关于Dapper的使用笔记2

1 在实体定义中标示字段名：

public class t_SoDtl
{
    [System.ComponentModel.Description("KeySeq")]
    public Guid ID { get; set; } //数据库中的列名KeySeq

    [System.ComponentModel.Description("SoKeySeq")]
    public Guid SoKeySeq { get; set; }

    [System.ComponentModel.Description("ItemId")]
    public string ItemNo { get; set; }

    [System.ComponentModel.Description("ItemName")]
    public string ItemName { get; set; }

    [System.ComponentModel.Description("Price")]
    public decimal Price { get; set; }

    [System.ComponentModel.Description("Qty")]
    public decimal Quality { get; set; }//数据库中的列名Qty

    [System.ComponentModel.Description("Amount")]
    public decimal Amount { get; set; }
}

2、建立自定义映射 SqlMapper.ITypeMap ---> CustomPropertyTypeMap

var map = new CustomPropertyTypeMap(typeof(t_SoDtl),
(type, columnName) => type.GetProperties()
    .Where(prop => prop.GetCustomAttributes(false).OfType<DescriptionAttribute>().Any(attr => attr.Description == columnName)) //找出Decsription = Column的属性
    .FirstOrDefault());

Dapper.SqlMapper.SetTypeMap(typeof(t_SoDtl), map);

3、效果测试

//查询
DbConnection con = this.GetConnection();
return con.Query<t_SoDtl>("select * from dbo.t_SoDtl where SoKeySeq = @SoKeySeq", new {SoKeySeq = soKeySeq}).ToList();

//插入 (注意参数的名称与实体属性的对应)
string strSQL = @"
INSERT INTO dbo.t_so(KeySeq,SoNo,SoDate,CustomerName,Remark)
VALUES(@KeySeq,@SoNo,@SoDate,@CustomerName,@Remark)";

DbConnection con = this.GetConnection();
//con.Execute(strSQL, new {KeySeq = so.KeySeq, SoNo = so.SoNo, SoDate = so.SoDate, CustomerName = so.CustomerName, Remark = so.Remark});
con.Execute(strSQL, so);