I have been learning how to program websites lately and the time has come for me to add a database. I have in fact already successfully created a MySQL database and interacted with it with PHP.
My problem is I can't seem to access a SQLite database file with it. I am using MAMP to host locally for now. Here is a snippet of the code I am using to access the db and find and print out a value stored on it.
<?php
$dbhandle = sqlite_open('/Applications/MAMP/db/sqlite/Users');
if ($dbhandle == false) die ('Unable to open database');
$dbquery = "SELECT * FROM usernames WHERE username=trevor";
$dbresult = sqlite_query($dbhandle, $dbquery);
echo sqlite_fetch_single($dbresult);
sqlite_close($dbhandle);
?>
As you have access to the database (your code doesn't die), I'd say there's got to be an error later ;-)
Looking at your SQL query, I see this :
SELECT * FROM usernames WHERE username=trevor
Are you sure you don't need to put quotes arround that string ?
Like this :
SELECT * FROM usernames WHERE username='trevor'
Also, notice that sqlite_fetch_single will only fetch the first row of your data -- which means you might need to use sqlite_fetch_array or sqlite_fetch_object if you want to access all the fields of your resulset.
Related
$conn_161 = "192.168.0.161"; //local serwer adress
$user_161 = "ME";
$pass_161 = "what_is_the_password?";
$connect_161 = mssql_connect($conn_161,$user_161,$pass_161);
mssql_select_db ( 'DUKENUKEN3D' , $connect_161 );
//as requested - 1st DB connection and 1st query
$q_duke = "select * from DUKE /*DB1*/";
$r_duke = mssql_query($q_wartownik,$connect_161); //result
$connect_different_db = mssql_connect($conn_161,$user_161,$pass_161);
mssql_select_db ( 'BIGMAN' , $connect_different_db );
//second db and query
$q_bigman = "select * from BIGPEOPLE /*DB2*/";
$r_bigman = mssql_query($q_bigman,$connect_different_db ); //result
Error:
Warning: mssql_query() [function.mssql-query]: message: Invalid object name 'DUKE'.
Yes I know mssql_select_db is old, but I need to use it in this project. As you see I try to connect to same server but select 2 different DB at the same time, and run queries in the same php page (to connect data from 2 different DB). It seems it is not valiable? I even tried to run mssql_select_db just before doing the query to second DB, and then changing it back to first DB.
I understand this is limitation of the library (I will run all queries from LAST selected DB).
Is there a workaroud? Because all I got is to create page inside invisible iframe and there run php page with different db connection - far from good solution.
I would expect that this will work the same as it would if you were running this in a SQL environment directly (e.g. you can try it in SSMS or from the command line).
You can specify the database name when you reference the table in the query: e.g.
select * from db1.dbo.DUKE
This is standard SQL Server behaviour whenever you want to refer to an object which is outside the context of the current database.
I am using the external authentication system. Therefore, there are a lot of user data, which is not available in Phorum.
I am using the last post module, although I want to get the information from the last post user, from my own user table (I have some data, like avatar, birth info etc). I want to show in my Phorum. How can I achieve this?
I've tried to simply connect via a: mysql_query(); but then I just get No database selected error.
I've searched for hours - I cannot find any documentation regarding getting custom data from your own user table.
I would recommend using mysqli, as mysql is deprecated. First make sure that your connection is correct. No database selected means you probably do not have your connection included at the top.
$con = mysqli_connect("localhost","username","password","database");
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: ".mysqli_connect_error());
}
Make sure that your sql statement looks like so (Notice the $con in the mysqli_query()):
$sql = "select * from TableName";
if ($que = mysqli_query($con, $sql)) {
// Query has ran
}
I usually connect php to mysql with localhost in my PC..
now i'm trying to put my project in cloud https://c9.io ,but i can't connect to mysql. i already have mysql database in cloud and put my project in same place...
mysql_connect("/lib/mysql/socket/mysql.sock","myUser","") or die(mysql_error());
i use script above to connect but i get Unknown MySQL server host '/lib/mysql/socket/mysql.sock' (1)
what shoul i do ?
Okay, so none of the above answers had worked for me, but fortunately I was able to setup a database and get it up and running my own way and I can now make queries and run them successfully, so I will share my method with you in hopes that anyone else scouring the internet can stumble across this and not have to go through the same head scratching that I did.
If you want the quick rundown, just scroll to Step 3 and read on from there. If you're a complete beginner, keep reading as I'll walk you through it in detail.
Couple things to mention:
You will have to setup a database via a Terminal in Cloud 9. I had no experience prior doing it in a Terminal before, but it's very simple to learn.
You can not use mysql functions, you have to use mysqli, since mysql functions are deprecated and Cloud 9 will not run them.
Step 1: Setup MySQL on Cloud 9 (in Terminal)
In your project, open up a New Terminal (click the plus-sign tab above the text editor space, select "New Terminal"). In the terminal, type mysql-ctl start and hit Enter. MySQL will start up in the back, but you won't get any response back in the terminal.
