Question

我无法在Entity框架中执行Raw Sql Where查询。

型号：

public partial class Web_User_Setup_Header
{
    public byte[] timestamp { get; set; }
    public string User_ID { get; set; }
    public bool Enable { get; set; }
    public System.DateTime Expiration_Date { get; set; }
}

Fluent Model Entity Configuraiton：

public class Web_User_Setup_HeaderConfigruation : EntityTypeConfiguration<Web_User_Setup_Header>
{
    public Web_User_Setup_HeaderConfigruation()
    {
        ToTable("Web User Setup Header");
        HasKey(x => x.User_ID).Property(x => x.User_ID).HasColumnName("User ID");
        Property(x => x.Expiration_Date).HasColumnName("Expiration Date");
    }
}

我正在执行的Sql查询是：

 Web_User_Setup_Header WebSetup = context.Web_User_Setup_Headers.SqlQuery("Select * from [" + Convert.ToString(HttpContext.Items["Company"]) +
                 "$Web User Setup Header] where User_ID=@p0", uid).SingleOrDefault();

其中HttpContext.Items["Company"] = "Sachin Sales"

和uid = "web"

当我执行上述查询时，它会给出错误：Invalid column name 'User_ID'.

当我在查询中将User_ID更改为[User ID]时，它会将错误描述为：

The data reader is incompatible with the specified 'JSTestWeb.Models.Web_User_Setup_Header'. A member of the type, 'User_ID', does not have a corresponding column in the data reader with the same name.

有人能说清楚这件事吗？但是，数据库字段名称仅在数据库中为[User ID]，我无法更改它。

Answer 1

您可以使用ESQL构建动态查询。但是您需要使用ObjectContext API来执行ESQL。

public class MyContextTest : DbContext
{
    public virtual ObjectContext UnderlyingObjectContext
    {
        get
        {
            return ((IObjectContextAdapter)this).ObjectContext;
        }
    }
}

查询语法与SQL略有不同。

 Web_User_Setup_Header WebSetup = context.UnderlyingObjectContext
    .CreateQuery<Web_User_Setup_Header>("Select VALUE C from [" +    
     Convert.ToString(HttpContext.Items["Company"]) +
     "$Web User Setup Header] AS C where C.[User ID]=@p0", 
        new ObjectParameter("p0", uid)).SingleOrDefault();

无法执行Context.Entity.SqlQuery实体框架

1 个答案: