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<!doctype html>
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<title>
SQL 转 ER 图在线工具 · Chen 模型生成器 | SQL / DBML to ER Diagram — sql2er
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<meta
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content="免费在线 SQL 转 ER 图工具：把 CREATE TABLE 建表语句或 DBML 一键生成 Chen 模型实体-关系图。纯前端运行，数据不出浏览器，无需登录、不埋点；支持 PostgreSQL / MySQL / SQLite 语法，节点可拖动、双击改名，可导出 SVG / PNG。Free online tool to convert SQL & DBML into Chen-model ER diagrams, 100% client-side and open source."
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content="把 SQL CREATE TABLE 或 DBML 一键转成 Chen 模型 ER 图，纯前端、开源、免登录。Turn SQL / DBML into Chen-model ER diagrams — free, open source, 100% client-side."
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"name": "打开 sql2er / Open sql2er",
"text": "在浏览器中访问 https://ystemsrx.github.io/sql_to_ER/ 。无需注册或登录。Open https://ystemsrx.github.io/sql_to_ER/ in any modern browser. No sign-up required.",
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"headline": "把 SQL / DBML 转成 Chen 模型 ER 图：sql2er 使用与原理 / Convert SQL & DBML to Chen-model ER Diagrams with sql2er",
"description": "sql2er 是一个免费、开源、纯前端的在线工具，把 SQL CREATE TABLE 语句或 DBML 转换为 Chen 模型的实体-关系图，支持力导向布局、节点编辑与 SVG / PNG 导出。",
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<!-- ── Favicon (inline SVG, network/diagram icon) ── -->
<link
rel="icon"
type="image/svg+xml"
href="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23D97757' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='16' y='16' width='6' height='6' rx='1'/%3E%3Crect x='2' y='16' width='6' height='6' rx='1'/%3E%3Crect x='9' y='2' width='6' height='6' rx='1'/%3E%3Cpath d='M5 16v-3a1 1 0 0 1 1-1h12a1 1 0 0 1 1 1v3'/%3E%3Cpath d='M12 12V8'/%3E%3C/svg%3E"
/>
<!-- 先字体，后 base -->
<link rel="stylesheet" href="./assets/fonts/fonts.css" />
<link rel="stylesheet" href="./assets/base.css" />
<style>
/* ─── 主题变量 ───────────────── */
[data-theme="light"] {
--bg: var(--color-bg-base);
--bg-raised: var(--color-bg-raised);
--bg-overlay: var(--color-bg-overlay);
--ink: var(--color-text-primary);
--ink-2: var(--color-text-secondary);
--ink-3: var(--color-text-muted);
--hair: var(--color-border-subtle);
--rule: var(--color-border-default);
--invert-bg: #141413;
--invert-ink: #faf9f5;
--invert-ink-2: #a9a69c;
--invert-hair: #2b2a26;
}
[data-theme="dark"] {
--bg: #1a1916;
--bg-raised: #222119;
--bg-overlay: #2a2822;
--ink: #eae7dc;
--ink-2: #a9a69c;
--ink-3: #6b6860;
--hair: #2e2d27;
--rule: #3a3830;
--invert-bg: #faf9f5;
--invert-ink: #141413;
--invert-ink-2: #4f4c45;
--invert-hair: #d8d5cc;
}
html,
body {
background: var(--bg);
color: var(--ink);
font-family: var(--font-heading-cn);
transition:
background var(--duration-slow) var(--ease-default),
color var(--duration-slow) var(--ease-default);
}
::selection {
background: var(--color-accent-orange);
color: #fff;
}
/* 单一暖色晕染，克制 */
body::before {
content: "";
position: fixed;
inset: 0;
z-index: -1;
pointer-events: none;
background: radial-gradient(
ellipse 60% 50% at 15% 0%,
rgba(217, 119, 87, 0.09) 0%,
transparent 55%
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}
[data-theme="dark"] body::before {
background: radial-gradient(
ellipse 60% 50% at 15% 0%,
rgba(217, 119, 87, 0.12) 0%,
transparent 55%
);
}
/* 排版 */
.display {
font-family: var(--font-display-cn);
font-weight: var(--weight-regular);
line-height: var(--leading-cn-tight);
letter-spacing: -0.01em;
}
.display em {
font-style: italic;
