374 lines
11 KiB
PHP
374 lines
11 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\CondBool;
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use Driver\SQL\Condition\CondOr;
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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\Query\CreateTable;
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use Driver\SQL\Query\Delete;
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use Driver\SQL\Query\Insert;
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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() {
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return !is_null($this->connection);
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}
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public function getLastError() {
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return trim($this->lastError);
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}
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public function createTable($tableName) {
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return new Query\CreateTable($this, $tableName);
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}
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public function insert($tableName, $columns=array()) {
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return new Query\Insert($this, $tableName, $columns);
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}
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public function select(...$columNames) {
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return new Query\Select($this, $columNames);
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}
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public function truncate($table) {
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return new Query\Truncate($this, $table);
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}
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public function delete($table) {
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return new Query\Delete($this, $table);
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}
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public function update($table) {
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return new Query\Update($this, $table);
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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 Managment
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public abstract function connect();
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public abstract function disconnect();
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// Querybuilder
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public function executeCreateTable(CreateTable $createTable) {
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$tableName = $this->tableName($createTable->getTableName());
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$ifNotExists = $createTable->ifNotExists() ? " IF NOT EXISTS": "";
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$entries = array();
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foreach($createTable->getColumns() as $column) {
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$entries[] = ($tmp = $this->getColumnDefinition($column));
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if (is_null($tmp)) {
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return false;
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}
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}
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foreach($createTable->getConstraints() as $constraint) {
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$entries[] = ($tmp = $this->getConstraintDefinition($constraint));
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if (is_null($tmp)) {
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return false;
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}
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}
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$entries = implode(",", $entries);
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$query = "CREATE TABLE$ifNotExists $tableName ($entries)";
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return $this->execute($query);
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}
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public function executeInsert(Insert $insert) {
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$tableName = $this->tableName($insert->getTableName());
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$columns = $insert->getColumns();
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$rows = $insert->getRows();
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if (empty($rows)) {
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$this->lastError = "No rows to insert given.";
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return false;
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}
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if (is_null($columns) || empty($columns)) {
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$columnStr = "";
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} else {
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$columnStr = " (" . $this->columnName($columns) . ")";
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}
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$parameters = array();
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$values = array();
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foreach($rows as $row) {
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$rowPlaceHolder = array();
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foreach($row as $val) {
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$rowPlaceHolder[] = $this->addValue($val, $parameters);
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}
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$values[] = "(" . implode(",", $rowPlaceHolder) . ")";
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}
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$values = implode(",", $values);
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$onDuplicateKey = $this->getOnDuplicateStrategy($insert->onDuplicateKey(), $parameters);
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if ($onDuplicateKey === FALSE) {
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return false;
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}
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$returningCol = $insert->getReturning();
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$returning = $this->getReturning($returningCol);
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$query = "INSERT INTO $tableName$columnStr VALUES $values$onDuplicateKey$returning";
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if($insert->dump) { var_dump($query); var_dump($parameters); }
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$res = $this->execute($query, $parameters, !empty($returning));
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$success = ($res !== FALSE);
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if($success && $returningCol) {
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$this->fetchReturning($res, $returningCol);
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}
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return $success;
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}
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public function executeSelect(Select $select) {
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$columns = $this->columnName($select->getColumns());
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$tables = $select->getTables();
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$params = array();
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if (!$tables) {
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return $this->execute("SELECT $columns", $params, true);
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}
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$tables = $this->tableName($tables);
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$where = $this->getWhereClause($select->getConditions(), $params);
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$joinStr = "";
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$joins = $select->getJoins();
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if (!empty($joins)) {
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foreach($joins as $join) {
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$type = $join->getType();
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$joinTable = $this->tableName($join->getTable());
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$columnA = $this->columnName($join->getColumnA());
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$columnB = $this->columnName($join->getColumnB());
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$joinStr .= " $type JOIN $joinTable ON $columnA=$columnB";
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}
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}
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$groupBy = "";
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$groupColumns = $select->getGroupBy();
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if (!empty($groupColumns)) {
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$groupBy = " GROUP BY " . $this->columnName($groupColumns);
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}
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$orderBy = "";
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$orderColumns = $select->getOrderBy();
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if (!empty($orderColumns)) {
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$orderBy = " ORDER BY " . $this->columnName($orderColumns);
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$orderBy .= ($select->isOrderedAscending() ? " ASC" : " DESC");
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}
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$limit = ($select->getLimit() > 0 ? (" LIMIT " . $select->getLimit()) : "");
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$offset = ($select->getOffset() > 0 ? (" OFFSET " . $select->getOffset()) : "");
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$query = "SELECT $columns FROM $tables$joinStr$where$groupBy$orderBy$limit$offset";
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if($select->dump) { var_dump($query); var_dump($params); }
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return $this->execute($query, $params, true);
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}
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public function executeDelete(Delete $delete) {
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$table = $this->tableName($delete->getTable());
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$where = $this->getWhereClause($delete->getConditions(), $params);
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$query = "DELETE FROM $table$where";
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if($delete->dump) { var_dump($query); }
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return $this->execute($query);
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}
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public function executeTruncate(Truncate $truncate) {
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return $this->execute("TRUNCATE " . $truncate->getTable());
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}
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public function executeUpdate(Update $update) {
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$params = array();
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$table = $this->tableName($update->getTable());
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$valueStr = array();
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foreach($update->getValues() as $key => $val) {
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$valueStr[] = "$key=" . $this->addValue($val, $params);
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}
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$valueStr = implode(",", $valueStr);
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$where = $this->getWhereClause($update->getConditions(), $params);
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$query = "UPDATE $table SET $valueStr$where";
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if($update->dump) { var_dump($query); var_dump($params); }
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return $this->execute($query, $params);
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}
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protected function getWhereClause($conditions, &$params) {
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if (!$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 $constraint) {
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$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 false;
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}
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}
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protected function getReturning(?string $columns) {
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return "";
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}
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protected abstract function getColumnDefinition(Column $column);
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protected abstract function fetchReturning($res, string $returningCol);
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protected abstract function getOnDuplicateStrategy(?Strategy $strategy, &$params);
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protected abstract function getValueDefinition($val);
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protected abstract function addValue($val, &$params);
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protected abstract function tableName($table);
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protected abstract function columnName($col);
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// Special Keywords and functions
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public abstract function currentTimestamp();
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public function count($col = NULL) {
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if (is_null($col)) {
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return new Keyword("COUNT(*) AS count");
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} else {
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$countCol = strtolower(str_replace(".","_", $col)) . "_count";
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$col = $this->columnName($col);
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return new Keyword("COUNT($col) AS $countCol");
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}
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}
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public function sum($col) {
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$sumCol = strtolower(str_replace(".","_", $col)) . "_sum";
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$col = $this->columnName($col);
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return new Keyword("SUM($col) AS $sumCol");
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}
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public function distinct($col) {
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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, $returnValues=false);
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protected function buildCondition($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 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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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 ", $conditions);
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}
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} else {
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$this->lastError = "Unsupported condition type: " . get_class($condition);
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return false;
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}
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}
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public function setLastError($str) {
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$this->lastError = $str;
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}
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public function getLastInsertId() {
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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($connectionData);
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/*} else if ($type === "oracle") {
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// $sql = new OracleSQL($connectionData);
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*/
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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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} |