Question

/ * java class * /

package com.tutoria;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Properties;
public class dbhandler {
Connection conn ;

public dbhandler() 
{
    conn = null;
    String userName = "root";
    String password = "1234";
    String serverName = "localhost";
    int portNumber = 3306;

    String dbName = "a2";

    try {
         conn = null;

        Properties connectionProps = new Properties();
        connectionProps.put("user", userName);
        connectionProps.put("password", password);
        System.out.println("trying to get connection!! :)");
        conn = DriverManager.getConnection("jdbc:mysql://" + serverName
                + ":" + portNumber + "/" + dbName, connectionProps);

        System.out.println(" Connection achieved!! ");
            //conn.close();
    }
    catch (Exception e)
    {
        e.printStackTrace();
        System.out.println("Exception " +e);
    }

}

public boolean create_account (String table)
{

    return true;
}
public boolean insertplayer()
{
    return true;
}
public String  getid()
{
    String a=null;

    String sqlquery="Select * from student "+" where id='145' ";    try{

    PreparedStatement Stat1=(PreparedStatement)conn.prepareStatement(sqlquery);

    ResultSet Rset=Stat1.executeQuery(sqlquery);
    while (Rset.next())
    {
        a=Rset.getString(2);
    }}catch (Exception e){
System.out.println(e);}return a;
    }}






/* xhtml*/ 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<h:form>
<h:panelGrid columns="2">
<h:outputText value="Name"></h:outputText>
<h:inputText value="#{person.name}"></h:inputText>
<h:outputText value="Password"></h:outputText>
<h:inputText value="#{person.id}"></h:inputText>
<h:commandButton value="Login" action="#{loginBean.idreturn}">
</h:commandButton>
</h:panelGrid>
</h:form>
</html>

/ *我添加了连接器的jar文件，但它仍然没有显示驱动程序当我只运行java类文件时，它会检索结果而不会给出任何错误..如果有人知道这有帮助我。谢谢你的进步.. * /

当我尝试通过jsf连接数据库mysql时，我得到没有潜水员发现的错误

0 个答案: