检查与我的数据库js的连接的最佳方法

Question

I work on a web interface which receives and send informations to a distant PostGreSQL database.

From what I found on the internet it seems that the best way is to create a small php script in an external .php file.

I followed that idea,

so I have that script pg_connection.php which tests the connectivity to my database (with a pg_connect) in that style :

$db = pg_connect("host=localhost port=5432 dbname=**** user=**** password=****") 
or die("Not Connected");
if ($db) {echo (Connected);} else {echo (Not Connected);}

If I launch only that pg_connection.php in my webbrowser, it works fine (I just have wrotten Connected with the correct login infos entered in my script or Not connected if I put a random ip address).

Then in my .js(+jquery) external script I use :

$(document).ready(function(){
$("#dbstatus").load("php-services/pg_connection.php");
var dbstatus = new String();
dbstatus = $("#dbstatus").val();

if (dbstatus == "Connected")
{ /*jquery code to show a green light on a section in my html page*/}
else { /*jquery code to show a red light*/}
}

And that works partially :

In my $("#dbstatus") object it will replace the default text by Connected or Not Connected, But it doesn't produce any effect on the green/red light in my conditionnal

Then I went in my Chrome console and type dbstatus, and I realized that the content of my var is

<div id=​"dbstatus" class=​"span3">​Connected​</div>​

when I expected it to be just "Connected".

Any idea on how to clean that var from all these extra html stuffs ?

Is there more simple method implemented in js or Jquery to check a postgreSQL database status ?

Answer 1

Instead of $("#dbstatus").val(); use $("#dbstatus").html(); .

Answer 2

Try to modify your code to:

$db = pg_connect("host=localhost port=5432 dbname=**** user=**** password=****") or die("0");
if ($db) {echo "1";} else {echo "0"}

And in JS:

$(document).ready(function(){
  $.ajax({
    url: "http://fullpathto/php-services/pg_connection.php",
    cache: false
  }).done(function( result ) {
    if(result=="1") {
      /*jquery code to show a green light on a section in my html page*/
    }
    else
    {
      /*jquery code to show a red light*/}
    }
  });
});