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Mysql的最大连接数怎样用java程序测试

2009-05-12 20:46:37来源：未知阅读 ()

以前工作的时候由于Oracle8i数据库经常出现用户过多的错误,由于数据量大,经常出现ORA:12500错误,但主要原因是访问过多而引起的,后来就用Java写了个简单的用JDBC连接来测试Oracle最大连接数的程序.现在常用MySQL,所以又写了一个简单的测试其最大连接数的程序，在此介绍给大家：

以下为引用的内容：

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"
   }
}