color: var(--color-accent-warm);
}
.eyebrow {
font-family: var(--font-heading);
font-size: var(--text-xs);
font-weight: var(--weight-medium);
letter-spacing: 0.14em;
text-transform: uppercase;
color: var(--ink-2);
display: inline-flex;
align-items: center;
gap: 10px;
}
.eyebrow::before {
content: "";
width: 24px;
height: 1px;
background: var(--rule);
}
/* ─── 导航 ───────────── */
.nav {
position: sticky;
top: 0;
z-index: 50;
backdrop-filter: saturate(180%) blur(14px);
-webkit-backdrop-filter: saturate(180%) blur(14px);
background: color-mix(in srgb, var(--bg) 80%, transparent);
border-bottom: 1px solid transparent;
transition: border-color var(--duration-normal) var(--ease-default);
}
.nav.is-scrolled {
border-bottom-color: var(--hair);
}
.nav-row {
max-width: var(--max-width-full);
margin: 0 auto;
padding: 16px clamp(var(--space-6), 5vw, var(--space-16));
display: grid;
grid-template-columns: auto 1fr auto;
align-items: center;
gap: 24px;
}
.brand {
display: inline-flex;
align-items: center;
gap: 10px;
color: var(--ink);
}
.brand-mark {
width: 32px;
height: 32px;
border-radius: 50%;
background: var(--color-accent-orange);
display: grid;
place-items: center;
color: #fff;
box-shadow: 0 4px 10px rgba(217, 119, 87, 0.28);
transition: transform var(--duration-normal) var(--ease-bounce);
}
.brand:hover .brand-mark {
transform: rotate(-8deg) scale(1.05);
}
.brand-mark svg {
width: 16px;
height: 16px;
}
.brand-name {
font-family: var(--font-display);
font-style: italic;
font-size: 1.15rem;
letter-spacing: -0.01em;
white-space: nowrap;
}
.nav-links {
justify-self: center;
display: flex;
gap: 4px;
}
.nav-links a {
font-family: var(--font-heading);
font-size: 0.88rem;
font-weight: 500;
color: var(--ink-2);
padding: 8px 14px;
border-radius: 999px;
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color var(--duration-fast) var(--ease-default),
background var(--duration-fast) var(--ease-default);
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color: var(--ink);
background: var(--bg-raised);
}
.nav-actions {
display: flex;
gap: 8px;
align-items: center;
}
.icon-btn {
width: 36px;
height: 36px;
border-radius: 999px;
border: 1px solid var(--rule);
color: var(--ink-2);
cursor: pointer;
display: grid;
place-items: center;
background: transparent;
transition: all var(--duration-fast) var(--ease-default);
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color: var(--ink);
border-color: var(--color-accent-orange);
background: var(--bg-raised);
}
.icon-btn svg {
width: 15px;
height: 15px;
}
@media (max-width: 820px) {
.nav-links {
display: none;
}
}
/* ─── 按钮 ───────────── */
.btn {
display: inline-flex;
align-items: center;
gap: 10px;
padding: 13px 22px;
border-radius: 999px;
font-family: var(--font-heading);
font-weight: 500;
font-size: 0.95rem;
letter-spacing: 0.01em;
border: 1px solid transparent;
cursor: pointer;
transition:
transform var(--duration-fast) var(--ease-default),
background var(--duration-normal) var(--ease-default),
color var(--duration-normal) var(--ease-default),
box-shadow var(--duration-normal) var(--ease-default);
}
.btn svg {
width: 16px;
height: 16px;
}
.btn-primary {
background: var(--color-accent-orange);
color: #fff;
box-shadow: 0 6px 18px rgba(217, 119, 87, 0.28);
}
.btn-primary:hover {
transform: translateY(-2px);
background: var(--color-accent-warm);
box-shadow: 0 10px 26px rgba(201, 100, 66, 0.4);
}
.btn-ghost {
background: transparent;
color: var(--ink);
border-color: var(--rule);
}
.btn-ghost:hover {
