Mybatis 和Spring整合之原始dao開發
阿新 • • 發佈:2018-01-15
package settings 定義 int inter 實現 frame port tor
F:\Aziliao\mybatis\代碼\31.mybatis與spring整合-開發原始dao
1.1. 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> <!-- 通過setting配置mybatis的運行參數 註意,設置運行參數會影響 mybatis的運行,一定要註意!--> <settings> <!-- 延遲加載的總開關 --> <setting name="lazyLoadingEnabled" value="true"/> <!-- 設置為false實現按需求加載 --> <setting name="aggressiveLazyLoading" value="false"/> <!-- 開啟二級緩存 --> <setting name="cacheEnabled" value="true"/> </settings> <!-- 定義別名 --> <typeAliases> <!-- 單個別名定義 type:類路徑 alias:別名--> <!-- <typeAlias type="cn.itcast.mybatis.po.User" alias="user"/> --> <!-- 批量配置 指定pojo所在包路徑,自動掃描包下的pojo定義別名,別名為類名(首字母小寫或大寫都可以) --> <package name="cn.itcast.mybatis.po"/> <!-- 如果掃描多個包中的pojo,就寫多個 package--> <!-- <packagename=""/> --> </typeAliases> <!-- 加載mapper.xml --> <mappers> <!-- 指定classpath下的映射文件 --> <mapper resource="sqlmap/User.xml" /> <!-- <mapper resource="mapper/UserMapper.xml" /> --> <!-- 通過mapper.java進行加載映射 class指定mapper接口 的路徑 要求:mapper.java文件和mapper.xml同名且在同一個目錄 --> <!-- <mapper class="cn.itcast.mybatis.mapper.UserMapper"/> --> <!-- 包掃描方式 指定mapper接口所在包,自動掃描mapper接口進行加載 要求:mapper.java文件和mapper.xml同名且在同一個目錄 --> <package name="cn.itcast.mybatis.mapper"/> </mappers> </configuration>
db.properties
jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/mybatis jdbc.username=root jdbc.password=123
log4j.properties
# Global logging configuration #\u5728\u5f00\u53d1\u9636\u6bb5\uff0c\u8bbe\u7f6e\u4e3aDEBUG\uff0c\u5230\u751f\u4ea7\u73af\u5883\u4e0a\u8bbe\u7f6einfo\u6216error\u5c31\u884c\u4e86\u3002 log4j.rootLogger=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
1.2 在spring容器中配置sqlSessionFactory applicationContext.xml
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-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/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd "> <!-- 配置數據源dataSource --> <!-- 加載配置文件 --> <context:property-placeholder location="classpath:db.properties"/> <!-- 數據庫連接池 --> <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> <!-- 配置sqlSessionFactory --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 配置數據源 --> <property name="dataSource" ref="dataSource"/> <!-- 加載mybatis的配置文件 --> <property name="configLocation" value="classpath:SqlMapConfig.xml"/> </bean> <!-- 原始dao --> <bean id="userDao" class="cn.itcast.mybatis.dao.UserDaoImpl"> <property name="sqlSessionFactory" ref="sqlSessionFactory"/> </bean> </beans>
1.3 Dao接口實現類繼承SqlSessionDaoSupport
public interface UserDao { //根據用戶id查詢用戶信息 public User findUserById(int id)throws Exception; //根據用戶名稱模糊查詢 public List<User> findUserByName(String name)throws Exception; //添加用戶 public void insertUser(User user) throws Exception; }
public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao { //由於繼承SqlSessionDaoSupport所以這裏不用再添加setSqlSessionFacotry方法了。 @Override public User findUserById(int id) throws Exception { // Sqlsession定義為局部變量 SqlSession sqlSession = this.getSqlSession(); User user = sqlSession.selectOne("test.findUserById", id); return user; } @Override public List<User> findUserByName(String name) throws Exception { // Sqlsession定義為局部變量 SqlSession sqlSession = this.getSqlSession(); List<User> list = sqlSession.selectList("test.findUserByName", "張"); return list; } @Override public void insertUser(User user) throws Exception { // Sqlsession定義為局部變量 SqlSession sqlSession = this.getSqlSession(); sqlSession.insert("test.insertUser", user); } }
1.4在spring容器中配置dao
1.15 從spring容器取出dao實例進行測試
public class UserDaoImplTest { private ApplicationContext applicationContext; @Before public void setUp() throws Exception { //取出spring的容器 applicationContext = new ClassPathXmlApplicationContext("classpath:applicationContext.xml"); } @Test public void testFindUserById() throws Exception { //從容器中取出dao UserDao userDao = (UserDao) applicationContext.getBean("userDao"); //調用dao的方法 User user = userDao.findUserById(1); System.out.println(user); } }
Mybatis 和Spring整合之原始dao開發