thzxx
d544501e1c
v0.2.6 质量加固: - 修复 AriaEngine 二级索引 SSTable 互相覆盖(命名空间隔离) - 修复 LSM 多版本读取顺序错误 + MergeIterator 取最新来源 - 重写 LZ4 压缩器(往返一致性 + 缓冲区溢出) - sstableCache LRU 上限 + 预加载兜底(BufferPool 配置生效) - 修复 React/Vue 集成 import type 运行时 bug + exports 子路径 - 新增 38 个测试(LZ4往返/Crypto/集成), 删除伪测试 v0.3.0 SQL 功能扩展: - 多语句 parseAll + 事务语句 BEGIN/COMMIT/ROLLBACK - INSERT INTO ... SELECT + UNION/UNION ALL + EXISTS 关联子查询 - CREATE/DROP INDEX 五引擎实现 + 别名 WHERE 修复 - benchmark 页面 + 36 个新测试 v0.3.1 表达式与性能: - CASE WHEN 表达式(SELECT 列/WHERE/聚合) - JOIN + 关联子查询逐行绑定 - WAL 批量组提交(写放大 O(N)→O(1)) - 修复 pending frozen 可见性 + flush 缓存竞争 v0.3.2 并发: - CASE WHEN 用于 WHERE/聚合 + JOIN 哈希连接 - 多标签页同步(multiTabSync + BroadcastChannel) - IndexedDB schema 持久化(reopen 后表结构恢复) - 修复 where-matcher 顶层 $not - 修复 CJS 产物 .js 被 ESM 解析(exports 空) — .cjs 后缀 + exports 修正 - 836 测试 / 44 套件 / 81.0% 覆盖率
697 lines
25 KiB
HTML
697 lines
25 KiB
HTML
<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>🧪 在线演示 — MetonaSqlark v0.3.2</title>
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<link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 32 32'><rect width='32' height='32' rx='8' fill='%236366f1'/><text x='16' y='22' text-anchor='middle' font-size='20' fill='white'>◈</text></svg>">
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<style>
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:root {
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--bg:#0a0a0f; --surface:#0d1117; --surface2:#161b22; --border:#30363d;
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--primary:#6366f1; --accent:#06b6d4; --accent2:#ec4899; --green:#22c55e;
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--text:#e2e8f0; --text2:#8b949e; --radius:12px;
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--gradient:linear-gradient(135deg,#6366f1,#06b6d4,#ec4899);
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}
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* { margin:0; padding:0; box-sizing:border-box; }
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body { font-family:'Inter',-apple-system,system-ui,sans-serif; background:var(--bg); color:var(--text); height:100vh; overflow:hidden; }
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header {
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height:56px; display:flex; align-items:center; justify-content:space-between; padding:0 24px;
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background:var(--surface); border-bottom:1px solid var(--border); z-index:10; position:relative;
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}
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.logo { font-weight:800; font-size:1.1rem; display:flex; align-items:center; gap:10px; }
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.logo .icon { width:28px; height:28px; border-radius:7px; background:var(--gradient); display:flex; align-items:center; justify-content:center; font-size:0.85rem; font-weight:900; color:#fff; }
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.logo span { background:var(--gradient); -webkit-background-clip:text; -webkit-text-fill-color:transparent; }
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nav { display:flex; gap:20px; }
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nav a { color:var(--text2); text-decoration:none; font-size:0.88rem; transition:.2s; }
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nav a:hover,.nav-active { color:var(--text); }
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.status { display:flex; align-items:center; gap:8px; font-size:0.82rem; color:var(--text2); }
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.status .dot { width:7px; height:7px; border-radius:50%; background:var(--green); animation:pulse 2s infinite; }
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@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.3} }
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.main { display:flex; height:calc(100vh - 56px); }
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.editor-panel { flex:1; display:flex; flex-direction:column; border-right:1px solid var(--border); min-width:400px; }
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.result-panel { flex:1; display:flex; flex-direction:column; min-width:400px; }
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.panel-header {
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padding:12px 20px; font-size:0.78rem; font-weight:600; text-transform:uppercase;
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letter-spacing:1px; color:var(--text2); border-bottom:1px solid var(--border);
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display:flex; align-items:center; justify-content:space-between;
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}
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.panel-header .badge {
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font-size:0.7rem; padding:3px 10px; border-radius:999px; background:var(--surface2);
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border:1px solid var(--border); text-transform:none; letter-spacing:0;
