entity-framework - Dapper 扩展 dbConnection.Get

Question

Problem with: Dapper Extensions dbConnection.Get(personId)

I have a model called Person:

Person
{
    public int PersonId { get; set; }
    public string Name { get; set; }
}

In the database I have this table:

data.Persons
    Pers_Id
    Pers_Name

When I try this without any kind of custom mapping, I get an error "Invalid object name 'Person'." I believe this is a mapping issue, because when I completely map the model with the prefix 'Pers_', and use 'data.Persons' Get works.

But is there a way to automatically map with a prefix? The database I'm using has many different tables with different prefices.

I also have everything already mapped to Entity framework. Is there a possibility of getting the map settings from Entity DbModelBuilder?

score 1 · Accepted Answer

Dapper-Extensions 是基于约定的。对于架构，它使用 .dbo，而对于主键，它使用 Id。如果您的表不符合约定，则必须创建自定义映射。

public class MyModelMapper : ClassMapper<MyModel>
{
    public MyModelMapper()
    {

        //use different table name
        Table("table_name");

        //use a custom schema
        Schema("not_dbo_schema"); 

        //have a custom primary key
        Map(x => x.ThePrimaryKey).Key(KeyType.Assigned);

        //Use a different name property from database column
        Map(x=> x.Foo).Column("Bar");

        //Ignore this property entirely
        Map(x=> x.SecretDataMan).Ignore();

        //optional, map all other columns
        AutoMap();
    }
}

另一种方法是使用 Dapper 并编写您的内联查询：

connection.Query("select * from foo.table where myId = {myId}", new {myId})

更新：

另一种选择是使用代码生成和 T4 文本模板

这是一个简单的例子

entity-framework - Dapper 扩展 dbConnection.Get

MS Access Project 2007 SP3 slow performance

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MS Access Project 2007 SP3 slow performance

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