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[db2] Allow to edit values.

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This commit is contained in:
lzwdgc 2024-02-16 02:13:31 +03:00
parent e45fab0c0f
commit 0bd3e6e64b
1 changed files with 59 additions and 2 deletions
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61
src/common/db2.h
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@ -125,7 +125,7 @@ struct db2 {
} else if constexpr (std::same_as<std::decay_t<decltype(v)>, float>) {
return sizeof(db2::dat::field_value_base) + sizeof(float);
} else {
auto s = str2str(v, CP_UTF8, codepage);
auto s = utf8_to_dbstr(v);
return sizeof(db2::dat::field_value_base) + s.size() + 1;
}
}
@ -166,7 +166,7 @@ struct db2 {
if (field.type != db2::field_type::string) {
throw std::runtime_error{"field type mismatch"};
}
auto s = str2str(v, CP_UTF8, codepage);
auto s = utf8_to_dbstr(v);
(*(db2::dat::field_value_base *)p).field_id = field.id;
(*(db2::dat::field_value_base *)p).size = s.size() + 1;
p += sizeof(db2::dat::field_value_base);
@ -232,4 +232,61 @@ struct db2 {
}
}
}
template <typename T>
void edit_value(std::string_view table, std::string_view value, std::string_view field, const T &field_value) {
auto tbl = tab_->tables();
auto fields = tab_->fields();
auto values = ind_->values();
auto table_db_cp = utf8_to_dbstr(table.data());
auto value_db_cp = utf8_to_dbstr(value.data());
auto field_db_cp = utf8_to_dbstr(field.data());
auto it = std::ranges::find_if(tbl, [&](auto &v) {
return table_db_cp == v.name;
});
if (it == tbl.end()) {
throw std::runtime_error{"no such table: "s + table_db_cp};
}
auto &t = *it;
auto itv = std::ranges::find_if(values, [&](auto &v) {
return v.table_id == t.id && value_db_cp == v.name;
});
if (itv == values.end()) {
throw std::runtime_error{"no such value: "s + value_db_cp};
}
auto itf = std::ranges::find_if(fields, [&](auto &v) {
return v.table_id == t.id && field_db_cp == v.name;
});
if (itf == fields.end()) {
throw std::runtime_error{"no such field: "s + field_db_cp};
}
auto p = fdat.p + itv->offset;
while (p < fdat.p + itv->offset + itv->size) {
auto &header = *(dat::field_value_base*)p;
p += sizeof(header);
if (header.field_id == itf->id) {
if constexpr (std::same_as<std::decay_t<decltype(field_value)>, int>) {
*(int*)p = field_value;
} else if constexpr (std::same_as<std::decay_t<decltype(field_value)>, float>) {
*(float *)p = field_value;
} else {
auto s = utf8_to_dbstr(field_value);
if (s.size() + 1 != header.size) {
throw std::runtime_error{"not implemented yet"}; // maybe just assign new value into the end of db
}
memcpy(p, s.data(), s.size());
}
return;
}
p += header.size;
}
throw std::runtime_error{"no such field"};
}
private:
std::string utf8_to_dbstr(const char *s) const {
return str2str(s, CP_UTF8, codepage);
}
};