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 ();
this.Addresses = new Dictionary ();
}
[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 = "[email protected]",
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 ( 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