66 lines
1.7 KiB
Solidity
66 lines
1.7 KiB
Solidity
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// SPDX-License-Identifier: GPL-3.0
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pragma solidity >=0.7.0 <0.9.0;
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contract DB {
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uint balance = 0;
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mapping(uint => uint) private _store;
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uint[] private _keys;
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struct Stats {
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uint gets;
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uint inserts;
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uint mods; // modifications
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}
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Stats _stats;
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event KeyedInsert(uint indexed key, uint value);
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event Insert(uint key, uint value, uint length);
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constructor() {
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_stats = Stats(0, 0, 0);
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}
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// insert adds a key value to the store, returning the new length of the store.
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function insert(uint k, uint v) external returns (uint) {
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// No need to store 0 values
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if (v == 0) {
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return _keys.length;
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}
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// Check if a key is being overriden
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if (_store[k] == 0) {
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_keys.push(k);
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_stats.inserts++;
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} else {
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_stats.mods++;
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}
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_store[k] = v;
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emit Insert(k, v, _keys.length);
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emit KeyedInsert(k, v);
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return _keys.length;
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}
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function get(uint k) public returns (uint) {
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_stats.gets++;
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return _store[k];
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}
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function getStatParams() public view returns (uint, uint, uint) {
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return (_stats.gets, _stats.inserts, _stats.mods);
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}
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function getNamedStatParams() public view returns (uint gets, uint inserts, uint mods) {
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return (_stats.gets, _stats.inserts, _stats.mods);
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}
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function getStatsStruct() public view returns (Stats memory) {
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return _stats;
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}
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receive() external payable {
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balance += msg.value;
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}
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fallback(bytes calldata _input) external returns (bytes memory _output) {
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_output = _input;
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}
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}
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