Use ColumnType when generate SQL

Author: mythz

src/ServiceStack.OrmLite.Firebird/FirebirdOrmLiteDialectProvider.cs

@@ -333,7 +333,7 @@ public override string ToCreateTableStatement(Type tableType)
 
                 var columnDefinition = GetColumnDefinition(
                     fieldDef.FieldName,
-                    fieldDef.FieldType,
+                    fieldDef.ColumnType,
                     fieldDef.IsPrimaryKey,
                     fieldDef.AutoIncrement,
                     fieldDef.IsNullable,
@@ -757,7 +757,7 @@ public override string GetForeignKeyOnUpdateClause(ForeignKeyConstraint foreignK
 		public override string ToAddColumnStatement(Type modelType, FieldDefinition fieldDef){
 
 			var column = GetColumnDefinition(fieldDef.FieldName,
-			                                 fieldDef.FieldType,
+                                             fieldDef.ColumnType,
 			                                 fieldDef.IsPrimaryKey,
 			                                 fieldDef.AutoIncrement,
 			                                 fieldDef.IsNullable,
@@ -774,7 +774,7 @@ public override string ToAlterColumnStatement(Type modelType, FieldDefinition fi
 		{
 
 			var column = GetColumnDefinition(fieldDef.FieldName,
-			                                 fieldDef.FieldType,
+                                             fieldDef.ColumnType,
 			                                 fieldDef.IsPrimaryKey,
 			                                 fieldDef.AutoIncrement,
 			                                 fieldDef.IsNullable,

src/ServiceStack.OrmLite.MySql/MySqlDialectProvider.cs

@@ -32,6 +32,8 @@ public override void OnAfterInitColumnTypeMap()
         {
             DbTypeMap.Set<Guid>(DbType.String, GuidColumnDefinition);
             DbTypeMap.Set<Guid?>(DbType.String, GuidColumnDefinition);
+            DbTypeMap.Set<DateTimeOffset>(DbType.DateTimeOffset, StringColumnDefinition);
+            DbTypeMap.Set<DateTimeOffset?>(DbType.DateTimeOffset, StringColumnDefinition);
         }
 
         public override string GetQuotedValue(string paramValue)
@@ -174,8 +176,8 @@ public string GetColumnDefinition(FieldDefinition fieldDefinition)
             }
 
             return base.GetColumnDefinition(
-                fieldDefinition.FieldName, 
-                fieldDefinition.FieldType,
+                fieldDefinition.FieldName,
+                fieldDefinition.ColumnType,
                 fieldDefinition.IsPrimaryKey, 
                 fieldDefinition.AutoIncrement, 
                 fieldDefinition.IsNullable, 

src/ServiceStack.OrmLite.SqlServer/SqlServerOrmLiteDialectProvider.cs

@@ -269,7 +269,7 @@ public override string GetDropForeignKeyConstraints(ModelDefinition modelDef)
         public override string ToAddColumnStatement(Type modelType, FieldDefinition fieldDef)
         {
             var column = GetColumnDefinition(fieldDef.FieldName,
-                                             fieldDef.FieldType,
+                                             fieldDef.ColumnType,
                                              fieldDef.IsPrimaryKey,
                                              fieldDef.AutoIncrement,
                                              fieldDef.IsNullable,
@@ -286,7 +286,7 @@ public override string ToAddColumnStatement(Type modelType, FieldDefinition fiel
         public override string ToAlterColumnStatement(Type modelType, FieldDefinition fieldDef)
         {
             var column = GetColumnDefinition(fieldDef.FieldName,
-                                             fieldDef.FieldType,
+                                             fieldDef.ColumnType,
                                              fieldDef.IsPrimaryKey,
                                              fieldDef.AutoIncrement,
                                              fieldDef.IsNullable,