Base setup for displaying groups and listing members

includes/DatabaseHandler.php

@@ -0,0 +1,46 @@
+<?php
+declare(strict_types=1);
+
+namespace Bdp\Libs;
+
+class DatabaseHandler {
+	public function readFromDb(string $table, array $conditions = []) : array {
+		global $wpdb;
+		$sql = 'SELECT * FROM ' . $wpdb->prefix . $table . $this->parseConditions($conditions);
+		return $this->getResults( $sql );
+	}
+
+	public function readSqlFromDb(string $tableName, string $preparedSql) : array
+	{
+		global $wpdb;
+		$sql = str_replace('%tablename%', $wpdb->prefix . $tableName, $preparedSql );
+		return $this->getResults($sql);
+	}
+
+	public function countSqlRows(string $tableName, array $conditions = []) : int
+	{
+		global $wpdb;
+		$sql = 'SELECT COUNT(*) as count_data FROM ' . $wpdb->prefix . $tableName . $this->parseConditions($conditions);
+		$res = $this->getResults( $sql );
+		$res = $res[0];
+		return (int)$res->count_data;
+	}
+
+	private function getResults(string $sql) : array
+	{
+		global $wpdb;
+		return $wpdb->get_results($sql, OBJECT );
+	}
+
+	private function parseConditions(array $conditionArray) : string
+	{
+		global $wpdb;
+		$_tmpArr = [];
+		foreach ($conditionArray as $key => $value) {
+			$_tmpArr[] = '`' . $key .'` = "' . $wpdb->_real_escape($value) . '"';
+		}
+
+		$returnString = implode(' AND ', $_tmpArr);
+		return $returnString !== '' ? (' WHERE ' . $returnString) : '';
+	}
+}