Add precision support for MySql DateTime

Author: mythz

src/ServiceStack.OrmLite.MySql/Converters/MySqlDateTimeConverterBase.cs

@@ -5,14 +5,23 @@ namespace ServiceStack.OrmLite.MySql.Converters
 {
     public abstract class MySqlDateTimeConverterBase : DateTimeConverter
     {
+        public int Precision { get; set; } = 0;
+
+        public override string ColumnDefinition => Precision == 0
+            ? "DATETIME"
+            : $"DATETIME({Precision})";
+
         public override string ToQuotedString(Type fieldType, object value)
         {
             /*
              * ms not contained in format. MySql ignores ms part anyway
              * for more details see: http://dev.mysql.com/doc/refman/5.1/en/datetime.html
              */
             var dateTime = (DateTime)value;
-            return DateTimeFmt(dateTime, "yyyy-MM-dd HH:mm:ss");
+            var suffix = Precision > 0
+                ? "." + new string('f', Precision)
+                : "";
+            return DateTimeFmt(dateTime, "yyyy-MM-dd HH:mm:ss" + suffix);
         }
 
     }

tests/ServiceStack.OrmLite.MySql.Tests/DateTimeColumnTest.cs

@@ -5,6 +5,9 @@
 using NUnit.Framework;
 using ServiceStack.DataAnnotations;
 using ServiceStack.Model;
+using ServiceStack.OrmLite.Legacy;
+using ServiceStack.OrmLite.MySql.Converters;
+using ServiceStack.Text;
 
 namespace ServiceStack.OrmLite.MySql.Tests
 {
@@ -15,52 +18,80 @@ public class DateTimeColumnTest
         [Test]
         public void Can_create_table_containing_DateTime_column()
         {
-            using (var db = OpenDbConnection())
-            {
-                db.CreateTable<Analyze>(true);
-            }
+            using var db = OpenDbConnection();
+            db.CreateTable<Analyze>(true);
         }
 
         [Test]
         public void Can_store_DateTime_Value()
         {
-            using (var db = OpenDbConnection())
-            {
-                db.CreateTable<Analyze>(true);
+            using var db = OpenDbConnection();
+            db.CreateTable<Analyze>(true);
 
-                var obj = new Analyze {
-                    Id = 1,
-                    Date = DateTime.Now,
-                    Url = "http://www.google.com"
-                };
+            var obj = new Analyze {
+                Id = 1,
+                Date = DateTime.Now,
+                Url = "http://www.google.com"
+            };
 
-                db.Save(obj);
-            }
+            db.Save(obj);
         }
 
         [Test]
         public void Can_store_and_retrieve_DateTime_Value()
         {
-            using (var db = OpenDbConnection())
-            {
-                db.CreateTable<Analyze>(true);
+            using var db = OpenDbConnection();
+            db.CreateTable<Analyze>(true);
+
+            var obj = new Analyze {
+                Id = 1,
+                Date = DateTime.Now,
+                Url = "http://www.google.com"
+            };
 
-                var obj = new Analyze {
-                    Id = 1,
-                    Date = DateTime.Now,
-                    Url = "http://www.google.com"
-                };
+            db.Save(obj);
 
-                db.Save(obj);
+            var id = (int)db.LastInsertId();
+            var target = db.SingleById<Analyze>(id);
 
-                var id = (int)db.LastInsertId();
-                var target = db.SingleById<Analyze>(id);
+            Assert.That(target, Is.Not.Null);
+            Assert.That(target.Id, Is.EqualTo(id));
+            Assert.That(target.Date, Is.EqualTo(obj.Date).Within(TimeSpan.FromSeconds(1)));
+            Assert.That(target.Url, Is.EqualTo(obj.Url));
+        }
 
-                Assert.That(target, Is.Not.Null);
-                Assert.That(target.Id, Is.EqualTo(id));
-                Assert.That(target.Date, Is.EqualTo(obj.Date).Within(TimeSpan.FromSeconds(1)));
-                Assert.That(target.Url, Is.EqualTo(obj.Url));
+        [Test]
+        public void Can_change_DateTime_precision()
+        {
+            using var db = OpenDbConnection();
+            if (MySqlDialect.Provider.GetConverter(typeof(DateTime)) is MySqlDateTimeConverterBase dateConverter)
+            {
+                dateConverter.Precision = 3;
             }
+
+            OrmLiteUtils.PrintSql();
+            db.CreateTable<Analyze>(true);
+
+            var obj = new Analyze {
+                Id = 1,
+                Date = DateTime.Now,
+                Url = "http://www.google.com"
+            };
+
+            db.Save(obj);
+
+            var id = (int)db.LastInsertId();
+            var target = db.SingleById<Analyze>(id);
+            target.PrintDump();
+
+            var q = db.From<Analyze>()
+                .Where(x => x.Date >= DateTime.Now.Date);
+            var results = db.Select(q);
+            Assert.That(results.Count, Is.EqualTo(1));
+            results.PrintDump();
+            
+            results = db.SelectFmt<Analyze>("AnalyzeDate >= {0}", DateTime.Now.AddDays(-1));
+            results.PrintDump();
         }
 
         /// <summary>