MyBatis SqlSessionFactory的几种常见创建方式

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MyBatis框架主要是围绕着SqlSessionFactory这个类进行的，这个的创建过程如下：

定义一个Configuration对象，其中包含数据源、事务、mapper文件资源以及影响数据库行为属性设置settings
通过配置对象，则可以创建一个SqlSessionFactoryBuilder对象
通过 SqlSessionFactoryBuilder 获得SqlSessionFactory 的实例。
SqlSessionFactory 的实例可以获得操作数据的SqlSession实例，通过这个实例对数据库进行操作

具体看看SqlSessionFactory的创建

一、通过Configuration.xml配置文件进行创建

<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration><properties resource="ssm/jdbc.properties"></properties><environments default="development"><environment id="development"><transactionManager type="JDBC" /><dataSource type="POOLED"><property name="driver" value="${jdbc.driverClassName}"/><property name="url" value="${jdbc.url}"/><property name="username" value="${jdbc.username}"/><property name="password" value="${jdbc.password}"/></dataSource></environment></environments><mappers><mapper resource="ssm/BlogMapper.xml"/></mappers></configuration>

代码实现

package ssm;import java.io.IOException;import java.io.Reader;import org.apache.ibatis.io.Resources;import org.apache.ibatis.session.SqlSession;import org.apache.ibatis.session.SqlSessionFactory;import org.apache.ibatis.session.SqlSessionFactoryBuilder;import com.sm.model.User;public class GetSqlSessionFactoryFromXML {public static void main(String[] args) throws IOException {//配置文件的名称String resource = "ssm/configuration.xml";//通过Mybatis包中的Resources对象很轻松的获取到配置文件Reader reader = Resources.getResourceAsReader(resource);//通过SqlSessionFactoryBuilder创建SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);//获得session实例SqlSession session =sqlSessionFactory.openSession();User user = new User();user.setId(8);//完成数据库的插入session.insert("add", user);session.commit();session.close();System.out.println(sqlSessionFactory);}}

二、在程序中构建这些对象来创建

代码实现

package ssm;import java.sql.SQLException;import javax.sql.DataSource;import org.apache.ibatis.datasource.pooled.PooledDataSource;import org.apache.ibatis.mapping.Environment;import org.apache.ibatis.session.Configuration;import org.apache.ibatis.session.SqlSession;import org.apache.ibatis.session.SqlSessionFactory;import org.apache.ibatis.session.SqlSessionFactoryBuilder;import org.apache.ibatis.transaction.TransactionFactory;import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory;import com.sm.model.User;public class GetSqlSessionFactoryFromProgram {public static void main(String[] args) throws SQLException {String driver = "oracle.jdbc.OracleDriver";String url = "jdbc:oracle:thin:@localhost:1521:orcl";String username="scott";String password="tiger";//创建使用缓存池的数据源/*  * <dataSource type="POOLED"><property name="driver" value="${jdbc.driverClassName}"/><property name="url" value="${jdbc.url}"/><property name="username" value="${jdbc.username}"/><property name="password" value="${jdbc.password}"/></dataSource> */DataSource dataSource =new PooledDataSource(driver,url,username,password);//创建事务/* * <transactionManager type="JDBC" /> */TransactionFactory transactionFactory =  new JdbcTransactionFactory();Environment environment = new Environment("development", transactionFactory, dataSource);Configuration configuration = new Configuration(environment);//加入资源/* * <mapper resource="ssm/BlogMapper.xml"/> */configuration.addMapper(UserMapper.class);SqlSessionFactory sqlSessionFactory = new  SqlSessionFactoryBuilder().build(configuration);System.out.println(sqlSessionFactory);SqlSession session =  sqlSessionFactory.openSession();User user = new User();user.setId(6); session.insert("add", user); session.commit();session.close();}}

三、通过与Spring集成，由Spring容器管理创建

在spring的配置文件applicationContext.xml中配置

<bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">       <property name="dataSource" ref="dataSource" />       <property name="configLocation" value="classpath*:conf/configuration.xml" /></bean>

如果使用则直接注入，获取SqlSessionFactory实例即可。

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