388 lines
12 KiB
PHP
388 lines
12 KiB
PHP
<?php
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namespace Driver\SQL;
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use Driver\SQL\Column\Column;
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use Driver\SQL\Condition\Compare;
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use Driver\SQL\Condition\CondAnd;
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use Driver\SQL\Condition\CondBool;
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use Driver\SQL\Condition\CondIn;
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use Driver\SQL\Condition\Condition;
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use Driver\SQL\Condition\CondKeyword;
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use Driver\SQL\Condition\CondNot;
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use Driver\Sql\Condition\CondNull;
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use Driver\SQL\Condition\CondOr;
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use Driver\SQL\Condition\Exists;
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use Driver\SQL\Constraint\Constraint;
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use \Driver\SQL\Constraint\Unique;
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use \Driver\SQL\Constraint\PrimaryKey;
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use \Driver\SQL\Constraint\ForeignKey;
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use Driver\SQL\Expression\CaseWhen;
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use Driver\SQL\Expression\CurrentTimeStamp;
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use Driver\SQL\Expression\Expression;
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use Driver\SQL\Expression\Sum;
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use Driver\SQL\Query\AlterTable;
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use Driver\SQL\Query\CreateProcedure;
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use Driver\SQL\Query\CreateTable;
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use Driver\SQL\Query\CreateTrigger;
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use Driver\SQL\Query\Delete;
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use Driver\SQL\Query\Drop;
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use Driver\SQL\Query\Insert;
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use Driver\SQL\Query\Query;
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use Driver\SQL\Query\Select;
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use Driver\SQL\Query\Truncate;
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use Driver\SQL\Query\Update;
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use Driver\SQL\Strategy\CascadeStrategy;
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use Driver\SQL\Strategy\SetDefaultStrategy;
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use Driver\SQL\Strategy\SetNullStrategy;
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use Driver\SQL\Strategy\Strategy;
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use Objects\ConnectionData;
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abstract class SQL {
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protected string $lastError;
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protected $connection;
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protected ConnectionData $connectionData;
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protected int $lastInsertId;
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public function __construct($connectionData) {
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$this->connection = NULL;
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$this->lastError = 'Unknown Error';
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$this->connectionData = $connectionData;
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$this->lastInsertId = 0;
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}
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public function isConnected(): bool {
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return !is_null($this->connection);
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}
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public function getLastError(): string {
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return trim($this->lastError);
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}
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public function createTable($tableName): CreateTable {
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return new CreateTable($this, $tableName);
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}
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public function insert($tableName, $columns=array()): Insert {
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return new Insert($this, $tableName, $columns);
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}
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public function select(...$columNames): Select {
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return new Select($this, $columNames);
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}
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public function truncate($table): Truncate {
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return new Truncate($this, $table);
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}
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public function delete($table): Delete {
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return new Delete($this, $table);
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}
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public function update($table): Update {
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return new Update($this, $table);
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}
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public function drop(string $table): Drop {
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return new Drop($this, $table);
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}
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public function alterTable($tableName): AlterTable {
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return new AlterTable($this, $tableName);
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}
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public function createTrigger($triggerName): CreateTrigger {
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return new CreateTrigger($this, $triggerName);
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}
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public function createProcedure(string $procName): CreateProcedure {
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return new CreateProcedure($this, $procName);
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}
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// ####################
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// ### ABSTRACT METHODS
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// ####################
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// Misc
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public abstract function checkRequirements();
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public abstract function getDriverName();
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// Connection Management
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public abstract function connect();
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public abstract function disconnect();
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public function executeQuery(Query $query, bool $fetchResult = false) {
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$parameters = [];
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$queryStr = $query->build($parameters);
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if($query->dump) {
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var_dump($queryStr);
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var_dump($parameters);
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}
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if ($queryStr === null) {
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return false;
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}
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$res = $this->execute($queryStr, $parameters, $fetchResult);
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$success = ($res !== FALSE);
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// fetch generated serial ids for Insert statements
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$generatedColumn = ($query instanceof Insert ? $query->getReturning() : null);
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if($success && $generatedColumn) {
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$this->fetchReturning($res, $generatedColumn);
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}
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return $fetchResult ? $res : $success;
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}
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public function getWhereClause($conditions, &$params): string {
