Some fixes / improvements

.idea/codeStyles/codeStyleConfig.xml

@@ -0,0 +1,5 @@
+<component name="ProjectCodeStyleConfiguration">
+  <state>
+    <option name="PREFERRED_PROJECT_CODE_STYLE" value="Default" />
+  </state>
+</component>

core/Api/ApiKey/Fetch.class.php

@@ -5,6 +5,7 @@ namespace Api\ApiKey;
 use \Api\Request;
 use DateTime;
 use \Driver\SQL\Condition\Compare;
+use Exception;
 
 class Fetch extends Request {
 
@@ -34,12 +35,12 @@ class Fetch extends Request {
       foreach($res as $row) {
         try {
           $validUntil = (new DateTime($row["valid_until"]))->getTimestamp();
-        } catch (\Exception $e) {
+        } catch (Exception $e) {
           $validUntil = $row["valid_until"];
         }
 
         $this->result["api_keys"][] = array(
-            "uid" => $row["uid"],
+            "uid" => intval($row["uid"]),
             "api_key" => $row["api_key"],
             "valid_until" => $validUntil,
           );

core/Driver/SQL/Column/BoolColumn.class.php

@@ -9,5 +9,3 @@ class BoolColumn extends Column {
   }
 
 }
-
-?>

core/Driver/SQL/Column/Column.class.php

@@ -4,8 +4,8 @@ namespace Driver\SQL\Column;
 
 class Column {
 
-  private $name;
-  private $nullable;
+  private string $name;
+  private bool $nullable;
   private $defaultValue;
 
   public function __construct($name, $nullable = false, $defaultValue = NULL) {
@@ -19,5 +19,3 @@ class Column {
   public function getDefaultValue() { return $this->defaultValue; }
 
 }
-
-?>

core/Driver/SQL/Column/DateTimeColumn.class.php

@@ -8,5 +8,3 @@ class DateTimeColumn extends Column {
     parent::__construct($name, $nullable, $defaultValue);
   }
 }
-
-?>

core/Driver/SQL/Column/EnumColumn.class.php

@@ -4,7 +4,7 @@ namespace Driver\SQL\Column;
 
 class EnumColumn extends Column {
 
-  private $values;
+  private array $values;
 
   public function __construct($name, $values, $nullable=false, $defaultValue=NULL) {
     parent::__construct($name, $nullable, $defaultValue);
@@ -13,5 +13,3 @@ class EnumColumn extends Column {
 
   public function getValues() { return $this->values; }
 }
-
-?>

core/Driver/SQL/Column/IntColumn.class.php

@@ -9,5 +9,3 @@ class IntColumn extends Column {
   }
 
 }
-
-?>

core/Driver/SQL/Column/JsonColumn.class.php

@@ -9,5 +9,3 @@ class JsonColumn extends Column {
   }
 
 }
-
-?>

core/Driver/SQL/Column/SerialColumn.class.php

@@ -9,5 +9,3 @@ class SerialColumn extends Column {
   }
 
 }
-
-?>

core/Driver/SQL/Column/StringColumn.class.php

@@ -4,7 +4,7 @@ namespace Driver\SQL\Column;
 
 class StringColumn extends Column {
 
-  private $maxSize;
+  private ?int $maxSize;
 
   public function __construct($name, $maxSize=null, $nullable=false, $defaultValue=null) {
     parent::__construct($name, $nullable, $defaultValue);
@@ -13,5 +13,3 @@ class StringColumn extends Column {
 
   public function getMaxSize() { return $this->maxSize; }
 }
-
-?>

core/Driver/SQL/Condition/Compare.class.php

@@ -4,6 +4,10 @@ namespace Driver\SQL\Condition;
 
 class Compare extends Condition {
 
+  private string $operator;
+  private string $column;
+  private $value;
+
   public function __construct($col, $val, $operator='=') {
     $this->operator = $operator;
     $this->column = $col;
@@ -15,5 +19,3 @@ class Compare extends Condition {
   public function getOperator() { return $this->operator; }
 
