C# 将字符串作为几何图形保存到数据库

Question

现在我们正在获取字符串形式的几何数据，我们需要将其作为几何类型保存到我们的 SQL 数据库中。

目前，我正在尝试做一些看起来像这样的事情

String shape = "POLYGON((0 0, 150 0, 150 150, 0 150, 0 0))" ;
String insertSQL = "INSERT INTO x (shape) values (@shape)";

SqlCommand cmd = new SqlCommand(insertSql, sqlConnection);
cmd.CommandType = System.Data.Text;

cmd.Parameters.AddWithValue("@shape", "geometry::Parse("+shape+")");

cmd.ExecuteNonQuery();

每次执行查询时都会出现错误：

{"A .NET Framework error occurred during execution of user-defined routine or aggregate "geometry":

System.FormatException: 24114: The label geometry::Parse('POL in the input well-known text (WKT) is not valid. Valid labels are POINT, LINESTRING, POLYGON, MULTIPOINT, MULTILINESTRING, MULTIPOLYGON, GEOMETRYCOLLECTION, CIRCULARSTRING, COMPOUNDCURVE, CURVEPOLYGON and FULLGLOBE (geography Data Type only).

System.FormatException:

at Microsoft.SqlServer.Types.OpenGisTypes.ParseLabel(String input) at Microsoft.SqlServer.Types.WellKnownTextReader.ParseTaggedText(OpenGisType type) at Microsoft.SqlServer.Types.WellKnownTextReader.Read(OpenGisType type, Int32 srid) at Microsoft.SqlServer.Types.SqlGeometry.GeometryFromText(OpenGisType type, SqlChars text, Int32 srid) at Microsoft.SqlServer.Types.SqlGeometry.Parse(SqlString s).

The statement has been terminated."}

有没有办法在不导入 SQL SERVER Types 包的情况下在本机完成此操作？或者是实现此目的的唯一方法是包含 Nuget 包并从那里开始？

Answer 1

SQL 查询中的参数用于防止 SQL 注入 - 这意味着您在查询参数中包含的任何内容都将被视为数据以外的任何内容，不会对其进行评估，所以 geometry::Parse 不会运行。尝试这样的事情：

String shape = "POLYGON((0 0, 150 0, 150 150, 0 150, 0 0))" ;
String insertSQL = "INSERT INTO x (shape) values (geometry::Parse(@shape))";

SqlCommand cmd = new SqlCommand(insertSql, sqlConnection);
cmd.CommandType = System.Data.Text;

cmd.Parameters.AddWithValue("@shape", shape);

cmd.ExecuteNonQuery();

C# 将字符串作为几何图形保存到数据库

C# Save String To Database As Geometry

c#

sql

sql-server

geometry