ServiceStack.OrmLite 笔记9 -code first 必须的代码优先

复杂点的使用3

---

code first的使用，支持复杂类型

public enum PhoneType {

Home,

Work,

Mobile,

}

public enum AddressType {

Home,

Work,

Other,

}

public class Address {

public string Line1 { get; set; }

public string Line2 { get; set; }

public string ZipCode { get; set; }

public string State { get; set; }

public string City { get; set; }

public string Country { get; set; }

}

public class Customer {

public Customer() {

this.PhoneNumbers = new Dictionary<PhoneType, string>();

this.Addresses = new Dictionary<AddressType, Address>();

}

[AutoIncrement] // 创建自增长主键
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
[Index(Unique = true)] // 创建索引
public string Email { get; set; }
public Dictionary<PhoneType, string> PhoneNumbers { get; set; }  //Blobbed
public Dictionary<AddressType, Address> Addresses { get; set; }  //Blobbed
public DateTime CreatedAt { get; set; }

}

public class Order {

[AutoIncrement]
public int Id { get; set; }
[References(typeof(Customer))]      //外键
public int CustomerId { get; set; }
[References(typeof(Employee))]      //Creates Foreign Key
public int EmployeeId { get; set; }
public Address ShippingAddress { get; set; } //Blobbed (no Address table)
public DateTime? OrderDate { get; set; }
public DateTime? RequiredDate { get; set; }
public DateTime? ShippedDate { get; set; }
public int? ShipVia { get; set; }
public decimal Freight { get; set; }
public decimal Total { get; set; }

}

public class OrderDetail {

[AutoIncrement]
public int Id { get; set; }
[References(typeof(Order))] //Creates Foreign Key
public int OrderId { get; set; }
public int ProductId { get; set; }
public decimal UnitPrice { get; set; }
public short Quantity { get; set; }
public decimal Discount { get; set; }

}

public class Employee {

public int Id { get; set; }

public string Name { get; set; }

}

public class Product {

public int Id { get; set; }

public string Name { get; set; }

public decimal UnitPrice { get; set; }

}

//Setup SQL Server Connection Factory

var dbFactory = new OrmLiteConnectionFactory(

@"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\App_Data\Database1.mdf;Integrated Security=True;User Instance=True",

SqlServerDialect.Provider);

//Use in-memory Sqlite DB instead

//var dbFactory = new OrmLiteConnectionFactory(

// ":memory:", false, SqliteDialect.Provider);

//Non-intrusive: All extension methods hang off System.Data.* interfaces

using (IDbConnection db = Config.OpenDbConnection())

{

//Re-Create all table schemas:

db.DropTable();

db.DropTable();

db.DropTable();

db.DropTable();

db.DropTable();

db.CreateTable();

db.CreateTable();

db.CreateTable();

db.CreateTable();

db.CreateTable();

db.Insert(new Employee { Id = 1, Name = "Employee 1" });

db.Insert(new Employee { Id = 2, Name = "Employee 2" });

var product1 = new Product { Id = 1, Name = "Product 1", UnitPrice = 10 };

var product2 = new Product { Id = 2, Name = "Product 2", UnitPrice = 20 };

db.Save(product1, product2);

var customer = new Customer {

FirstName = "Orm",

LastName = "Lite",

Email = "ormlite@servicestack.net",

PhoneNumbers =

{

{ PhoneType.Home, "555-1234" },

{ PhoneType.Work, "1-800-1234" },

{ PhoneType.Mobile, "818-123-4567" },

},

Addresses =

{

{ AddressType.Work, new Address {

Line1 = "1 Street", Country = "US", State = "NY", City = "New York", ZipCode = "10101" }

},

},

CreatedAt = DateTime.UtcNow,

};

var customerId = db.Insert(customer, selectIdentity: true); //Get Auto Inserted Id

customer = db.Single(new { customer.Email }); //Query

Assert.That(customer.Id, Is.EqualTo(customerId));

//Direct access to System.Data.Transactions:

using (IDbTransaction trans = db.OpenTransaction(IsolationLevel.ReadCommitted))

{

var order = new Order {

CustomerId = customer.Id,

EmployeeId = 1,

OrderDate = DateTime.UtcNow,

Freight = 10.50m,

ShippingAddress = new Address {

Line1 = "3 Street", Country = "US", State = "NY", City = "New York", ZipCode = "12121" },

};

db.Save(order); //Inserts 1st time

  //order.Id populated on Save().
  var orderDetails = new[] {
      new OrderDetail {
          OrderId = order.Id,
          ProductId = product1.Id,
          Quantity = 2,
          UnitPrice = product1.UnitPrice,
      },
      new OrderDetail {
          OrderId = order.Id,
          ProductId = product2.Id,
          Quantity = 2,
          UnitPrice = product2.UnitPrice,
          Discount = .15m,
      }
  };
  db.Save(orderDetails);
  order.Total = orderDetails.Sum(x => x.UnitPrice * x.Quantity * x.Discount) + order.Freight;
  db.Save(order); //Updates 2nd Time
  trans.Commit();

}

}

[Ignore] 可以忽略某个属性

![此处输入图片的描述][1]

[Alias("Shippers")]

public class Shipper

: IHasId

{

[AutoIncrement]

[Alias("ShipperID")]

public int Id { get; set; }

[Required]//是否必须
[Index(Unique = true)]//索引
[StringLength(40)]//长度
public string CompanyName { get; set; }
[StringLength(24)]
public string Phone { get; set; }
[References(typeof(ShipperType))]
public int ShipperTypeId { get; set; }

}

这个基本就够用了 codefirst啊

[Alias("ShipperTypes")]

public class ShipperType

: IHasId

{

[AutoIncrement]

[Alias("ShipperTypeID")]

public int Id { get; set; }

[Required]
[Index(Unique = true)]
[StringLength(40)]
public string Name { get; set; }

}

public class SubsetOfShipper

{

public int ShipperId { get; set; }

public string CompanyName { get; set; }

}

public class ShipperTypeCount

{

public int ShipperTypeId { get; set; }

public int Total { get; set; }

}

[Alias("UserAuth")]//别名
[CompositeIndex(true, "CompanyId", "UserName")]//复合索引
public class MyCustomUserAuth
{
    [AutoIncrement]
    public int Id { get; set; }
    [References(typeof(Company))]
    public int CompanyId { get; set; }
    public string UserName { get; set; }
    public string Email { get; set; }
}

---

事务的支持

var trainsType = new ShipperType { Name = "Trains" };

var planesType = new ShipperType { Name = "Planes" };

//Playing with transactions

using (IDbTransaction dbTrans = db.OpenTransaction())

{

db.Save(trainsType);

db.Save(planesType);

  dbTrans.Commit();

}

using (IDbTransaction dbTrans = db.OpenTransaction(IsolationLevel.ReadCommitted))

{

db.Insert(new ShipperType { Name = "Automobiles" });

Assert.That(db.Select(), Has.Count.EqualTo(3));

}

Assert.That(db.Select(), Has.Count(2));

修改表名

dbConn.GetDialectProvider().GetQuotedTableName(modelType.GetModelDefinition())// 获取表名(根据类获取表名)

//oldtableName 因为老表已经不存在了(即老表对应的那个类),所以只能老表名用字符串

public static void AlterTable(this IDbConnection dbConn, Type modelType, string command)

{

var person = db.SqlScalar("exec sp_name @OLDtablename, @newtablename", new { OLDtablename= "oldtableName", tablename= dbConn.GetDialectProvider().GetQuotedTableName(modelType.GetModelDefinition()) });

}

添加列

db.AddColumn(t => t.tim);

修改列名

db.ChangeColumnName(t => t.tim,"ss");

修改列

db.AlterColumn(t => t.tim);

删除列

db.DropColumn("columnName"); //Type LetterWeighting, string columnName

删除外键

db.DropForeignKey("ForeignKeyName"); //

添加外键

public enum OnFkOption

{

Cascade,

SetNull,

NoAction,

SetDefault,

Restrict

}

dbConnection.AddForeignKey<TypeWithNoForeignKeyInitially, ReferencedType>( t => t.RefId, tr => tr.Id, OnFkOption.NoAction, OnFkOption.Cascade, "FK_ADDED");

// 删除索引

db.DropIndex("IndexName"); //

//添加索引

db.CreateIndex(t => t.tim, "ss",false); // 字段,索引名 ,是否唯一索引

// 多列索引 源代码只支持在一个列上创建索引 可以加入新的扩展方法

在OrmLiteSchemaModifyApi.cs中 加入新方法

public static void CreateIndex<T>(this IDbConnection dbConn, string fields,
                                  string indexName = null, bool unique = false)
{
    var sourceMD = ModelDefinition<T>.Definition;
    string name = indexName.IsNullOrEmpty() ?
                                (unique ? "uidx" : "idx") + "_" + sourceMD.ModelName + "_" + fields.Replace(",", "").Trim() :
                                indexName;
    string command = string.Format("CREATE{0}INDEX {1} ON {2}({3});",
                                   unique ? " UNIQUE " : " ",
                                   name,
                                   sourceMD.ModelName,
                                   fields);
    dbConn.ExecuteSql(command);
}

使用

为LetterWeighting的两个列创建非聚集索引

List listField = new List();

var sourceMD = ModelDefinition.Definition;

listField.Add(sourceMD.GetFieldDefinition(t => t.Weighting).FieldName);

listField.Add(sourceMD.GetFieldDefinition(t => t.tim).FieldName);

db.CreateIndex(string.Join(",", listField.ToArray()), "ss", false);

//建议 最好动手实践下. 如果没有你需要的codefirst代码(比如如果创建索引).建议通过先在数据库里设置好(创建索引),然后通过t4模板生成,看看是否有你需要的代码(创建索引的代码)

硬货随后奉上 group having怎能没有呢