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FreeSql 扩展包，将值对象映射成 typeof(string)，安装扩展包：
dotnet add package FreeSql.Extensions.JsonMap
fsql.UseJsonMap(); //开启功能
class TestConfig
{
public int clicks { get; set; }
public string title { get; set; }
}
[Table(Name = "sysconfig")]
public class S_SysConfig<T>
{
[Column(IsPrimary = true)]
public string Name { get; set; }
[JsonMap]
public T Config { get; set; }
}