Mysql的最大连接数怎样用java程序测试
来源：岁月联盟
时间：2007-08-01
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：
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" } }
