Added some of the database utilities from Misuzu to Index.

VERSION

@@ -1 +1 @@
-0.2307.211801
+0.2307.212010

src/Data/DbStatementCache.php

@@ -0,0 +1,44 @@
+<?php
+// DbStatementCache.php
+// Created: 2023-07-21
+// Updated: 2023-07-21
+
+namespace Index\Data;
+
+/**
+ * Container to avoid having many prepared instances of the same query.
+ */
+class DbStatementCache {
+    private IDbConnection $dbConn;
+    private array $stmts = [];
+
+    public function __construct(IDbConnection $dbConn) {
+        $this->dbConn = $dbConn;
+    }
+
+    private static function hash(string $query): string {
+        return hash('xxh3', $query, true);
+    }
+
+    public function get(string $query): IDbStatement {
+        $hash = self::hash($query);
+
+        if(array_key_exists($hash, $this->stmts)) {
+            $stmt = $this->stmts[$hash];
+            $stmt->reset();
+            return $stmt;
+        }
+
+        return $this->stmts[$hash] = $this->dbConn->prepare($query);
+    }
+
+    public function remove(string $query): void {
+        unset($this->stmts[self::hash($query)]);
+    }
+
+    public function clear(): void {
+        foreach($this->stmts as $stmt)
+            $stmt->close();
+        $this->stmts = [];
+    }
+}

src/Data/DbTools.php

@@ -1,10 +1,11 @@
 <?php
 // DbTools.php
 // Created: 2021-05-02
-// Updated: 2023-07-11
+// Updated: 2023-07-21
 
 namespace Index\Data;
 
+use Countable;
 use InvalidArgumentException;
 use Index\Type;
 
@@ -114,4 +115,18 @@ final class DbTools {
             return DbType::STRING;
         return DbType::BLOB;
     }
+
+    /**
+     * Constructs a partial query for prepared statements of lists.
+     *
+     * @param Countable|array|int $count Amount of times to repeat the string in the $repeat parameter.
+     * @param string $repeat String to repeat.
+     * @param string $glue Glue character.
+     * @return string Glued string ready for being thrown into your prepared statement.
+     */
+    public static function prepareListString(Countable|array|int $count, string $repeat = '?', string $glue = ', '): string {
+        if(is_countable($count))
+            $count = count($count);
+        return implode($glue, array_fill(0, $count, $repeat));
+    }
 }