move from old repository

Deletion.php

@@ -0,0 +1,62 @@
+<?php
+namespace DatabaseHelper;
+
+use Exception;
+use InvalidArgumentException;
+
+class Deletion
+{
+    use Conditionable;
+
+    protected Schema $table;
+
+    public function __construct(Schema $table) {
+        $this->table = $table;
+    }
+
+    /**
+     * Generates the SQL statement.
+     * @return string SQL query.
+     * @throws InvalidArgumentException
+     */
+    public function toSql(): string {
+        $table = $this->table->name;
+        $whereClause = $this->combineConditions();
+
+        if (!$this->isConditioned())
+            throw new InvalidArgumentException("Deletions need to be conditioned.");
+
+        return esc_sql("DELETE FROM $table WHERE $whereClause");
+    }
+
+    /**
+     * Executes the DELETE query.
+     * @return int Number of affected rows.
+     * @throws Exception
+     */
+    public function delete(): int {
+        global $wpdb;
+        $query = $this->toSql();
+        $result = $wpdb->query($query);
+
+        if ($result === false)
+            throw new Exception("Deletion failed: " . $wpdb->last_error . ".");
+        return intval($result);
+    }
+
+    /**
+     * Clears all entries from the table.
+     * @return int Number of affected rows.
+     * @throws Exception
+     */
+    public function truncate(): int {
+        global $wpdb;
+        $table = $this->table->name;
+        $query = esc_sql("TRUNCATE TABLE $table");
+        $result = $wpdb->query($query);
+
+        if ($result === false)
+            throw new Exception("Truncation failed: " . $wpdb->last_error . ".");
+        return intval($result);
+    }
+}