Database abstraction

core/Driver/SQL/SQL.class.php

@@ -0,0 +1,186 @@
+<?php
+
+namespace Driver\SQL;
+
+abstract class SQL {
+
+  protected $lastError;
+  protected $connection;
+  protected $connectionData;
+  protected $lastInsertId;
+  private $type;
+
+  public function __construct($type, $connectionData) {
+    $this->type = $type;
+    $this->connection = NULL;
+    $this->lastError = 'Not connected';
+    $this->connectionData = $connectionData;
+    $this->lastInsertId = 0;
+  }
+
+  public abstract function connect();
+  public abstract function disconnect();
+
+  public function isConnected() {
+    return !is_null($this->connection);
+  }
+
+  public function getLastError() {
+    return trim($this->lastError);
+  }
+
+  // public function executeQuery($query) {
+  //   if(!$this->isConnected()) {
+  //     $this->lastError = "Database is not connected yet.";
+  //     return false;
+  //   }
+  //
+  //   return $query->execute($this);
+  //   // var_dump($generatedQuery);
+  //   // return $this->execute($generatedQuery);
+  // }
+
+  public function createTable($tableName) {
+    return new Query\CreateTable($this, $tableName);
+  }
+
+  public function insert($tableName, $columns=array()) {
+    return new Query\Insert($this, $tableName, $columns);
+  }
+
+  public function select(...$columNames) {
+    return new Query\Select($this, $columNames);
+  }
+
+  public function truncate($table) {
+    return new Query\Truncate($this, $table);
+  }
+
+  public function delete($table) {
+    return new Query\Delete($this, $table);
+  }
+
+  public function update($table) {
+    return new Query\Update($this, $table);
+  }
+
+  // Querybuilder
+  public abstract function executeCreateTable($query);
+  public abstract function executeInsert($query);
+  public abstract function executeSelect($query);
+  public abstract function executeDelete($query);
+  public abstract function executeTruncate($query);
+  public abstract function executeUpdate($query);
+
+  //
+  public abstract function currentTimestamp();
+
+  protected abstract function getColumnDefinition($column);
+  protected abstract function getConstraintDefinition($constraint);
+  protected abstract function getValueDefinition($val);
+  protected abstract function buildCondition($conditions, &$params);
+
+  // Execute
+  protected abstract function execute($query, $values=NULL, $returnValues=false);
+
+  public function setLastError($str) {
+    $this->lastError = $str;
+  }
+
+  protected function addValue($val, &$params) {
+    if ($val instanceof Keyword) {
+      return $val->getValue();
+    } else {
+      $params[] = $val;
+      return "?";
+    }
+  }
+
+  /*public function getLastErrorNumber() {
+    return mysqli_errno($this->connection);
+  }*/
+
+  public function getLastInsertId() {
+    return $this->lastInsertId;
+  }
+
+  public function close() {
+    if(!is_null($this->connection)) {
+      $this->connection->close();
+    }
+  }
+
+  /*public function getAffectedRows() {
+    return $this->connection->affected_rows;
+  }*/
+
+  /*
+  public function execute($query) {
+    if(!$this->isConnected()) {
+      return false;
+    }
+
+    if(!mysqli_query($this->connection, $query)) {
+      $this->lastError = mysqli_error($this->connection);
+      return false;
+    }
+
+    return true;
+  }
+
+  public function executeMulti($queries) {
+    if(!$this->isConnected()) {
+      return false;
+    }
+
+    if(!$this->connection->multi_query($queries)) {
+      $this->lastError = mysqli_error($this->connection);
+      return false;
+    }
+
+    while (($success = $this->connection->next_result())) {
+      if (!$this->connection->more_results()) break;
+    }
+
+    if(!$success) {
+      $this->lastError = mysqli_error($this->connection);
+      return false;
+    }
+
+    return true;
+  }
+
+  public function query($query) {
+    if(!$this->isConnected()) {
+      return false;
+    }
+
+    $res = mysqli_query($this->connection, $query);
+    if(!$res) {
+      $this->lastError = mysqli_error($this->connection);
+      return false;
+    }
+
+    return $res;
+  }
+  */
+
+  public static function createConnection($connectionData) {
+    $type = $connectionData->getProperty("type");
+    if ($type === "mysql") {
+      $sql = new MySQL($connectionData);
+    /*} else if ($type === "postgres") {
+      // $sql = new PostgreSQL($connectionData);
+    } else if ($type === "oracle") {
+      // $sql = new OracleSQL($connectionData);
+    */
+    } else {
+      return "Unknown database type";
+    }
+
+    $sql->connect();
+    return $sql;
+  }
+}
+
+?>