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}
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.editor-area { flex:1; display:flex; flex-direction:column; }
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#sql-input {
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flex:1; background:var(--surface); color:var(--text); border:none; padding:20px;
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font-family:'JetBrains Mono','Fira Code',monospace; font-size:0.9rem; line-height:1.8;
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resize:none; outline:none; caret-color:var(--primary);
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}
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#sql-input::placeholder { color:var(--text2); opacity:0.5; }
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.toolbar { display:flex; gap:8px; padding:12px 20px; border-top:1px solid var(--border); background:var(--surface2); flex-wrap:wrap; }
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.btn {
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display:inline-flex; align-items:center; gap:6px; padding:10px 20px; border-radius:8px;
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font-weight:600; font-size:0.85rem; cursor:pointer; border:none; transition:.25s; font-family:inherit;
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}
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.btn-run { background:var(--gradient); color:#fff; box-shadow:0 4px 15px rgba(99,102,241,0.35); }
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.btn-run:hover { transform:translateY(-1px); box-shadow:0 6px 25px rgba(99,102,241,0.5); }
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.btn-run:active { transform:scale(0.97); }
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.btn-clear { background:var(--surface2); color:var(--text2); border:1px solid var(--border); }
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.btn-clear:hover { color:var(--text); border-color:var(--text2); }
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.btn-preset { background:transparent; color:var(--accent); border:1px solid var(--accent); font-size:0.78rem; padding:6px 14px; }
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.btn-preset:hover { background:rgba(6,182,212,0.12); }
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.result-content { flex:1; overflow-y:auto; padding:20px; }
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.result-table { width:100%; border-collapse:collapse; font-size:0.85rem; }
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.result-table th { text-align:left; padding:10px 14px; background:var(--surface2); color:var(--accent); font-weight:600; border-bottom:2px solid var(--border); position:sticky; top:0; z-index:1; }
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.result-table td { padding:8px 14px; border-bottom:1px solid var(--border); color:var(--text2); max-width:250px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
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.result-table tr:hover td { background:rgba(99,102,241,0.04); }
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.empty-state { display:flex; flex-direction:column; align-items:center; justify-content:center; height:100%; color:var(--text2); gap:12px; }
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.empty-state .icon { font-size:3rem; opacity:0.3; }
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.error-box { background:rgba(239,68,68,0.1); border:1px solid rgba(239,68,68,0.3); border-radius:10px; padding:16px; color:#f87171; font-family:'JetBrains Mono',monospace; font-size:0.82rem; margin-bottom:16px; }
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.success-box { background:rgba(34,197,94,0.1); border:1px solid rgba(34,197,94,0.3); border-radius:10px; padding:12px 16px; color:#4ade80; font-size:0.85rem; margin-bottom:16px; }
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.sql-tag { display:inline-block; background:var(--surface2); border:1px solid var(--border); border-radius:6px; padding:4px 12px; font-family:'JetBrains Mono',monospace; font-size:0.75rem; color:var(--accent); margin-bottom:8px; }
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::-webkit-scrollbar { width:6px; height:6px; }
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::-webkit-scrollbar-track { background:transparent; }
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::-webkit-scrollbar-thumb { background:var(--border); border-radius:3px; }
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@media(max-width:900px){ .main { flex-direction:column; } .editor-panel,.result-panel { min-width:auto; } .editor-panel { height:50%; } }
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</style>
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</head>
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<body>
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<header>
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<div class="logo"><div class="icon">◈</div><span>MetonaSqlark</span></div>