Next, type mysql-ctl cli and hit Enter. You should see some text that starts off as Welcome to the MySQL monitor.... Congrats, you've setup MySQL on your Cloud 9 project.
Step 2: Create a test database (in Terminal)
You can actually go ahead and create your official database if you like, but for this sake I'll just make a database that holds a table that holds an ID and a username. So here's the steps to setting up a database and a table. If you've used MySQL and databases before, then this should be cake, but I'll explain it in detail for those who might not fully understand MySQL .
Type SHOW DATABASES; and hit Enter. This will show a list of current databases within your project. You can enter this any time you want to see a list of your databases on the current project.
Type in CREATE DATABASE sample_db; and hit Enter. You should get a Query OK, 1 Row affected. which means the query was successful. You can name the database whatever you like, but for this little walk-through, I named it sample_db.
Type in USE sample_db; and hit Enter. This selects sample_db from the list of databases.
Type in CREATE TABLE users (id INT(11), username VARCHAR(20));, and hit Enter. This creates a table named users with two columns: id and username. The number in parentheses represents the character limit the column will store in the database. In this case for example, username won't hold a string longer than 20 characters in length.
Type in INSERT INTO users (id, username) VALUES (1, "graham12");, and hit Enter. This will add the id of 1 and a username graham12 in the table. Since the id column is an INT, we do not put quotes around it.
Type in SELECT * FROM users;, and hit Enter. This will show everything that is in the users table. The only entry in there should be what we inserted from the last step we just did.
Step 3: Get the credentials you'll need to connect to the database from PHP. (in Terminal)
Now we have some data in our table that we can test our mysqli connection with. But first, we have to get the credentials we will need to connect to the database in PHP. In Cloud 9, we will need 5 credentials to connect:
Host name
Username
Password
Database name
Port #
Username, password, database name, and port #, are practically already known to you by now. I'll explain:
Host name - Type in SHOW VARIABLES WHERE Variable_name = 'hostname';, and hit Enter. You'll get a table that has 2 columns: Variable_name and Value. In the Value column you should see something like yourUsername-yourProjectName-XXXXXXX, where the X's are a 7 digit number. Write this number down or save it some where. This is your host name. (If you're getting the quick rundown on this walkthrough, just start a new terminal and start up your mysql and select the database you want to use, then type in SHOW VARIABLES WHERE Variable_name = 'hostname';. Re-read this step from the beginning if you're confused.)
Username - Your username that you use to log in to Cloud 9.
Password - There is NO password for your database in Cloud 9.
Database name - This would be sample_db or whatever you named your database;
Port # - is 3306. In Cloud 9, all of your projects are wired to 3306. This is a universal constant of Cloud 9. It will not be anything else. Write this as you would an integer, not as a string. mysqli_connect() will interpret the port # as a long data type.
Last Step: Connect to the database with PHP! (using PHP)
Open up a PHP file and name it whatever you like.
I'll pretend that my host name is graham12-sample_db-1234567 for this example and that this is what my data looks like:
Host name: "graham12-sample_db-1234567"
Username: "graham12"
Password: ""
Database name: "sample_db"
Port #: 3306
So in PHP, insert your credentials accordingly:
<?php
//Connect to the database
$host = "grahamsutt12-sample_db-1234567"; //See Step 3 about how to get host name
$user = "grahamsutt12"; //Your Cloud 9 username
$pass = ""; //Remember, there is NO password!
$db = "sample_db"; //Your database name you want to connect to
$port = 3306; //The port #. It is always 3306
$connection = mysqli_connect($host, $user, $pass, $db, $port)or die(mysql_error());
//And now to perform a simple query to make sure it's working
$query = "SELECT * FROM users";
$result = mysqli_query($connection, $query);
while ($row = mysqli_fetch_assoc($result)) {
echo "The ID is: " . $row['id'] . " and the Username is: " . $row['username'];
}
?>
If you get a result and no error then you have successfully setup a database and formed a connection to it with PHP in Cloud 9. You should now be able to make all the queries you can normally make.
Note: I demonstrated the last part without using parameterized queries for the sake of being simple. You should always use parameterized queries when working with real web applications. You can get more info on that here: MySQLi Prepared Statements.
For starters, the mysql_* functions are deprecated so you shouldn't be using them. Look at PDO or mysqli instead. Next, you'll want to try this per the example docs:
$link = mysql_connect('localhost:/lib/mysql/socket/mysql.sock', 'myUser', '') or die(mysql_error());
To find the ip running you project, create a test file with the code below, run it and put the result as host.
<?php
$ip = getenv("REMOTE_ADDR") ;
Echo "Your IP is " . $ip;
?>
You are using Cloud9 so it's a little different to use. To connect to MySQL you have to first create the MySQL server in C9. Type this in C9's command line:
mysql-ctl start
C9 will create your mysql server.
