Questions tagged [php]

Use ONLY if PHP is directly relevant to the question and likely to be the source of your problem, not just because you're using a PHP library to connect to a database. PHP stands for Professional Hypertext Preprocessor, a widely used platform for dynamic web applications. If you have a general programming question about PHP, please ask it on Stack Overflow instead.

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2answers
4k views

Preventing mysql deadlocks in your php application that uses SELECT… LOCK IN SHARE MODE

If I understand SELECT ... LOCK IN SHARE MODE correctly, you can place it into a mysql transaction to select the rows you will be working with during that transaction. This is done in order to "lock ...
16
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1answer
107k views

How to get rid of “maximum user connections” error ?

I am using MySQLi for my webapp but whenever I want to visit some particular page, I get mysqli_connect() [function.mysqli-connect]: (42000/1203): User ***_user already has more than '...
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3answers
24k views

How to use insert delay with the InnoDB engine and use less connection for insert statements?

I'm working on an application which involves a lot of database writes, approximately ~70% inserts and 30% reads. This ratio would also include updates which I consider to be one read and one write. ...
2
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3answers
32k views

Connect Error (2054) - mysql_old_password issue still not solved

I use PHP 5.4.3 and I want to connect to a MySQL database (DB for brevity) remotely (the PHP script resides on a different server than the DB) with normal object-oriented programming (OOP) way: $...
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1answer
7k views

Connecting remote MySQL database to local MySQL database?

I want to write PHP code to be embedded in a Drupal7 module. I want to call a procedure which can copy newly generated data in the local MySQL database to a remote MySQL database. When data is ...
-1
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3answers
23k views

Host is not allowed to connect to MySQL

I have already uploaded some files in the free web host I chose and created a database there using phpMyAdmin v2.11.4 Also, I have Googled first this question before posting this here but I don't ...
9
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2answers
179k views

How to resolve too many connections and fatal error in mysql running on vps

I am running an application PHPlist on my linode server, simultaneously running 12 PHP scripts, each of which opens a MySQL connection. Now when I access PHPlist it often shows this error: Fatal ...
2
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3answers
8k views

Deleting Data From Multiple Tables

Suppose,I've a table called UNIVERSITY containing universities name: universityID universityNAME isACTIVE 7 GNDU 1 6 PU 1 5 ...
6
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3answers
23k views

Database design to track student attendance

I was having a doubt regarding the design of a database table to track students' attendance. Currently, my table students have atleast 4000 students. Creating a database for attendance to track their ...
5
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2answers
6k views

Escaping T-SQL Keywords

$sql = "SELECT Kill FROM tbl_pvporderview"; Problem is that I end up with: Incorrect syntax near the keyword 'Kill'. Because kill is a T-SQL command... any way to bypass it? I can't change the ...
10
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1answer
1k views

Calculate MATCH() AGAINST() scores from UNIFIED QUERY not FOR EACH TABLE

I am trying to have a score for entire section of SELECT statements SELECT *,MATCH(`result`) AGAINST('keyword') as `score` FROM `table1` WHERE MATCH(`result`) AGAINST('keyword') UNION SELECT *,MATCH(`...
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2answers
2k views

MySQL connection doesn't work anymore

I had two MySQL servers running (127.0.0.1:3306 and 127.0.0.1:3307). Now I get this strange error: mysql_connect(): Lost connection to MySQL server at 'reading initial communication packet' I can ...
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1answer
3k views

“Mysql has gone away” heavy multiple insert

I am stuck because Mysql server will go away after executing this part of code this function will update the database with the new RSS feeds which are stored in ToUpdate but Mysql stops working. Every ...
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1answer
88 views

Disadvantage of Changing database schema - Insert or delete new columns/tables in middle

As a read in lot of links , for e-commerce shopping sites, as it may require to add lot of attributes in regular basis, is it okay if we go with Flat tables ? Whats the disadvantage of changing ...
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2answers
11k views

query to select data between todays date as well as tomorrows date time upto specific time

I have database "raj" with table "pagination" In table pagination have "id", "actualtime" and "created" field id - auto_increment name- varchar created- datetime I want to display all rows which is ...
172
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11answers
406k views

connect to PostgreSQL server: FATAL: no pg_hba.conf entry for host

Hello I am trying to run a website sent to me but after doing so this error appeared connect to PostgreSQL server: FATAL: no pg_hba.conf entry for host "4X.XXX.XX.XXX", user "userXXX", database "...
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3answers
2k views

Why are there different levels of MySQL collation/charsets?