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<nav>
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<a href="index.html">首页</a>
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<a href="docs.html">文档</a>
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<a href="demo.html" class="nav-active">演示</a>
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<a href="benchmark.html">基准</a>
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</nav>
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<div class="status"><span class="dot"></span> Memory 模式 — v0.3.2</div>
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</header>
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<div class="main">
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<div class="editor-panel">
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<div class="editor-area">
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<textarea id="sql-input" placeholder="输入 SQL 语句... SELECT * FROM users; INSERT INTO users VALUES ('4', 'Diana', 'diana@test.com', 28); SELECT u.name, o.amount FROM users u INNER JOIN orders o ON u.id = o.user_id;">-- 🚀 MetonaSqlark v0.3.2 在线演示
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-- 已预置 users / orders / products 表数据
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-- 新特性: ALTER TABLE · TRUNCATE TABLE · WAL同步 · MVCC · SQL注入防护
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-- 查看所有数据
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SELECT * FROM users;
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-- 条件查询 + 排序
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SELECT name, age FROM users WHERE age > 25 ORDER BY age DESC;
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-- JOIN 多表关联
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SELECT u.name, o.product, o.amount
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FROM users u INNER JOIN orders o ON u.id = o.user_id;
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-- 聚合统计
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SELECT COUNT(*) as total_users, AVG(age) as avg_age FROM users;</textarea>
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<div class="toolbar">
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<button class="btn btn-run" onclick="runQuery()">▶ 执行 (Ctrl+Enter)</button>
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<button class="btn btn-clear" onclick="clearResults()">🗑 清空</button>
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<span style="flex:1"></span>
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<button class="btn btn-preset" onclick="loadPreset('all')">📋 全数据</button>
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<button class="btn btn-preset" onclick="loadPreset('join')">🔗 JOIN</button>
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<button class="btn btn-preset" onclick="loadPreset('agg')">📊 聚合</button>
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<button class="btn btn-preset" onclick="loadPreset('ddl')">🏗 DDL</button>
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<button class="btn btn-preset" onclick="loadPreset('crud')">✏️ CRUD</button>
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<button class="btn btn-preset" onclick="loadPreset('subquery')">🔍 子查询</button>
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<button class="btn btn-preset" onclick="loadPreset('tx')">🔒 事务</button>
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<button class="btn btn-preset" onclick="loadPreset('scalar')">🎯 标量子查询</button>
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<button class="btn btn-preset" onclick="loadPreset('cascade')">🔗 级联</button>
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<button class="btn btn-preset" onclick="loadPreset('adv')">🧪 高级</button>
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<button class="btn btn-preset" onclick="loadPreset('alter')">🏗 ALTER</button>
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<button class="btn btn-preset" onclick="loadPreset('truncate')">🗑 TRUNCATE</button>
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<button class="btn btn-preset" onclick="loadPreset('casewhen')">🎯 CASE WHEN</button>
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<button class="btn btn-preset" onclick="loadPreset('union')">🔀 UNION</button>
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<button class="btn btn-preset" onclick="loadPreset('insertselect')">📥 INSERT SELECT</button>
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<button class="btn btn-preset" onclick="loadPreset('exists')">🔍 EXISTS</button>
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<button class="btn btn-preset" onclick="loadPreset('index')">🗂 索引</button>
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<button class="btn btn-preset" onclick="loadPreset('multistmt')">📜 多语句/事务</button>
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<button class="btn btn-preset" onclick="loadPreset('aria')" style="color:#ec4899;border-color:#ec4899;">🌲 Aria</button>
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</div>