MySQL 5.1 database added. Please make note of these credentials:
Root User: <username>
Database Name: c9
Next to find your IP address type:
echo $IP
Now use this code with your username, the ip address, no password and the 'c9' database to access MySQL:
mysql_connect("<$IP>","<username>","") or die(mysql_error());
mysql_select_db("c9")
Hope this helps
The documentation show how start, stop, and run the mysql environment.
Start the MySQL shell mysql-ctl start then in yor file.php:
$ip = getenv("REMOTE_ADDR");
$port = "3306";
$user = "YorUsername";
$DB = "c9";
$conn = mysql_connect('$ip', '$user', '', '$db', '$port')or die(mysql_error());
mysql_select_db('$db','$conn')or die(mysql_error());
mysql_query("select * from YourTableName",'$conn')or die(mysql_error());
The line getenv("REMOTE_ADDR") return the same local IP as the application you run on Cloud9.
I'm using HostMonster as my web host and I'm trying connect to a database I created using MySQL inside of HostMonster. In order to call that database in my website do I need to use PHP? Or is there a way to create a javascript OnClick function that can call the database. I'm not using ASP.Net so it's not quite as simple as I would like it. Just curious if the best solution is PHP, if so I guess I should go learn it.
what are you planning to do with the database, other than just 'calling it'? You will need some language like PHP to connect to the DB to retrieve, insert, update or delete data in the DB.
here is a code for connection MySQL from PHP using MYSQLI extension
<?php
$dba_host='localhost';
$dba_name='root';
$dba_pass='';
$dba_db='sn';
$con=mysqli_connect($dba_host,$dba_name,$dba_pass,$dba_db) or die('Connection Refused !');
$stmt=mysqli_prepare($con,"SELECT UID FROM Main");
mysqli_stmt_execute($stmt);
mysqli_stmt_bind_result($stmt, $value);
while(mysqli_stmt_fetch($stmt))
$result[] = $value;
mysqli_stmt_close($stmt);
mysqli_close($con);
?>
Your javascript onClick function is running on the client side (in the browser) and the database is running on the server-side. You will need a server-side language to get the information from the database and send it to the browser.
You do not HAVE to use PHP to connect to a MYSQL database. Also, you can't connect to your database using only client-side javascript (ie. an onClick() function). You need to use a server side language, PHP is one choice.
To connect to a MYSQL database on hostmonster using PHP you will need to know your credentials that use to log into phpMyAdmin from your cpanel. Once you have made the connection you can then select the MYSQL database that you created. Once the database is selected you can query it using the "mysql_query" function in PHP. The following code does all of that and stores the results of the MYSQL query in a PHP variable called $result.
<?php
$con = mysql_connect("www.yourdomain.com","phpMyAdmin_username","phpMyAdmin_password");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("mysql_database_name", $con);
$query = "SELECT * FROM TableName"
$result = mysql_query($query);
?>
Now you've got the results of the query inside the PHP variable $result and you can use it anyway you like.
If you put this in your 'public_html' folder and named it 'index.php' or 'index.html' this would automatically be run when someone went to www.yourdomain.com.
You can find a great tutorial series on PHP here http://thenewboston.org/list.php?cat=11.
I am new to Joomla and new to php (wish I was so new in age too). I have installed joomla on a local apache webserver. I am trying to use some php code in a joomla article in order to fetch some data from a Sybase ASE 12.5 database. I installed sourcerer and started to try an ODBC connection using a system DSN (which I verified it is working):
{source}
<?php
echo 'This text is placed through <b>PHP</b>!';
echo '<p>';
echo '</p>';
$conn = odbc_connect('myDSN', 'sa', 'myPassword') or die('Could not connect !');
echo 'Connected successfully';
$sql = 'SELECT day, name FROM my_table where month = 1';
odbc_close($conn);
?>
{/source}
The above code doesn't do much, but this is how far I can get without problems. I refresh the joomla page and I see inside the article's text:
...
This text is placed through PHP!
Connected successfully
...
Seems ok, the connection obviously established (I verified this by stopping the sybase service and getting the "Could not connect" message). Then I added one more line, just below the $sql assignment.
$rs = odbc_exec($conn,$sql);
I refresh and ...I see nothing coming from the script (not even the "This text is placed through PHP!").
Obviously, I see nothing if I include code to echo the contents of $rs. I also tried this but in vain.
if (!$rs)
{exit("Error in SQL");}
Once I add the odbc_exec command, the entire script ceases working.
In php.ini I read:
; Windows Extensions
; Note that ODBC support is built in, so no dll is needed for it.
Do you have any idea what is going wrong?
UPDATE
Connecting to a MySQL database using code like this, works like a charm.
To answer your question
Is this the correct way to get data
from another database in to an article
or should I use some plug-in to do
that?
The correct way is to use JDatabase object which you get by JFactory::getDBO() or JDatabase::getInstance(), see Joomla JDatabase documentation.
$db = JDatabase::getInstance( $databasConfigArray );
$db->setQuery('your query');
$data = $db->loadObjectList();
Here is a good tutorial showing how to connect to multiple databases in Joomla, there is even source code for helper class.
Also look at this thread Connecting to 3rd party databse in Joomla!?