codefirst configuration

codefirst 书写配置类，用于entity与数据库中表或view映射

1、对应表或视图都用this.ToTable("SimpleCompanyLoanView", "dbo");  dbo为schema

2、配置主键。尤其是视图需要有特定识别的“主键”，不然报错，实在没有可以在创建视图时加行号。用this.hasKey，如果是联合主键是new{A，B}。this.HasKey(m => new{m.CompanyNo,m.CurrentYear,m.CurrentMonth});

3、配置具体字段 this.Property(m => m.CompanyName);

4、忽略字段（即entity中个别字段不在数据库表中）   this.Ignore(m=>m.Name);

public SimpleCompanyLoanViewConfiguration()
{
this.ToTable("SimpleCompanyLoanView", "dbo");
this.HasKey(m => new{m.CompanyNo,m.CurrentYear,m.CurrentMonth});
this.Property(m => m.CompanyName);
this.Property(m => m.CompanyNo);
this.Property(m => m.FirstBankName);
this.Property(m => m.SecondBankName);
this.Property(m => m.FirstLoanAmount);
this.Property(m => m.SecondLoanAmount);
this.Property(m => m.LoanAmountSum);

this.Ignore(m=>m.Name);

}