package com.bean;import java.sql.*;
import java.util.*;
import java.util.Vector;
public class DisplayFormBean {
protected String driverName="org.gjt.mm.mysql.Driver"; protected String dbURL="jdbc:mysql://localhost:3306/student";
protected String userID="root";
protected String passwd=" ";
Driver d;
Connection con;
Statement stmt;
ResultSet dbresults;
private Vector result;
public DisplayFormBean(){
result=new Vector();
}
public String connect(){
try{
d=(Driver)Class.forName(driverName).newInstance();
return "程序成功";
}
catch(Exception e){
return "程序失败";
}
}
public String select(){
try{
System.out.println("111111111111111111");
con=DriverManager.getConnection(dbURL,userID,passwd);
System.out.println("22222222222");
stmt=con.createStatement();
dbresults=stmt.executeQuery("select * from student");
System.out.println("333333333333");
while(dbresults.next()){
System.out.println("444444444444");
result.addElement(dbresults.getString(1));
}
System.out.println("55555555555555");
dbresults.close();
stmt.close();
con.close();
return "链接成功";
}
catch(SQLException e){
return "链接错误"+"SQLException"+e.getMessage();
}
}
public Vector getResult(){
return result;
}
public void setResult(Vector avector){
result=avector;
}}这段代码显示 数据库驱动程序有问题 他走到System.out.println("111111111111111111"); 以后就不往下走了 不知道是怎么回事 请高手指点一下
import java.util.*;
import java.util.Vector;
public class DisplayFormBean {
protected String driverName="org.gjt.mm.mysql.Driver"; protected String dbURL="jdbc:mysql://localhost:3306/student";
protected String userID="root";
protected String passwd=" ";
Driver d;
Connection con;
Statement stmt;
ResultSet dbresults;
private Vector result;
public DisplayFormBean(){
result=new Vector();
}
public String connect(){
try{
d=(Driver)Class.forName(driverName).newInstance();
return "程序成功";
}
catch(Exception e){
return "程序失败";
}
}
public String select(){
try{
System.out.println("111111111111111111");
con=DriverManager.getConnection(dbURL,userID,passwd);
System.out.println("22222222222");
stmt=con.createStatement();
dbresults=stmt.executeQuery("select * from student");
System.out.println("333333333333");
while(dbresults.next()){
System.out.println("444444444444");
result.addElement(dbresults.getString(1));
}
System.out.println("55555555555555");
dbresults.close();
stmt.close();
con.close();
return "链接成功";
}
catch(SQLException e){
return "链接错误"+"SQLException"+e.getMessage();
}
}
public Vector getResult(){
return result;
}
public void setResult(Vector avector){
result=avector;
}}这段代码显示 数据库驱动程序有问题 他走到System.out.println("111111111111111111"); 以后就不往下走了 不知道是怎么回事 请高手指点一下
Class.forName(driverName);
加到
con=DriverManager.getConnection(dbURL,userID,passwd);
上面如果还不行,那看看你的lib下面又没有 mysql驱动相关的jar文件。