Question

我正在尝试为NHibernate创建SQL查询：

SQL看起来像这样：

Select p.*
From PPoint p
Inner join PPFile f on p.ImportID = f.ImportID
where p.Name like '%a%'
Or p.Code like '%a%'
Or f.FileName like '%a%'

找不到一个体面的例子，即使听起来很容易。

目前我有：

        var pointList = session
            .CreateCriteria(typeof(PPoint))
           .Add(Restrictions.Or(Restrictions.Or(Restrictions.Or(Restrictions.Or
                Restrictions.Like("Name", "%" + search + "%"),
                Restrictions.Like("Code", "%" + search + "%")),
                Restrictions.Like("Test", "%" + search + "%")),
                Restrictions.Like("Test2", "%" + search + "%")),
                Restrictions.Like("FileName", "%" + search + "%")))
            .List<PPoint>();

NHibernate 2.2版

Answer 1

找到解决方案：

var pointList = session
                .CreateCriteria(typeof(PPoint), "p")
                .CreateAlias("ImportFile", "f", NHibernate.SqlCommand.JoinType.InnerJoin)
                .Add(Restrictions.Disjunction()
                    .Add(Restrictions.Like("p.Name", search, MatchMode.Anywhere))
                    .Add(Restrictions.Like("p.Code", search, MatchMode.Anywhere))
                    .Add(Restrictions.Like("p.Test1", search, MatchMode.Anywhere))
                    .Add(Restrictions.Like("p.Test2", search, MatchMode.Anywhere))
                    .Add(Restrictions.Like("f.FileName", search, MatchMode.Anywhere)))
                .List<PPoint>();

主要是描述映射文件中的关系：

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   assembly="AAA.Data"
                   namespace="AAA.Data.Domain">

  <class name="PPoint" lazy="true">
    <id name="PPointID" />
    <!--<property name="ImportID" />-->
    <many-to-one name="ImportFile" column="ImportID" not-null="true" cascade="all-delete-orphan" />

    <property name="Code" />
    <property name="Test1" />

    ...
  </class>

Answer 2

您使用的是nHibernate 3.0或更高版本吗？这种查询很适合QueryOver API。

string searchString = string.Format("%{0}%", search);
PPoint ppointAlias = null;
PPFile ppFileAlias = null;
var pointList = session.QueryOver<PPoint>(() => ppointAlias)
                       .JoinQueryOver<PPFile>(ppPoint => ppPoint.ImportFile, () => ppFileAlias)
                       .Where(
                                 Restrictions.On(() => ppointAlias.Name).IsLike(searchString))
                                              ||
                                 Restrictions.On(() => ppointAlias.Code).IsLike(searchString))
                                              ||
                                 Restrictions.On(() => ppFileAlias.FileName).IsLike(searchString))
                              )
                        .List();

NHibernate - 加入2个表并搜索

2 个答案: