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Mysql的最大连接数用java程序测试的方法

2011-12-28 16:17 387 查看

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.Statement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.io.IOException;
class testMaxConn{

   public static void main(String args[]){

     int count=0;

     Connection []conn=new Connection[1000];

     Statement []stmt =new Statement[1000];

     ResultSet []rs =new ResultSet[1000];

    try{

     Class.forName

("com.MySQL.jdbc.Driver").newInstance();

for(count=0;count<300;count++){

conn[count] = DriverManager.getConnection

("jdbc:mysql://localhost/MySQL", "root", "");

      stmt[count]=conn[count].createStatement();

      rs[count]=stmt[count].executeQuery

("SELECT * FROM user");

      while (rs[count].next()){

//System.out.println(rs.getString(1)+

"t "+rs.getString(2));

      }

      System.out.print(count+"t");

     }
    }catch(SQLException ex1){

      System.out.println("n"+ex1.toString());

    }catch(InstantiationException ex2){

      System.out.println("n"+ex2.toString());

    }catch(ClassNotFoundException ex3){

      System.out.println("n"+ex3.toString());

    }catch(IllegalAccessException ex4){

      System.out.println("n"+ex4.toString());

    }finally{

      try{

        System.out.println("nSystem has opened

"+count--+" MySQL connections.nPress Enter key

to close the connections");

        System.in.read();

        System.out.println

("nClose the Connections:");

        for(;count>=0;count--){

         rs[count].close();

         stmt[count].close();

         conn[count].close();

         System.out.print(count+"t");

        }

      }catch(SQLException ex){

       System.out.println

("n Close connection exception:"+ex.toString());

      }catch(IOException io_ex){}

    }//end the first "try"

   }

}

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标签： mysql java 测试 exception jdbc import

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