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</div>
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</div>
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<div class="result-panel">
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<div class="panel-header">
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<span>📊 查询结果</span>
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<span class="badge" id="row-count">0 行</span>
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</div>
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<div class="result-content" id="result-area">
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<div class="empty-state">
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<div class="icon">⚡</div>
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<div>执行 SQL 查询以查看结果</div>
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<div style="font-size:0.8rem;opacity:0.6">Ctrl + Enter 快捷执行 · 支持多语句</div>
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</div>
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</div>
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</div>
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</div>
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<script src="../dist/metona-sqlark.js"></script>
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<script>
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// Resolve global: try both MetonaSqlark and MeSqlark
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const globalNs = window.MetonaSqlark || window.MeSqlark || {};
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const { MetonaSqlark, MeSqlark, create } = globalNs;
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const DBClass = MetonaSqlark || MeSqlark;
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let db = null;
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const resultArea = document.getElementById('result-area');
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const rowCount = document.getElementById('row-count');
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const sqlInput = document.getElementById('sql-input');
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// Init database
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async function initDB() {
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try {
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db = new DBClass({ name: 'demo', mode: 'memory' });
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await db.init();
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// Create tables
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await db.defineTable('users', {
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id: { type: 'string', primaryKey: true },
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name: { type: 'string', required: true },
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email: { type: 'string' },
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age: { type: 'number', default: 0 },
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});
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await db.defineTable('orders', {
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id: { type: 'string', primaryKey: true },
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user_id: { type: 'string' },
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product: { type: 'string' },
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amount: { type: 'number' },
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quantity: { type: 'number', default: 1 },
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});
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await db.defineTable('products', {
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id: { type: 'string', primaryKey: true },
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name: { type: 'string', required: true },
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price: { type: 'number', default: 0 },
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category: { type: 'string' },
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});
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// Seed data
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await db.table('users').insertMany([
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{ id: '1', name: 'Alice', email: 'alice@demo.com', age: 30 },
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{ id: '2', name: 'Bob', email: 'bob@demo.com', age: 25 },
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{ id: '3', name: 'Charlie', email: 'charlie@demo.com', age: 35 },
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{ id: '4', name: 'Diana', email: 'diana@demo.com', age: 28 },
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{ id: '5', name: 'Eve', email: 'eve@demo.com', age: 22 },
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]);
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await db.table('orders').insertMany([
