feat: Make methods for reading DB public

make methods to read and related tasks for constructing read queries
public so other components can make use of it (i.e. external API that
needs to use custom query)

lib/DatabaseCommand.php

@@ -242,6 +242,34 @@ class DatabaseCommand
         }
     }
 
+    public function read($query, $params): PDOStatement
+    {
+        return $this->conn->read($query, $params);
+    }
+
+    public function isPgsql(): bool
+    {
+        return $this->conn->getDriver() === 'pgsql';
+    }
+
+    public function isMysql(): bool
+    {
+        return $this->conn->getDriver() === 'mysql';
+    }
+
+    public function escapeCol($col_name): string
+    {
+        return $this->escape_char . $col_name . $this->escape_char;
+    }
+
+    public function escapeCols($col_names): string
+    {
+        return $this->escape_char . implode(
+            $this->escape_char . ',' . $this->escape_char,
+            $col_names
+        ) . $this->escape_char;
+    }
+
     private function insertLogin($entities, $userId, $date)
     {
         foreach (Config::SIDES as $side) {
@@ -265,11 +293,6 @@ class DatabaseCommand
         }
     }
 
-    private function escapeCol($col_name): string
-    {
-        return $this->escape_char . $col_name . $this->escape_char;
-    }
-
     private function writeLogin($date, $ids, $user): bool
     {
         if (empty($user)) {
@@ -475,14 +498,6 @@ class DatabaseCommand
         return ':' . $str;
     }
 
-    private function escapeCols($col_names): string
-    {
-        return $this->escape_char . implode(
-            $this->escape_char . ',' . $this->escape_char,
-            $col_names
-        ) . $this->escape_char;
-    }
-
     private function getAggregateGroupBy($ids): string
     {
         $columns = ['day'];
@@ -532,21 +547,6 @@ class DatabaseCommand
         return $displayName;
     }
 
-    private function read($query, $params): PDOStatement
-    {
-        return $this->conn->read($query, $params);
-    }
-
-    private function isPgsql(): bool
-    {
-        return $this->conn->getDriver() === 'pgsql';
-    }
-
-    private function isMysql(): bool
-    {
-        return $this->conn->getDriver() === 'mysql';
-    }
-
     private function unknownDriver()
     {
         Logger::error(self::DEBUG_PREFIX . 'unsupported DB driver \'' . $this->conn->getDriver());