Proxool是一个非常优秀的数据库连接池组件, 下面介绍如何在无spring容器的环境下让Mybatis调用Proxool管理的数据库连接.
首先,我们定义ProxoolUtils工具类,提供loadProxool方法加载数据库连接池．
package com.freestyle.common.db.proxool;
/***
* Proxool工具类
* @author dgmislrh
*/
import java.io.File;
import org.logicalcobwebs.proxool.ProxoolException;
import org.logicalcobwebs.proxool.configuration.JAXPConfigurator;
public class ProxoolUtils {
public ProxoolUtils() {
// TODO Auto-generated constructor stub
}
public static void loadProxool(String pvsProxoolConfigFilePath) throws ProxoolException{
try {
// 获取配置文件句柄
File file = new File(pvsProxoolConfigFilePath);
//单元测试未启动web service,所以要自已加载proxool configurator
JAXPConfigurator.configure(pvsProxoolConfigFilePath, false);
} catch (ProxoolException e) {
throw e;
}
}
public static void loadProxool() throws ProxoolException{
try {
// 获取配置文件句柄
String lvsPath=Class.class.getClass().getResource("/").getPath() ;
lvsPath=lvsPath+"../classes/proxool.xml";
loadProxool(lvsPath);
} catch (ProxoolException e) {
throw e;
}
}
}
再定义MybatisUtils工具类，用于sessionFactory的生成/session的获取及归还．
package com.freestyle.common.db.mybatis;
import java.io.IOException;
import java.io.InputStream;
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 org.apache.ibatis.transaction.TransactionFactory;
import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory;
import org.apache.log4j.Logger;
/****
* Mybatis工具类
*
* @author dgmislrh
*
*/
public class MybatisUtils {
private static final String CONFIG_FILE = "mybatis-config.xml";
private static final Logger logger = Logger.getLogger(MybatisUtils.class);
private static TransactionFactory transactionFactory = new JdbcTransactionFactory();
private static SqlSessionFactory sqlSessionFactory = null;
static {
buildSessionFactory();
}
public MybatisUtils() {
// TODO Auto-generated constructor stub
}
/**
* 获取SqlSession
*
* @return SqlSession
*/
public static SqlSession getSession() {
synchronized (logger) {
if (sqlSessionFactory == null) {
buildSessionFactory();
}
}
return sqlSessionFactory != null ? sqlSessionFactory.openSession() : null;
}
/**
* 关闭session
*/
public static void closeSession(SqlSession session) {
session.commit();
session.close();
}
public static TransactionFactory getTransactionFactory() {
return transactionFactory;
}
public static SqlSessionFactory getSessionFactory() {
synchronized (logger) {
if (sqlSessionFactory == null) {
buildSessionFactory();
}
}
return sqlSessionFactory;
}
private static void buildSessionFactory() {
if (sqlSessionFactory == null) {
InputStream inputStream = null;
try {
inputStream = Resources.getResourceAsStream(CONFIG_FILE);
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
// addMapper(sqlSessionFactory);
} catch (IOException e) {
logger.error("读取mybatis-config.xml文件时出现异常，异常信息：" + e.getMessage());
e.printStackTrace();
} catch (Exception e) {
logger.error("创建SessionFactory失败，异常信息：" + e.getMessage());
e.printStackTrace();
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
inputStream = null;
}
}
}
}
}
下面是src文件夹下的proxool.xml配置文件:
<?xml version="1.0" encoding="UTF-8"?>
<proxool>
<alias>omsdb</alias>
<!--
<driver-url>jdbc:postgresql://localhost:5432/omslivedbv2</driver-url>
-->
<driver-url>jdbc:postgresql://localhost:5432/omslivedbv2</driver-url>
<driver-class>org.postgresql.Driver</driver-class>
<driver-properties>
<property name="user" value="postgres" />
<property name="password" value="xxxxxxxx" />
</driver-properties>
<!--最少保持的空闲连接数(默认2个)-->
<prototype-count>2</prototype-count>
<minimum-connection-count>2</minimum-connection-count>
<maximum-connection-count>20</maximum-connection-count>
<!--没有空闲连接可以分配而在队列中等候的最大请求数,超过这个请求数的用户连接就不会被接受-->
<simultaneous-build-throttle>20</simultaneous-build-throttle>
<!--proxool自动侦察各个连接状态的时间间隔(毫秒),侦察到空闲的连接就马上回收,超时的销毁 默认30秒-->
<house-keeping-sleep-time>90000</house-keeping-sleep-time>
<!--在使用之前测试-->
<test-before-use>true</test-before-use>
<house-keeping-test-sql>select CURRENT_DATE</house-keeping-test-sql>
<maximum-active-time>6000000</maximum-active-time>
</proxool>
proxoolutils工具类会根据此配置文件加载proxool, 上面的配置用于创建postgresql数据库的连接.
下面是src文件夹下的mybatis-config.xml配置文件.
<?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>
<typeAliases>
<typeAlias type="com.freestyle.common.db.mybatis.OMSDataSourceFactory"
alias="omsdbFactory" />
</typeAliases>
<environments default="development">
<environment id="development"> <!-- 修改这里以后必须同步修改application.properties文件mybatis_environment属性的值 -->
<transactionManager type="JDBC" />
<dataSource type="omsdbFactory">
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="com/freestyle/proxoolmybatisstudy/dao/TaUserMapper.xml" />
</mappers>
</configuration>
上面的mybatis配置文件,development数据环境的dataSource的type指定为omsdbFactory, 这是自定义的DatasourceFactory,让mybatis根据omsdbFactory来产生datasource, 那么omsdbFactory又是什么? 它是OMSDataSourceFactory的简称, 而OMSDataSourceFactory是基于ProxoolDataSourceFactory的, 下面给出这两个类的代码:
package com.freestyle.common.db.proxool;
import java.util.Properties;
import javax.sql.DataSource;
import org.apache.ibatis.datasource.DataSourceFactory;
import org.logicalcobwebs.proxool.ProxoolDataSource;
/***
* ProxooolDataSource数据源工厂
* 调用前先加载proxool连接池
* @author dgmislrh
*
*/
public class ProxoolDataSourceFactory implements DataSourceFactory {
protected ProxoolDataSource dataSource=null;
public ProxoolDataSourceFactory(String pvsUrl) {
dataSource=new ProxoolDataSource(pvsUrl);
}
public DataSource getDataSource() {
return dataSource;
}
public void setProperties(Properties arg0) {
}
}
package com.freestyle.common.db.proxool;
/***
* 构建omsdb对应的数据源工厂
* @author dgmislrh
*
*/
public class OMSDataSourceFactory extends ProxoolDataSourceFactory {
public OMSDataSourceFactory(){
super("omsdb");
}
public OMSDataSourceFactory(String pvsUrl) {
super(pvsUrl);
// TODO Auto-generated constructor stub
}
}
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配置算是整好了, 为了省事,我们用Mybatis generator生成ta_user的mapper及代码 . 生成的代码都是千遍一律就不贴了.
下面开一个junit 测试:
package test;
import org.apache.ibatis.session.SqlSession;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.logicalcobwebs.proxool.ProxoolFacade;
import com.freestyle.common.db.mybatis.MybatisUtils;
import com.freestyle.common.db.proxool.ProxoolUtils;
import com.freestyle.proxoolmybatisstudy.dao.TaUserMapper;
import com.freestyle.proxoolmybatisstudy.entities.TaUser;
public class Test1 {
@Before
public void setUp() throws Exception {
//加载Proxool数据库连接池
ProxoolUtils.loadProxool();
}
@After
public void tearDown() throws Exception {
ProxoolFacade.shutdown(0);
}
@Test
public void test() {
SqlSession lvSqlSession=MybatisUtils.getSession();
try
{
TaUserMapper lvTaUerMapper=lvSqlSession.getMapper(TaUserMapper.class);
TaUser lvUser=lvTaUerMapper.selectByPrimaryKey("admin");
Assert.assertNotNull(lvUser);
lvUser.setFaPhone("8888");
lvTaUerMapper.updateByPrimaryKey(lvUser);
//lvSqlSession.rollback();
}
finally{
MybatisUtils.closeSession(lvSqlSession);
}
}
}
脱离spring的依赖, 用junit进行功能测试,启动速度非常快:
09:37:37,450 DEBUG selectByPrimaryKey:54 - ==> Preparing: select fa_login, fa_phone, fa_name, fa_status, fa_type, fa_create_by, fa_create_dt, fa_update_by, fa_update_dt, fa_email, fa_passwd, fa_remark, fa_staff_id, fa_last_notify from public.ta_user where fa_login = ? 09:37:37,455 DEBUG ProxyFactory:209 - Implementing interface java.sql.Statement 09:37:37,455 DEBUG ProxyFactory:209 - Implementing interface org.postgresql.PGStatement 09:37:37,456 DEBUG ProxyFactory:209 - Implementing interface java.sql.PreparedStatement 09:37:37,456 DEBUG ProxyFactory:209 - Implementing interface org.postgresql.core.BaseStatement 09:37:37,456 DEBUG ProxyFactory:209 - Implementing interface java.sql.Wrapper 09:37:37,456 DEBUG ProxyFactory:209 - Implementing interface java.lang.AutoCloseable 09:37:37,493 DEBUG selectByPrimaryKey:54 - ==> Parameters: admin(String) 09:37:37,515 DEBUG selectByPrimaryKey:54 - <== Total: 1 09:37:37,519 DEBUG ProxyFactory:209 - Implementing interface java.sql.DatabaseMetaData 09:37:37,519 DEBUG ProxyFactory:209 - Implementing interface java.sql.Wrapper com.freestyle.proxoolmybatisstudy.entities.TaUser@33f676f6 09:37:37,544 DEBUG updateByPrimaryKey:54 - ==> Preparing: update public.ta_user set fa_phone = ?, fa_name = ?, fa_status = ?, fa_type = ?, fa_create_by = ?, fa_create_dt = ?, fa_update_by = ?, fa_update_dt = ?, fa_email = ?, fa_passwd = ?, fa_remark = ?, fa_staff_id = ?, fa_last_notify = ? where fa_login = ? 09:37:37,547 DEBUG updateByPrimaryKey:54 - ==> Parameters: 8888(String), 管理员(String), A(String), A(String), test1(String), 2016-09-19 15:24:40.594(Timestamp), supuser1(String), 2016-10-14 15:47:35.312(Timestamp), (String), d1841df9a9ead353f339dd239a1b4676(String), (String), (String), 9711(Long), admin(String) 09:37:37,548 DEBUG updateByPrimaryKey:54 - <== Updates: 1 09:37:37,548 DEBUG JdbcTransaction:54 - Committing JDBC Connection [98826337(org.postgresql.jdbc.PgConnection@2fb0623e)] 09:37:37,551 DEBUG JdbcTransaction:54 - Resetting autocommit to true on JDBC Connection [98826337(org.postgresql.jdbc.PgConnection@2fb0623e)] 09:37:37,552 DEBUG JdbcTransaction:54 - Closing JDBC Connection [98826337(org.postgresql.jdbc.PgConnection@2fb0623e)]
代码下载： https://download.csdn.net/download/rocklee/10441780