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if (!$conditions) {
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return "";
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} else {
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return " WHERE " . $this->buildCondition($conditions, $params);
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}
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}
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public function getConstraintDefinition(Constraint $constraint): ?string {
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$columnName = $this->columnName($constraint->getColumnNames());
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if ($constraint instanceof PrimaryKey) {
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return "PRIMARY KEY ($columnName)";
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} else if ($constraint instanceof Unique) {
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return "UNIQUE ($columnName)";
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} else if ($constraint instanceof ForeignKey) {
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$refTable = $this->tableName($constraint->getReferencedTable());
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$refColumn = $this->columnName($constraint->getReferencedColumn());
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$strategy = $constraint->onDelete();
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$code = "FOREIGN KEY ($columnName) REFERENCES $refTable ($refColumn)";
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if ($strategy instanceof SetDefaultStrategy) {
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$code .= " ON DELETE SET DEFAULT";
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} else if($strategy instanceof SetNullStrategy) {
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$code .= " ON DELETE SET NULL";
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} else if($strategy instanceof CascadeStrategy) {
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$code .= " ON DELETE CASCADE";
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}
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return $code;
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} else {
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$this->lastError = "Unsupported constraint type: " . get_class($constraint);
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return null;
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}
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}
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protected abstract function fetchReturning($res, string $returningCol);
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public abstract function getColumnDefinition(Column $column): ?string;
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public abstract function getOnDuplicateStrategy(?Strategy $strategy, &$params): ?string;
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public abstract function createTriggerBody(CreateTrigger $trigger): ?string;
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public abstract function getProcedureHead(CreateProcedure $procedure): ?string;
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public abstract function getColumnType(Column $column): ?string;
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public function getProcedureTail(): string { return ""; }
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public function getReturning(?string $columns): string { return ""; }
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public function getProcedureBody(CreateProcedure $procedure): string {
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$statements = "";
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foreach ($procedure->getStatements() as $statement) {
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$statements .= $this->buildUnsafe($statement) . ";";
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}
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return $statements;
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}
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protected function getUnsafeValue($value): ?string {
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if (is_string($value)) {
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return "'" . addslashes("$value") . "'"; // unsafe operation here...
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} else if (is_numeric($value) || is_bool($value)) {
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return $value;
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} else if ($value instanceof Column) {
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return $this->columnName($value);
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} else if ($value === null) {
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return "NULL";
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} else {
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$this->lastError = "Cannot create unsafe value of type: " . gettype($value);
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return null;
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}
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}
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protected abstract function getValueDefinition($val);
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public abstract function addValue($val, &$params = NULL, bool $unsafe = false);
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protected abstract function buildUnsafe(Query $statement): string;
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public abstract function tableName($table): string;
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public abstract function columnName($col): string;
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// Special Keywords and functions
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public function now(): CurrentTimeStamp { return new CurrentTimeStamp(); }
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public function currentTimestamp(): CurrentTimeStamp { return new CurrentTimeStamp(); }
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public function count($col = NULL): Keyword {
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if (is_null($col)) {
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return new Keyword("COUNT(*) AS count");
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} else if($col instanceof Keyword) {
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return new Keyword("COUNT(" . $col->getValue() . ") AS count");
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} else {
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$countCol = strtolower(str_replace(".","_", $col)) . "_count";
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$col = $this->columnName($col);
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return new Keyword("COUNT($col) AS $countCol");
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}
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}
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public function distinct($col): Keyword {
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$col = $this->columnName($col);
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return new Keyword("DISTINCT($col)");
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}
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// Statements
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protected abstract function execute($query, $values=NULL, $returnValues=false);
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public function buildCondition($condition, &$params) {
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if ($condition instanceof CondOr) {
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$conditions = array();
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foreach($condition->getConditions() as $cond) {
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$conditions[] = $this->buildCondition($cond, $params);
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}
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return "(" . implode(" OR ", $conditions) . ")";
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} else if ($condition instanceof CondAnd) {
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$conditions = array();
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foreach($condition->getConditions() as $cond) {
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$conditions[] = $this->buildCondition($cond, $params);
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}
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return "(" . implode(" AND ", $conditions) . ")";
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} else if ($condition instanceof Compare) {
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$column = $this->columnName($condition->getColumn());
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$value = $condition->getValue();
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$operator = $condition->getOperator();
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if ($value === null) {
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if ($operator === "=") {
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return "$column IS NULL";
