postgresql – 如何通过Node.js连接到Postgres

我使用的node.js中的接口可以在这里找到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();
});