Question

我正在使用Koa2和node-sqlite3并遇到一个问题，我无法让Koa在返回身体之前等待db调用返回

简化示例：

app.get('/:name/:nickname', function (ctx) {
    var queryParams = [ctx.params.name, ctx.params.nickname]
    db.get("SELECT nickname FROM users WHERE name = ? AND nickname = ?", queryParams, function (err,result) {

        if (result == null) {
            console.log('Add new nickname')
            db.run("INSERT INTO users (name, nickname) VALUES (?, ?)", queryParams)
            ctx.body = 'Inserted user ' + ctx.params.nickname
        } else {
            console.log('Return existing nickname')
            ctx.body = result.nickname
        }
    })
    console.log('This is after')
})

总会返回如下内容：

这是之后的添加新昵称

如何让koa等待sqlite结果？

修改

道歉，这是一个简单的承诺：

app.get('/:name/:nickname', async (ctx, next) => {
    await new Promise((resolve, reject) => {
        var queryParams = [ctx.params.name, ctx.params.nickname]
        db.get("SELECT nickname FROM users WHERE name = ? AND nickname = ?", queryParams, function (err,result) {
            if (result == null) {
                // Add the name if not in DB
                db.run("INSERT INTO users (name, nickname) VALUES (?, ?)", queryParams)
                ctx.body = 'Inserted user ' + ctx.params.nickname
            } else {
                // Return nickname if in DB
                ctx.body = row.nickname
            }
            resolve()
        })
    })

    console.log('This is after')
})

如何让koa等待node-sqlite3结果？

0 个答案: