429 lines
13 KiB
PHP
429 lines
13 KiB
PHP
<?php
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namespace Driver\SQL;
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use \Api\Parameter\Parameter;
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use DateTime;
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use \Driver\SQL\Column\Column;
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use \Driver\SQL\Column\IntColumn;
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use \Driver\SQL\Column\SerialColumn;
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use \Driver\SQL\Column\StringColumn;
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use \Driver\SQL\Column\EnumColumn;
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use \Driver\SQL\Column\DateTimeColumn;
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use Driver\SQL\Column\BoolColumn;
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use Driver\SQL\Column\JsonColumn;
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use Driver\SQL\Expression\Add;
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use Driver\SQL\Expression\CurrentTimeStamp;
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use Driver\SQL\Expression\DateAdd;
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use Driver\SQL\Expression\DateSub;
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use Driver\SQL\Expression\Expression;
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use Driver\SQL\Expression\JsonArrayAgg;
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use Driver\SQL\Query\CreateProcedure;
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use Driver\SQL\Query\CreateTrigger;
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use Driver\SQL\Query\Query;
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use Driver\SQL\Strategy\Strategy;
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use \Driver\SQL\Strategy\UpdateStrategy;
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use Driver\SQL\Type\CurrentColumn;
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use Driver\SQL\Type\CurrentTable;
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use Driver\SQL\Type\Trigger;
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class MySQL extends SQL {
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public function __construct($connectionData) {
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parent::__construct($connectionData);
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}
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public function checkRequirements() {
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return function_exists('mysqli_connect');
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}
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public function getDriverName() {
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return 'mysqli';
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}
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// Connection Management
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public function connect() {
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if(!is_null($this->connection)) {
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return true;
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}
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@$this->connection = mysqli_connect(
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$this->connectionData->getHost(),
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$this->connectionData->getLogin(),
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$this->connectionData->getPassword(),
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$this->connectionData->getProperty('database'),
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$this->connectionData->getPort()
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);
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if (mysqli_connect_errno()) {
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$this->lastError = "Failed to connect to MySQL: " . mysqli_connect_error();
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$this->connection = NULL;
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return false;
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}
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mysqli_set_charset($this->connection, $this->connectionData->getProperty('encoding', 'UTF-8'));
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return true;
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}
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public function disconnect() {
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if(is_null($this->connection)) {
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return true;
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}
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mysqli_close($this->connection);
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return true;
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}
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public function getLastError(): string {
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$lastError = parent::getLastError();
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if (empty($lastError)) {
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$lastError = mysqli_error($this->connection);
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}
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return $lastError;
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}
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private function getPreparedParams($values) {
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$sqlParams = array('');
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foreach($values as $value) {
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$paramType = Parameter::parseType($value);
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switch($paramType) {
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case Parameter::TYPE_BOOLEAN:
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$value = $value ? 1 : 0;
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$sqlParams[0] .= 'i';
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break;
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case Parameter::TYPE_INT:
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$sqlParams[0] .= 'i';
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break;
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case Parameter::TYPE_FLOAT:
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$sqlParams[0] .= 'd';
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break;
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case Parameter::TYPE_DATE:
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if ($value instanceof DateTime) {
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$value = $value->format('Y-m-d');
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}
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$sqlParams[0] .= 's';
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break;
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case Parameter::TYPE_TIME:
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if ($value instanceof DateTime) {
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$value = $value->format('H:i:s');
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}
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$sqlParams[0] .= 's';
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break;
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case Parameter::TYPE_DATE_TIME:
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if ($value instanceof DateTime) {
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$value = $value->format('Y-m-d H:i:s');
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}
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$sqlParams[0] .= 's';
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break;
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case Parameter::TYPE_ARRAY:
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$value = json_encode($value);
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$sqlParams[0] .= 's';
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break;
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case Parameter::TYPE_EMAIL:
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default:
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$sqlParams[0] .= 's';
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}
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$sqlParams[] = $value;
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}
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return $sqlParams;
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}
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protected function execute($query, $values = NULL, $returnValues = false) {
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$resultRows = array();
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$this->lastError = "";
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if (is_null($values) || empty($values)) {
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$res = mysqli_query($this->connection, $query);
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$success = $res !== FALSE;
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if ($success && $returnValues) {
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while($row = $res->fetch_assoc()) {
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$resultRows[] = $row;
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}
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$res->close();
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}
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} else if($stmt = $this->connection->prepare($query)) {
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$success = false;
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$sqlParams = $this->getPreparedParams($values);
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$tmp = array();
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foreach($sqlParams as $key => $value) $tmp[$key] = &$sqlParams[$key];
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if(call_user_func_array(array($stmt, "bind_param"), $tmp)) {
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if($stmt->execute()) {
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if ($returnValues) {
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$res = $stmt->get_result();
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if($res) {
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while($row = $res->fetch_assoc()) {
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$resultRows[] = $row;
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}
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$res->close();
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$success = true;
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} else {
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$this->lastError = "PreparedStatement::get_result failed: $stmt->error ($stmt->errno)";
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}
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} else {
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$success = true;
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}
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} else {
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$this->lastError = "PreparedStatement::execute failed: $stmt->error ($stmt->errno)";
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}
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} else {
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$this->lastError = "PreparedStatement::prepare failed: $stmt->error ($stmt->errno)";
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}
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$stmt->close();
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} else {
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$success = false;
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}
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return ($success && $returnValues) ? $resultRows : $success;
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}
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public function getOnDuplicateStrategy(?Strategy $strategy, &$params): ?string {
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if (is_null($strategy)) {
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return "";
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} else if ($strategy instanceof UpdateStrategy) {
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$updateValues = array();
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foreach($strategy->getValues() as $key => $value) {
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$leftColumn = $this->columnName($key);
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if ($value instanceof Column) {
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$columnName = $this->columnName($value->getName());
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$updateValues[] = "$leftColumn=VALUES($columnName)";
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} else if($value instanceof Add) {
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$columnName = $this->columnName($value->getColumn());
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$operator = $value->getOperator();
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$value = $value->getValue();
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$updateValues[] = "$leftColumn=$columnName$operator" . $this->addValue($value, $params);
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} else {
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$updateValues[] = "$leftColumn=" . $this->addValue($value, $params);
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}
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}
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return " ON DUPLICATE KEY UPDATE " . implode(",", $updateValues);
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} else {
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$strategyClass = get_class($strategy);
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$this->lastError = "ON DUPLICATE Strategy $strategyClass is not supported yet.";
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return null;
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}
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}
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protected function fetchReturning($res, string $returningCol) {
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$this->lastInsertId = mysqli_insert_id($this->connection);
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}
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public function getColumnType(Column $column): ?string {
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if ($column instanceof StringColumn) {
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$maxSize = $column->getMaxSize();
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if ($maxSize) {
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return "VARCHAR($maxSize)";
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} else {
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return "TEXT";
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}
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} else if($column instanceof SerialColumn) {
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return "INTEGER AUTO_INCREMENT";
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} else if($column instanceof IntColumn) {
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$unsigned = $column->isUnsigned() ? " UNSIGNED" : "";
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return $column->getType() . $unsigned;
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} else if($column instanceof DateTimeColumn) {
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return "DATETIME";
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} else if($column instanceof BoolColumn) {
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return "BOOLEAN";
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} else if($column instanceof JsonColumn) {
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return "LONGTEXT"; # some maria db setups don't allow JSON here…
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} else {
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$this->lastError = "Unsupported Column Type: " . get_class($column);
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return NULL;
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}
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}
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public function getColumnDefinition(Column $column): ?string {
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$columnName = $this->columnName($column->getName());
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$defaultValue = $column->getDefaultValue();
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$type = $this->getColumnType($column);
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if (!$type) {
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if ($column instanceof EnumColumn) {
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$values = array();
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foreach($column->getValues() as $value) {
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$values[] = $this->getValueDefinition($value);
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}
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$values = implode(",", $values);
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$type = "ENUM($values)";
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} else {
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return null;
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}
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}
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if ($type === "LONGTEXT") {
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$defaultValue = NULL; # must be null :(
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}
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$notNull = $column->notNull() ? " NOT NULL" : "";
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if (!is_null($defaultValue) || !$column->notNull()) {
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$defaultValue = " DEFAULT " . $this->getValueDefinition($defaultValue);
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} else {
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$defaultValue = "";
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}
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return "$columnName $type$notNull$defaultValue";
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}
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public function getValueDefinition($value) {
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if (is_numeric($value)) {
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return $value;
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} else if(is_bool($value)) {
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return $value ? "TRUE" : "FALSE";
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} else if(is_null($value)) {
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return "NULL";
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} else if($value instanceof Keyword) {
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return $value->getValue();
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} else if ($value instanceof CurrentTimeStamp) {
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return "CURRENT_TIMESTAMP";
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} else {
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$str = addslashes($value);
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return "'$str'";
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}
