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  • MyBatis SqlSessionFactory的几种常见创建方式

    原文链接:https://blog.csdn.net/jimolangge123/article/details/49228255

    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:

    1. 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
    2. 通过配置对象,则可以创建一个SqlSessionFactoryBuilder对象
    3. 通过 SqlSessionFactoryBuilder 获得SqlSessionFactory 的实例。
    4. 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
      1.配置文件:
    <!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>
    

    2.读取配置文件:

    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

    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

     1. 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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  • 原文地址:https://www.cnblogs.com/doudou-taste/p/9020816.html
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