 }
-
-?>

core/Driver/SQL/Condition/CondAnd.class.php

@@ -4,7 +4,7 @@ namespace Driver\SQL\Condition;
 
 class CondAnd extends Condition {
 
-  private $conditions;
+  private array $conditions;
 
   public function __construct(...$conditions) {
     $this->conditions = $conditions;
@@ -12,5 +12,3 @@ class CondAnd extends Condition {
 
   public function getConditions() { return $this->conditions; }
 }
-
-?>

core/Driver/SQL/Condition/CondBool.class.php

@@ -4,6 +4,8 @@ namespace Driver\SQL\Condition;
 
 class CondBool extends Condition {
 
+  private $value;
+
   public function __construct($val) {
     $this->value = $val;
   }
@@ -11,5 +13,3 @@ class CondBool extends Condition {
   public function getValue() { return $this->value; }
 
 }
-
-?>

core/Driver/SQL/Condition/CondOr.class.php

@@ -4,7 +4,7 @@ namespace Driver\SQL\Condition;
 
 class CondOr extends Condition {
 
-  private $conditions;
+  private array $conditions;
 
   public function __construct(...$conditions) {
     $this->conditions = $conditions;
@@ -12,5 +12,3 @@ class CondOr extends Condition {
 
   public function getConditions() { return $this->conditions; }
 }
-
-?>

core/Driver/SQL/Condition/Condition.class.php

@@ -5,5 +5,3 @@ namespace Driver\SQL\Condition;
 abstract class Condition {
   
 }
-
-?>

core/Driver/SQL/Constraint/Constraint.class.php

@@ -4,13 +4,11 @@ namespace Driver\SQL\Constraint;
 
 abstract class Constraint {
 
-  private $columnName;
+  private array $columnNames;
 
-  public function __construct($columnName) {
-    $this->columnName = $columnName;
+  public function __construct($columnNames) {
+    $this->columnNames = (!is_array($columnNames) ? array($columnNames) : $columnNames);
   }
 
-  public function getColumnName() { return $this->columnName; }
-};
-
-?>
+  public function getColumnNames() { return $this->columnNames; }
+}

core/Driver/SQL/Constraint/ForeignKey.class.php

@@ -2,11 +2,13 @@
 
 namespace Driver\SQL\Constraint;
 
+use Driver\SQL\Strategy\Strategy;
+
 class ForeignKey extends Constraint {
 
-  private $referencedTable;
-  private $referencedColumn;
-  private $strategy;
+  private string $referencedTable;
+  private string $referencedColumn;
+  private ?Strategy $strategy;
 
   public function __construct($name, $refTable, $refColumn, $strategy = NULL) {
     parent::__construct($name);
@@ -18,6 +20,4 @@ class ForeignKey extends Constraint {
   public function getReferencedTable() { return $this->referencedTable; }
   public function getReferencedColumn() { return $this->referencedColumn; }
   public function onDelete() { return $this->strategy; }
-};
-
-?>
+}

core/Driver/SQL/Constraint/PrimaryKey.class.php

@@ -8,6 +8,4 @@ class PrimaryKey extends Constraint {
     parent::__construct((!empty($names) && is_array($names[0])) ? $names[0] : $names);
   }
 
-};
-
-?>
+}

core/Driver/SQL/Constraint/Unique.class.php

@@ -8,6 +8,4 @@ class Unique extends Constraint {
     parent::__construct((!empty($names) && is_array($names[0])) ? $names[0] : $names);
   }
 
-};
-
-?>
+}

core/Driver/SQL/Join.class.php

@@ -4,13 +4,13 @@ namespace Driver\SQL;
 
 class Join {
 
-  private $type;
-  private $table;
-  private $columnA;
-  private $columnB;
+  private string $type;
+  private string $table;
+  private string $columnA;
+  private string $columnB;
 
   public function __construct($type, $table, $columnA, $columnB) {
-    $this->tpye = $type;
+    $this->type = $type;
     $this->table = $table;
     $this->columnA = $columnA;
     $this->columnB = $columnB;
@@ -22,5 +22,3 @@ class Join {
   public function getColumnB() { return $this->columnB; }
 
