初始化

2026-08-08 18:28:49 +08:00
parent 9bef4420e0
commit f082037a6e
854 changed files with 217171 additions and 11 deletions
@@ -0,0 +1,40 @@
+<?php
+namespace core\db;
+
+use PDO;
+use PDOException;
+
+/**
+ * 数据库操作类
+ */
+class Db
+{
+    private static $pdo = null;
+
+    public static function pdo()
+    {
+        if (self::$pdo !== null) {
+            return self::$pdo;
+        }
+
+        try {
+            $dsn    = sprintf('mysql:host=%s;dbname=%s;charset=utf8mb4', DB_HOST, DB_NAME);
+            $option = array(
+                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+                // 强制开启查询缓冲：避免「2014 Cannot execute queries while other
+                // unbuffered queries are active」。该连接在多处被复用（单例），
+                // 若不缓冲，前一条语句的结果集未取完就会阻塞后续查询。
+                PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => true,
+            );
+
+            $pdo = new PDO($dsn, DB_USER, DB_PASS, $option);
+            // 部分环境在构造选项里设置不生效，再显式 setAttribute 兜底
+            $pdo->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true);
+            return self::$pdo = $pdo;
+        } catch (PDOException $e) {
+            error_log('DB connection error: ' . $e->getMessage());
+            exit('数据库连接失败，请联系管理员');
+        }
+    }
+}
@@ -0,0 +1,56 @@
+<?php
+namespace core\db;
+
+/**
+ * SQL 辅助类
+ */
+class Sql
+{
+    // 构建 INSERT 语句
+    public static function insert($table, $data)
+    {
+        $fields = implode(', ', array_keys($data));
+        $placeholders = ':' . implode(', :', array_keys($data));
+        return 'INSERT INTO ' . $table . ' (' . $fields . ') VALUES (' . $placeholders . ')';
+    }
+
+    // 构建 UPDATE 语句
+    public static function update($table, $data, $where = '')
+    {
+        $set = array();
+        foreach ($data as $key => $value) {
+            $set[] = $key . ' = :' . $key;
+        }
+        $sql = 'UPDATE ' . $table . ' SET ' . implode(', ', $set);
+        if ($where) {
+            $sql .= ' WHERE ' . $where;
+        }
+        return $sql;
+    }
+
+    // 构建 SELECT 语句
+    public static function select($table, $fields = '*', $where = '', $order = '', $limit = '')
+    {
+        $sql = 'SELECT ' . $fields . ' FROM ' . $table;
+        if ($where) {
+            $sql .= ' WHERE ' . $where;
+        }
+        if ($order) {
+            $sql .= ' ORDER BY ' . $order;
+        }
+        if ($limit) {
+            $sql .= ' LIMIT ' . $limit;
+        }
+        return $sql;
+    }
+
+    // 构建 DELETE 语句
+    public static function delete($table, $where = '')
+    {
+        $sql = 'DELETE FROM ' . $table;
+        if ($where) {
+            $sql .= ' WHERE ' . $where;
+        }
+        return $sql;
+    }
+}