Java测试Mysql数据库的最大连接数

Java测试Mysql数据库的最大连接数类:

 

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:3306/mysql""root""hicc"); 
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" 

}

 

DOS下运行结果:

 

 

 

很爽吧

posted on 2008-08-07 21:55  俱正Steven  阅读(3075)  评论(3编辑  收藏  举报

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