Hibernate的JPA搜索兩個連接的表

Question

我非常新的Hibernate和Spring中的JPA實現，所以基本上都設置MySQL 5數據庫映射到的域名下面的對象。

我試圖尋找Location在Company_Details表，但我無法弄清楚如何搜索類Product_Details爲Product_Name同時

如果有人可以幫助將是巨大的。

Company_Details

@Entity 
public class Company_Details implements Serializable{ 

/** 
* 
*/ 
private static final long serialVersionUID = 3336251433829975771L; 


@Id 
@GeneratedValue 
private Integer Id; 
private String Company; 
private String Address_Line_1; 
private String Address_Line_2; 
private String Postcode; 
private String County; 
private String Country; 
private String Mobile_Number; 
private String Telephone_Number; 
private String URL; 
private String Contact; 
private String Logo_URL; 
private double Amount_Overall; 
private double Amount_Paid; 
private Timestamp Date_Joined; 
private int Account_Details; 
@OneToMany(fetch = FetchType.EAGER, mappedBy = "Company_Id") 
private List<Product_Details> products; 

public Integer getId() { 
    return Id; 
} 

public void setId(Integer id) { 
    Id = id; 
} 

public String getCompany() { 
    return Company; 
} 

public void setCompany(String company) { 
    Company = company; 
} 

public String getAddress_Line_1() { 
    return Address_Line_1; 
} 

public void setAddress_Line_1(String address_Line_1) { 
    Address_Line_1 = address_Line_1; 
} 

public String getAddress_Line_2() { 
    return Address_Line_2; 
} 

public void setAddress_Line_2(String address_Line_2) { 
    Address_Line_2 = address_Line_2; 
} 

public String getPostcode() { 
    return Postcode; 
} 

public void setPostcode(String postcode) { 
    Postcode = postcode; 
} 

public String getCounty() { 
    return County; 
} 

public void setCounty(String county) { 
    County = county; 
} 

public String getCountry() { 
    return Country; 
} 

public void setCountry(String country) { 
    Country = country; 
} 

public String getMobile_Number() { 
    return Mobile_Number; 
} 

public void setMobile_Number(String mobile_Number) { 
    Mobile_Number = mobile_Number; 
} 

public String getTelephone_Number() { 
    return Telephone_Number; 
} 

public void setTelephone_Number(String telephone_Number) { 
    Telephone_Number = telephone_Number; 
} 

public String getURL() { 
    return URL; 
} 

public void setURL(String uRL) { 
    URL = uRL; 
} 

public String getContact() { 
    return Contact; 
} 

public void setContact(String contact) { 
    Contact = contact; 
} 

public String getLogo_URL() { 
    return Logo_URL; 
} 

public void setLogo_URL(String logo_URL) { 
    Logo_URL = logo_URL; 
} 

public double getAmount_Overall() { 
    return Amount_Overall; 
} 

public void setAmount_Overall(double amount_Overall) { 
    Amount_Overall = amount_Overall; 
} 

public double getAmount_Paid() { 
    return Amount_Paid; 
} 

public void setAmount_Paid(double amount_Paid) { 
    Amount_Paid = amount_Paid; 
} 

public Timestamp getDate_Joined() { 
    return Date_Joined; 
} 

public void setDate_Joined(Timestamp date_Joined) { 
    Date_Joined = date_Joined; 
} 

public int getAccount_Details() { 
    return Account_Details; 
} 

public void setAccount_Details(int account_Details) { 
    Account_Details = account_Details; 
} 

public List<Product_Details> getProducts() { 
    return products; 
} 

public void setProducts(List<Product_Details> products) { 
    this.products = products; 
} 

Product_Details

@Entity 
    public class Product_Details implements Serializable{ 

/** 
* 
*/ 
private static final long serialVersionUID = 6477618197240654478L; 

