From f1737ac6145f3954b823a5d61a82521c78512d3f Mon Sep 17 00:00:00 2001
From: Martin Pum <m.pum@cubido.at>
Date: Fri, 3 Jun 2016 12:05:28 +0200
Subject: [PATCH] Added support for REPLACE-function in WHERE-clause

---
 src/SQLite.Net/TableQuery.cs |  4 +++
 tests/ReplaceTest.cs         | 63 ++++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 tests/ReplaceTest.cs

diff --git a/src/SQLite.Net/TableQuery.cs b/src/SQLite.Net/TableQuery.cs
index 588881a26..96c4f989a 100644
--- a/src/SQLite.Net/TableQuery.cs
+++ b/src/SQLite.Net/TableQuery.cs
@@ -432,6 +432,10 @@ private CompileResult CompileExpr([NotNull] Expression expr, List<object> queryA
                 {
                     sqlCall = "(upper(" + obj.CommandText + "))";
                 }
+                else if (call.Method.Name == "Replace" && args.Length == 2)
+                {
+                    sqlCall = "(replace(" + obj.CommandText + ", " + args[0].CommandText + ", " + args[1].CommandText + "))";
+                }
                 else
                 {
                     sqlCall = call.Method.Name.ToLower() + "(" +
diff --git a/tests/ReplaceTest.cs b/tests/ReplaceTest.cs
new file mode 100644
index 000000000..5674d5bec
--- /dev/null
+++ b/tests/ReplaceTest.cs
@@ -0,0 +1,63 @@
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using SQLite.Net.Attributes;
+using SQLite.Net.Interop;
+
+namespace SQLite.Net.Tests
+{
+    [TestFixture]
+    public class ReplaceTest
+    {
+        public class TestObj
+        {
+            [AutoIncrement, PrimaryKey]
+            public int Id { get; set; }
+
+            public string Name { get; set; }
+
+            public override string ToString()
+            {
+                return string.Format("[TestObj: Id={0}, Name={1}]", Id, Name);
+            }
+        }
+
+        public class TestDb : SQLiteConnection
+        {
+            public TestDb(ISQLitePlatform sqlitePlatform, string path)
+                : base(sqlitePlatform, path)
+            {
+                CreateTable<TestObj>();
+            }
+        }
+
+
+        [Test]
+
+        public void ReplaceInWhere()
+        {
+            string testElement = "Element";
+            string alternateElement = "Alternate";
+            string replacedElement = "ReplacedElement";
+
+            int n = 20;
+            IEnumerable<TestObj> cq = from i in Enumerable.Range(1, n)
+                                      select new TestObj
+                                      {
+                                          Name = (i % 2 == 0) ? testElement : alternateElement
+                                      };
+
+            var db = new TestDb(new SQLitePlatformTest(), TestPath.CreateTemporaryDatabase());
+
+            db.InsertAll(cq);
+
+            db.TraceListener = DebugTraceListener.Instance;
+
+
+            List<TestObj> result = (from o in db.Table<TestObj>() where o.Name.Replace(testElement, replacedElement) == replacedElement select o).ToList();
+            Assert.AreEqual(10, result.Count);
+
+        }
+
+    }
+}
\ No newline at end of file