 }
-
-?>

core/Driver/SQL/Keyword.class.php

@@ -4,7 +4,7 @@ namespace Driver\SQL;
 
 class Keyword {
 
-  private $value;
+  private string $value;
 
   public function __construct($value) {
     $this->value = $value;
@@ -13,5 +13,3 @@ class Keyword {
   public function getValue() { return $this->value; }
 
 }
-
-?>

core/Driver/SQL/MySQL.class.php

@@ -13,9 +13,8 @@ use \Driver\SQL\Column\DateTimeColumn;
 use Driver\SQL\Column\BoolColumn;
 use Driver\SQL\Column\JsonColumn;
 
-use \Driver\SQL\Strategy\CascadeStrategy;
-use \Driver\SQL\Strategy\SetDefaultStrategy;
-use \Driver\SQL\Strategy\SetNullStrategy;
+use Driver\SQL\Query\Insert;
+use Driver\SQL\Strategy\Strategy;
 use \Driver\SQL\Strategy\UpdateStrategy;
 
 class MySQL extends SQL {
@@ -47,7 +46,7 @@ class MySQL extends SQL {
       $this->connectionData->getPort()
     );
 
-    if (mysqli_connect_errno($this->connection)) {
+    if (mysqli_connect_errno()) {
       $this->lastError = "Failed to connect to MySQL: " . mysqli_connect_error();
       $this->connection = NULL;
       return false;
@@ -63,6 +62,7 @@ class MySQL extends SQL {
     }
 
     mysqli_close($this->connection);
+    return true;
   }
 
   public function getLastError() {
@@ -81,6 +81,8 @@ class MySQL extends SQL {
       switch($paramType) {
         case Parameter::TYPE_BOOLEAN:
           $value = $value ? 1 : 0;
+          $sqlParams[0] .= 'i';
+          break;
         case Parameter::TYPE_INT:
           $sqlParams[0] .= 'i';
           break;
@@ -161,64 +163,34 @@ class MySQL extends SQL {
     return ($success && $returnValues) ? $resultRows : $success;
   }
 
-  public function executeInsert($insert) {
-    $tableName = $this->tableName($insert->getTableName());
-    $columns = $insert->getColumns();
-    $rows = $insert->getRows();
-    $onDuplicateKey = $insert->onDuplicateKey() ?? "";
+  protected function getOnDuplicateStrategy(?Strategy $strategy, &$params) {
+    if (is_null($strategy)) {
+      return "";
+    } else if ($strategy instanceof UpdateStrategy) {
+      $updateValues = array();
+      foreach($strategy->getValues() as $key => $value) {
+        $leftColumn = $this->columnName($key);
+        if ($value instanceof Column) {
+          $columnName = $this->columnName($value->getName());
+          $updateValues[] = "$leftColumn=$columnName";
+        } else {
+          $updateValues[] = "`$leftColumn=" . $this->addValue($value, $params);
+        }
+      }
 
-    if (empty($rows)) {
-      $this->lastError = "No rows to insert given.";
+      return " ON DUPLICATE KEY UPDATE " . implode(",", $updateValues);
+    } else {
+      $strategyClass = get_class($strategy);
+      $this->lastError = "ON DUPLICATE Strategy $strategyClass is not supported yet.";
       return false;
     }
-
-    if (is_null($columns) || empty($columns)) {
-      $columns = "";
-      $numColumns = count($rows[0]);
-    } else {
-      $numColumns = count($columns);
-      $columns = " (" . $this->columnName($columns) . ")";
-    }
-
-    $numRows = count($rows);
-    $parameters = array();
-    $values = implode(",", array_fill(0, $numRows, "(" . implode(",", array_fill(0, $numColumns, "?")) . ")"));
-
-    foreach($rows as $row) {
-      $parameters = array_merge($parameters, $row);
-    }
-
-    if ($onDuplicateKey) {
-      if ($onDuplicateKey instanceof UpdateStrategy) {
-        $updateValues = array();
-        foreach($onDuplicateKey->getValues() as $key => $value) {
-          if ($value instanceof Column) {
-            $columnName = $value->getName();
-            $updateValues[] = "`$key`=`$columnName`";
-          } else {
-            $updateValues[] = "`$key`=" . $this->addValue($value, $parameters);
-          }
-        }
-
-        $onDuplicateKey = " ON DUPLICATE KEY UPDATE " . implode(",", $updateValues);
-      } else {
-        $strategy = get_class($onDuplicateKey);
-        $this->lastError = "ON DUPLICATE Strategy $strategy is not supported yet.";
-        return false;
-      }
-    }
-
-    $query = "INSERT INTO $tableName$columns VALUES$values$onDuplicateKey";
-    $success = $this->execute($query, $parameters);
-
-    if($success) {
-      $this->lastInsertId = mysqli_insert_id($this->connection);
-    }
-
-    return $success;
   }
 