@Id 
@GeneratedValue 
private Integer Id; 
private Integer Company_Id; 
private String Product_Name; 
private String Description; 
private String Main_Photo_URL; 
private String Other_Photo_URLS; 
private Integer Total_Bookings; 
private double Average_Rating; 
private Integer Number_Of_Slots; 
private Integer Time_Per_Slot; 
private double Price_Per_Slot; 
private String Monday_Open; 
private String Tuesday_Open; 
private String Wednesday_Open; 
private String Thursday_Open; 
private String Friday_Open; 
private String Saturday_Open; 
private String Sunday_Open; 
private String Dates_Closed; 

public Integer getId() { 
    return Id; 
} 
public void setId(Integer id) { 
    Id = id; 
} 
public Integer getCompany_Id() { 
    return Company_Id; 
} 
public void setCompany_Id(Integer company_Id) { 
    Company_Id = company_Id; 
} 
public String getProduct_Name() { 
    return Product_Name; 
} 
public void setProduct_Name(String product_Name) { 
    Product_Name = product_Name; 
} 
public String getDescription() { 
    return Description; 
} 
public void setDescription(String description) { 
    Description = description; 
} 
public String getMain_Photo_URL() { 
    return Main_Photo_URL; 
} 
public void setMain_Photo_URL(String main_Photo_URL) { 
    Main_Photo_URL = main_Photo_URL; 
} 
public String getOther_Photos_URLS() { 
    return Other_Photo_URLS; 
} 
public void setOther_Photos_URLS(String other_Photo_URLS) { 
    Other_Photo_URLS = other_Photo_URLS; 
} 
public Integer getTotal_Bookings() { 
    return Total_Bookings; 
} 
public void setTotal_Bookings(Integer total_Bookings) { 
    Total_Bookings = total_Bookings; 
} 
public double getAverage_Rating() { 
    return Average_Rating; 
} 
public void setAverage_Rating(double average_Rating) { 
    Average_Rating = average_Rating; 
} 
public Integer getNumber_Of_Slots() { 
    return Number_Of_Slots; 
} 
public void setNumber_Of_Slots(Integer number_Of_Slots) { 
    Number_Of_Slots = number_Of_Slots; 
} 
public Integer getTime_Per_Slot() { 
    return Time_Per_Slot; 
} 
public void setTime_Per_Slot(Integer time_Per_Slot) { 
    Time_Per_Slot = time_Per_Slot; 
} 
public double getPrice_Per_Slot() { 
    return Price_Per_Slot; 
} 
public void setPrice_Per_Slot(double price_Per_Slot) { 
    Price_Per_Slot = price_Per_Slot; 
} 
public String getMonday_Open() { 
    return Monday_Open; 
} 
public void setMonday_Open(String monday_Open) { 
    Monday_Open = monday_Open; 
} 
public String getTuesday_Open() { 
    return Tuesday_Open; 
} 
public void setTuesday_Open(String tuesday_Open) { 
    Tuesday_Open = tuesday_Open; 
} 
public String getWednesday_Open() { 
    return Wednesday_Open; 
} 
public void setWednesday_Open(String wednesday_Open) { 
    Wednesday_Open = wednesday_Open; 
} 
public String getThursday_Open() { 
    return Thursday_Open; 
} 
public void setThursday_Open(String thursday_Open) { 
    Thursday_Open = thursday_Open; 
} 
public String getFriday_Open() { 
    return Friday_Open; 
} 
public void setFriday_Open(String friday_Open) { 
    Friday_Open = friday_Open; 
} 
public String getSaturday_Open() { 
    return Saturday_Open; 
} 
public void setSaturday_Open(String saturday_Open) { 
    Saturday_Open = saturday_Open; 
} 
public String getSunday_Open() { 
    return Sunday_Open; 
} 
public void setSunday_Open(String sunday_Open) { 
    Sunday_Open = sunday_Open; 
} 
public String getDates_Closed() { 
    return Dates_Closed; 
} 
public void setDates_Closed(String dates_Closed) { 
    Dates_Closed = dates_Closed; 
} 

}

@Service 
public class ProductServiceImpl implements ProductService{ 

private final static Logger LOG = Logger.getLogger(ProductServiceImpl.class.getName()); 

@PersistenceContext 
EntityManager em; 

@Transactional 
public List<Company_Details> search(Search search) { 
    LOG.info("Entering search method"); 
    CriteriaBuilder builder = em.getCriteriaBuilder(); 
    CriteriaQuery<Company_Details> c = builder.createQuery(Company_Details.class); 
    Root<Company_Details> companyRoot = c.from(Company_Details.class); 
    c.select(companyRoot); 
    c.where(builder.equal(companyRoot.get("County"),search.getLocation())); 
    return em.createQuery(c).getResultList(); 
} 

}

Answer 1

您需要兩個條件：在Company_Details類 準則和標準在Product_Details類

然後

Criteria crit1 = session.createCriteria(Company_Details.class); 
crit1.add(restriction) 

Criteria crit2 = crit1.createCriteria("products"); 
crit2.add(restriction) 

// Then query crit1 
List results = crit1.list();