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node-sqlite3でプレースホルダ使用時に実際のSQLを確認する

Posted at

node-sqlite3でプレースホルダを使用している時に、実際に実行されているSQL文を確認したい。
そんな時は"trace"にコールバックを登録する。

trace.js
var sqlite = require("sqlite3").verbose();
var db = new sqlite.Database("test.db");

db.on("trace", function(sql) {
  console.log(sql);
});

obj = {
	title: "6月に自主制作を行いました!",
	type: "develop"
};

db.all(
	"SELECT * FROM entries where title=? and type=?",
	[obj.title, obj.type],
	function(error, rows) {
		rows.forEach(function(row){
			console.log("title :" + row.title + ", type:" + row.type);
		});
	}
);

実行すると

SELECT * FROM entries where title='6月に自主制作を行いました!' and type='develop'
title :6月に自主制作を行いました!, type:develop

って出力される。上の方がtraceで出してるSQL

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