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