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