我正在尝试在 golang 中使用命名参数查询，如下所示：
stmt, err := db.Prepare("insert into users(name, email) values(@name, @email)")
if err != nil {
//error handling
}
res, err := stmt.Exec(sql.Named("name", name), sql.Named("email", email))
if err != nil {
//error: sql: expected 0 arguments, got 2
}
我收到以下错误：“sql：预期 0 个参数，得到 2 个”。
编写此查询的正确方法是什么？
我正在尝试 Google 在https://www.polymer-project.org/1.0/start/first-element/intro提供的示例代码。
这是我到目前为止：
索引.html：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" name="viewport">
<script src="https://polygit.org/components/webcomponentsjs/webcomponents-lite.js"></script>
<link href="/my_components/icon-toggle-demo.html" rel="import">
</head>
<body>
<icon-toggle-demo toggle-icon="star"></icon-toggle-demo>
</body>
</html>
图标切换演示.html：
<link rel="import" href="https://polygit.org/components/polymer/polymer.html">
<link rel="import" href="https://polygit.org/components/iron-icons/iron-icons.html">
<link rel="import" href="icon-toggle.html">
<dom-module id="icon-toggle-demo">
<template>
<style>
:host {
font-family: sans-serif;
};
</style>
<h3>Statically-configured icon-toggles</h3>
<icon-toggle toggle-icon="star"></icon-toggle>
<icon-toggle toggle-icon="star" pressed></icon-toggle>
<h3>Data-bound icon-toggle</h3>
<!-- use a computed binding to generate the message -->
<div><span>[[message(isFav)]]</span></div>
<!-- curly brackets ({{}}} allow two-way …我最近修改了我的应用程序，发现测试开始挂起。这是精简的测试代码：
package app_test
import (
"testing"
"github.com/kargirwar/prosql-go/db"
)
func TestApp(t *testing.T) {
db.SetDbPath("")
}
db包如下：
package db
import (
"os"
"context"
"database/sql"
_ "github.com/mattn/go-sqlite3"
"path/filepath"
)
var dbPath string
func SetDbPath(path string) {
dbPath = path
}
func OpenDb(ctx context.Context, db string) (*sql.DB, error) {
db = filepath.Join(dbPath, db)
_, err := os.OpenFile(db, os.O_RDWR, 0600)
if err != nil {
return nil, err
}
return sql.Open("sqlite3", "file:"+db+"?_foreign_keys=true")
}
我将问题追溯到这种依赖关系：
_ "github.com/mattn/go-sqlite3"
如果我将其注释掉，那么测试就会正常运行，否则就会挂起。
奇怪的是， go run 工作得很好。Google 说 go-sqlite3 需要时间来编译，但是为什么 go …
考虑以下简单的应用程序：
<div id="app">
<counters :counter1="counter1" :counter2="counter2">
</counters>
<button @click="onClick">Click Here</button>
</div>
JS：
Vue.component('counters', {
template: '<h1>{{counter1.count}} {{counter2.count}}</h1>',
//template: '<h1>{{count1}} {{count2}}</h1>',
props: {
'counter1': {
type: Object
},
'counter2': {
type: Object
}
},
data: function() {
return {
'count1': 0,
'count2': 0,
}
},
watch: {
counter1: function(n, o) {
console.log(JSON.stringify(n));
this.count1 = n.count;
},
counter2: function(n, o) {
console.log(JSON.stringify(n));
this.count2 = n.count;
}
}
});
var vm = new Vue({
el: '#app',
data: {
counter1: {
count: 0
}, …