move from old repository

Schema.php

@@ -0,0 +1,78 @@
+<?php
+namespace DatabaseHelper;
+
+use DatabaseHelper\enums\Charset;
+use DatabaseHelper\enums\Collation;
+use DatabaseHelper\enums\Engine;
+use http\Exception\InvalidArgumentException;
+
+class Schema
+{
+    public string $name = '';
+
+    public array $columns = [];
+    public array $primaryKey = [];
+    public array $foreignKeys = [];
+
+    public Engine $engine = Engine::INNODB;
+    public Charset $charset = Charset::UTF8;
+    public Collation $collation = Collation::UTF8_GENERAL_CI;
+
+    public function __construct(string $name) {
+        $this->name = $name;
+    }
+
+    public function requireColumn(string $col): void {
+        if (!$this->existsColumn($col))
+            throw new InvalidArgumentException("Column '$col' is not defined.");
+    }
+
+    public function existsColumn(string $col): bool {
+        return isset($this->columns[$col]);
+    }
+
+    public function existsReference(Schema $schema): bool {
+        foreach ($this->foreignKeys as $foreignKey)
+            if ($foreignKey['table'] == $schema->name)
+                return true;
+        return false;
+    }
+
+    public function columnType(string $col) {
+        return $this->columns[$col]['type'];
+    }
+
+    public function primaryKey() {
+        return $this->columns['primary']['name'];
+    }
+
+    /**
+     * Creates a deep copy of this instance.
+     * @return Schema
+     */
+    public function copy(): Schema {
+        $copy = new Schema($this->name);
+        $copy->columns = genericDeepCopy($this->columns);
+        $copy->primaryKey = genericDeepCopy($this->primaryKey);
+        $copy->foreignKeys = genericDeepCopy($this->foreignKeys);
+        $copy->engine = $this->engine;
+        $copy->charset = $this->charset;
+        $copy->collation = $this->collation;
+        return $copy;
+    }
+
+    public function include(Schema $other): void {
+        // Create a copy of the other schema.
+        $otherCopy = $other->copy();
+
+        // Add any column that isn't already defined.
+        foreach ($otherCopy->columns as $colName => $colDef)
+            if (!isset($this->columns[$colName]))
+                $this->columns[$colName] = $colDef;
+
+        // Add any foreign key that doesn't already exist.
+        foreach ($other->foreignKeys as $colName => $foreignKey)
+            if (!isset($this->foreignKeys[$colName]))
+                $this->foreignKeys[$colName] = $foreignKey;
+    }
+}