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

问题描述

我发现自己试图创建一个postgres数据库，所以我安装了postgres并使用initdb /usr/local/pgsql/data启动了服务器，然后用postgres -D /usr/local/pgsql/data启动了该实例，现在如何通过节点与之交互?例如，connectionstring是什么，或者我怎么能知道它是什么.

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.

可以在这里找到我使用的node.js中的接口 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:-现在不推荐使用query.on函数，因此上述代码无法按预期运行.作为解决方案，请查看:- 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

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