node.js - Express - 为什么代码永远不会返回？

Question

我是 Express 菜鸟，不明白:为什么下面的代码永远不会返回？它似乎只是挂着。

router.post('/post',function(req,res){

    var file = "test.db"
    var exists = fs.existsSync(file);
    if(!exists) {
        console.log("Creating DB file.");
        fs.openSync(file, "w");
    }
    var sqlite3 = require("sqlite3").verbose();
    var db = new sqlite3.Database(file);

    db.serialize(function() {
        if(!exists) {
            db.run("CREATE TABLE Stuff (thing TEXT)");
        }
        var stmt = db.prepare("INSERT INTO Stuff(thing) VALUES (99999)");
        stmt.finalize();
    });

    db.close();
}); //seems to hang at this line.

Answer 1

您需要调用 res.send 或 res.end 以从请求中返回某些内容并防止其挂起。

router.post('/post',function(req,res){

var file = "test.db"
var exists = fs.existsSync(file);
if(!exists) {
    console.log("Creating DB file.");
    fs.openSync(file, "w");
}
var sqlite3 = require("sqlite3").verbose();
var db = new sqlite3.Database(file);

db.serialize(function() {
    if(!exists) {
        db.run("CREATE TABLE Stuff (thing TEXT)");
    }
    var stmt = db.prepare("INSERT INTO Stuff(thing) VALUES (99999)");
    stmt.finalize();
});

db.close();
res.send("<h1>Done</h1>");
}); //seems to hang at this line.