Does SQLite3 have prepared statements in Node.js? - sql

Question

From the npm docs, only visible prepared statements are for insert. Does these prepared statement work for Select, update, and delete?
I tried for select, there isn't a .each function where the rows are called back. Anyone been able to do this or have links to resources, cause I can sure as hell unable to find any.

Answer 1

According to the node-sqlite3 API documentation, you can use parameters in your SQL queries in several different ways:
// Directly in the function arguments.
db.run("UPDATE tbl SET name = ? WHERE id = ?", "bar", 2);
// As an array.
db.run("UPDATE tbl SET name = ? WHERE id = ?", [ "bar", 2 ]);
// As an object with named parameters.
db.run("UPDATE tbl SET name = $name WHERE id = $id", {
$id: 2,
$name: "bar"
});

Answer 2

Yes, prepared statements are supported.
With node-sqlite3:
var sqlite3 = require('sqlite3').verbose();
var db = new sqlite3.Database('data.db');
db.serialize(function() {
var stmt = db.prepare("INSERT INTO users VALUES (?,?)");
for (var i = 0; i < 10; i++) {
stmt.run("user " + i, "email " + i);
}
stmt.finalize();
stmt = db.prepare("SELECT * FROM users WHERE id=?");
stmt.each(userId, function(err, row) {
console.log(row.name, row.email);
}, function(err, count) {
stmt.finalize();
});
});
With better-sqlite3:
var Database = require('better-sqlite3');
var db = new Database('foobar.db', options);
var stmt = db.prepare("INSERT INTO users VALUES (?,?)");
for (var i = 0; i < 10; i++) {
stmt.run("user " + i, "email " + i);
}
var stmt = db.prepare('SELECT * FROM users WHERE id=?');
var row = stmt.get(userId);
console.log(row.name, row.email);