Looking at the MySQL server variables the server and database collation are set to latin1_swedish_ci but the collaction_connection is utf8_general_ci. Additionally, the collation/charset is set at ...
3
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3answers
519 views

Database design for changing number of fields

Google Contacts lets you to enter more than one phone number, or email address for a contact. You can add as many as you want. I don't know if there is a limit, other than practical list size. To ...
6
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5answers
7k views

How to securely connect app and database servers?

(Updated) For a start, I have my app and database on separate servers. It's easy to connect them, except I am not sure how to secure my database server. Here's what I've already done: Ran ...
1
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1answer
32k views

how to sync local mysql database and live server database?

My plan is to store data in my local MySQL database and after a time interval it will update my live MySQL database remotely. Is it possible? I'm planing a inventory management script in PHP MySQL. ...
7
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1answer
1k views

Application Settings in Database

In the past I have stored all generic settings and configuration items such as: custom application title, home address, version, debug, etc.. all in a "settings.php" file that I would include into all ...
4
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1answer
14k views

how to retrieve rows of different dates using IN clause

My table structure: +-----------------+--------------+------+-----+-------------------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------...
3
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1answer
765 views

Group activities in activity feed by users and products

On my website I'm building an activity feed where I got the basics done and are now making some improvements here and there. One of them is the grouping. I've built it so that if multiple users buys ...
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2answers
615 views

Questions since MySQL Startup

Have a weird question / (bug?) here. Using PHP My Admin I installed via apt-get on Ubuntu 13.10 Versions are as follows: Server version: 5.5.35-0ubuntu0.13.10.2 - (Ubuntu) Apache/2.4.6 (Ubuntu) ...
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3answers
2k views

db connection uses an anonymous logon instead of the domain user

I have this PHP code running under IIS: $serverName = "someServer\someServer"; $connectionInfo = array( "Database"=>"SOME_DB"); $conn = sqlsrv_connect( $serverName, $connectionInfo); if( $conn ) ...
6
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2answers
8k views

Implementing soft delete

Could someone please show or describe to me how to implement soft deletes? I have table of vouchers with these fields: id, username, password, serial. I want to display a given number of rows ...
3
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1answer
78 views

Storing undetermined amounts of user information (MySQL)

I've been looking into the best way of storing an undetermined amount of information submitted by a user. A friend of mine suggested using nested tables, however these don't appear to be a thing in ...
3
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2answers
2k views

Testing Query Speed

When I'm running a query for the first time, it takes x miliseconds to be executed. When I run it the second time it takes a lot less time. I assume that it is some caching involved in this mechanism, ...
3
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3answers
178 views

Continuously move data from server A to Server B while deleting the data in server A?

I'm developing an ad server that is expected to handle ad impressions/billion clicks per day. The most difficult challenge I am facing is moving data from one server to another. Basically the flow ...
3
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0answers
215 views

Inputting auto-incrementing, grouped, unique hashes?

Alright, here's what I've come up with so far: SET @id=(SELECT IFNULL(MAX(id) + 1, 0) FROM leads); UPDATE leads SET id=@id WHERE id IN ( SELECT id FROM (SELECT * FROM leads) AS something WHERE ...
1
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2answers
181 views

Efficient workflow/queries to save unique information?

I am saving company information in a database. There is a single table with an auto-incrementing key that is unique to each company. There are separate tables for emails, websites, phone numbers, and ...
1
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2answers
2k views

multiple connections on MySQL database with no users on httpd

My database seems to have many open connections despite having no users on httpd. mysql> SHOW PROCESSLIST; +-------+----------+--------------------+---------------------+---------+------+-------+--...
1
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1answer
98 views

Counting number of ids present in one table which is not presented on another for a particular user

I have two tables I want to count the number of ids presented on first which is not in second with respect to user id how can I do the same? For example. Case 1 Table 1. |id|data |...
0
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1answer
7k views

Combining 2 SELECT queries and printing the results in PostgreSQL

I have 2 queries which I want to use together to produce one output result to the user. The output describes to the user the journey to take to from A to B. I keep getting a syntax error when I try to ...
0
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1answer
677 views

Database-design for a small filter / search tag function

I'm building a search function in php for a database with 1k to 4k articles. It's going to be built on a tag system. I've been reading some tutorials, blog posts, q&a etc about it. Most important ...
0
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1answer
439 views

How to change a web application that now needs to become OLTP and OLAP application?

Previously, I did a simple web application for an enterprise client using PHP and MySQL. After some time, it has grown to a point where I realized after talking with people here that I need to treat ...