S2OJ/web/app/models/DB.php

452 lines
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PHP
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<?php
class DB {
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public static mysqli $conn;
public static array $cache = [];
public static bool $in_transaction = false;
const WLOCK = "WRITE";
const RLOCK = "READ";
const ASSOC = MYSQLI_ASSOC;
const NUM = MYSQLI_NUM;
const BOTH = MYSQLI_BOTH;
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public static function init() {
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$server = UOJConfig::$data['database']['host'];
$username = UOJConfig::$data['database']['username'];
$password = UOJConfig::$data['database']['password'];
$dbname = UOJConfig::$data['database']['database'];
DB::$conn = new mysqli($server, $username, $password, $dbname);
if (DB::$conn->connect_error) {
UOJLog::error('database initialization failed: '. DB::$conn->connect_error);
die('There is something wrong with the database >_<... Connection failed');
}
if (!DB::$conn->set_charset("utf8mb4")) {
UOJLog::error("database initialization failed: Error loading character set utf8. " . DB::$conn->error);
die('There is something wrong with the database >_<.... Charset utf8 not supported');
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}
}
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// lc: local cache
public static function lc() {
return new DBUseLocalCache('');
}
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public static function escape($str) {
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return DB::$conn->real_escape_string($str);
}
public static function raw($str) {
return new DBRawString($str);
}
public static function rawbracket($q) {
return DB::raw(DB::bracket($q));
}
public static function rawvalue($str) {
return DB::raw(DB::value($str));
}
public static function rawtuple(array $vals) {
return DB::raw(DB::tuple($vals));
}
public static function call($fun, ...$args) {
return DB::raw("{$fun}(".implode(',', array_map('DB::value', $args)).')');
}
public static function now() {
return DB::call('now');
}
public static function instr($str, $substr) {
return DB::call('instr', $str, $substr);
}
public static function cast_as_json($value) {
return DB::raw('cast('.DB::value($value).' as json)');
}
public static function json_set($json_doc, ...$args) {
return DB::call('json_set', DB::raw($json_doc), ...$args);
}
public static function json_insert($json_doc, ...$args) {
return DB::call('json_insert', DB::raw($json_doc), ...$args);
}
public static function json_replace($json_doc, ...$args) {
return DB::call('json_replace', DB::raw($json_doc), ...$args);
}
public static function json_remove($json_doc, ...$args) {
return DB::call('json_remove', DB::raw($json_doc), ...$args);
}
public static function json_array_append($json_doc, ...$args) {
return DB::call('json_array_append', DB::raw($json_doc), ...$args);
}
public static function json_array_insert($json_doc, ...$args) {
return DB::call('json_array_insert', DB::raw($json_doc), ...$args);
}
public static function json_unquote($json_doc) {
return DB::call('json_unquote', DB::raw($json_doc));
}
public static function table($table) {
//return '`'.str_replace('`', '``', $table).'`';
return $table;
}
public static function fields($fields) {
if (is_assoc($fields)) {
$new_fields = [];
foreach ($fields as $name => $val) {
if (is_int($name)) {
$new_fields[] = $val;
} else {
$new_fields[] = DB::field_as($val, $name);
}
}
$fields = $new_fields;
}
return implode(',', $fields);
}
public static function bracketed_fields($fields) {
return '('.DB::fields($fields).')';
}
public static function value($str) {
if ($str === null) {
return 'NULL';
} elseif ($str === true) {
return 'true';
} elseif ($str === false) {
return 'false';
} elseif (is_int($str)) {
return $str;
} elseif (is_string($str)) {
return '\''.DB::escape($str).'\'';
} elseif ($str instanceof DBRawString) {
return $str->str;
} else {
return false;
}
}
public static function field_as($field, $name) {
return "{$field} as {$name}";
}
public static function value_as($value, $name) {
return DB::value($value)." as {$name}";
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}
public static function if_func($conds, $val1, $val2) {
return 'if('.DB::conds($conds).','.DB::value($val1).','.DB::value($val2).')';
}
public static function setValue($field, $val) {
return $field.' = '.DB::value($val);
}
public static function setValues(array $arr) {
$all = [];
foreach ($arr as $key => $val) {
if (is_int($key)) {
$all[] = $val;
} else {
$all[] = DB::setValue($key, $val);
}
}
return implode(', ', $all);
}
public static function cond($cond) {
if (is_array($cond)) {
if (count($cond) == 3) {
$lhs = $cond[0] instanceof DBRawString ? $cond[0]->str : $cond[0];
$op = $cond[1];
$rhs = DB::value($cond[2]);
return $lhs.' '.$op.' '.$rhs;
} else {
return false;
}
}
return $cond;
}
public static function conds($conds) {
return is_array($conds) ? DB::land($conds) : $conds;
}
public static function land(array $conds) {
if (is_assoc($conds)) {
$new_conds = [];
foreach ($conds as $key => $val) {
if (is_int($key)) {
$new_conds[] = $val;
} else {
if ($val !== null) {
$new_conds[] = [$key, '=', $val];
} else {
$new_conds[] = [$key, 'is', $val];
}
}
}
$conds = $new_conds;
}
return '('.implode(' and ', array_map('DB::cond', $conds)).')';
}
public static function lor(array $conds) {
if (is_assoc($conds)) {
$new_conds = [];
foreach ($conds as $key => $val) {
if (is_int($key)) {
$new_conds[] = $val;
} else {
if ($val !== null) {
$new_conds[] = [$key, '=', $val];
} else {
$new_conds[] = [$key, 'is', $val];
}
}
}
$conds = $new_conds;
}
return '('.implode(' or ', array_map('DB::cond', $conds)).')';
}
public static function tuple(array $vals) {
$str = '(';
$first = true;
foreach ($vals as $val) {
if (!$first) {
$str .= ',';
} else {
$first = false;
}
$str .= DB::value($val);
}
$str .= ')';
return $str;
}
public static function tuples(array $tuples) {
$all = [];
foreach ($tuples as $vals) {
$all[] = DB::tuple($vals);
}
return implode(', ', $all);
}
public static function fetch($res, $opt = DB::ASSOC) {
