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：
- 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
1.配置文件：
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<!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：
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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
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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
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<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。