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{ id: 'o1', user_id: '1', product: 'Laptop', amount: 1200, quantity: 1 },
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{ id: 'o2', user_id: '1', product: 'Mouse', amount: 50, quantity: 2 },
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{ id: 'o3', user_id: '2', product: 'Keyboard', amount: 150, quantity: 1 },
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{ id: 'o4', user_id: '3', product: 'Monitor', amount: 400, quantity: 1 },
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{ id: 'o5', user_id: '3', product: 'Cable', amount: 20, quantity: 3 },
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]);
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await db.table('products').insertMany([
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{ id: 'p1', name: 'Laptop', price: 1200, category: 'Electronics' },
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{ id: 'p2', name: 'Mouse', price: 50, category: 'Accessories' },
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{ id: 'p3', name: 'Keyboard', price: 150, category: 'Accessories' },
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]);
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} catch (e) {
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renderError('数据库初始化失败: ' + e.message);
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}
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}
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// Run SQL
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async function runQuery() {
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const sql = sqlInput.value.trim();
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if (!sql || !db) return;
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const statements = sql.split(';').map(s => s.trim()).filter(s => {
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// 过滤空语句和纯注释语句
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if (s.length === 0) return false;
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const nonComment = s.split('\n').filter(l => !l.trimStart().startsWith('--')).join('\n').trim();
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return nonComment.length > 0;
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});
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try {
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const allResults = [];
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for (const stmt of statements) {
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const result = await db.query(stmt);
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// 深拷贝查询结果，防止后续语句通过引用修改已保存的结果
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const resultCopy = Array.isArray(result) ? result.map(r => ({ ...r })) : result;
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allResults.push({ sql: stmt, result: resultCopy });
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}
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if (allResults.length === 1) {
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renderResult(allResults[0]);
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} else {
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renderAllResults(allResults);
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}
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} catch (e) {
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renderError(e.message || String(e));
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}
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}
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function renderResult({ sql, result }) {
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if (Array.isArray(result)) {
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renderTable(result);
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} else {
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renderSuccess(`✅ 执行成功 (影响 ${result ?? 0} 行)`);
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}
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}
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function renderAllResults(allResults) {
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let html = '';
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for (const { sql, result } of allResults) {
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html += `<div class="sql-tag">> ${escapeHTML(sql)}</div>`;
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if (Array.isArray(result)) {
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if (result.length === 0) {
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html += '<div class="success-box">✅ 查询返回 0 行</div>';
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} else {
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html += buildTableHTML(result);
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}
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} else {
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html += `<div class="success-box">✅ 执行成功 (影响 ${result ?? 0} 行)</div>`;