-  public function getColumnDefinition($column) {
+  protected function fetchReturning($res, string $returningCol) {
+    $this->lastInsertId = mysqli_insert_id($this->connection);
+  }
+
+  public function getColumnDefinition(Column $column) {
     $columnName = $this->columnName($column->getName());
     $defaultValue = $column->getDefaultValue();
 
@@ -323,4 +295,4 @@ class MySQL extends SQL {
     return new Keyword("NOW()");
   }
 
-};
+}

core/Driver/SQL/PostgreSQL.class.php

@@ -16,6 +16,7 @@ use Driver\SQL\Column\JsonColumn;
 use \Driver\SQL\Strategy\CascadeStrategy;
 use \Driver\SQL\Strategy\SetDefaultStrategy;
 use \Driver\SQL\Strategy\SetNullStrategy;
+use Driver\SQL\Strategy\Strategy;
 use \Driver\SQL\Strategy\UpdateStrategy;
 
 class PostgreSQL extends SQL {
@@ -131,76 +132,41 @@ class PostgreSQL extends SQL {
     }
   }
 
-  // Querybuilder
-  public function executeInsert($insert) {
+  protected function getOnDuplicateStrategy(?Strategy $strategy, &$params) {
+      if (!is_null($strategy)) {
 
-    $tableName = $this->tableName($insert->getTableName());
-    $columns = $insert->getColumns();
-    $rows = $insert->getRows();
-    $onDuplicateKey = $insert->onDuplicateKey() ?? "";
+        /*if ($onDuplicateKey instanceof UpdateStrategy) {
+              $updateValues = array();
+              foreach($onDuplicateKey->getValues() as $key => $value) {
+                if ($value instanceof Column) {
+                  $columnName = $value->getName();
+                  $updateValues[] = "\"$key\"=\"$columnName\"";
+                } else {
+                  $updateValues[] = "\"$key\"=" . $this->addValue($value, $parameters);
+                }
+              }
 
-    if (empty($rows)) {
-      $this->lastError = "No rows to insert given.";
-      return false;
-    }
-
-    if (is_null($columns) || empty($columns)) {
-      $columnStr = "";
-    } else {
-      $columnStr = " (" . $this->columnName($columns) . ")";
-    }
-
-    $numRows = count($rows);
-    $parameters = array();
-
-    $values = array();
-    foreach($rows as $row) {
-      $rowPlaceHolder = array();
-      foreach($row as $val) {
-        $rowPlaceHolder[] = $this->addValue($val, $parameters);
-      }
-
-      $values[] = "(" . implode(",", $rowPlaceHolder) . ")";
-    }
-
-    $values = implode(",", $values);
-
-    if ($onDuplicateKey) {
-      /*if ($onDuplicateKey instanceof UpdateStrategy) {
-        $updateValues = array();
-        foreach($onDuplicateKey->getValues() as $key => $value) {
-          if ($value instanceof Column) {
-            $columnName = $value->getName();
-            $updateValues[] = "\"$key\"=\"$columnName\"";
-          } else {
-            $updateValues[] = "\"$key\"=" . $this->addValue($value, $parameters);
-          }
+              $onDuplicateKey = " ON CONFLICT DO UPDATE SET " . implode(",", $updateValues);
+            } else*/ {
+          $strategyClass = get_class($strategy);
+          $this->lastError = "ON DUPLICATE Strategy $strategyClass is not supported yet.";
+          return false;
         }
-
-        $onDuplicateKey = " ON CONFLICT DO UPDATE SET " . implode(",", $updateValues);
-      } else*/ {
-        $strategy = get_class($onDuplicateKey);
-        $this->lastError = "ON DUPLICATE Strategy $strategy is not supported yet.";
-        return false;
+      } else {
+        return "";
       }
-    }
+  }
 
