provided</scope> </dependency> <!-- spring aop的jar包 --> <!-- https://mvnrepository.com/artifact/org.springframework/spring-aop --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${spring-version}</version> </dependency> <dependency> <groupId>aopalliance</groupId> <artifactId>aopalliance</artifactId> <version>1.0</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.6.8</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> <version>${spring-version}</version> </dependency> <!-- spring jdbc jar包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring-version}</version> </dependency> <!-- mysql驅動 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.38</version> </dependency> <!-- 事務 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring-version}</version> </dependency> <!-- druid數據庫連接池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.18</version> </dependency> <!-- mybaties的依賴包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.7</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.2.2</version> </dependency> <!-- 日誌相關的jar包 --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.13</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.5</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.16</version> </dependency> <!-- spring與Junit測試的jar包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring-version}</version> <scope>test</scope> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.9</version> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.7</source> <target>1.7</target> </configuration> </plugin> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <version>2.2</version> <configuration> <!-- 指定端口 --> <port>8080</port> <!-- 請求路徑 --> <path>/</path> </configuration> </plugin> </plugins> </build>
整合的步驟
第一步：創建maven的web工程
第二步：導入整合需要的jar包
第三步：mybatis的核心配置文件：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> <!-- 定義別名 --> <typeAliases> <package name="cn.itcast.spring.domain"/> </typeAliases> <!-- 加載映射文件 --> <mappers> <mapper resource="mapper.xml"/> </mappers> </configuration>
第四步：spring的核心配置文件：applicationContext.xml的配置
- 加載db.properties屬性配置文件
- 配置Druid數據庫連接池
- 將SqlSessionFactory的單例對象，配置到spring容器中
- 將mapper代理對象或者dao接口的實現類對象，配置到spring容器中
<?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:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd"> <context:component-scan base-package="cn.spring"></context:component-scan> <!-- 加載db.properties屬性文件 --> <context:property-placeholder location="classpath:db.properties"/> <!-- 數據庫連接池 --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <property name="driverClassName" value="${jdbc.driverClassName}"></property> <property name="url" value="${jdbc.url}"></property> <property name="username" value="${jdbc.username}"></property> <property name="password" value="${jdbc.password}"></property> </bean> <!-- SQLSessionFactory的配置 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"></property> <!-- mybatis的核心配置文件的路徑 --> <property name="configLocation" value="classpath:sqlMapConfig.xml"></property> </bean> </beans>
至於將mapper代理對象或者dao接口的實現類對象，配置到spring容器中，將在下面進行配置
第五步：編寫dao接口、dao實現類或者mapper接口、mapper映射文件
傳統Dao開發方式
開發方式：dao接口+dao實現類。
Dao的實現類需要從spring容器中獲取sqlSession對象來操作數據庫，spring爲我們提供了SqlsessionDaoSupport類，我們只需要繼承這個類，就可以順利的獲得sqlSession對象。
總結一句話：dao實現類需要繼承SqlsessionDaoSupport類，然後再spring容器中配置這個bean。
1 public interface AccountDao { 2 public List<Account> findAll(); 3 }
1 public class AccountDaoImpl extends SqlSessionDaoSupport implements AccountDao {//需要繼承SqlSessionDaoSupport 2 @Override 3 public List<Account> findAll() { 4 SqlSession sqlSession = getSqlSession(); //繼承SqlSessionDaoSupport 後直接調用getSqlSession方法 5 List<Account> selectList = sqlSession.selectList("test.abc"); 6 //整合後sqlSession不需要關閉 7 return selectList; 8 } 9 10 }
mapper.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="test"> <select id="abc" resultType="account"> select * from account </select> </mapper>
applicationContext.xml中配置dao
<!-- dao的實現類放到容器中（spring與mybatis整合傳統dao的開發） --> <bean id="accountDao" class="cn.itcast.spring.dao.AccountDaoImpl"> <property name="sqlSessionFactory" ref="sqlSessionFactory"></property> </bean>
基於mapper代理形式開發Dao
開發mapper接口及mapper映射文件
1 public interface AccountMapper { 2 public List<Account> selectAll(); 3 }
<?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代理的開發規則：
1.namespace必須爲接口的全路徑
2.id必須和接口的方法名稱一致
3.parameterType必須與接口方法的參數類型一致
4.resultType必須與接口方法的返回值類型一致
-->
<mapper namespace="cn.itcast.spring.mapper.AccountMapper"> <select id="selectAll" resultType="account"> select * from account </select> </mapper>
applicationContext.xml中配置mapper代理
<!-- 包掃描器 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 掃描包,mapper接口和映射對象的名稱必須保持一致 --> <property name="basePackage" value="cn.spring.mapper"></property> </bean>
第六步：編寫Junit測試代碼測試
傳統dao方式開發測試
1 @RunWith(SpringJUnit4ClassRunner.class) 2 @ContextConfiguration("classpath:applicationContext.xml") 3 public class SpringMybatisTest { 4 @Autowired 5 private AccountDao accountDao; 6 7 @Test 8 public void testName() throws Exception { 9 List<Account> findAll = accountDao.findAll(); 10 for (Account account : findAll) { 11 System.out.println(account); 12 } 13 } 14 }
基於mapper代理方式測試
1 @RunWith(SpringJUnit4ClassRunner.class) 2 @ContextConfiguration("classpath:applicationContext.xml") 3 public class SpringMybatisTest { 4 @Autowired 5 private AccountMapper accountMapper; 6 7 @Test 8 public void testName() throws Exception { 9 List<Account> list = accountMapper.selectAll(); 10 for (Account account : list) { 11 System.out.println(account); 12 } 13 } 14 }