NHibernate系列学习(二)-使用sql和hql以及linq

1.本文主要介绍了NH的三种查询方式

2.界面查看

3.代码架构

4.代码详情

namespace KimismeDemo
{
    public partial class Form2 : Form
    {
        private ISession session;
        private ISessionFactory factory;
        private ITransaction trans;
        public Form2()
        {
            InitializeComponent();
        }

        #region 1.初始化NH - private void Form2_Load(object sender, EventArgs e)
        private void Form2_Load(object sender, EventArgs e)
        {
            Configuration config = new Configuration().AddAssembly("Kimisme");
            factory = config.BuildSessionFactory();
            session = factory.OpenSession();
            dgvList.AutoGenerateColumns = false;
        }
        #endregion

        #region 2.0 执行 sql语句 - private void tsmiExecuteSql_Click(object sender, EventArgs e)
        private void tsmiExecuteSql_Click(object sender, EventArgs e)
        {
            string strSql = "select * from T_Student where sId >1";
            ISQLQuery sqlQuery = session.CreateSQLQuery(strSql).AddEntity(typeof(Student));
            IList<Student> stuList = sqlQuery.List<Student>();
            dgvList.DataSource = stuList.ToList();
        }
        #endregion

        #region 3.0 执行存储过程 -  private void btnExecuteStoreProc_Click(object sender, EventArgs e)
        private void btnExecuteStoreProc_Click(object sender, EventArgs e)
        {
            trans = session.BeginTransaction();

            IList<Student> stuList = new List<Student>();
            ISessionFactoryImplementor imp = factory as ISessionFactoryImplementor;
            IDbConnection conn = imp.ConnectionProvider.GetConnection();
            IDbCommand cmd = imp.ConnectionProvider.GetConnection().CreateCommand();

            try
            {
                cmd.CommandText = "Pro_GetStudent";
                cmd.CommandType = CommandType.StoredProcedure;
                IDbDataParameter parameter = cmd.CreateParameter();
                parameter.ParameterName = "StudentId";
                parameter.Value = 4;
                cmd.Parameters.Add(parameter);
                cmd.Connection = conn;
                IDataReader read = cmd.ExecuteReader();
                while (read.Read())
                {
                    Student stu = new Student();
                    stu.Id = int.Parse(read.GetValue(0).ToString());
                    stu.Name = read.GetValue(1).ToString();
                    stu.Age = int.Parse(read.GetValue(2).ToString());
                    stuList.Add(stu);
                }
                trans.Commit();
                dgvList.DataSource = stuList.ToList();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
        #endregion

        #region 4.0 执行hql语句 -private void tsmiExecuteHql_Click(object sender, EventArgs e)
        private void tsmiExecuteHql_Click(object sender, EventArgs e)
        {
            string strHql = "from Student stu where stu.Id >:stuId";
            IList<Student> stuList = session.CreateQuery(strHql).SetInt32("stuId", 7).List<Student>();
            dgvList.DataSource = stuList.ToList();
        }
        #endregion

        #region 5.0 执行linq语句-聚合函数  - Max
        private void tsmiMax_Click(object sender, EventArgs e)
        {
            var stuList = session.QueryOver<Student>().Where(s => s.Id > 0).List();
            int maxAge = (from s in stuList select s.Age).Max();
            MessageBox.Show(maxAge.ToString());
        }
        #endregion

        #region 5.1 执行linq语句-聚合函数  - Min
        private void tsmiMin_Click(object sender, EventArgs e)
        {
            var stuList = session.QueryOver<Student>().Where(s => s.Id > 0).List();
            int minAge = (from s in stuList select s.Age).Min();
            MessageBox.Show(minAge.ToString());
        }
        #endregion

        #region 5.2执行linq语句-聚合函数  - Avg
        private void tsmiAvg_Click(object sender, EventArgs e)
        {
            var stuList = session.QueryOver<Student>().Where(s => s.Id > 0).List();
            double avgAge = (from s in stuList select s.Age).Average();
            MessageBox.Show(avgAge.ToString());
        }
        #endregion

        #region 5.3执行linq语句-聚合函数  - Sum
        private void tsmiSum_Click(object sender, EventArgs e)
        {
            var stuList = session.QueryOver<Student>().Where(s => s.Id > 0).List();
            int sumAge = (from s in stuList select s.Age).Sum();
            MessageBox.Show(sumAge.ToString());
        }
        #endregion

        #region 5.4 执行linq语句-聚合函数  - Count
        private void tsmiCount_Click(object sender, EventArgs e)
        {
            var stuList = session.QueryOver<Student>().Where(s => s.Id > 0).List();
            int countAge = (from s in stuList select s.Age).Count();
            MessageBox.Show(countAge.ToString());
        }
        #endregion

    }
}

5.代码下载

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