transform: translateY(-2px);
border-color: var(--ink);
background: var(--bg-raised);
}
/* ─── Hero ───────────── */
.hero {
padding-block: clamp(32px, 4vw, 56px) clamp(40px, 5vw, 72px);
}
.hero-grid {
max-width: var(--max-width-full);
margin: 0 auto;
padding-inline: clamp(var(--space-6), 5vw, var(--space-16));
display: grid;
grid-template-columns: 1fr 1fr;
gap: clamp(32px, 5vw, 64px);
align-items: center;
}
@media (max-width: 960px) {
.hero-grid {
grid-template-columns: 1fr;
}
}
.hero-title {
font-size: clamp(2.2rem, 5.4vw, 4.2rem);
margin-top: var(--space-6);
margin-bottom: var(--space-5);
}
.hero-title .line-2 {
display: block;
margin-left: clamp(0px, 3vw, 36px);
}
.hero-lead {
font-family: var(--font-body-cn);
font-size: clamp(1.02rem, 1.4vw, 1.18rem);
color: var(--ink-2);
line-height: var(--leading-cn-loose);
max-width: 28em;
margin-bottom: var(--space-8);
}
.hero-cta {
display: flex;
flex-wrap: wrap;
gap: 12px;
}
/* ─── Hero 右侧：真实 ER 图 ─── */
.er-stage {
position: relative;
aspect-ratio: 5 / 4;
background: var(--bg-raised);
border: 1px solid var(--hair);
border-radius: var(--radius-xl);
overflow: hidden;
box-shadow: var(--shadow-elevated);
}
.er-chip {
position: absolute;
top: 14px;
left: 14px;
z-index: 2;
pointer-events: none; /* 不拦截画布交互 */
font-family: var(--font-heading);
font-size: 0.72rem;
font-weight: 500;
letter-spacing: 0.08em;
color: var(--ink-2);
display: inline-flex;
align-items: center;
gap: 8px;
padding: 6px 12px;
border-radius: 999px;
background: color-mix(in srgb, var(--bg-overlay) 85%, transparent);
border: 1px solid var(--hair);
backdrop-filter: blur(8px);
}
.er-chip::before {
content: "";
width: 6px;
height: 6px;
border-radius: 50%;
background: var(--color-accent-orange);
box-shadow: 0 0 0 3px rgba(217, 119, 87, 0.22);
animation: blink 1.8s ease-in-out infinite;
}
@keyframes blink {
0%,
100% {
opacity: 1;
transform: scale(1);
}
50% {
opacity: 0.4;
transform: scale(0.85);
}
}
.er-reset {
position: absolute;
top: 14px;
right: 14px;
z-index: 2;
width: 34px;
height: 34px;
border-radius: 50%;
background: color-mix(in srgb, var(--bg-overlay) 85%, transparent);
border: 1px solid var(--hair);
color: var(--ink-2);
cursor: pointer;
display: grid;
place-items: center;
backdrop-filter: blur(8px);
transition:
color var(--duration-fast) var(--ease-default),
border-color var(--duration-fast) var(--ease-default),
transform 500ms var(--ease-default);
}
.er-reset:hover {
color: var(--color-accent-warm);
border-color: var(--color-accent-orange);
transform: rotate(-180deg);
}
.er-reset:active {
transform: rotate(-360deg);
}
.er-reset > svg {
width: 13px;
height: 13px;
display: block;
fill: currentColor;
}
#hero-er {
position: absolute;
inset: 0;
width: 100%;
height: 100%;
opacity: 1;
transition: opacity 260ms var(--ease-default);
}
#hero-er canvas {
display: block;
}
/* 构建期间：瞬间隐藏，避免用户看到未 fit 的大图一闪；
移除该类后走 transition 平滑淡入 */
.er-stage.is-building #hero-er {
opacity: 0;
transition: none;
}
.er-fallback {
position: absolute;
inset: 0;
display: grid;
place-items: center;
color: var(--ink-3);
font-family: var(--font-heading);
font-size: 0.85rem;
opacity: 0;
pointer-events: none; /* 关键：opacity:0 不会自动禁用 pointer-events，必须显式加 */
transition: opacity var(--duration-normal) var(--ease-default);
}
.er-stage.is-failed .er-fallback {
opacity: 1;
pointer-events: auto;
}
/* ─── 区块 ───────────── */
section {
padding-block: clamp(40px, 5vw, 72px) clamp(48px, 6vw, 88px);
position: relative;
}
.container {
max-width: var(--max-width-layout);
margin: 0 auto;
