Added versions functions for full PostGIS and GEOS versions

Author: apdevelop

LinqToDBPostGisNetTopologySuite.Tests/GeometryProcessingTests.cs

@@ -346,7 +346,10 @@ public void TestSTReducePrecision()
             {
                 // TODO: ? Some helper version classes / attributes for methods?
                 var version = new Version(db.Select(() => VersionFunctions.PostGISLibVersion()));
-                if (version >= new Version("3.1.0")) // TODO: ? const
+                var geos = db.Select(() => VersionFunctions.PostGISGEOSVersion());
+                var geosVersion = geos != null ? new Version(geos.Substring(0, geos.IndexOf('-'))) : null;
+
+                if ((version >= new Version("3.1.0")) && (geosVersion != null) && (geosVersion >= new Version("3.9"))) // TODO: ? const
                 {
                     const string Wkt = "POINT(1.412 19.323)";
 

LinqToDBPostGisNetTopologySuite.Tests/VersionFunctionsTests.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Linq;
+
+using LinqToDB;
+using NUnit.Framework;
+
+namespace LinqToDBPostGisNetTopologySuite.Tests
+{
+    [TestFixture]
+    class VersionFunctionsTests : TestsBase
+    {
+        [Test]
+        public void TestPostGISFullVersion()
+        {
+            using (var db = new PostGisTestDataConnection(TestDatabaseConnectionString))
+            {
+                var fullVersion = db.Select(() => VersionFunctions.PostGISFullVersion());
+                Assert.IsNotNull(fullVersion);
+
+                // Just to see in test runner output
+                Console.WriteLine(new String('-', 40));
+                Console.WriteLine(fullVersion);
+                Console.WriteLine(new String('-', 40));
+            }
+        }
+    }
+}

LinqToDBPostGisNetTopologySuite/VersionFunctions.cs

@@ -12,6 +12,36 @@ namespace LinqToDBPostGisNetTopologySuite
     /// </remarks>
     public static class VersionFunctions
     {
+        /// <summary>
+        /// Returns full PostGIS version and build configuration information.
+        /// </summary>
+        /// <remarks>
+        /// See https://postgis.net/docs/PostGIS_Full_Version.html
+        /// </remarks>
+        /// <returns>
+        /// Full PostGIS version and build configuration information.
+        /// </returns>
+        [Sql.Function("PostGIS_Full_Version", ServerSideOnly = true)]
+        public static string PostGISFullVersion()
+        {
+            throw new InvalidOperationException();
+        }
+
+        /// <summary>
+        /// Returns the version number of the GEOS library, or null if GEOS support is not enabled.
+        /// </summary>
+        /// <remarks>
+        /// See https://postgis.net/docs/PostGIS_GEOS_Version.html
+        /// </remarks>
+        /// <returns>
+        /// Version number of the GEOS library.
+        /// </returns>
+        [Sql.Function("PostGIS_GEOS_Version", ServerSideOnly = true)]
+        public static string PostGISGEOSVersion()
+        {
+            throw new InvalidOperationException();
+        }
+
         /// <summary>
         /// Returns the version number of the PostGIS library.
         /// </summary>