Hibernate的查询问题

Question

我已经对使用Hibernate

Session session = ICDBHibernateUtil.getSessionFactory().getCurrentSession(); 
session.beginTransaction(); 
User user = (User) session.load(User.class, userid); 

userId is a paramter sent from the client. 
User class 
package com.icdb.data; 

import java.util.Date; 
import java.util.HashSet; 
import java.util.Set; 

public class User implements java.io.Serializable { 

    private Integer userid; 
    private String username; 
    private String email; 
    private String password; 
    private String firstname; 
    private String lastname; 
// private String streetaddress; 
// private String city; 
// private String phone; 
    private String state; 
    private String country; 
    private Date birthdate; 
// private String zipcode; 
    private Set usersesForFavoriteuser = new HashSet(0); 
    private Set recipetipses = new HashSet(0); 
    private Set recipeses = new HashSet(0); 
    private Set recipepictureses = new HashSet(0); 
    private Set onlineuserses = new HashSet(0); 
    private Set generaltipses = new HashSet(0); 
    private Set usersesForFollowinguser = new HashSet(0); 
    private Set recipereviewses = new HashSet(0); 

    public User() { 
    } 

    public User( String username, 
        String password, 
        String email, 
        String firstname, 
        String lastname, 
//     String streetaddress, 
//     String city, 
//     String phone, 
        String state, 
        String country, 
        Date birthdate) 
//     String zipcode) 
    { 
     this.username = username; 
     this.password = password; 
     this.email = email; 
     this.firstname = firstname; 
     this.lastname = lastname; 
//  this.streetaddress = streetaddress; 
//  this.city = city; 
//  this.phone = phone; 
     this.state = state; 
     this.country = country; 
     this.birthdate = birthdate; 
//  this.zipcode = zipcode; 
    } 

    public User( String username, 
        String password, 
        String email, 
        String firstname, 
        String lastname, 
//     String streetaddress, 
//     String city, 
        String phone, 
//     String state, 
//     String country, 
//     String email, 
        Date birthdate, 
//     String zipcode, 
        Set usersesForFavoriteuser, 
        Set recipetipses, 
        Set recipeses, 
        Set recipepictureses, 
        Set onlineuserses, 
        Set generaltipses, 
        Set usersesForFollowinguser, 
        Set recipereviewses) 
    { 
     this.username = username; 
     this.password = password; 
     this.email = email; 
     this.firstname = firstname; 
     this.lastname = lastname; 
//  this.streetaddress = streetaddress; 
//  this.city = city; 
//  this.phone = phone; 
     this.state = state; 
     this.country = country; 
     this.birthdate = birthdate; 
//  this.zipcode = zipcode; 
     this.usersesForFavoriteuser = usersesForFavoriteuser; 
     this.recipetipses = recipetipses; 
     this.recipeses = recipeses; 
     this.recipepictureses = recipepictureses; 
     this.onlineuserses = onlineuserses; 
     this.generaltipses = generaltipses; 
     this.usersesForFollowinguser = usersesForFollowinguser; 
     this.recipereviewses = recipereviewses; 
    } 

    public Integer getUserid() { 
     return this.userid; 
    } 

    public void setUserid(Integer userid) { 
     this.userid = userid; 
    } 

    public String getUsername() { 
     return this.username; 
    } 

    public void setUsername(String username) { 
     this.username = username; 
    } 

    public String getPassword() { 
     return this.password; 
    } 

    public void setPassword(String password) { 
     this.password = password; 
    } 

    public String getFirstname() { 
     return this.firstname; 
    } 

    public void setFirstname(String firstname) { 
     this.firstname = firstname; 
    } 

    public String getLastname() { 
     return this.lastname; 
    } 

    public void setLastname(String lastname) { 
     this.lastname = lastname; 
    } 

// public String getStreetaddress() { 
//  return this.streetaddress; 
// } 

// public void setStreetaddress(String streetaddress) { 
//  this.streetaddress = streetaddress; 
// } 

// public String getCity() { 
//  return this.city; 
// } 

// public void setCity(String city) { 
//  this.city = city; 
// } 

// public String getPhone() { 
//  return this.phone; 
// } 

// public void setPhone(String phone) { 
//  this.phone = phone; 
// } 

    public String getState() { 
     return this.state; 
    } 

    public void setState(String state) { 
     this.state = state; 
    } 

    public String getCountry() { 
     return this.country; 
    } 

    public void setCountry(String country) { 
     this.country = country; 
    } 

    public String getEmail() { 
     return this.email; 
    } 

    public void setEmail(String email) { 
     this.email = email; 
    } 

    public Date getBirthdate() { 
     return this.birthdate; 
    } 

    public void setBirthdate(Date birthdate) { 
     this.birthdate = birthdate; 
    } 

// public String getZipcode() { 
//  return this.zipcode; 
// } 

// public void setZipcode(String zipcode) { 
//  this.zipcode = zipcode; 
// } 

    public Set getUsersesForFavoriteuser() { 
     return this.usersesForFavoriteuser; 
    } 

    public void setUsersesForFavoriteuser(Set usersesForFavoriteuser) { 
     this.usersesForFavoriteuser = usersesForFavoriteuser; 
    } 

    public Set getRecipetipses() { 
     return this.recipetipses; 
    } 

    public void setRecipetipses(Set recipetipses) { 
     this.recipetipses = recipetipses; 
    } 

    public Set getRecipeses() { 
     return this.recipeses; 
    } 

    public void setRecipeses(Set recipeses) { 
     this.recipeses = recipeses; 
    } 

    public Set getRecipepictureses() { 
     return this.recipepictureses; 
    } 

    public void setRecipepictureses(Set recipepictureses) { 
     this.recipepictureses = recipepictureses; 
    } 

    public Set getOnlineuserses() { 
     return this.onlineuserses; 
    } 

    public void setOnlineuserses(Set onlineuserses) { 
     this.onlineuserses = onlineuserses; 
    } 

    public Set getGeneraltipses() { 
     return this.generaltipses; 
    } 

    public void setGeneraltipses(Set generaltipses) { 
     this.generaltipses = generaltipses; 
    } 

    public Set getUsersesForFollowinguser() { 
     return this.usersesForFollowinguser; 
    } 

    public void setUsersesForFollowinguser(Set usersesForFollowinguser) { 
     this.usersesForFollowinguser = usersesForFollowinguser; 
    } 

    public Set getRecipereviewses() { 
     return this.recipereviewses; 
    } 

    public void setRecipereviewses(Set recipereviewses) { 
     this.recipereviewses = recipereviewses; 
    } 

} 

也USERID中的.hbm.xml定义为

<id name="userid" type="java.lang.Integer"> 
    <column name="userid"/> 
    <generator class="identity"/> 
    </id> 

web服务下面的代码因此，我们有用户和其他的表其FK为userId的表。

我需要更新代码来处理带有用户名的请求 - 然后检索userId而不是web服务的上述代码。

请帮助:)

约阿夫

Answer 1

// I assume username is unique 

// username is a parameter 

// to get the full user object by name 
String queryString = "from User where username = :username"; 
Query query = session.createQuery(queryString); 
query.setString(":username", username); 
User user = (User) query.uniqueResult(); 


// to get just the id 
String queryString = "userid from User where username = :username"; 
Query query = session.createQuery(queryString); 
query.setString(":username", username); 
Integer userid = (Integer) query.uniqueResult();