DNetORM 一款轻量级的ORM框架

 <appSettings>
    <add key="connectionName" value="DB"/>
  </appSettings>
  <connectionStrings>
    <!--<add name="DB" connectionString="Data Source=localhost/XE;User Id=hr;Password=hr;" providerName="Oracle.ManagedDataAccess" />-->
    <!--<add name="DB" connectionString="host=localhost;database=test;uid=root;pwd=sa123456;charset=utf8;" providerName="MySql.Data.MySqlClient" />-->
    <add name="DB" connectionString="Data Source=localhost;Initial Catalog=test;Persist Security Info=True;User ID=sa;Password=123456;" providerName="System.Data.SqlClient" />
</connectionStrings>

 public class Book
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int? BookID { get; set; }
        public string BookName { get; set; }
        public int? AuthorID { get; set; }

        [NotMapped]
        public string AuthorName { get; set; }
        public double? Price { get; set; }

        public DateTime? PublishDate { get; set; }
    }

            using (DNetContext db = new DNetContext())
            {
                var authorid = db.Add(new Author { AuthorName = "张三", Age = 30, IsValid = true });
                db.Add(new Book { BookName = "从入门到放弃", Price = 20.5, PublishDate = DateTime.Now, AuthorID = authorid });
            }

            using (DNetContext db = new DNetContext())
            {

                int authorid = db.GetMax<Author>(m => (int)m.AuthorID);
                db.Update<Author>(m => m.AuthorName = "恶魔猎手", m => m.AuthorID == authorid);

            }

            using (DNetContext db = new DNetContext())
            {
                var author = db.GetSingle<Author>(m => true, q => q.OrderBy(m => m.AuthorID));
                var effect = db.Delete(author);

                int authorid = db.GetMax<Author>(m => (int)m.AuthorID);
                db.Delete<Author>(m => m.AuthorID == authorid);

            }

            using (DNetContext db = new DNetContext())
            {
                var author = db.GetSingle<Author>(m => true, q => q.OrderBy(m => m.AuthorID));

                author = db.GetSingle<Author>(m => m.AuthorName.Contains("李四") && m.IsValid == true);

                var authors= db.GetList<Author>(m => m.AuthorName.StartsWith("张三") && m.IsValid == true);

                //获取动态类型
                List<dynamic> name = db.GetDistinctList<Author>(m => m.AuthorName.StartsWith("王五") && m.IsValid == true,m=>m.AuthorName);
                
                List<string> name1 = db.GetDistinctList<Author,string>(m => m.AuthorName.StartsWith("王五") && m.IsValid == true, m => m.AuthorName);
                
                //获取最大值
                var authorid = db.GetMax<Author>(m => (int)m.AuthorID);

                //动态查询
                WhereBuilder<Author> where = new WhereBuilder<Author>();
                where.And(m=>m.AuthorName.Contains("张三"));
                where.And(m => m.AuthorID==3);
                where.Or(m=>m.IsValid==true);
                db.GetList<Author>(where.WhereExpression);

                //分页参数由前台传来
                PageFilter page = new PageFilter { PageIndex=1, PageSize=10 };
                page.And<Author>(m=> "守望者的天空".Contains(m.AuthorName));
                page.OrderBy<Author>(q=>q.OrderBy(m=>m.AuthorName).OrderByDescending(m=>m.AuthorID));
                PageDataSource<Author> pageSource= db.GetPage<Author>(page);
            }

            using (DNetContext db = new DNetContext())
            {
                var books = db.JoinQuery.LeftJoin<Book, Author>((m, n) => m.AuthorID == n.AuthorID && n.IsValid == true)
                     .Fields<Book, Author>((m, n) => new { m, n.AuthorName })
                     .OrderByAsc<Book>(m => m.BookName)
                     .Select<Book>();

                var join = db.JoinQuery.LeftJoin<Book, Author>((m, n) => m.AuthorID == n.AuthorID && n.IsValid == true)
                     .Fields<Book, Author>((m, n) => new { m, n.AuthorName })
                     .OrderByAsc<Book>(m => m.BookName);
                PageFilter page = new PageFilter { PageIndex = 1, PageSize = 10 };//分页参数前台传来
                join.SelectPage<Book>(page);

            }

            using (DNetContext db = new DNetContext())
            {
                db.DataBase.BeginTransaction();
                try
                {
                    List<Author> authors = new List<Author>();
                    for (int i = 0; i <= 100; i++)
                    {
                        authors.Add(new Author { AuthorName = "测试" + i.ToString(), Age = 20, IsValid = true });
                    }
                    db.Add(authors);
                    db.DataBase.Commit();
                }
                catch
                {
                    db.DataBase.Rollback();
                }
            }

            using (DNetContext db = new DNetContext())
            {
                StringBuilder sql = new StringBuilder();
                List<DbParameter> parameters = new List<DbParameter>();

                sql.AppendFormat(@"SELECT {0},A.AuthorName FROM Book B 
LEFT JOIN Author A ON A.AuthorID=B.AuthorID WHERE", SqlBuilder.GetSelectAllFields<Book>("B"));
                sql.Append(" B.BookID>@BookID ");
                parameters.Add(db.GetDbParameter("BookID",1));

                PageDataSource<Book> books = db.GetPage<Book>(sql.ToString(),new PageFilter { PageIndex=1, PageSize=5 }, parameters.ToArray());
                List<Book> bks = db.GetList<Book>(sql.ToString(), parameters.ToArray());
            }