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可視化

SQL 轉 ER 圖

解析 CREATE TABLE 語句並自動生成 Mermaid 格式的 ER 圖。在瀏覽器中安全地可視化您的資料庫設計。

指南: How to use & features

  • Enter or paste SQL `CREATE TABLE` statements into the text area.
  • Click the "Visualize" button to generate and display the ER diagram using Mermaid syntax.
  • Table relationships (Foreign Keys) are automatically extracted from `FOREIGN KEY` or `REFERENCES` clauses.
  • Use the "Copy Mermaid Code" button to save the generated syntax to your clipboard.
  • Your schema data is processed entirely in the browser, ensuring privacy and security.

範例: Examples

Users and Posts (One-to-Many)

輸入範例

CREATE TABLE users (
  id INT PRIMARY KEY,
  name VARCHAR(50)
);

CREATE TABLE posts (
  id INT PRIMARY KEY,
  user_id INT REFERENCES users(id),
  title VARCHAR(100)
);

輸出範例

erDiagram
    users {
        INT id PK
        VARCHAR(50) name
    }
    posts {
        INT id PK
        INT user_id
        VARCHAR(100) title
    }

    posts }|--|| users : "user_id -> id"

FAQ: FAQ

  • Does it support all SQL dialects?

    It supports standard SQL CREATE TABLE syntax. Some highly specific proprietary vendor extensions may not be fully parsed as it uses a custom regex-based parser.
  • Is my data sent to a server?

    No. All processing is done locally in your browser via JavaScript. Your SQL code never leaves your computer.
  • What if relationships are not showing up?

    Ensure that your statements include FOREIGN KEY or REFERENCES clauses. The tool relies on these constraints to identify and draw relationships.

使用情境: Common Use Cases

  • Database Documentation

    Quickly visualize and document existing table structures by pasting SQL exports.

  • Schema Design Verification

    Self-check your DDL to ensure that relationships and constraints are correctly defined during the design phase.

  • Team Collaboration

    Share specific sub-system structures with your team using lightweight Mermaid syntax before generating full documentation.

注意: Notes & Limitations

  • Limited SQL Syntax

    Statements other than CREATE TABLE (e.g., stored procedures, triggers, complex INDEX definitions) are ignored.

  • Performance with Large Schemas

    Very large schemas with dozens of tables may significantly impact browser rendering performance.

  • Syntax Errors

    Incomplete or malformed SQL statements (missing parentheses, typos) will result in parsing failures.

erDiagram USERS ||--o{ POSTS : "user_id -> id" USERS { int id PK string name } POSTS { int id PK int user_id string title }

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