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Java數(shù)據(jù)庫(kù)連接池之proxool_動(dòng)力節(jié)點(diǎn)Java學(xué)院整理

更新時(shí)間：2017年08月03日 10:14:54 投稿：mrr

Proxool是一種Java數(shù)據(jù)庫(kù)連接池技術(shù)。方便易用，便于發(fā)現(xiàn)連接泄漏的情況

Proxool是一種Java數(shù)據(jù)庫(kù)連接池技術(shù)。sourceforge下的一個(gè)開(kāi)源項(xiàng)目,這個(gè)項(xiàng)目提供一個(gè)健壯、易用的連接池，最為關(guān)鍵的是這個(gè)連接池提供監(jiān)控的功能，方便易用，便于發(fā)現(xiàn)連接泄漏的情況。

目前是和DBCP以及C3P0一起，最為常見(jiàn)的三種JDBC連接池技術(shù)。

日前，Hibernate官方宣布由于Bug太多不再支持DBCP，而推薦使用 Proxool或C3P0。

下面通過(guò)一個(gè)Demo說(shuō)明一下如何使用：

項(xiàng)目結(jié)構(gòu)如下：

DBLink.Java文件中的代碼：

package com.bjpowernode.util;  
import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.PreparedStatement; 
import java.sql.ResultSet; 
import java.sql.ResultSetMetaData; 
import java.sql.SQLException; 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
public class DBLink { 
  private Connection connection; 
  private PreparedStatement preparedStatement; 
  private ResultSet resultSet; 
  static{ 
    try { 
      Class.forName("org.logicalcobwebs.proxool.ProxoolDriver"); //加載驅(qū)動(dòng)  
    }catch (ClassNotFoundException e) { 
      System.out.println("加載驅(qū)動(dòng)失?。?); 
      e.printStackTrace(); 
    } 
  } 
  private Connection getConn(){ 
    try { 
      if(connection==null||connection.isClosed()){ 
        connection = DriverManager.getConnection("proxool.mysqlsource");  //獲取連接  
      } 
    } catch (SQLException e) { 
      System.out.println("獲取連接失??！"); 
      e.printStackTrace(); 
    } 
    return connection; 
  } 
  public List<Map<String, Object>> select(String sql, Object [] params){ 
    List<Map<String, Object>> list = new ArrayList<Map<String, Object>>(); 
    try{ 
      connection = this.getConn(); 
      preparedStatement = connection.prepareStatement(sql); 
      if(params != null){ 
        for(int i =0; i<params.length; i++){ 
          preparedStatement.setObject(i+1, params[i]);//逐一給問(wèn)號(hào)賦值 
        } 
      } 
      resultSet = preparedStatement.executeQuery(); 
      ResultSetMetaData rsmd = resultSet.getMetaData(); 
      int columnCount = rsmd.getColumnCount(); 
      while(resultSet.next()){ 
        Map<String, Object> map = new HashMap<String, Object>(); 
        for(int i =1; i<=columnCount;i++){ 
          String columnName = rsmd.getColumnName(i); 
          Object obj = null; 
          if(rsmd.getColumnTypeName(i).equals("DATE")){ 
            obj = resultSet.getString(columnName); 
          }else{ 
            obj = resultSet.getObject(columnName); 
          } 
          map.put(columnName, obj); 
        } 
        list.add(map); 
      } 
    }catch(SQLException e){ 
      e.printStackTrace(); 
    }finally{ 
      close(); 
    } 
    return list; 
  } 
  private void close(){ 
    try { 
      if(resultSet != null){ 
        resultSet.close(); 
      } 
    } catch (SQLException e) { 
      e.printStackTrace(); 
    } 
    try { 
      if(preparedStatement != null){ 
        preparedStatement.close(); 
      } 
    } catch (SQLException e) { 
      e.printStackTrace(); 
    } 
    try { 
      connection.close(); 
    } catch (SQLException e) { 
      e.printStackTrace(); 
    } 
  } 
}

