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Primary Key Information #103

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@SimpleForest

Your python script does store internally the information for columns being the pk.

   ddlPrimaryKey = pp.Group(
        pp.CaselessKeyword("PRIMARY") + pp.CaselessKeyword("KEY")
    ).setResultsName("isPrimaryKey")

What would be amazing to write this information into the script generated header under the name is_primary_key :

  struct TabFoo_ : public ::sqlpp::name_tag_base {
    struct Id : public ::sqlpp::name_tag_base {
      SQLPP_CREATE_NAME_TAG_FOR_SQL_AND_CPP(id, id);
      using data_type = ::sqlpp::integral;
      using has_default = std::true_type;
      using is_primary_key = std::true_type;
    };
      using has_default = std::false_type;

for all other non pk columns.

For me PK is valuable information as a sqlpp23 user. How to you see it as a library owner? Worth implementing it or are there reasons against I do not see?

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