fix sql generation when params have $ chars

Author: mythz

src/ServiceStack.OrmLite/OrmLiteDialectProviderBase.cs

@@ -757,7 +757,10 @@ public virtual string MergeParamsIntoSql(string sql, IEnumerable<IDbDataParamete
                 var quotedValue = dbParam.Value != null
                     ? GetQuotedValue(dbParam.Value, dbParam.Value.GetType())
                     : "null";
-                sql = Regex.Replace(sql, dbParam.ParameterName + @"(,|\s|\)|$)", quotedValue + "$1");
+
+                var pattern = dbParam.ParameterName + @"(,|\s|\)|$)";
+                var replacement = quotedValue.Replace("$", "$$") + "$1";
+                sql = Regex.Replace(sql, pattern, replacement);
             }
             return sql;
         }

tests/ServiceStack.OrmLite.Tests/Issues/GeneratedSqlIssues.cs

@@ -0,0 +1,28 @@
+using NUnit.Framework;
+using ServiceStack.Common.Tests.Models;
+
+namespace ServiceStack.OrmLite.Tests.Issues
+{
+    public class GeneratedSqlIssues : OrmLiteTestBase
+    {
+        public GeneratedSqlIssues() : base(Dialect.SqlServer2012) {}
+
+        [Test]
+        public void Does_generate_valid_sql_when_param_contains_dollar_char()
+        {
+            using (var db = OpenDbConnection())
+            {
+                var model = new Poco
+                {
+                    Id = 1,
+                    Name = "Guest$"
+                };
+
+                var sql = db.ToUpdateStatement(model);
+                Assert.That(sql, Is.EqualTo("UPDATE \"Poco\" SET \"Name\"='Guest$' WHERE \"Id\"=1"));
+            }
+
+        }
+
+    }
+}