Question

我现在已经在网上研究了一段时间了，但是对我来说它们并没有真正有意义。也许我是Hibernate的新手。

然而，客户表假设加入customerProduct表然后加入产品表我有一个字符串产品变量我想能够匹配产品表名称值列 .. 在SQL SERVER中我想做的查询

select c.Name, c.Address1, c.Address2, c.County, p.Name
from dbo.Customers as c inner join dbo.CustomerProducts as cp
    on c.CustomerID = cp.CustomerID inner join dbo.Products as p 
     on cp.ProductID = p.ProductID
where c.Address1 ='&somthing&' and c.Name='&somthing&' and c.Address1='&somthing&' and p.Name='&somthing&'

然而这就是我现在所拥有的，我无法想到如何在Nhibernate中进行内部联接并将字符串产品变量放入搜索产品表

public IPagedList<Customer> GetSearchPagedCustomer(string product, string practice, string address, string county, int pageNumber = 1, int pageSize = 100)
        {
            ICriteria criteria = Session.CreateCriteria<Customer>();
            if (!string.IsNullOrEmpty(product))
                criteria.Add(Restrictions.Like("Product.Name",product,MatchMode.Anywhere));

            if (!string.IsNullOrEmpty(practice))
                criteria.Add(Restrictions.Like("Name", practice,MatchMode.Anywhere));

            //One value and search 3 column: address 1, address 2 and address 3
            if (!string.IsNullOrEmpty(address))
                criteria.Add(Restrictions.Like("Address1", address, MatchMode.Anywhere) || Restrictions.Like("Address2", address, MatchMode.Anywhere) || Restrictions.Like("Address3", address, MatchMode.Anywhere));
        if (!string.IsNullOrEmpty(county))
            criteria.Add(Restrictions.Like("County", county, MatchMode.Anywhere));

        return criteria.Future<Customer>().OrderBy(x => x.Name).ToPagedList<Customer>(pageNumber, pageSize);
    }

任何人都可以将我的SQL查询代码转换为Nhibernate代码，非常感谢你!!

Answer 1

我猜你的映射是<bag>和<many-to-many>，而客户有一个产品系列：

public class Customer
{
    public virtual IList<Product> Products { get; set; }
    public virtual string Name { get; set; }
    ...

然后如何进行连接的方式如下：

ICriteria criteria = Session.CreateCriteria<Customer>();

if (!string.IsNullOrEmpty(product))
{
     // here we do LEFT JOIN on Products
     var productCriteria = criteria
          .CreateCriteria("Products", "Product", JoinType.LeftOuterJoin);

     // the subcriteria targeting the products table
     productCriteria.Add(Restrictions.Like("Name",product,MatchMode.Anywhere));
} 
...

此外，我们可以在服务器上进行分页和排序

criteria
    .SetMaxResults(pageSize)
    .SetFirstResult(0) // calculate from pageNumber
    .AddOrder(new Order("Name", true))
    .Future<Customer>()
    //.OrderBy(x => x.Name)
    //.ToPagedList<Customer>(pageNumber, pageSize)
;

Nhibernate如何一起做内连接和匹配模式？

1 个答案: