最近在树莓派上部署了一套数据抓取工具,需要将抓取的数据录入到MySQL,特意找了下一些轻量级的ORM框架,这里简单介绍下DbUtils和OrmLite的配置和使用。
1. DbUtils
Apache旗下的,速度与稳定性不言而喻,但其配置还是有点啰嗦,依赖dbcp连接池。
地址:http://commons.apache.org/proper/commons-dbutils/
添加pom依赖:
<dependency> <groupId>commons-dbutils</groupId> <artifactId>commons-dbutils</artifactId> <version>1.6</version> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.4</version> </dependency>
添加dbcp.properties配置文件,放在classpath中:
driverClassName=com.mysql.jdbc.Driver url=jdbc:mysql://192.168.91.128:3306/db username=steven password=steven initialSize=10 maxActive=50 maxIdle=20 minIdle=5 maxWait=60000 #附带连接属性 connectionProperties=useUnicode=true;characterEncoding=utf8 #自动提交(auto-commit) defaultAutoCommit=true #只读(read-only) defaultReadOnly= #事务级别(TransactionIsolation) defaultTransactionIsolation=READ_COMMITTED
新增JdbcUtil.java来加载属性文件
package com.dorole.utils; import java.io.InputStream; import java.sql.SQLException; import java.util.Properties; import javax.sql.DataSource; import org.apache.commons.dbcp.BasicDataSourceFactory; import com.mysql.jdbc.Connection; public class JdbcUtil { private static DataSource ds; private static ThreadLocal<Connection> tl = new ThreadLocal<Connection>(); static { try { Properties prop = new Properties(); InputStream in = JdbcUtil.class.getClassLoader() .getResourceAsStream("dbcp.properties"); prop.load(in); ds = BasicDataSourceFactory.createDataSource(prop); } catch (Exception e) { throw new ExceptionInInitializerError(e); } } public static DataSource getDataSource() { return ds; } public static Connection getConnection() throws SQLException { try { Connection conn = tl.get(); if (conn == null) { conn = (Connection) ds.getConnection(); tl.set(conn); } return conn; } catch (Exception e) { throw new RuntimeException(e); } } }
插入数据:
QueryRunner runner = new QueryRunner(JdbcUtil.getDataSource()); String sql = "INSERT INTO `orders` (`storeName`, `telecomNumber`) VALUES (?, ?)"; Object params[] = { order.getStoreName(), order.getTelecomNumber(), }; try { runner.update(sql, params); } catch (SQLException e) { e.printStackTrace(); }
2. OrmLite
这个在Android上用的比较多,结合轻量级的数据库HSQLDB,非常适合嵌入式设备,但这里我们使用MySQL做演示,有意思的是连BaseDao都给封装好了,配置简单,易于使用。
地址:http://ormlite.com/
添加pom依赖:
<dependency> <groupId>com.j256.ormlite</groupId> <artifactId>ormlite-jdbc</artifactId> <version>4.9</version> </dependency>
新增OrderDao接口,默认的增删改查已经有了,故可以留空:
package com.dorole.dao; import com.dorole.model.Order; import com.j256.ormlite.dao.Dao; public interface OrderDao extends Dao<Order, Integer> { }
新增OrderDaoImpl实现类
package com.dorole.dao.impl; import java.sql.SQLException; import com.dorole.dao.OrderDao; import com.dorole.model.Order; import com.j256.ormlite.dao.BaseDaoImpl; import com.j256.ormlite.support.ConnectionSource; public class OrderDaoImpl extends BaseDaoImpl<Order, Integer> implements OrderDao { public OrderDaoImpl(ConnectionSource connectionSource, Class<Order> dataClass) throws SQLException { super(connectionSource, dataClass); } }
初始化:
OrderDao orderDao = null; ConnectionSource connectionSource; try { connectionSource = new JdbcConnectionSource( "jdbc:mysql://192.168.91.128:3306/db"); ((JdbcConnectionSource) connectionSource).setUsername("steven"); ((JdbcConnectionSource) connectionSource).setPassword("steven"); orderDao = new OrderDaoImpl(connectionSource, Order.class); } catch (SQLException e) { e.printStackTrace(); }
插入数据:
try { Order order = new Order(); orderDao.create(order); } catch (SQLException e) { e.printStackTrace(); }
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