-    $returningCol = $insert->getReturning();
-    $returning = $returningCol ? (" RETURNING " . $this->columnName($returningCol)) : "";
+  protected function getReturning(?string $columns) {
+    return $columns ? (" RETURNING " . $this->columnName($columns)) : "";
+  }
 
-    $query = "INSERT INTO $tableName$columnStr VALUES$values$onDuplicateKey$returning";
-    $res = $this->execute($query, $parameters, !empty($returning));
-    $success = ($res !== FALSE);
-
-    if($success && !empty($returning)) {
-      $this->lastInsertId = $res[0][$returningCol];
-    }
-
-    return $success;
+  protected function fetchReturning($res, string $returningCol) {
+    $this->lastInsertId = $res[0][$returningCol];
   }
 
   // UGLY but.. what should i do?
-  private function createEnum($enumColumn) {
+  private function createEnum(EnumColumn $enumColumn) {
     $typeName = $enumColumn->getName();
     if(!endsWith($typeName, "_type")) {
       $typeName = "${typeName}_type";
@@ -320,4 +286,3 @@ class PostgreSQL extends SQL {
     return new Keyword("CURRENT_TIMESTAMP");
   }
 }
-?>

core/Driver/SQL/Query/CreateTable.class.php

@@ -16,10 +16,10 @@ use Driver\SQL\Constraint\ForeignKey;
 
 class CreateTable extends Query {
 
-  private $tableName;
-  private $columns;
-  private $constraints;
-  private $ifNotExists;
+  private string $tableName;
+  private array $columns;
+  private array $constraints;
+  private bool $ifNotExists;
 
   public function __construct($sql, $name) {
     parent::__construct($sql);
@@ -92,6 +92,4 @@ class CreateTable extends Query {
   public function getTableName() { return $this->tableName; }
   public function getColumns() { return $this->columns; }
   public function getConstraints() { return $this->constraints; }
-};
-
-?>
+}

core/Driver/SQL/Query/Delete.class.php

@@ -4,8 +4,8 @@ namespace Driver\SQL\Query;
 
 class Delete extends Query {
 
-  private $table;
-  private $conditions;
+  private string $table;
+  private array $conditions;
 
   public function __construct($sql, $table) {
     parent::__construct($sql);
@@ -24,6 +24,4 @@ class Delete extends Query {
 
   public function getTable() { return $this->table; }
   public function getConditions() { return $this->conditions; }
-};
-
-?>
+}

core/Driver/SQL/Query/Insert.class.php

@@ -2,13 +2,15 @@
 
 namespace Driver\SQL\Query;
 
+use Driver\SQL\Strategy\Strategy;
+
 class Insert extends Query {
 
-  private $tableName;
-  private $columns;
-  private $rows;
-  private $onDuplicateKey;
-  private $returning;
+  private string $tableName;
+  private array $columns;
+  private array $rows;
+  private ?Strategy $onDuplicateKey;
+  private ?string $returning;
 
   public function __construct($sql, $name, $columns=array()) {
     parent::__construct($sql);
@@ -43,6 +45,4 @@ class Insert extends Query {
   public function getRows() { return $this->rows; }
   public function onDuplicateKey() { return $this->onDuplicateKey; }
   public function getReturning() { return $this->returning; }
-};
-
-?>
+}

core/Driver/SQL/Query/Query.class.php

@@ -2,9 +2,11 @@
 
 namespace Driver\SQL\Query;
 
+use Driver\SQL\SQL;
+
 abstract class Query {
 
-  protected $sql;
+  protected SQL $sql;
 
   public function __construct($sql) {
     $this->sql = $sql;
@@ -12,6 +14,4 @@ abstract class Query {
 
   public abstract function execute();
 
-};
-
-?>
+}

core/Driver/SQL/Query/Select.class.php

@@ -2,16 +2,18 @@
 
 namespace Driver\SQL\Query;
 