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}
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public function addValue($val, &$params = NULL, bool $unsafe = false) {
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if ($val instanceof Keyword) {
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return $val->getValue();
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} else if ($val instanceof CurrentColumn) {
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return $val->getName();
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} else if ($val instanceof Column) {
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return $this->columnName($val->getName());
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} else if ($val instanceof Expression) {
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return $this->createExpression($val, $params);
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} else {
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if ($unsafe) {
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return $this->getUnsafeValue($val);
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} else {
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$params[] = $val;
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return "?";
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}
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}
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}
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public function tableName($table): string {
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if (is_array($table)) {
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$tables = array();
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foreach($table as $t) $tables[] = $this->tableName($t);
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return implode(",", $tables);
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} else {
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return "`$table`";
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}
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}
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public function columnName($col): string {
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if ($col instanceof Keyword) {
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return $col->getValue();
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} elseif(is_array($col)) {
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$columns = array();
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foreach($col as $c) $columns[] = $this->columnName($c);
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return implode(",", $columns);
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} else {
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if (($index = strrpos($col, ".")) !== FALSE) {
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$tableName = $this->tableName(substr($col, 0, $index));
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$columnName = $this->columnName(substr($col, $index + 1));
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return "$tableName.$columnName";
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} else if(($index = stripos($col, " as ")) !== FALSE) {
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$columnName = $this->columnName(trim(substr($col, 0, $index)));
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$alias = trim(substr($col, $index + 4));
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return "$columnName as $alias";
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} else {
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return "`$col`";
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}
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}
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}
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public function getStatus() {
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return mysqli_stat($this->connection);
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}
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public function createTriggerBody(CreateTrigger $trigger): ?string {
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$values = array();
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foreach ($trigger->getProcedure()->getParameters() as $param) {
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if ($param instanceof CurrentTable) {
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$values[] = $this->getUnsafeValue($trigger->getTable());
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} else {
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$prefix = ($trigger->getEvent() !== "DELETE" ? "NEW." : "OLD.");
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$values[] = $this->columnName($prefix . $param->getName());
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}
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}
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$procName = $trigger->getProcedure()->getName();
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$procParameters = implode(",", $values);
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return "CALL $procName($procParameters)";
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}
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private function getParameterDefinition(Column $parameter, bool $out = false): string {
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$out = ($out ? "OUT" : "IN");
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$name = $parameter->getName();
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$type = $this->getColumnType($parameter);
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return "$out $name $type";
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}
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public function getProcedureHead(CreateProcedure $procedure): ?string {
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$name = $procedure->getName();
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$returns = $procedure->getReturns();
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$paramDefs = [];
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foreach ($procedure->getParameters() as $param) {
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if ($param instanceof Column) {
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$paramDefs[] = $this->getParameterDefinition($param);
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} else {
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$this->setLastError("PROCEDURE parameter type " . gettype($returns) . " is not implemented yet");
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return null;
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}
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}
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if ($returns) {
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if ($returns instanceof Column) {
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$paramDefs[] = $this->getParameterDefinition($returns, true);
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} else if (!($returns instanceof Trigger)) { // mysql does not need to return triggers here
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$this->setLastError("PROCEDURE RETURN type " . gettype($returns) . " is not implemented yet");
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return null;
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}
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}
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$paramDefs = implode(",", $paramDefs);
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return "CREATE PROCEDURE $name($paramDefs)";
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}
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protected function buildUnsafe(Query $statement): string {
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$params = [];
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$query = $statement->build($params);
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foreach ($params as $value) {
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$query = preg_replace("?", $this->getUnsafeValue($value), $query, 1);
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}
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return $query;
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}
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protected function createExpression(Expression $exp, array &$params): ?string {
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if ($exp instanceof DateAdd || $exp instanceof DateSub) {
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$lhs = $this->addValue($exp->getLHS(), $params);
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$rhs = $this->addValue($exp->getRHS(), $params);
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$unit = $exp->getUnit();
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$dateFunction = ($exp instanceof DateAdd ? "DATE_ADD" : "DATE_SUB");
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return "$dateFunction($lhs, INTERVAL $rhs $unit)";
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} else if ($exp instanceof CurrentTimeStamp) {
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return "NOW()";
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} else if ($exp instanceof JsonArrayAgg) {
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$value = $this->addValue($exp->getValue(), $params);
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$alias = $this->columnName($exp->getAlias());
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return "JSON_ARRAYAGG($value) as $alias";
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} else {
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return parent::createExpression($exp, $params);
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}
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}
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}
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