NSun之快速开发NSunV3.0发布
Lambda + NSunV1.5 = NSunV3.0，NSunV1.X及以前版本是在.Net Formwork 2.0平台上开发的，随着
.Net Formwork4.0的推出 ，.Net 3.5的普及率大幅提升，而NSunV3.0正是在.Net Formwork 3.5平台上加入了
其新的特性，此版本同样适用V1.5的操作方式以及实体类。
Lambda在LINQ以及扩展方法中相信很多人都对其非常熟悉。那么我就直接介绍NSunV3.0的操作使用。对于
NSunV1.5的修改有：新增Lambda查询，新增查询扩展方法。
操作类从DBFactory中获得，这个类由生成器生成，可以修改数据库连接，包括多数据库连接以及数据库连接
加密。
实体类（Entity）：
代码
[Serializable]
[Table("users")] //设置对应表名
public class UsersEntity : BaseEntity //继承BaseEntity
{
[PrimaryKeyAttribute(true)] //设置主键，参数为是否自增长
public Int64 Id { get; set; }
public String Name { get; set; }
public String Pass { get; set; }
public DateTime? Logintime { get; set; }
}
操作类（DBFactory）：
// 设置连接对象
ConnectionData db = ConnectionData.Default;
// 设置操作对象
DBQuery<UsersEntity> dbuser = new DBQuery<UsersEntity>(db);
Create：
UsersEntity us = new UsersEntity()
{
Name = "测试用户",
Pass = "123",
Logintime = DateTime.Now
};
// 如果实体主键为自增长时返回自增长编号,不是则返回1或0
dbuser.Save(us);
Update：
代码
1、持久化实体进行修改
持久化对象通过查询或者插入得到。
us.Name = "测试用户123";//修改名称
dbuser.Save(us); //保存
2、按条件与特定列修改
var update= db.CreateUpdate();
update.Where(p1 => p1.Id == 1);
update.AddColumn(p1 => p1.Name, "测试");
update.Execute(); //也可以通过操作对象进行操作 us.Update(update);
Delete：
代码
1、主键删除
dbuser.Delete(1);//按主键删除
dbuser.Delete(us);//通过实体删除，这里也是持久化对象
2、条件删除
var delete= dbuser.CreateDelete();
delete.Where(p1 => p1.Id == 2);
delete.Execute();//也可以通过操作对象进行操作 us.Delete(delete);
Read：
1、Select
代码
var query = dbuser.CreateQuery();
query.Where(p1 => p1.Id == 1);
Console.WriteLine(query.ToDbCommandText());
query.Reset();//查询重置
query.Where(p1 => p1.Id == 1 || p1.Id == 2);
Console.WriteLine(query.ToDbCommandText());
query.Reset();
query.Where(p1 => p1.Id > 7 && p1.Name.StartsWith("W"));
Console.WriteLine(query.ToDbCommandText());
query.Reset();
query.Where(p1 => p1.Name.Like("%wui%"));
Console.WriteLine(query.ToDbCommandText());
query.Reset();
query.Where(p1 => p1.Name.Length() == 2);
Console.WriteLine(query.ToDbCommandText());
query.Reset();
query.Where(p1 => p1.Pass.ToNumber() == 5);
Console.WriteLine(query.ToDbCommandText());
query.Reset();
query.Where(p1 => p1.Id.Between(1, 8));
Console.WriteLine(query.ToDbCommandText());
query.Reset();
query.Where(p1 => p1.Id.In(1, 2, 3));
Console.WriteLine(query.ToDbCommandText());
query.Reset();
query.Where(p1 => p1.Name.ToUpper() == "WUI");
Console.WriteLine(query.ToDbCommandText());
query.Reset();
query.Where(p1 => p1.Name.ToLower() == "wui");
Console.WriteLine(query.ToDbCommandText());
query.Reset();
query.Where(p2 => p2.Name.ToLower() == "wui");
query.Where<UsInfo>(p2 => p2.Name.ToLower() == "name3");
Console.WriteLine(query.ToDbCommandText());
2、Order
代码
//order
query.Reset();
query.Where(p1 => p1.Id != 1);
query.OrderBy(p1 => p1.Id.Asc());
Console.WriteLine(query.ToDbCommandText());
query.Reset();
query.Where(p1 => p1.Id != 1);
query.OrderBy(p1 => new[] { p1.Id.Asc(), p1.Name.Desc(), p1.Pass.Asc() });
Console.WriteLine(query.ToDbCommandText());
3、Group
代码
//group
query.Reset(p1 => new { p1.Name, maxid = p1.Id.Max() });
query.Where(p1 => p1.Id != 1);
query.GroupBy(p1 => p1.Name);
Console.WriteLine(query.ToDbCommandText());
query.Reset(p1 => new { p1.Name, maxid = p1.Id.Max(),p1.Pass });
query.Where(p1 => p1.Id != 1);
query.GroupBy(p1 => new { p1.Name, p1.Pass });
Console.WriteLine(query.ToDbCommandText());
//having
query.Reset(p1 => new { p1.Name, maxid = p1.Id.Max() });