+use Driver\SQL\Join;
+
 class Select extends Query {
 
-  private $columns;
-  private $tables;
-  private $conditions;
-  private $joins;
-  private $orderColumns;
-  private $sortAscending;
-  private $limit;
-  private $offset;
+  private array $columns;
+  private array $tables;
+  private array $conditions;
+  private array $joins;
+  private array $orderColumns;
+  private bool $sortAscending;
+  private int $limit;
+  private int $offset;
 
   public function __construct($sql, ...$columns) {
     parent::__construct($sql);
@@ -36,12 +38,12 @@ class Select extends Query {
   }
 
   public function innerJoin($table, $columnA, $columnB) {
-    $this->joins[] = new \Driver\SQL\Join("INNER", $table, $columnA, $columnB);
+    $this->joins[] = new Join("INNER", $table, $columnA, $columnB);
     return $this;
   }
 
   public function leftJoin($table, $columnA, $columnB) {
-    $this->joins[] = new \Driver\SQL\Join("LEFT", $table, $columnA, $columnB);
+    $this->joins[] = new Join("LEFT", $table, $columnA, $columnB);
     return $this;
   }
 
@@ -51,12 +53,12 @@ class Select extends Query {
   }
 
   public function ascending() {
-    $this->ascending = true;
+    $this->sortAscending = true;
     return $this;
   }
 
   public function descending() {
-    $this->ascending = false;
+    $this->sortAscending = false;
     return $this;
   }
 
@@ -78,11 +80,9 @@ class Select extends Query {
   public function getTables() { return $this->tables; }
   public function getConditions() { return $this->conditions; }
   public function getJoins() { return $this->joins; }
-  public function isOrderedAscending() { return $this->ascending; }
+  public function isOrderedAscending() { return $this->sortAscending; }
   public function getOrderBy() { return $this->orderColumns; }
   public function getLimit() { return $this->limit; }
   public function getOffset() { return $this->offset; }
 
-};
-
-?>
+}

core/Driver/SQL/Query/Truncate.class.php

@@ -4,7 +4,7 @@ namespace Driver\SQL\Query;
 
 class Truncate extends Query {
 
-  private $tableName;
+  private string $tableName;
 
   public function __construct($sql, $name) {
     parent::__construct($sql);
@@ -15,7 +15,5 @@ class Truncate extends Query {
     return $this->sql->executeTruncate($this);
   }
 
-  public function getTableName() { return $this->tableName; }
-};
-
-?>
+  public function getTable() { return $this->tableName; }
+}

core/Driver/SQL/Query/Update.class.php

@@ -4,9 +4,9 @@ namespace Driver\SQL\Query;
 
 class Update extends Query {
 
-  private $values;
-  private $table;
-  private $conditions;
+  private array $values;
+  private string $table;
+  private array $conditions;
 
   public function __construct($sql, $table) {
     parent::__construct($sql);
@@ -32,6 +32,4 @@ class Update extends Query {
   public function getTable() { return $this->table; }
   public function getConditions() { return $this->conditions; }
   public function getValues() { return $this->values; }
-};
-
-?>
+}

core/Driver/SQL/SQL.class.php

@@ -2,16 +2,32 @@
 
 namespace Driver\SQL;
 
+use Driver\SQL\Column\Column;
+use Driver\SQL\Condition\Compare;
+use Driver\SQL\Condition\CondBool;
+use Driver\SQL\Condition\CondOr;
+use Driver\SQL\Constraint\Constraint;
 use \Driver\SQL\Constraint\Unique;
 use \Driver\SQL\Constraint\PrimaryKey;
 use \Driver\SQL\Constraint\ForeignKey;
+use Driver\SQL\Query\CreateTable;
+use Driver\SQL\Query\Delete;
+use Driver\SQL\Query\Insert;
+use Driver\SQL\Query\Select;
+use Driver\SQL\Query\Truncate;
+use Driver\SQL\Query\Update;
+use Driver\SQL\Strategy\CascadeStrategy;
+use Driver\SQL\Strategy\SetDefaultStrategy;
+use Driver\SQL\Strategy\SetNullStrategy;
+use Driver\SQL\Strategy\Strategy;
+use Objects\ConnectionData;
 
 abstract class SQL {
 
-  protected $lastError;
+  protected string $lastError;
   protected $connection;
-  protected $connectionData;
-  protected $lastInsertId;
+  protected ConnectionData $connectionData;
+  protected int $lastInsertId;
 
   public function __construct($connectionData) {
     $this->connection = NULL;
@@ -65,7 +81,7 @@ abstract class SQL {
   public abstract function disconnect();
 
