uint64_t read_only::get_table_index_name(const read_only::get_table_rows_params& p, bool& primary) {
using boost::algorithm::starts_with;
// see multi_index packing of index name
const uint64_t table = p.table;
uint64_t index = table & 0xFFFFFFFFFFFFFFF0ULL;
EOS_ASSERT( index == table, chain::contract_table_query_exception, "Unsupported table name: ${n}", ("n", p.table) );
primary = false;
uint64_t pos = 0;
if (p.index_position.empty() || p.index_position == "first" || p.index_position == "primary" || p.index_position == "one") {
primary = true;
} else if (starts_with(p.index_position, "sec") || p.index_position == "two") { // second, secondary
} else if (starts_with(p.index_position , "ter") || starts_with(p.index_position, "th")) { // tertiary, ternary, third, three
pos = 1;
} else if (starts_with(p.index_position, "fou")) { // four, fourth
pos = 2;
} else if (starts_with(p.index_position, "fi")) { // five, fifth
pos = 3;
} else if (starts_with(p.index_position, "six")) { // six, sixth
pos = 4;
} else if (starts_with(p.index_position, "sev")) { // seven, seventh
pos = 5;
} else if (starts_with(p.index_position, "eig")) { // eight, eighth
pos = 6;
} else if (starts_with(p.index_position, "nin")) { // nine, ninth
pos = 7;
} else if (starts_with(p.index_position, "ten")) { // ten, tenth
pos = 8;
} else {
try {
pos = fc::to_uint64( p.index_position );
} catch(...) {
EOS_ASSERT( false, chain::contract_table_query_exception, "Invalid index_position: ${p}", ("p", p.index_position));
}
if (pos < 2) {
primary = true;
pos = 0;
} else {
pos -= 2;
}
}
index |= (pos & 0x000000000000000FULL);
return index;
}Position of the index used, accepted parameters primary, secondary, tertiary, fourth, fifth, sixth, seventh, eighth, ninth , tenth
index_position 可以以某前缀的名字指定对应多级索引，或者数字（从2开始）
