继续学习NHibernate

今天进一步学习了NHibernate,研究了如何添加及查找有外键关系的表。

public class DeptInfo
{
        public virtual string DeptId { get; set; }
        public virtual string DeptName { get; set; }
}

其对应的配置

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class name="Test.Model.DeptInfo, Test.Model" table="DeptInfo">
    <id name="DeptId" type="String" unsaved-value="null">
      <column name="DeptId" length="50" sql-type="String" not-null="true" unique="true" index="PK_DeptInfo"/>
      <generator class="assigned" />
    </id>
    <property name="DeptName" type="String">
      <column name="DeptName" length="50" sql-type="varchar" not-null="true"/>
    </property>
  </class>
</hibernate-mapping>

public class UserInfo
{
        public virtual string UserID { get; set; }
        public virtual string UserName { get; set; }
        public virtual string Email { get; set; }
        public virtual DeptInfo DeptInfo { get; set; }
} 

其对应的配置

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class name="Test.Model.UserInfo, Test.Model" table="UserInfo">
    <id name="UserID" type="string" unsaved-value="null">
      <column name="UserID" length="50" sql-type="String" not-null="true" unique="true" index="PK_UserInfo"/>
      <generator class="assigned" />
    </id>
    <property name="UserName" type="String">
      <column name="UserName" length="50" sql-type="varchar" not-null="true"/>
    </property>
    <property name="Email" type="String">
      <column name="Email" length="50" sql-type="String" not-null="true"/>
    </property>
    <many-to-one name="DeptInfo" class= "Test.Model.DeptInfo,Test.Model" column="DeptId"/>
  </class>
</hibernate-mapping>

部分代码如下(上篇我对NHibernate的理解里已经讲述了，这里就不再重复了）：

添加用户代码：

DeptInfo deptInfo = new DeptInfo();
deptInfo.DeptId = ddlDept.SelectedValue;
UserInfo userInfo = new UserInfo();
userInfo.DeptInfo = deptInfo;
userInfo.UserID = txtUserID.Text;
userInfo.UserName = txtUserName.Text;
userInfo.Email = txtEmail.Text;
session.Save(u);

查找用户代码：

UserInfo userInfo = (UserInfo)session.Get(typeof(UserInfo), "1");//查找唯一一条记录，其中1为主键的值UserId

IList<UserInfo> lstUserInfo = session.CreateQuery("from UserInfo").List<UserInfo>();//查找所有记录

然后想将DeptName显示在界面上，只能如下：

DataTable dt = new DataTable();
dt.Columns.Add("UserName");
dt.Columns.Add("DeptName");
foreach (UserInfo userInfo in u)
{
          DataRow dr = dt.NewRow();
          dr["UserName"] = userInfo.UserName;
          dr["DeptName"] = userInfo.DeptInfo.DeptName;
          dt.Rows.Add(dr);
}

2012.2.16于上海  章松山