   // Querybuilder
-  public function executeCreateTable($createTable) {
+  public function executeCreateTable(CreateTable $createTable) {
     $tableName = $this->tableName($createTable->getTableName());
     $ifNotExists = $createTable->ifNotExists() ? " IF NOT EXISTS": "";
 
@@ -89,10 +105,56 @@ abstract class SQL {
     return $this->execute($query);
   }
 
-  // TODO pull this function up
-  public abstract function executeInsert($query);
+  public function executeInsert(Insert $insert) {
 
-  public function executeSelect($select) {
+    $tableName = $this->tableName($insert->getTableName());
+    $columns = $insert->getColumns();
+    $rows = $insert->getRows();
+
+    if (empty($rows)) {
+      $this->lastError = "No rows to insert given.";
+      return false;
+    }
+
+    if (is_null($columns) || empty($columns)) {
+      $columnStr = "";
+    } else {
+      $columnStr = " (" . $this->columnName($columns) . ")";
+    }
+
+    $parameters = array();
+    $values = array();
+    foreach($rows as $row) {
+      $rowPlaceHolder = array();
+      foreach($row as $val) {
+        $rowPlaceHolder[] = $this->addValue($val, $parameters);
+      }
+
+      $values[] = "(" . implode(",", $rowPlaceHolder) . ")";
+    }
+
+    $values = implode(",", $values);
+
+    $onDuplicateKey = $this->getOnDuplicateStrategy($insert->onDuplicateKey(), $parameters);
+    if ($onDuplicateKey === FALSE) {
+      return false;
+    }
+
+    $returningCol = $insert->getReturning();
+    $returning = $this->getReturning($returningCol);
+
+    $query = "INSERT INTO $tableName$columnStr VALUES$values$onDuplicateKey$returning";
+    $res = $this->execute($query, $parameters, !empty($returning));
+    $success = ($res !== FALSE);
+
+    if($success && $returningCol) {
+      $this->fetchReturning($res, $returningCol);
+    }
+
+    return $success;
+  }
+
+  public function executeSelect(Select $select) {
 
     $columns = $this->columnName($select->getColumns());
     $tables = $select->getTables();
@@ -130,7 +192,7 @@ abstract class SQL {
     return $this->execute($query, $params, true);
   }
 
-  public function executeDelete($delete) {
+  public function executeDelete(Delete $delete) {
 
     $table = $this->tableName($delete->getTable());
     $where = $this->getWhereClause($delete->getConditions(), $params);
@@ -139,11 +201,11 @@ abstract class SQL {
     return $this->execute($query);
   }
 
-  public function executeTruncate($truncate) {
+  public function executeTruncate(Truncate $truncate) {
     return $this->execute("TRUNCATE " . $truncate->getTable());
   }
 
-  public function executeUpdate($update) {
+  public function executeUpdate(Update $update) {
 
     $params = array();
     $table = $this->tableName($update->getTable());
@@ -167,10 +229,8 @@ abstract class SQL {
     }
   }
 
-  protected abstract function getColumnDefinition($column);
-
-  public function getConstraintDefinition($constraint) {
-    $columnName = $this->columnName($constraint->getColumnName());
+  public function getConstraintDefinition(Constraint $constraint) {
+    $columnName = $this->columnName($constraint->getColumnNames());
     if ($constraint instanceof PrimaryKey) {
       return "PRIMARY KEY ($columnName)";
     } else if ($constraint instanceof Unique) {
@@ -190,10 +250,19 @@ abstract class SQL {
 
       return $code;
     } else {
-      $this->lastError = "Unsupported constraint type: " . get_class($strategy);
+      $this->lastError = "Unsupported constraint type: " . get_class($constraint);
+      return false;
     }
   }
 
