(转)fast dapper 用法

refs:

http://dapper-tutorial.net/dapper-fastcrud

https://github.com/MoonStorm/Dapper.FastCRUD/wiki

部分更新

https://github.com/MoonStorm/Dapper.FastCRUD/wiki/Multiple-mappings

 

老是要去查表，主要对参数理解不够，故转此文。

 

//按主键查找
var invoice = connection.Get(new Invoice { Id = 1 });
//查找所有
var list = connection.Find();
//按条件查找
var target=connection.Find(statement => statement  
                .Where($"{nameof(Entity.FirstName):C}=@FirstNameParam")  
                .OrderBy($"{nameof(Entity.LastName):C} DESC")  
                .Skip(10)  
                .Top(20)  
                .WithParameters(new {FirstNameParam = "John"});

connection.Insert(new Invoice { Kind = InvoiceKind.WebInvoice, Code = "Insert_Single_1" });

invoice.Code = "Updated_invoice";
invoice.Kind = InvoiceKind.WebInvoice;

var status = connection.Update(invoice);

var isDeleted = connection.Delete(new Invoice { Id = 2 });

var count = connection.Count();

注意：

1)用指令

dbConnection.Update(updatedEntity);   

dbConnection.BulkUpdate(new Asset {IsLost = true}, statement => statement  
      .Where($"{nameof(Asset.Name):C}='Unknown'"));

更新时，更新的是所有字段，如updatedEntity，而Asset除了IsLost字段外他字段会被设置为null；如果只想更新目标字段，可以用如下方式：(见refs)

var partialUpdateMapping = OrmConfiguration
    .GetDefaultEntityMapping()
    .Clone()
    .RemoveAllPropertiesExcluding(nameof(Business.Name));


如果是多个字段
 var partialSetMapping = OrmConfiguration
      .GetDefaultEntityMapping()
      .Clone() // clone it if you don't want to modify the default
      .RemoveAllPropertiesExcluding(
                            nameof(CompanyInformation.Id),
                            nameof(CompanyInformation.Email),
                            nameof(CompanyInformation.Phone),
                            nameof(CompanyInformation.Name));

除了Name字段，其他的排除掉，更新时带上WithEntityMappingOverride参数。

 databaseConnection.BulkUpdate(new Business { Name = newName}, statement => statement
    .Where($"{nameof(Business.Name):C} LIKE '{keyword}%'")
    // .WithParameters(new { keyword }) no need for this since it's not used
    .WithEntityMappingOVerride(partialUpdateMapping));