padding-inline: clamp(var(--space-6), 5vw, var(--space-16));
}
.section-head {
margin-bottom: clamp(28px, 3.5vw, 48px);
max-width: 36em;
}
.section-head h2 {
font-family: var(--font-display-cn);
font-weight: var(--weight-regular);
font-size: clamp(1.9rem, 4vw, 2.8rem);
line-height: var(--leading-cn-tight);
letter-spacing: -0.01em;
margin-top: var(--space-3);
margin-bottom: var(--space-4);
}
.section-head h2 em {
font-style: italic;
color: var(--color-accent-warm);
}
.section-head p {
font-family: var(--font-body-cn);
color: var(--ink-2);
font-size: 1.05rem;
line-height: var(--leading-cn-loose);
max-width: 28em;
}
/* ─── 特性（四条，编辑式）─── */
.features {
display: grid;
grid-template-columns: repeat(2, 1fr);
column-gap: clamp(32px, 4vw, 64px);
row-gap: clamp(28px, 3.5vw, 48px);
}
@media (max-width: 720px) {
.features {
grid-template-columns: 1fr;
}
}
.feat {
display: grid;
grid-template-columns: auto 1fr;
gap: 20px;
padding-top: var(--space-5);
border-top: 1px solid var(--hair);
}
.feat-num {
font-family: var(--font-display);
font-style: italic;
font-size: 1.2rem;
color: var(--color-accent-warm);
line-height: 1;
padding-top: 4px;
}
.feat h3 {
font-family: var(--font-heading-cn);
font-weight: var(--weight-semibold);
font-size: 1.1rem;
margin-bottom: 8px;
letter-spacing: -0.005em;
}
.feat p {
font-family: var(--font-body-cn);
color: var(--ink-2);
font-size: 0.98rem;
line-height: var(--leading-cn-loose);
}
/* ─── Demo ─── */
.demo-card {
background: var(--bg-raised);
border: 1px solid var(--hair);
border-radius: var(--radius-xl);
overflow: hidden;
}
.demo-bar {
display: flex;
align-items: center;
gap: 6px;
padding: 12px 16px;
background: var(--bg-overlay);
border-bottom: 1px solid var(--hair);
}
.tab {
padding: 7px 14px;
border-radius: 999px;
font-family: var(--font-heading);
font-size: 0.85rem;
font-weight: 500;
color: var(--ink-2);
cursor: pointer;
background: transparent;
border: 1px solid transparent;
transition: all var(--duration-fast) var(--ease-default);
display: inline-flex;
align-items: center;
gap: 8px;
}
.tab:hover {
color: var(--ink);
}
.tab.is-active {
color: var(--color-accent-warm);
background: color-mix(
in srgb,
var(--color-accent-orange) 10%,
transparent
);
border-color: color-mix(
in srgb,
var(--color-accent-orange) 30%,
transparent
);
}
.demo-actions {
margin-left: auto;
display: flex;
gap: 8px;
}
.mini-btn {
display: inline-flex;
align-items: center;
gap: 8px;
padding: 6px 12px;
border-radius: 999px;
font-family: var(--font-heading);
font-size: 0.8rem;
font-weight: 500;
color: var(--ink-2);
background: transparent;
border: 1px solid var(--rule);
cursor: pointer;
transition: all var(--duration-fast) var(--ease-default);
}
.mini-btn:hover {
color: var(--color-accent-warm);
border-color: var(--color-accent-orange);
}
.mini-btn svg {
width: 13px;
height: 13px;
}
.code-panel {
display: none;
}
.code-panel.is-active {
display: block;
}
.code-panel pre {
margin: 0 !important;
padding: clamp(20px, 2.5vw, 32px) clamp(20px, 3vw, 36px) !important;
background: transparent !important;
font-family: var(--font-mono) !important;
font-size: 0.9rem !important;
line-height: 1.7 !important;
max-height: 360px;
overflow: auto;
}
.code-panel code {
font-family: var(--font-mono) !important;
}
.demo-foot {
padding: 12px 20px;
border-top: 1px solid var(--hair);
background: color-mix(
in srgb,
var(--color-accent-orange) 5%,
transparent
);
font-family: var(--font-body-cn);
font-size: 0.9rem;
color: var(--ink-2);
display: flex;
align-items: center;
gap: 10px;
}
/* Prism 覆写（暖色）*/