+  protected function getReturning(?string $columns) {
+    return "";
+  }
+
+  protected abstract function getColumnDefinition(Column $column);
+  protected abstract function fetchReturning($res, string $returningCol);
+  protected abstract function getOnDuplicateStrategy(?Strategy $strategy, &$params);
+
   protected abstract function getValueDefinition($val);
   protected abstract function addValue($val, &$params);
 
@@ -221,18 +290,18 @@ abstract class SQL {
   protected abstract function execute($query, $values=NULL, $returnValues=false);
 
   protected function buildCondition($condition, &$params) {
-    if ($condition instanceof \Driver\SQL\Condition\CondOr) {
+    if ($condition instanceof CondOr) {
       $conditions = array();
       foreach($condition->getConditions() as $cond) {
         $conditions[] = $this->buildCondition($cond, $params);
       }
       return "(" . implode(" OR ", $conditions) . ")";
-    } else if ($condition instanceof \Driver\SQL\Condition\Compare) {
+    } else if ($condition instanceof Compare) {
       $column = $this->columnName($condition->getColumn());
       $value = $condition->getValue();
       $operator = $condition->getOperator();
       return $column . $operator . $this->addValue($value, $params);
-    } else if ($condition instanceof \Driver\SQL\Condition\CondBool) {
+    } else if ($condition instanceof CondBool) {
       return $this->columnName($condition->getValue());
     } else if (is_array($condition)) {
       if (count($condition) == 1) {
@@ -244,6 +313,9 @@ abstract class SQL {
         }
         return implode(" AND ", $conditions);
       }
+    } else {
+      $this->lastError = "Unsupported condition type: " . get_class($condition);
+      return false;
     }
   }
 
@@ -260,7 +332,7 @@ abstract class SQL {
     $this->connection = NULL;
   }
 
-  public static function createConnection($connectionData) {
+  public static function createConnection(ConnectionData $connectionData) {
     $type = $connectionData->getProperty("type");
     if ($type === "mysql") {
       $sql = new MySQL($connectionData);
@@ -280,5 +352,3 @@ abstract class SQL {
     return $sql;
   }
 }
-
-?>

core/Driver/SQL/Strategy/CascadeStrategy.class.php

@@ -7,6 +7,4 @@ class CascadeStrategy extends Strategy {
   public function __construct() {
   }
 
-};
-
-?>
+}

core/Driver/SQL/Strategy/SetDefaultStrategy.class.php

@@ -7,6 +7,4 @@ class SetDefaultStrategy extends Strategy {
   public function __construct() {
   }
 
-};
-
-?>
+}

core/Driver/SQL/Strategy/SetNullStrategy.class.php

@@ -7,6 +7,4 @@ class SetNullStrategy extends Strategy {
   public function __construct() {
   }
 
-};
-
-?>
+}

core/Driver/SQL/Strategy/Strategy.class.php

@@ -4,6 +4,4 @@ namespace Driver\SQL\Strategy;
 
 abstract class Strategy {
 
-};
-
-?>
+}

core/Driver/SQL/Strategy/UpdateStrategy.class.php

@@ -4,13 +4,11 @@ namespace Driver\SQL\Strategy;
 
 class UpdateStrategy extends Strategy {
 
-  private $values;
+  private array $values;
 
   public function __construct($values) {
     $this->values = $values;
   }
 
   public function getValues() { return $this->values; }
-};
-
-?>
+}

core/Elements/Script.class.php

@@ -34,18 +34,16 @@ class Script extends \View {
 
   private string $type;
   private string $content;
-  private string $url;
+  private string $src;
 
   function __construct($type, $src, $content = "") {
+    $this->src = $src;
     $this->type = $type;
     $this->content = $content;
   }
 
   function getCode() {
-    $src = (empty($this->url) ? "" : " src=\"$this->url\"");
-    $script = "<script type=\"$this->type\"$src>";
-    $script .= $this->content;
-    $script .= '</script>';
-    return $script;
+    $src = (empty($this->src) ? "" : " src=\"$this->src\"");
+      return "<script type=\"$this->type\"$src>$this->content</script>";
   }
 }