我创建了一个SqlMapper.TypeHandler,将Customer对象映射到CreditAccount类,如下所示:
public class CustomerTypeHandler : SqlMapper.TypeHandler<Customer>
{
public override Customer Parse(object value)
{
throw new NotImplementedException();
}
public override void SetValue(IDbDataParameter parameter, Customer
value)
{
throw new NotImplementedException();
}
}
public class CreditAccount
{
public int AccountId { get; set; }
public Customer Customer{ get; set; }
}
public class Customer
{
public string FirstName { get; set; }
public string LastName { get; set; }
public string MiddleName { get; set; }
}
当我连接到数据库并调用一个sproc时,从不调用CustomerTypeHandler Parse方法,并且我的CreditAccount对象仅填充有AccountId。 Customer对象为空。
我这样称呼它:
public async Task<CreditAccount> GetCreditAccount(int accountId)
{
var sql = "MY PROC NAME HERE";
var parameters = new DynamicParameters();
parameters.Add("@AccountId", accountId);
SqlMapper.AddTypeHandler(new CustomerTypeHandler());
using (IDbConnection connection = Connection)
{
connection.Open();
var account = await connection.QueryFirstAsync<Check>(sql, parameters, commandType: CommandType.StoredProcedure);
return account;
}
}
}
我在Parse方法中放置了一个断点,但从未调用过它。 数据库连接正常,我正在获取AccountId。
我的环境;
.NET Core 2.2
Dapper 1.50.5
代码很简单。我没有例外。有任何想法吗?
答案 0 :(得分:0)
一年过去了,现在Dapper 2.0.30中没有此错误。 我在Postgres的jsonb列上进行了检查。
using Dapper;
using Newtonsoft.Json;
using Npgsql;
using System;
using System.Data;
public class CreditAccount
{
public int AccountId { get; set; }
public Customer Customer { get; set; }
}
public class Customer
{
public string FirstName { get; set; }
public string LastName { get; set; }
public string MiddleName { get; set; }
}
public class CustomerJsonObjectTypeHandler : SqlMapper.TypeHandler<Customer>
{
public override void SetValue(IDbDataParameter parameter, Customer value)
{
parameter.Value = (value == null)
? (object)DBNull.Value
: JsonConvert.SerializeObject(value);
parameter.DbType = DbType.String;
}
public override Customer Parse(object value)
{
return JsonConvert.DeserializeObject<Customer>(value.ToString());
}
}
使用此类的示例-一切正常。
static void Main(string[] args)
{
using (var connection = GetDefaultConnection())
{
connection.Open();
var customer = new Customer
{
FirstName = "Gaday",
LastName = "Ivanova",
MiddleName = "Petrovich"
};
var jsonData = JsonConvert.SerializeObject(customer);
var strQuery = $"SELECT 10500 as AccountId,'{jsonData}'::jsonb as Customer";
SqlMapper.AddTypeHandler(new CustomerJsonObjectTypeHandler());
try
{
var data = connection.QueryFirst<CreditAccount>(strQuery);
}
catch(Exception ex)
{
Console.WriteLine(ex.Message);
}
}
}