query.Where(p1 => p1.Id != 1);
query.GroupBy(p1 => p1.Name);
query.Having(p1 => p1.Id.Max() > 24);
Console.WriteLine(query.ToDbCommandText());
4、Join
代码
//join test two
query.Reset();
query.Join<UsInfo>((j1, i1) => j1.Id == i1.Id);
Console.WriteLine(query.ToDbCommandText());
query.Reset();
query.Join<UsInfo>((j1, i1) => j1.Id == i1.Id);
query.Where<UsInfo>((j1, i1) => j1.Name.Like("wui") && i1.Name == "name13");
Console.WriteLine(query.ToDbCommandText());
query.Reset<UsInfo>((p1, p2) => new { p1.Name, p2name = p2.Name });
query.Join<UsInfo>((j1, i1) => j1.Id == i1.Id);
query.Where(j1 => j1.Name == "wui");
query.Where<UsInfo>(i1 => i1.Name == "name13");
query.OrderBy<UsInfo>((p1, p2) => new[] { p1.Id.Desc(), p2.Name.Desc() });
Console.WriteLine(query.ToDbCommandText());
query.Reset<UsInfo>((p1, p2) => new { p1.Name, p2name = p2.Name });
query.Join<UsInfo>((j1, i1) => j1.Id == i1.Id);
query.Join<StudentInfo, UsInfo>((j1, i1) => j1.Id == i1.Id);
Console.WriteLine(query.ToDbCommandText());
query.Reset();
query.BindColumn(j1 => new { j1.Name, j1.Logintime })//绑定显示列
.BindColumn<UsInfo>(i1 => new { i1.Name, i1.Id })
.BindColumn<StudentInfo>(i1 => new { i1.Name, i1.Id });
query.Join<UsInfo>((j1, i1) => j1.Id == i1.Id);
query.LeftJoin<StudentInfo, UsInfo>((f1, e1) => f1.Id == e1.Id);
query.Where<StudentInfo>(s1 => s1.Id == null);
Console.WriteLine(query.ToDbCommandText());
query.Reset();
query.BindColumn(j1 => new { j1.Name, cout = j1.Logintime.Count() });
query.Join<UsInfo>((j1, i1) => j1.Id == i1.Id);
query.GroupBy(p1 => p1.Name);
Console.WriteLine(query.ToDbCommandText());
5、SelfFunction （自定义函数）：
代码
query.Reset(p1 => new
{
idadd = p1.Id.SelfMethodExtensions(
System.Data.DbType.AnsiString, "dbo", "getidaddone")
});
Console.WriteLine(query.ToDbCommandText());
query.Reset();
query.Where(p1 => p1.Id.SelfMethodExtensions(
System.Data.DbType.AnsiString, "dbo", "getidaddone") == "12");
Console.WriteLine(query.ToDbCommandText());
query.Reset();
query.Where(p1 => p1.Id.SelfMethodExtensions(System.Data.DbType.AnsiString, string.Empty, "getdate", false) == "20101025");
Console.WriteLine(query.ToDbCommandText());
6、ORM（扩展方法实现）：
代码
public static class CustomersExtensionMethods
{
public static List<OrdersInfo> Orderss(this CustomersInfo info)
{
return DBFactory.dbOrders.CreateQuery().Where<OrdersInfo>((j1, i1) => i1.CustomerID == j1.CustomerID).ToList();
}
}
//one to many
var ndb = DBFactory.dbOrders;
var nquery = ndb.CreateQuery();
nquery.Where(p1 => p1.OrderID == 10248);
var enorder = ndb.SelectToEntity(nquery);
Console.WriteLine(enorder.OrderID);
var encus = enorder.Customers();
Console.WriteLine(encus.CustomerID);
//many to one
var cdb = DBFactory.dbCustomers;
var cquery = cdb.CreateQuery();
cquery.Where(p1 => p1.CustomerID == "VINET");
var cen = cdb.SelectToEntity(cquery);
Console.WriteLine(cen.Orderss().Count);
7、Linq原生查询
代码
var list = from S in DBFactory.dbuser select S ;
list = list.Skip(0).Take(10);
Console.WriteLine(list.Count());
var list2 = from p in DBFactory.dbUsers where p.Id > 2 && p.Name.Contains("a") select p;
Console.WriteLine(list2.Count());
注：实体生成器中可以选择V1.5实体，此版兼容V1.5操作。
最新更新：2011-06-10 20：10(核心包)
下载地址：
NSun.CoreV3.0.rar（核心包）
DbProvidersV3.0.rar（其他数据库扩展）
EntityGenerateV3.0.rar（实体生成器）
QuerySampleV3.0.rar（查询演示，内涵数据库表sql）
OtherDB_SqliteV3.0.rar（SQLite数据库演示）