return $res->fetch_array($opt);
}
public static function bracket($q) {
return '('.DB::query_str($q).')';
}
public static function query_str($q) {
if (is_array($q)) {
$last = '';
$qn = 0;
$use_local_cache = false;
foreach ($q as $val) {
if (is_array($val)) {
if ($last !== 'set' && $last !== "on duplicate key update") {
$val = DB::land($val);
} else {
$val = DB::setValues($val);
}
} elseif ($val instanceof DBUseLocalCache) {
$use_local_cache = true;
$val = $val->str;
}
$last = $val;
if ($val !== '') {
$q[$qn++] = $val;
}
}
array_splice($q, $qn);
$q = implode(' ', $q);
if ($use_local_cache) {
$q = new DBUseLocalCache($q);
}
return $q;
}
return $q;
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}
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public static function exists($q) {
return 'exists '.DB::bracket($q);
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}
public static function query($q) {
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return DB::$conn->query(DB::query_str($q));
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}
public static function update($q) {
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$ret = DB::$conn->query(DB::query_str($q));
if ($ret === false) {
UOJLog::error(DB::query_str($q));
UOJLog::error('update failed: '.DB::$conn->error);
}
return $ret;
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}
public static function insert($q) {
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$ret = DB::$conn->query(DB::query_str($q));
if ($ret === false) {
UOJLog::error(DB::query_str($q));
UOJLog::error('insert failed: '.DB::$conn->error);
}
return $ret;
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}
public static function insert_id() {
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return DB::$conn->insert_id;
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}
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public static function delete($q) {
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$ret = DB::$conn->query(DB::query_str($q));
if ($ret === false) {
UOJLog::error(DB::query_str($q));
UOJLog::error('delete failed: '.DB::$conn->error);
}
return $ret;
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}
public static function select($q) {
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$q = DB::query_str($q);
if ($q instanceof DBUseLocalCache) {
$q = $q->str;
$use_local_cache = true;
} else {
$use_local_cache = false;
}
if ($use_local_cache && isset(DB::$cache[$q])) {
$res = DB::$cache[$q];
$res->data_seek(0);
$res->field_seek(0);
return $res;
}
$res = DB::$conn->query($q);
if ($use_local_cache) {
DB::$cache[$q] = $res;
}
if ($res === false) {
UOJLog::error($q);
UOJLog::error(DB::$conn->error);
}
return $res;
}
public static function selectAll($q, $opt = DB::ASSOC) {
$qres = DB::select($q);
if ($qres === false) {
return false;
}
// return $qres->fetch_all($opt); not supported
$res = [];
while ($row = $qres->fetch_array($opt)) {
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$res[] = $row;
}
return $res;
}
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public static function selectFirst($q, $opt = DB::ASSOC) {
$res = DB::select($q);
if ($res === false) {
return false;
}
return $res->fetch_array($opt);
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}
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public static function selectSingle($q) {
$res = DB::select($q);
if ($res === false) {
return false;
}
$row = $res->fetch_row();
if (!$row) {
return false;
}
return $row[0];
}
/**
* perform SQL query $q in the form of select count(*) from XXX where XXX;
*/
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public static function selectCount($q) {
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$res = DB::select($q);
if ($res === false) {
return false;
}
list($cnt) = $res->fetch_row();
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return $cnt;
}
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/**
* perform SQL query: select exists ($q);
*
* on success, returns 0 or 1
* on failure, returns false
*
* @return int|false
*/
public static function selectExists($q) {
$res = DB::select(["select", DB::exists($q)]);
if ($res === false) {
return false;
}
return (int)($res->fetch_row()[0]);
}
public static function limit() {
$num = func_get_args();
if (count($num) == 1) {
return "limit ".((int)$num[0]);
} elseif (count($num) == 2) {
return "limit ".((int)$num[0]).",".((int)$num[1]);
} else {
return false;
}
}
public static function for_share() {
return "for share";
}
public static function for_update() {
return "for update";
}
public static function startTransaction() {
return DB::$conn->begin_transaction();
}
public static function rollback() {
return DB::$conn->rollback();
}
public static function commit() {
return DB::$conn->commit();
}
public static function transaction($func) {
if (DB::$in_transaction) {
$ret = $func();
} else {
DB::$in_transaction = true;
DB::startTransaction();
$ret = $func();
DB::commit();
DB::$in_transaction = false;
}
return $ret;
}
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public static function lock($tables, $func) {
$q = [];
foreach ($tables as $table => $type) {
if ($type != DB::WLOCK && $type != DB::RLOCK) {
UOJLog::error('Unknown type: '.$type);
return false;
}
$q[] = $table.' '.$type;
}
$q = 'lock tables '.implode(',', $q);
DB::query($q);
$ret = $func();
DB::query("unlock tables");
return $ret;
}
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public static function checkTableExists($name) {
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return DB::select(["select 1 from", DB::table($name)]) !== false;
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}
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public static function num_rows($res) {
return $res->num_rows;
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}
public static function affected_rows() {
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return DB::$conn->affected_rows;
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}
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}