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}
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html += '<div style="height:12px"></div>';
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}
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resultArea.innerHTML = html;
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updateRowCount(allResults.reduce((sum, r) => sum + (Array.isArray(r.result) ? r.result.length : 0), 0));
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}
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function renderTable(rows) {
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if (!rows || rows.length === 0) {
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resultArea.innerHTML = '<div class="success-box">✅ 查询返回 0 行</div>';
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updateRowCount(0);
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return;
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}
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resultArea.innerHTML = buildTableHTML(rows);
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updateRowCount(rows.length);
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}
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function buildTableHTML(rows) {
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const columns = Object.keys(rows[0]);
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let html = '<table class="result-table"><thead><tr>';
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for (const col of columns) {
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html += `<th>${escapeHTML(col)}</th>`;
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}
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html += '</tr></thead><tbody>';
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for (const row of rows) {
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html += '<tr>';
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for (const col of columns) {
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const val = row[col];
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html += `<td>${formatCell(val)}</td>`;
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}
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html += '</tr>';
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}
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html += '</tbody></table>';
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return html;
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}
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function formatCell(val) {
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if (val === null) return '<span style="color:#64748b;font-style:italic">NULL</span>';
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if (val === undefined) return '<span style="color:#64748b">-</span>';
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if (typeof val === 'boolean') return `<span style="color:#fbbf24">${val}</span>`;
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if (typeof val === 'number') return `<span style="color:#fbbf24">${val}</span>`;
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return escapeHTML(String(val));
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}
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function renderError(msg) {
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resultArea.innerHTML = `<div class="error-box">❌ ${escapeHTML(msg)}</div>`;
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updateRowCount(0);
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}
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function renderSuccess(msg) {
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resultArea.innerHTML = `<div class="success-box">${msg}</div>`;
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}
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function clearResults() {
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resultArea.innerHTML = `<div class="empty-state"><div class="icon">⚡</div><div>结果已清空</div></div>`;
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updateRowCount(0);
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}
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function updateRowCount(n) { rowCount.textContent = `${n} 行`; }
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function escapeHTML(str) { return String(str).replace(/&/g,'&').replace(/</g,'<').replace(/>/g,'>').replace(/"/g,'"').replace(/'/g,'''); }
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// Presets
|
||
const presets = {
|
||
all: `-- 查看所有数据
|
||
SELECT * FROM users;
|
||
|
||
SELECT * FROM orders;
|
||
|
||
SELECT * FROM products;`,
|
||
join: `-- INNER JOIN：用户 + 订单
|
||
SELECT u.name, o.product, o.amount, o.quantity
|
||
FROM users u
|
||
INNER JOIN orders o ON u.id = o.user_id
|
||
ORDER BY o.amount DESC;
|
||
|
||
-- LEFT JOIN：包含没有订单的用户
|
||
SELECT u.name, o.product, o.amount
|
||
FROM users u
|
||
LEFT JOIN orders o ON u.id = o.user_id;`,