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} else if ($operator === "!=") {
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return "$column IS NOT NULL";
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}
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}
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return $column . $operator . $this->addValue($value, $params);
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} else if ($condition instanceof CondBool) {
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return $this->columnName($condition->getValue());
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} else if (is_array($condition)) {
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if (count($condition) === 1) {
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return $this->buildCondition($condition[0], $params);
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} else {
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$conditions = array();
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foreach ($condition as $cond) {
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$conditions[] = $this->buildCondition($cond, $params);
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}
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return implode(" AND ", $conditions);
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}
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} else if($condition instanceof CondIn) {
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$needle = $condition->getNeedle();
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$haystack = $condition->getHaystack();
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if (is_array($haystack)) {
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$values = array();
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foreach ($haystack as $value) {
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$values[] = $this->addValue($value, $params);
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}
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$values = implode(",", $values);
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} else if($haystack instanceof Select) {
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$values = $haystack->build($params);
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} else {
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$this->lastError = "Unsupported in-expression value: " . get_class($condition);
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return false;
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}
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if ($needle instanceof Column) {
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$lhs = $this->createExpression($needle, $params);
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} else {
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$lhs = $this->addValue($needle, $params);
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}
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return "$lhs IN ($values)";
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} else if($condition instanceof CondKeyword) {
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$left = $condition->getLeftExp();
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$right = $condition->getRightExp();
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$keyword = $condition->getKeyword();
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$left = ($left instanceof Column) ? $this->columnName($left->getName()) : $this->addValue($left, $params);
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$right = ($right instanceof Column) ? $this->columnName($right->getName()) : $this->addValue($right, $params);
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return "$left $keyword $right ";
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} else if($condition instanceof CondNot) {
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$expression = $condition->getExpression();
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if ($expression instanceof Condition) {
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$expression = $this->buildCondition($expression, $params);
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} else {
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$expression = $this->columnName($expression);
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}
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return "NOT $expression";
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} else if ($condition instanceof CondNull) {
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return $this->columnName($condition->getColumn()) . " IS NULL";
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} else if ($condition instanceof Exists) {
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return "EXISTS(" .$condition->getSubQuery()->build($params) . ")";
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} else {
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$this->lastError = "Unsupported condition type: " . gettype($condition);
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return null;
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}
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}
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protected function createExpression(Expression $exp, array &$params): ?string {
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if ($exp instanceof Column) {
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return $this->columnName($exp->getName());
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} else if ($exp instanceof Query) {
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return "(" . $exp->build($params) . ")";
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} else if ($exp instanceof CaseWhen) {
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$condition = $this->buildCondition($exp->getCondition(), $params);
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// psql requires constant values here
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$trueCase = $this->addValue($exp->getTrueCase(), $params, true);
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$falseCase = $this->addValue($exp->getFalseCase(), $params, true);
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return "CASE WHEN $condition THEN $trueCase ELSE $falseCase END";
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} else if ($exp instanceof Sum) {
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$value = $this->addValue($exp->getValue(), $params);
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$alias = $this->columnName($exp->getAlias());
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return "SUM($value) AS $alias";
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} else {
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$this->lastError = "Unsupported expression type: " . get_class($exp);
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return null;
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}
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}
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public function setLastError($str) {
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$this->lastError = $str;
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}
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public function getLastInsertId(): int {
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return $this->lastInsertId;
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}
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public function close() {
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$this->disconnect();
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$this->connection = NULL;
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}
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public static function createConnection(ConnectionData $connectionData) {
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$type = $connectionData->getProperty("type");
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if ($type === "mysql") {
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$sql = new MySQL($connectionData);
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} else if ($type === "postgres") {
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$sql = new PostgreSQL($connectionData);
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} else {
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return "Unknown database type";
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}
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if ($sql->checkRequirements()) {
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$sql->connect();
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}
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return $sql;
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}
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public abstract function getStatus();
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public function parseBool($val) : bool {
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return in_array($val, array(true, 1, '1', 't', 'true', 'TRUE'), true);
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}
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} |