[英]Use SqlGeography at ServiceStack.OrmLite in .Net Core
I try to add SqlGeography to my model and when I call create table I got weird error. 我尝试将SqlGeography添加到我的模型中,当我调用create table时出现奇怪的错误。
First I add this package: Microsoft.SqlServer.Types
首先,我添加以下程序包:
Microsoft.SqlServer.Types
Then I create my model like example at below: 然后在下面创建我的模型,例如下面的示例:
public class Locations
{
public int Id { get; set; }
public string Name { get; set; }
public SqlGeography Location { get; set; }
}
Then call CreateTableIfNotExists
to create table 然后调用
CreateTableIfNotExists
创建表
private void CheckDB(IDbConnectionFactory dbConnectionFactory)
{
using (var db = dbConnectionFactory.Open())
{
db.CreateTableIfNotExists<Models.Entities.DbIpEntity>();
}
}
And at end I got this error: 最后我得到了这个错误:
System.TypeLoadException HResult=0x80131522 Message=Could not load type 'Microsoft.SqlServer.Server.IBinarySerialize' from assembly 'System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
System.TypeLoadException HResult = 0x80131522消息=无法从程序集“ System.Data,版本= 4.0.0.0,区域性=中性,PublicKeyToken = b77a5c561934e089”中加载类型“ Microsoft.SqlServer.Server.IBinarySerialize”。 Source=System.Private.CoreLib
来源= System.Private.CoreLib
StackTrace: at System.Signature.GetSignature(Void* pCorSig, Int32 cCorSig, RuntimeFieldHandleInternal fieldHandle, IRuntimeMethodInfo methodHandle, RuntimeType declaringType) at System.Reflection.RuntimeMethodInfo.FetchNonReturnParameters() at System.Reflection.RuntimeMethodInfo.GetParametersNoCopy() at System.Reflection.RuntimePropertyInfo.GetIndexParametersNoCopy() at System.Reflection.RuntimePropertyInfo.GetIndexParameters() at ServiceStack.OrmLite.OrmLiteConfigExtensions.GetModelDefinition(Type modelType) at ServiceStack.OrmLite.OrmLiteWriteCommandExtensions.CreateTable(IDbCommand dbCmd, Boolean overwrite, Type modelType) at ServiceStack.OrmLite.OrmLiteExecFilter.Exec[T](IDbConnection dbConn, Func`2 filter) at ServiceStack.OrmLite.OrmLiteSchemaApi.DropAndCreateTable[T](IDbConnection dbConn) at GeoApi.AppHost.CheckDB(IDbConnectionFactory dbConnectionFactory) in E:\\Projects\\Geo\\AppHost.cs:line 48 at GeoApi.AppHost.Configure(Container container) in E:\\Projects\\Geo\\AppHost.cs:line 40 aStackTrace:在System.Reflection.RuntimeMethodInfo.GetParameters。在ServiceStack.OrmLite.OrmLite.OrmLite.OrmLiteWriteCommandExtensions.CreateTable(IDbCommand dbCmd,在布尔值覆盖。在类型为TypeType的ServiceType。 E:\\ Projects \\ Geo \\ AppHost中的GeoApi.AppHost.CheckDB(IDbConnectionFactory dbConnectionFactory)中的ServiceStack.OrmLite.OrmLiteSchemaApi.DropAndCreateTable [T](IDbConnection dbConn)中的OrmLiteExecFilter.Exec [T](IDbConnection dbConn,Func`2筛选器)。在E:\\ Projects \\ Geo \\ AppHost.cs:line 40 a中的GeoApi.AppHost.Configure(容器容器)处的cs:line 48 t ServiceStack.ServiceStackHost.Init() at ServiceStack.NetCoreAppHostExtensions.UseServiceStack(IApplicationBuilder app, AppHostBase appHost) at GeoApi.Startup.Configure(IApplicationBuilder app, IHostingEnvironment env) in E:\\Projects\\Geo\\Startup.cs:line 49
t E:\\ Projects \\ Geo \\ Startup.cs:line 49中ServiceStack.NetCoreAppHostExtensions.UseServiceStack(IApplicationBuilder app,AppHostBase appHost)的ServiceStack.ServiceStackHost.Init()在GeoApi.Startup.Configure(IApplicationBuilder app,IHostingEnvironment env)
In this error I realized it's looking for .Net Framework assembly ( System.Data, Version=4.0.0.0
) not .Net Core 在此错误中,我意识到它正在寻找.Net Framework程序集(
System.Data, Version=4.0.0.0
),而不是.Net Core
定义SqlGeography
的ServiceStack.OrmLite.SqlServer.Converters和Microsoft.SqlServer.Types分别仅适用于.NET v4.5和.NET v4.0,因此它至少需要运行.NET v4.5才能运行。不能在.NET Core中使用。
.net core 2.2 now supports working with GeoSpatial data - https://docs.microsoft.com/en-us/ef/core/modeling/spatial .NET 2.2的核心现在支持地理空间数据的工作- https://docs.microsoft.com/en-us/ef/core/modeling/spatial
I was able to knock together my own OrmLiteConverter based around the SqlServerGeographyTypeConverter here. 我可以根据SqlServerGeographyTypeConverter将自己的OrmLiteConverter组合在一起。
public class SqlServerIPointTypeConverter : OrmLiteConverter
{
public override string ColumnDefinition => "geography";
public override DbType DbType => DbType.Object;
public override string ToQuotedString(Type fieldType, object value)
{
if (fieldType != typeof(IPoint)) return base.ToQuotedString(fieldType, value);
string str = null;
if (value != null)
{
var geo = (IPoint) value;
str = geo.ToString();
}
str = (str == null) ? "null" : $"'{str}'";
return $"CAST({str} AS {ColumnDefinition})";
}
public override void InitDbParam(IDbDataParameter p, Type fieldType)
{
if (fieldType == typeof(IPoint))
{
var sqlParam = (SqlParameter)p;
sqlParam.IsNullable = fieldType.IsNullableType();
sqlParam.SqlDbType = SqlDbType.Udt;
sqlParam.UdtTypeName = ColumnDefinition;
}
base.InitDbParam(p, fieldType);
}
public override object FromDbValue(Type fieldType, object value)
{
switch (value)
{
case null:
case DBNull _:
return new Point(0, 0);
case IPoint point:
return point;
case string _:
return Parse(value.ToString());
default:
return base.FromDbValue(fieldType, value);
}
}
public override object ToDbValue(Type fieldType, object value)
{
switch (value)
{
case null:
case DBNull _:
return new Point(0, 0);
case IPoint _:
return value;
case string str:
return Parse(str);
default:
return base.ToDbValue(fieldType, value);
}
}
private static Point Parse(string rawPoint)
{
var split = rawPoint.Replace("POINT (", string.Empty)
.Replace(")", string.Empty)
.Trim()
.Split(new[] { " " }, StringSplitOptions.RemoveEmptyEntries);
var longitude = Convert.ToDouble(split[0]);
var latitude = Convert.ToDouble(split[1]);
return new Point(longitude, latitude);
}
}
Then in your AppHost file: 然后在您的AppHost文件中:
SqlServerDialect.Provider.RegisterConverter<Point>(new SqlServerIPointTypeConverter());
As long as you are on dotnet core 2.2, and have the following Nuget packages referenced, it should work: 只要您使用的是dotnet core 2.2,并引用了以下Nuget程序包,它就可以工作:
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