|
||
agg: `-- 聚合统计：每个用户的消费
|
||
SELECT u.name, COUNT(*) as orders, SUM(o.amount) as total_spent
|
||
FROM users u
|
||
INNER JOIN orders o ON u.id = o.user_id
|
||
GROUP BY u.name
|
||
ORDER BY total_spent DESC;
|
||
|
||
-- 全局聚合
|
||
SELECT COUNT(*) as total_users, AVG(age) as avg_age,
|
||
MIN(age) as min_age, MAX(age) as max_age
|
||
FROM users;
|
||
|
||
-- 分类统计
|
||
SELECT category, COUNT(*) as product_count, AVG(price) as avg_price
|
||
FROM products
|
||
GROUP BY category;`,
|
||
ddl: `-- 查看所有表
|
||
-- (使用 db.getTableNames() 替代)
|
||
|
||
-- 创建新表
|
||
CREATE TABLE tasks (
|
||
id STRING PRIMARY KEY,
|
||
title STRING NOT NULL,
|
||
done BOOLEAN DEFAULT false,
|
||
priority NUMBER DEFAULT 0
|
||
);
|
||
|
||
-- 插入数据
|
||
INSERT INTO tasks (id, title, done, priority) VALUES ('t1', 'Learn SQLark', false, 1);
|
||
INSERT INTO tasks VALUES ('t2', 'Write docs', true, 2);
|
||
|
||
-- 查询
|
||
SELECT * FROM tasks ORDER BY priority DESC;
|
||
|
||
-- 删除表
|
||
DROP TABLE tasks;`,
|
||
crud: `-- 增
|
||
INSERT INTO users VALUES ('9', 'Frank', 'frank@demo.com', 40);
|
||
|
||
-- 查
|
||
SELECT * FROM users WHERE name = 'Frank';
|
||
|
||
-- 改
|
||
UPDATE users SET age = 41, email = 'frank2@demo.com' WHERE id = '9';
|
||
|
||
-- 查（确认）
|
||
SELECT * FROM users WHERE id = '9';
|
||
|
||
-- 删
|
||
DELETE FROM users WHERE id = '9';
|
||
|
||
-- 确认
|
||
SELECT COUNT(*) as user_count FROM users;`,
|
||
subquery: `-- IN 子查询：有订单的用户
|
||
SELECT name, email FROM users
|
||
WHERE id IN (SELECT user_id FROM orders);
|
||
|
||
-- NOT IN 子查询：没有订单的用户
|
||
SELECT name, email FROM users
|
||
WHERE id NOT IN (SELECT user_id FROM orders);
|
||
|
||
-- 标量子查询：消费最高的用户
|
||
SELECT name, age FROM users
|
||
WHERE id IN (
|
||
SELECT user_id FROM orders
|
||
WHERE amount = (SELECT MAX(amount) FROM orders)
|
||
);`,
|
||
tx: `-- 事务演示：使用 db.transaction() API
|
||
-- 查询用户 Alice
|
||
SELECT * FROM users WHERE id = '1';
|
||
|
||
-- 为 Alice 插入新订单
|
||
INSERT INTO orders VALUES ('o99', '1', 'Headphones', 199, 1);
|
||
|
||
-- 查看 Alice 的订单汇总
|
||
SELECT u.name, COUNT(*) as order_count, SUM(o.amount) as total
|
||
FROM users u INNER JOIN orders o ON u.id = o.user_id
|
||
WHERE u.id = '1'
|
||
GROUP BY u.name;
|
||
|
||
-- 生产环境用 db.transaction() 包裹保证原子性`,
|
||
scalar: `-- 聚合无 GROUP BY 返回单行
|
||
SELECT COUNT(*) as total_users, AVG(age) as avg_age FROM users;
|
||
|
||
-- 年龄大于平均值的用户
|
||
SELECT name, age FROM users
|
||
WHERE age > (SELECT AVG(age) FROM users);
|
||
|
||
-- 消费超过平均值的用户
|
||
SELECT u.name, SUM(o.amount) as spent
|
||
FROM users u INNER JOIN orders o ON u.id = o.user_id
|
||
GROUP BY u.name
|
||
HAVING SUM(o.amount) > (SELECT AVG(amount) FROM orders);`,
|
||
cascade: `-- 外键级联：重建 orders 表带 CASCADE
|
||
DROP TABLE IF EXISTS orders;
|
||
|
||
CREATE TABLE orders (
|
||
id STRING PRIMARY KEY,
|
||
user_id STRING REFERENCES users(id) ON DELETE CASCADE,
|
||
product STRING,
|
||
amount NUMBER,
|
||
quantity NUMBER DEFAULT 1
|
||
);
|
||
|
||
-- 重新插入数据
|
||
INSERT INTO orders VALUES ('o1', '1', 'Laptop', 1200, 1);
|
||
INSERT INTO orders VALUES ('o2', '1', 'Mouse', 50, 2);
|
||
INSERT INTO orders VALUES ('o3', '2', 'Keyboard', 150, 1);
|
||
|
||
-- 查看关联数据
|
||
SELECT u.name, o.product, o.amount
|
||
FROM users u INNER JOIN orders o ON u.id = o.user_id;
|
||
|
||
-- 删除 Alice (id=1) 订单自动级联删除
|
||
DELETE FROM users WHERE id = '1';
|
||
|
||
-- 确认级联结果
|
||
SELECT u.name, o.product, o.amount
|
||
FROM users u LEFT JOIN orders o ON u.id = o.user_id;`,
|
||
adv: `-- BETWEEN 范围查询
|
||
SELECT * FROM users
|
||
WHERE age BETWEEN 20 AND 30 AND name != 'Bob'
|
||
ORDER BY age DESC;
|
||
|
||
-- DISTINCT 去重
|
||
SELECT DISTINCT age FROM users ORDER BY age;
|
||
|
||
-- 多表 JOIN + 过滤 + 排序 + 分页
|
||
SELECT u.name, o.product, o.amount
|
||
FROM users u
|
||
INNER JOIN orders o ON u.id = o.user_id
|
||
WHERE o.amount >= 50
|
||
ORDER BY o.amount DESC
|
||
LIMIT 5 OFFSET 0;
|
||
|
||
-- NOT LIKE 模糊排除
|
||
SELECT * FROM users
|
||
WHERE name NOT LIKE 'A%' AND age > 20;`,
|
||
alter: `-- 🏗 ALTER TABLE 动态修改表结构 (v0.2.5)
|
||
|
||
-- 添加新列
|
||
ALTER TABLE users ADD COLUMN phone STRING;
|
||
|
||
-- 插入数据（含新列）
|
||
INSERT INTO users (id, name, age, phone) VALUES ('6', 'Frank', 33, '123-4567');
|
||
|
||
-- 查询确认
|
||
SELECT * FROM users WHERE id = '6';
|
||
|
||
-- 删除列
|
||
ALTER TABLE users DROP COLUMN phone;
|
||
|
||
-- 查询确认（phone 列已删除）
|
||
SELECT * FROM users WHERE id = '6';`,
|
||
truncate: `-- 🗑 TRUNCATE TABLE 快速清空 (v0.2.5)
|
||
|
||
-- 创建临时表并插入数据
|
||
CREATE TABLE IF NOT EXISTS temp_logs (
|
||
id STRING PRIMARY KEY,
|
||
message STRING NOT NULL
|
||
);
|
||
INSERT INTO temp_logs VALUES ('1', 'log A');
|
||
INSERT INTO temp_logs VALUES ('2', 'log B');
|
||
INSERT INTO temp_logs VALUES ('3', 'log C');
|
||
|
||
-- 确认数据
|
||
SELECT COUNT(*) as total FROM temp_logs;
|
||
|
||
-- TRUNCATE 快速清空
|
||
TRUNCATE TABLE temp_logs;
|
||
|
||
-- 确认清空
|
||
SELECT COUNT(*) as total FROM temp_logs;
|
||
|
||
-- 清理
|
||
DROP TABLE temp_logs;`,
|
||
aria: `-- 🌲 AriaEngine 演示 (v0.2.5 → v0.3.2)
|
||
-- AriaEngine: LSM-Tree 自研存储引擎
|
||
-- 支持 LSM-Tree · WAL CRC同步 · MVCC版本链 · BloomFilter · 二级索引 · AES-GCM · 836测试
|
||
