我有实体“点”,其中包含Id,文本和地理坐标。映射SqlGeography与Dapper
CREATE TABLE [Point] (
[Id] INT IDENTITY CONSTRAINT [PK_Point_Id] PRIMARY KEY,
[Coords] GEOGRAPHY NOT NULL,
[Text] NVARCHAR(32) NOT NULL,
[CreationDate] DATETIME NOT NULL,
[IsDeleted] BIT NOT NULL DEFAULT(0)
)
CREATE PROCEDURE [InsertPoint]
@text NVARCHAR(MAX),
@coords GEOGRAPHY
AS BEGIN
INSERT INTO [Point](Text, Coords, CreationDate)
VALUES(@text, @coords, GETUTCDATE())
SELECT * FROM [Point] WHERE [Id] = SCOPE_IDENTITY()
END
这是ts sql代码表和存储过程的插入。我有类使用短小精悍:
public class DapperRequester : IDisposable {
private readonly SqlConnection _connection;
private SqlTransaction _transaction;
public DapperRequester(string connectionString) {
_connection = new SqlConnection(connectionString);
_connection.Open();
}
public void Dispose() {
_connection.Close();
}
public void BeginTransaction() {
_transaction = _connection.BeginTransaction();
}
public void CommitTransaction() {
_transaction.Commit();
}
public void RollbackTransaction() {
_transaction.Rollback();
}
public void Query(string query, object parameters = null) {
Dapper.SqlMapper.Execute(_connection, query, parameters, transaction: _transaction);
}
public void QueryProc(string procName, object parameters = null) {
Dapper.SqlMapper.Execute(_connection, procName, parameters, commandType: CommandType.StoredProcedure, transaction: _transaction);
}
public IEnumerable<T> Execute<T>(string query, object parameters = null) {
return Dapper.SqlMapper.Query<T>(_connection, query, parameters, transaction: _transaction);
}
public IEnumerable<dynamic> ExecuteProc(string procName, object parameters = null) {
return Dapper.SqlMapper.Query(_connection, procName, parameters,
commandType: CommandType.StoredProcedure, transaction: _transaction);
}
public IEnumerable<T> ExecuteProc<T>(string procName, object parameters = null) {
return Dapper.SqlMapper.Query<T>(_connection, procName, parameters,
commandType: CommandType.StoredProcedure, transaction: _transaction);
}
}
C#-class是:
public class Point
{
public int Id { get; set; }
public SqlGeography Coords { get; set; }
public string Text { get; set; }
}
和存储库有方法
public Point InsertPoint(string text, SqlGeography coords)
{
using (var requester = GetRequester())
{
return requester.ExecuteProc<Point>("InsertPoint", new { text, coords }).FirstOrDefault();
}
}
当我使用任何其他类这样的系统,一切都好,但映射有问题,我认为这是因为SqlGeography类型。使用:
SqlGeography coords = new SqlGeography();
coords = SqlGeography.Point(10.5, 15.5, 4326);
Point point = new Point { Coords = coords, Text = "Text" };
point = Repositories.PointRepository.InsertPoint(point.Text, point.Coords);
我有个例外The member coords of type Microsoft.SqlServer.Types.SqlGeography cannot be used as a parameter value
是否有一些映射该类型的秘密?
它是否也应该与QueryMultiple一起使用?阅读时出现“解析第5列”错误。第5列是一个SqlGeography多边形。 –
请注意根据您使用的ms数据库版本使用正确版本的SqlGeography。我必须为Sql 2012安装SqlGeography Version 10.5。然后,它与Dapper一起运行良好。 – mac10688