如何通过 Node.js 连接到 Postgres [英] How to make connection to Postgres via Node.js

查看:40
本文介绍了如何通过 Node.js 连接到 Postgres的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我发现自己在尝试创建 postgres 数据库,所以我安装了 postgres 并使用 initdb/usr/local/pgsql/data 启动了一个服务器,然后我使用 postgres 启动了该实例 -D/usr/local/pgsql/data 现在我如何通过节点与它交互?例如,connectionstring 是什么,或者我怎样才能找出它是什么.

I find myself trying to create a postgres database, so I installed postgres and started a server with initdb /usr/local/pgsql/data, then I started that instance with postgres -D /usr/local/pgsql/data now how can I interact with this through node? For example, what would the connectionstring be, or how am I able to find out what it is.

推荐答案

这是我用来将 node.js 连接到我的 Postgres 数据库的示例.

Here is an example I used to connect node.js to my Postgres database.

我使用的 node.js 中的接口可以在这里找到 https://github.com/brianc/node-postgres

The interface in node.js that I used can be found here https://github.com/brianc/node-postgres

var pg = require('pg');
var conString = "postgres://YourUserName:YourPassword@localhost:5432/YourDatabase";

var client = new pg.Client(conString);
client.connect();

//queries are queued and executed one after another once the connection becomes available
var x = 1000;

while (x > 0) {
    client.query("INSERT INTO junk(name, a_number) values('Ted',12)");
    client.query("INSERT INTO junk(name, a_number) values($1, $2)", ['John', x]);
    x = x - 1;
}

var query = client.query("SELECT * FROM junk");
//fired after last row is emitted

query.on('row', function(row) {
    console.log(row);
});

query.on('end', function() {
    client.end();
});



//queries can be executed either via text/parameter values passed as individual arguments
//or by passing an options object containing text, (optional) parameter values, and (optional) query name
client.query({
    name: 'insert beatle',
    text: "INSERT INTO beatles(name, height, birthday) values($1, $2, $3)",
    values: ['George', 70, new Date(1946, 02, 14)]
});

//subsequent queries with the same name will be executed without re-parsing the query plan by postgres
client.query({
    name: 'insert beatle',
    values: ['Paul', 63, new Date(1945, 04, 03)]
});
var query = client.query("SELECT * FROM beatles WHERE name = $1", ['john']);

//can stream row results back 1 at a time
query.on('row', function(row) {
    console.log(row);
    console.log("Beatle name: %s", row.name); //Beatle name: John
    console.log("Beatle birth year: %d", row.birthday.getYear()); //dates are returned as javascript dates
    console.log("Beatle height: %d' %d"", Math.floor(row.height / 12), row.height % 12); //integers are returned as javascript ints
});

//fired after last row is emitted
query.on('end', function() {
    client.end();
});

更新:- query.on 函数现已弃用,因此上述代码将无法按预期工作.作为此外观的解决方案:- query.on 不是函数

UPDATE:- THE query.on function is now deprecated and hence the above code will not work as intended. As a solution for this look at:- query.on is not a function

这篇关于如何通过 Node.js 连接到 Postgres的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

查看全文
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