proxool.xml文件中的代碼：

<?xml version="1.0" encoding="UTF-8"?> 
<proxool-config> 
  <proxool> 
    <alias>mysqlsource</alias> 
    <driver-url>jdbc:mysql://localhost:3306/test</driver-url> 
    <driver-class>com.mysql.jdbc.Driver</driver-class> 
    <driver-properties> 
      <property name="user" value="root" /> 
      <property name="password" value="root" /> 
    </driver-properties> 
    <!-- 保留線程處于睡眠狀態(tài)的最長(zhǎng)時(shí)間 --> 
    <house-keeping-sleep-time>60000</house-keeping-sleep-time> 
    <maximum-connection-count>30</maximum-connection-count> 
    <minimum-connection-count>10</minimum-connection-count> 
    <!-- 連接池中可用的連接數(shù)量（空閑狀態(tài)） --> 
    <prototype-count>5</prototype-count> 
    <maximum-new-connections>1</maximum-new-connections> 
    <simultaneous-build-throttle>1</simultaneous-build-throttle> 
    <!-- 連接池使用狀態(tài) --> 
    <statistics>30s,10m,1d</statistics> 
    <!-- 連接池日志類型 --> 
    <statistics-log-level>ERROR</statistics-log-level> 
    <!-- 如果為true,那么每個(gè)被執(zhí)行的SQL語(yǔ)句將會(huì)在執(zhí)行期被log記錄(DEBUG LEVEL) --> 
    <trace>true</trace> 
    <house-keeping-test-sql>select CURRENT_DATE</house-keeping-test-sql> 
  </proxool> 
</proxool-config>

web.xml文件中的代碼：

<?xml version="1.0" encoding="UTF-8"?> 
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
  http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> 
 
  <!-- 連接池 --> 
  <servlet> 
    <servlet-name>ServletConfigurator</servlet-name> 
    <servlet-class>org.logicalcobwebs.proxool.configuration.ServletConfigurator</servlet-class> 
    <init-param> 
      <param-name>xmlFile</param-name> 
      <param-value>WEB-INF/proxool.xml</param-value> 
    </init-param> 
    <load-on-startup>1</load-on-startup> 
  </servlet> 
   
  <welcome-file-list> 
    <welcome-file>index.jsp</welcome-file> 
  </welcome-file-list> 
</web-app>

index.jsp文件中的代碼：

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> 
<%@page import="com.bjpowernode.util.DBLink,java.util.List,java.util.Map"%> 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 
<html> 
  <head> 
    <title>首頁(yè)</title> 
  </head> 
 
  <body> 
    <table width="100%" border="1px"> 
      <tr> 
        <th>序號(hào)  </th><th>班級(jí)名稱</th><th>開(kāi)班日期</th><th>結(jié)束日期</th><th>狀態(tài)</th><th>操作</th> 
      </tr> 
      <% 
        String sql = "SELECT id, class_name, begin_date, end_date, state FROM class "; 
        DBLink db = new DBLink(); 
        List<Map<String, Object>> list = db.select(sql, null); 
        int index = 0; 
        for (Map<String, Object> map : list) { 
          index = index + 1; 
          int id = Integer.parseInt(map.get("id").toString()); 
          String className = map.get("class_name").toString(); 
          String beginDate = map.get("begin_date").toString(); 
          String endDate = map.get("end_date").toString(); 
          int state = Integer.parseInt(map.get("state").toString()); 
          String stateName = (state == 0 ? "未啟用" : "啟用"); 
      %> 
      <tr align="center"> 
        <td><%=index%></td><td><%=className%></td><td><%=beginDate%></td><td><%=endDate%></td><td><%=stateName%></td><td>【<a href="###" rel="external nofollow" rel="external nofollow" rel="external nofollow" onclick="">修改</a>】【<a href="###" rel="external nofollow" rel="external nofollow" rel="external nofollow" onclick="">查看</a>】【<a href="###" rel="external nofollow" rel="external nofollow" rel="external nofollow" onclick="">刪除</a>】</td> 
      </tr> 
      <% 
        } 
      %> 
    </table> 
  </body> 
</html>

總結(jié)

以上所述是小編給大家介紹的Java數(shù)據(jù)庫(kù)連接池之proxool，希望對(duì)大家有所幫助，如果大家有任何疑問(wèn)請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持！

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