我正在用 C# 编写一个项目，我使用 ADO.NET 连接到我的 SQL Server 2012 数据库。我的数据库（除其他外）有两列。第一列代表一个点的纬度，第二列代表经度。我使用一个程序来检查地图上的两个矩形是否相互截取。列回复返回 1 个值，即 0 或 1。 编辑：在此示例中，我仅使用数字运行它，我计划稍后添加变量，如果我在 SQL 查询上运行它，我的过程可以正常工作。但是如果我使用 ADO.net 运行会出现错误
因为 SQL 查询过程是：
DECLARE @g geography;
DECLARE @h geography;
DECLARE @s geography;
SET @g = geography::STGeomFromText('POLYGON((39.692 23.483, 23.483 39.671, 24.095 39.493, 23.466 39.800,39.692 23.483))', 4326);
SET @h = geography::STGeomFromText('POLYGON((39.800096 23.296509, 39.628961 23.128967,39.43195 23.510742 ,39.7093 23.859558,39.800096 23.296509))', 4326);
SET @h =@h.MakeValid();
SET @g = @g.MakeValid();
SELECT @g.STIntersects(@h) as reply
/*================================================= ==================================================== =============
//------------------------ AS ADO.NET 程序是 : ----- --------------
SqlDataReader rdr = null;
SqlConnection conn = new SqlConnection("Data Source=AGIS-PC;Initial Catalog=ship_maps;Integrated Security=True");// create a connection object
String commandString = @"DECLARE @g geography;
DECLARE @h geography;
DECLARE @s geography;
SET @h =@h.MakeValid();
SET @g = @g.MakeValid();
SET @g = geography::STGeomFromText('POLYGON((39.692 23.483, 23.483 39.671, 24.095 39.493, 23.466 39.800,39.692 23.483))', 4326);
SET @h = geography::STGeomFromText('POLYGON((39.800096 23.296509, 39.628961 23.128967,39.43195 23.510742 ,39.7093 23.859558,39.800096 23.296509))', 4326);
SET @h =@h.MakeValid();
SET @g = @g.MakeValid();
SELECT @g.STIntersects(@h) as reply";
SqlCommand cmd = new SqlCommand(commandString, conn);
try
{
// open the connection
conn.Open();
// 1. get an instance of the SqlDataReader
rdr = cmd.ExecuteReader();
while (rdr.Read())
{
// get the results of each column
string vessel_name = (string)rdr["reply"];
TextBox1.Text += " " + vessel_name;
// .....
}//while
}
finally
{
//...........
}
//================================================= ========= 我猜他的错误是 makevalid() 。我在 sql 的初始查询中遇到了类似的错误，然后我插入 makevalid() 并且它起作用了。编辑：它发生在 rdr = cmd.ExecuteReader();
Stack Trace:
[SqlException (0x80131904): A .NET Framework error occurred during execution of user-defined routine or aggregate "geography":
System.ArgumentException: 24200: The specified input does not represent a valid geography instance. Use MakeValid to convert the instance to a valid instance. Note that MakeValid may cause the points of a spatial instance to shift slightly.
System.ArgumentException:
at Microsoft.SqlServer.Types.SqlGeography..ctor(GeoData g, Int32 srid)
at Microsoft.SqlServer.Types.SqlGeography.GeographyFromText(OpenGisType type, SqlChars taggedText, Int32 srid)
.
A .NET Framework error occurred during execution of user-defined routine or aggregate "geography":
Microsoft.SqlServer.Types.GLArgumentException: 24205: The specified input does not represent a valid geography instance because it exceeds a single hemisphere. Each geography instance must fit inside a single hemisphere. A common reason for this error is that a polygon has the wrong ring orientation. To create a larger than hemisphere geography instance, upgrade the version of SQL Server and change the database compatibility level to at least 110.
Microsoft.SqlServer.Types.GLArgumentException:
at Microsoft.SqlServer.Types.GLNativeMethods.GeodeticIsValid(GeoData& g, Double eccentricity, Boolean forceKatmai)
at Microsoft.SqlServer.Types.SqlGeography.IsValidExpensive(Boolean forceKatmai)
at Microsoft.SqlServer.Types.SqlGeography..ctor(GeoData g, Int32 srid)
at Microsoft.SqlServer.Types.SqlGeography.GeographyFromText(OpenGisType type, SqlChars taggedText, Int32 srid)
.]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +2084358
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +5096328
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() +234
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +2294
System.Data.SqlClient.SqlDataReader.ConsumeMetaData() +33
System.Data.SqlClient.SqlDataReader.get_MetaData() +86
System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +311
System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) +987
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) +162
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +32
System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +141
System.Data.SqlClient.SqlCommand.ExecuteReader() +89
gmaps.Button11_Click(Object sender, EventArgs e) +185
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +118
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +112
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5563
请告知，或者如果这是另一个主题，请告诉我。我是 SQL 初学者
