修复sql语句没有COMMENT导致的panic问题 && 增加单元测试

sql2go/parser.go

@@ -64,12 +64,18 @@ func ParseCreateTableSql(sql string) (string, *BasicTableInfo, error) {
 	structResult := "type " + basic.ModelStruct + " struct { \n"
 
 	for _, item := range r.TableSpec.Columns {
+		comment := ""
+		if item.Type.Comment == nil {
+			comment = item.Name.String()
+		} else {
+			comment = string(item.Type.Comment.Val)
+		}
 		data := map[string]string{
 			"{FIELD}":         util.String.SnakeCaseToCamel(item.Name.String()),
 			"{COLUMN}":        item.Name.String(),
 			"{JSON_TAG}":      item.Name.String(),
 			"{DEFAULT_VALUE}": "",
-			"{COMMENT}":       item.Name.String() + " " + string(item.Type.Comment.Val),
+			"{COMMENT}":       comment,
 			"{TYPE}":          sqlTypeMap[item.Type.Type],
 		}
 		if data["{FIELD}"] == "ID" {