JDBC連接池

application.properties

jdbc.driver=oracle.jdbc.driver.OracleDriver
jdbc.url=jdbc:oracle:thin:@192.168.1.241:1521:orcl
jdbc.username=im
jdbc.password=im

 

 

ConnectionFactory.java

import java.beans.PropertyVetoException;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Map;

import com.mchange.v2.c3p0.ComboPooledDataSource;
import com.targsoft.webim.util.ReadProperties;
  
public class ConnectionFactory {   
  
    private ConnectionFactory(){   
    }       
  
    private static ComboPooledDataSource ds = null;   
  
    static {   
        try {
        	Map<String,String> map = new ReadProperties().readFile(Thread.currentThread().getContextClassLoader().getResource("").getPath()+"application.properties") ;
    		String driverName = map.get("jdbc.driver") ;
    		String dbURL = map.get("jdbc.url") ;
    		String userName = map.get("jdbc.username") ;
    		String userPwd = map.get("jdbc.password") ;
            ds = new ComboPooledDataSource();   // 設置JDBC的Driver類   
            ds.setDriverClass(driverName);  // 參數由 Config 類根據配置文件讀取   
            ds.setJdbcUrl(dbURL);    // 設置JDBC的URL   
            ds.setUser(userName);   // 設置數據庫的登錄用戶名   
            ds.setPassword(userPwd);  // 設置數據庫的登錄用戶密碼   
            ds.setMaxPoolSize(200);   // 設置連接池的最大連接數    
            ds.setMinPoolSize(20); // 設置連接池的最小連接數     
        } catch (PropertyVetoException e) {   
            e.printStackTrace();   
        }   
    }   
    
    public static synchronized Connection getConnection() {   
        Connection con = null;   
        try {   
            con = ds.getConnection();   
        } catch (SQLException e1) {   
            e1.printStackTrace();   
        }   
        return con;   
    }   
}  

 

 

TestCaseC3P0.java

import java.sql.Connection;   
import java.sql.PreparedStatement;   
import java.sql.ResultSet;   
import java.sql.SQLException;   
  
public class TestCaseC3P0{   
  public static void main(String[] args) {   
  
  PreparedStatement pstmt = null;   // 聲明一個數據庫操作對象   
  ResultSet rs = null;   // 聲明一個結果集對象   
  String sql = null;   // 聲明一個SQL變量，用於保存SQL語句
  Connection con = null;   // DataBaseConnection爲具體的數據庫連接及關閉操作類   
  con = ConnectionFactory.getConnection();   // 連接數據庫 
  
  sql = "SELECT a.uuid FROM im_account a ";   // 編寫SQL語句   
  try {   
   pstmt = con.prepareStatement(sql);   
   rs = pstmt.executeQuery();   
   if (rs.next()) {   
   }   
   // 依次關閉   
   rs.close();   
   pstmt.close();   
  } catch (Exception e) {   
   System.out.println(e);   
  } finally {   
   // 最後一定要保證數據庫已被關閉   
   try {   
    con.close();   
   } catch (SQLException e) {   
    e.printStackTrace();   
   }   
  }   
 }   
}