Returns an appropriately typed Secondary Index.
Returns an appropriately typed Secondary Index.
Parameters
IndexName- the ID of the desired secondary index
Returns
An index of the appropriate type: Primitive 64-bit unsigned integer key (idx64), Primitive 128-bit unsigned integer key (idx128), 128-bit fixed-size lexicographical key (idx128), 256-bit fixed-size lexicographical key (idx256), Floating point key, Double precision floating point key, Long Double (quadruple) precision floating point key
Example:
#include <eosiolib/eosio.hpp>
using namespace eosio;
using namespace std;
class addressbook: contract {
struct address {
uint64_t account_name;
string first_name;
string last_name;
string street;
string city;
string state;
uint32_t zip = 0;
uint64_t primary_key() const { return account_name; }
uint64_t by_zip() const { return zip; }
EOSLIB_SERIALIZE( address, (account_name)(first_name)(last_name)(street)(city)(state)(zip) )
};
public:
addressbook(account_name self):contract(self) {}
typedef eosio::multi_index< N(address), address, indexed_by< N(zip), const_mem_fun<address, uint64_t, &address::by_zip> > address_index;
void myaction() {
address_index addresses(_self, _self); // code, scope
// add to table, first argument is account to bill for storage
addresses.emplace(payer, [&](auto& address) {
address.account_name = N(dan);
address.first_name = "Daniel";
address.last_name = "Larimer";
address.street = "1 EOS Way";
address.city = "Blacksburg";
address.state = "VA";
address.zip = 93446;
});
uint32_t zipnumb = 93446;
auto zip_index = addresses.get_index<N(zip)>();
auto itr = zip_index.find(zipnumb);
eosio_assert(itr->account_name == N(dan), "Incorrect Record ");
}
}
EOSIO_ABI( addressbook, (myaction) )