|
||
-- 基础 CRUD 完全兼容
|
||
CREATE TABLE IF NOT EXISTS tasks (
|
||
id STRING PRIMARY KEY,
|
||
title STRING NOT NULL,
|
||
done BOOLEAN DEFAULT false
|
||
);
|
||
|
||
-- 插入数据
|
||
INSERT INTO tasks VALUES ('t1', 'Implement AriaEngine', false);
|
||
INSERT INTO tasks VALUES ('t2', 'Write tests', false);
|
||
INSERT INTO tasks VALUES ('t3', 'Update docs', true);
|
||
|
||
-- 查询
|
||
SELECT * FROM tasks ORDER BY title;
|
||
|
||
-- 聚合统计
|
||
SELECT done, COUNT(*) as cnt FROM tasks GROUP BY done;
|
||
|
||
-- CASE WHEN 表达式
|
||
SELECT title,
|
||
CASE WHEN done THEN '✅ done' ELSE '⏳ pending' END AS status
|
||
FROM tasks;
|
||
|
||
-- EXISTS 关联子查询
|
||
SELECT u.name FROM users u
|
||
WHERE EXISTS (SELECT 1 FROM orders o WHERE o.user_id = u.id);
|
||
|
||
-- AriaEngine 特性:
|
||
-- • LSM-Tree: MemTable (红黑树) → SSTable 多级索引
|
||
-- • WAL: Write-Ahead Log 保证崩溃恢复 + 批量组提交
|
||
-- • MVCC: 版本链 + 快照隔离
|
||
-- • Buffer Pool: SSTable LRU 缓存 (256页 ~ 1MB) ✅ 已生效
|
||
-- • Bloom Filter: FNV-1a + Murmur 双哈希
|
||
-- • 二级索引: 每列独立 LSM + 动态 CREATE INDEX
|
||
|
||
-- 生产环境: mode: 'aria' 激活自研引擎
|
||
-- const db = await MetonaSqlark.create({
|
||
-- name: 'my-app', mode: 'aria'
|
||
-- });`,
|
||
casewhen: `-- 🎯 CASE WHEN 条件表达式 (v0.3.1 / v0.3.2)
|
||
|
||
-- SELECT 列：多 WHEN + ELSE
|
||
SELECT name, age,
|
||
CASE WHEN age >= 30 THEN 'senior'
|
||
WHEN age >= 25 THEN 'mid'
|
||
ELSE 'junior' END AS age_group
|
||
FROM users ORDER BY age;
|
||
|
||
-- WHERE 条件中的 CASE WHEN
|
||
SELECT name FROM users
|
||
WHERE CASE WHEN age >= 25 THEN 'adult' ELSE 'young' END = 'adult';
|
||
|
||
-- 聚合中的 CASE WHEN
|
||
SELECT
|
||
SUM(CASE WHEN age >= 30 THEN 1 ELSE 0 END) AS seniors,
|
||
SUM(CASE WHEN age < 30 THEN 1 ELSE 0 END) AS juniors,
|
||
AVG(CASE WHEN age >= 25 THEN age END) AS avg_adult_age
|
||
FROM users;`,
|
||
union: `-- 🔀 UNION / UNION ALL (v0.3.0)
|
||
|
||
-- UNION 去重合并两表数据
|
||
SELECT name FROM users WHERE age >= 30
|
||
UNION
|
||
SELECT name FROM users WHERE age < 30;
|
||
|
||
-- UNION 对重复行去重（同查询两次 → 结果去重）
|
||
SELECT category FROM products
|
||
UNION
|
||
SELECT category FROM products;
|
||
|
||
-- UNION ALL 保留重复
|
||
SELECT category FROM products WHERE price >= 100
|
||
UNION ALL
|
||
SELECT category FROM products WHERE price >= 50;`,
|
||
insertselect: `-- 📥 INSERT INTO ... SELECT (v0.3.0)
|
||
|
||
-- 建备份表并复制全量数据
|
||
DROP TABLE IF EXISTS users_backup;
|
||
CREATE TABLE users_backup (
|
||
id STRING PRIMARY KEY, name STRING, email STRING, age NUMBER
|
||
);
|
||
INSERT INTO users_backup SELECT * FROM users;
|
||
|
||
-- 确认复制
|
||
SELECT COUNT(*) as backed_up FROM users_backup;
|
||
|
||
-- INSERT SELECT 带 WHERE 过滤
|
||
DROP TABLE IF EXISTS big_spenders;
|
||
CREATE TABLE big_spenders (
|
||
id STRING PRIMARY KEY, product STRING, amount NUMBER
|
||
);
|
||
INSERT INTO big_spenders (id, product, amount)
|
||
SELECT o.id, o.product, o.amount FROM orders o WHERE o.amount >= 150;
|
||
|
||
-- 确认过滤结果
|
||
SELECT * FROM big_spenders;`,
|
||
exists: `-- 🔍 EXISTS 关联子查询 (v0.3.0 / v0.3.1)
|
||
|
||
-- 有订单的用户（关联子查询）
|
||
SELECT u.name FROM users u
|
||
WHERE EXISTS (SELECT 1 FROM orders o WHERE o.user_id = u.id);
|
||
|
||
-- 无订单的用户（NOT EXISTS）
|
||
SELECT u.name FROM users u
|
||
WHERE NOT EXISTS (SELECT 1 FROM orders o WHERE o.user_id = u.id);
|
||
|
||
-- EXISTS + JOIN 组合
|
||
SELECT u.name, o.product, o.amount FROM users u
|
||
JOIN orders o ON u.id = o.user_id
|
||
WHERE EXISTS (SELECT 1 FROM orders o2 WHERE o2.user_id = u.id AND o2.amount > 100);`,
|
||
index: `-- 🗂 动态索引 CREATE / DROP INDEX (v0.3.0)
|
||
|
||
-- 为 orders.user_id 创建索引
|
||
CREATE INDEX idx_orders_user ON orders (user_id);
|
||
|
||
-- 索引查找（走二级索引）
|
||
SELECT u.name, o.product, o.amount
|
||
FROM orders o JOIN users u ON u.id = o.user_id
|
||
WHERE o.user_id = '1';
|
||
|
||
-- 删除索引
|
||
DROP INDEX idx_orders_user ON orders (user_id);
|
||
|
||
-- 删除后回退全表扫描（结果不变）
|
||
SELECT * FROM orders WHERE user_id = '3';`,
|
||
multistmt: `-- 📜 多语句 + 事务语句 (v0.3.0)
|
||
|
||
-- 分号分隔的多语句一次执行
|
||
DROP TABLE IF EXISTS audit;
|
||
CREATE TABLE audit (id STRING PRIMARY KEY, msg STRING);
|
||
INSERT INTO audit VALUES ('a1', 'first');
|
||
INSERT INTO audit VALUES ('a2', 'second');
|
||
SELECT * FROM audit ORDER BY id;
|
||
|
||
-- 事务语句：BEGIN → ROLLBACK（a3 不会生效）
|
||
BEGIN;
|
||
INSERT INTO audit VALUES ('a3', 'will be rolled back');
|
||
ROLLBACK;
|
||
SELECT * FROM audit ORDER BY id;
|
||
|
||
-- 事务语句：BEGIN → COMMIT（a4 生效）
|
||
BEGIN;
|
||
INSERT INTO audit VALUES ('a4', 'will be committed');
|
||
COMMIT;
|
||
SELECT COUNT(*) as total FROM audit;`,
|
||
};
|
||
|
||
function loadPreset(name) {
|
||
if (presets[name]) {
|
||
sqlInput.value = presets[name];
|
||
runQuery();
|
||
}
|
||
}
|
||
|
||
// Keyboard shortcut
|
||
document.addEventListener('keydown', e => {
|
||
if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') {
|
||
e.preventDefault();
|
||
runQuery();
|
||
}
|
||
});
|
||
|
||
// Boot
|
||
initDB().then(() => {
|
||
console.log('✅ MetonaSqlark v0.3.2 demo ready');
|
||
setTimeout(runQuery, 300);
|
||
}).catch(err => {
|
||
renderError('初始化失败: ' + err.message);
|
||
});
|
||
</script>
|
||
</body>
|
||
</html>
|