Add LENGTH support #986

mbdavid · May 21, 2018 · 49163e1 · 49163e1
1 parent 5c596cb
commit 49163e1
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Showing 4 changed files with 63 additions and 4 deletions.
diff --git a/LiteDB.Shell/Properties/launchSettings.json b/LiteDB.Shell/Properties/launchSettings.json
@@ -2,7 +2,7 @@
   "profiles": {
     "LiteDB.Shell": {
       "commandName": "Project",
-      "commandLineArgs": "C:\\Temp\\app.db"
+      "commandLineArgs": "bin/Debug/net40/Game.db"
     }
   }
 }
diff --git a/LiteDB.Shell/Shell/ShellProgram.cs b/LiteDB.Shell/Shell/ShellProgram.cs
@@ -28,7 +28,7 @@ public static void Start(InputCommand input, Display display)
 
                 if (string.IsNullOrEmpty(cmd)) continue;
 
-                try
+                //try
                 {
                     var s = new StringScanner(cmd);
 
@@ -51,9 +51,9 @@ public static void Start(InputCommand input, Display display)
                         display.WriteResult(env.Engine.Run(cmd));
                     }
                 }
-                catch (Exception ex)
+                //catch (Exception ex)
                 {
-                    display.WriteError(ex);
+                    //display.WriteError(ex);
                 }
             }
         }

diff --git a/LiteDB.Tests/Engine/Delete_Query_Tests.cs b/LiteDB.Tests/Engine/Delete_Query_Tests.cs
@@ -0,0 +1,45 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Collections;
+using System.Collections.Generic;
+using System.Text;
+
+namespace LiteDB.Tests.Engine
+{
+    [TestClass]
+    public class Delete_Query_Tests
+    {
+        [TestMethod]
+        public void Delete_Query()
+        {
+            using (var file = new TempFile())
+            {
+                var initial = new DateTime(2000, 01, 01);
+
+                using (var db = new LiteEngine(file.Filename))
+                {
+                    for(var i = 0; i < 5000; i++)
+                    {
+                        db.Insert("col", new BsonDocument { { "dt", initial.AddDays(i) } });
+                    }
+
+                    db.EnsureIndex("col", "dt");
+
+                    Assert.AreEqual(5000, db.Count("col"));
+
+                    Assert.AreEqual(0, db.Count("col", Query.GT("dd", initial)));
+
+                    var del = db.Delete("col", Query.GT("dd", initial));
+
+                    Assert.AreEqual(0, del);
+
+                    Assert.AreEqual(0, db.Count("col", Query.GT("dd", initial)));
+
+                }
+            }
+        }
+    }
+}
diff --git a/LiteDB/Document/Expression/Methods/Misc.cs b/LiteDB/Document/Expression/Methods/Misc.cs
@@ -33,5 +33,19 @@ public static IEnumerable<BsonValue> IIF(IEnumerable<BsonValue> condition, IEnum
                 yield return value.First.AsBoolean ? value.Second : value.Third;
             }
         }
+
+        /// <summary>
+        /// Return length of variant value (valid only for String, Binary, Array or Document [keys])
+        /// </summary>
+        public static IEnumerable<BsonValue> LENGTH(IEnumerable<BsonValue> values)
+        {
+            foreach (var value in values)
+            {
+                if (value.IsString) yield return value.AsString.Length;
+                else if (value.IsBinary) yield return value.AsBinary.Length;
+                else if (value.IsArray) yield return value.AsArray.Count;
+                else if (value.IsDocument) yield return value.AsDocument.Keys.Count;
+            }
+        }
     }
 }