Writing to File in Emscripten

Emscripten provides the writeFile to write data to the virtual file system.

Usage

To write a file in the Emscripten file system, you can use the following syntax:

kuzu.FS.writeFile(path, data);

• path (string) – The file to which to write data.
• data (string|ArrayBufferView) – The data to write. A string will always be decoded as UTF-8.

Example

kuzu.FS.writeFile("/user.csv", "Adam,30\nKarissa,40\nZhang,50\nNoura,2");

This will create a file named user.csv in the virtual file system, containing four rows of user data (name and age).

Full Example

Below is a complete example of how you can use the writeFile API to write a CSV file and import it into a Kuzu database:

// Step 1: Initialize the Kuzu Database
const db = await kuzu.Database();

// Step 2: Create a new connection to the database
const conn = await kuzu.Connection(db);

// Step 3: Write data to the Emscripten virtual file system
kuzu.FS.writeFile("/user.csv", "Adam,30\nKarissa,40\nZhang,50\nNoura,2");

// Step 4: Read the content of the file from the virtual file system to verify
const fileContent = kuzu.FS.readFile("/user.csv", { encoding: 'utf8' });
console.log("File Content:\n", fileContent);

// Step 5: Create a table for storing user data in the database
await conn.execute("CREATE NODE TABLE User(name STRING, age INT64, PRIMARY KEY (name))");

// Step 6: Import data from the written file into the User table
await conn.execute('COPY User FROM "/user.csv";');