add field comment on create table

orm/cmd_utils.go

@@ -197,6 +197,10 @@ func getDbCreateSQL(al *alias) (sqls []string, tableIndexes map[string][]dbIndex
 			if strings.Contains(column, "%COL%") {
 				column = strings.Replace(column, "%COL%", fi.column, -1)
 			}
+			
+			if fi.description != "" {
+				column += " " + fmt.Sprintf("COMMENT '%s'",fi.description)
+			}
 
 			columns = append(columns, column)
 		}

orm/models_info_f.go

@@ -136,6 +136,7 @@ type fieldInfo struct {
 	decimals            int
 	isFielder           bool // implement Fielder interface
 	onDelete            string
+	description         string
 }
 
 // new field info
@@ -300,6 +301,7 @@ checkType:
 	fi.sf = sf
 	fi.fullName = mi.fullName + mName + "." + sf.Name
 
+	fi.description = sf.Tag.Get("description")
 	fi.null = attrs["null"]
 	fi.index = attrs["index"]
 	fi.auto = attrs["auto"]