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• How can I employ "if exists" for creating or dropping an index in MySQL?

  - by Paul

  I was wondering if there's a way to check if an index exists before creating it or destroying it on MySQL. It appears that there was a feature request for this a few years back, but I can't find any documentation for a solution. This needs to be done in a PHP app using MDB2.

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• import a text file into a temporary table using 'Load data infile' in a stored procedure- MySQL

  - by Pankaj

  I need to import a text file into a temporary table and from that select portions of it to insert in different tables. I wanted to use 'LOAD DATA INFILE'. Is there any way, i can use 'Load data infile' in a stored procedure. I am using mysql. LOAD DATA LOCAL INFILE 'C:\\MyData.txt' INTO TABLE tempprod fields terminated by ',' lines terminated by '\r\n'; SELECT * FROM product p;

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• ASP.Net (C#) & MSQL -or- PHP & MySQL for Performance?

  - by Mike Curry

  Money, Staff, Skill and preference to open source or commercial is neutral. Lets take the best of the best programmers (for arguments sake) and think about this: What will perform better overall: PHP & MySQL or ASP.Net & Microsoft SQL (I don't want biased answers, just looking for Performance, and Speed).

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• MYSQL trigger to select from and update the same table gives error #1241 - Operand should contain 1 column(s)

  - by Bipin

  when i try to select and update the same table mysql gives error error #1241 - Operand should contain 1 column(s) The trigger is DELIMITER $$ CREATE TRIGGER visitor_validation BEFORE INSERT ON ratingsvisitors FOR EACH ROW BEGIN SET @ifexists = (SELECT * FROM ratingcounttracks WHERE userid=New.vistorid AND likedate=New.likevalidation AND countfor=New.likeordislike); IF (@ifexists = NULL) THEN INSERT INTO ratingcounttracks(userid, likedate, clickcount,countfor) values (New.vistorid, New.likevalidation ,'1',New.likeordislike); ELSE UPDATE ratingcounttracks SET clickcount=clickcount+1 WHERE userid=New.vistorid AND likedate=New.likevalidation AND countfor=New.likeordislike; END IF; END$$

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• How do I select a random record efficiently in MySQL?

  - by user198729

  mysql> EXPLAIN SELECT * FROM urls ORDER BY RAND() LIMIT 1; +----+-------------+-------+------+---------------+------+---------+------+-------+---------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+---------------+------+---------+------+-------+---------------------------------+ | 1 | SIMPLE | urls | ALL | NULL | NULL | NULL | NULL | 62228 | Using temporary; Using filesort | +----+-------------+-------+------+---------------+------+---------+------+-------+---------------------------------+ The above doesn't qualify as efficient,how should I do it properly?

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• Is there a way to listen for changes in an MySQL database table using Java and JDBC?

  - by adrian7

  I have a number of users which are logged in at a time in my desktop application. They are working on the same table (create, read, update, delete data) so I have to update their views, to reflect changes, every few seconds - currently I am thinking to use a different thread to do that. I am using the MySQL database engine. Is there a way, using JDBC, to listen for changes on a specific table in the database and triggering a Java method only when changes are made?

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• how do I display list of URLS say maximum 50 per web page from MySQL database??

  - by mathew

  I do have thousands of urls in my database. what I want to do is display all urls in multiple pages say number of URLS per page is 100 and alphabetically then when ever a user search for a URL info it should get updated on relevant page. for example if it is google.com then it should get updated on "G" page and no duplicate entry. how can I do this with PHP and MySQL??

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• Sorting mysql array value after string chars swapped from fetched DB data.

  - by Shail Patel

  I want to sort one column fetched from mysql DB, and stored in an array. After fetching I am doing below steps. 1- DB Fetching fields array in row format. ->Field1, Field2, Field3, Field4, Field5 2- From that fields array One columns data [Field3], swapping string keywords. eg. AB013, DB131, RS001 to->013AB, 131DB, 001RS Now I want to sort above value in new string format like-> 001RS, 013AB, 131DB

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• How many millions records can Mysql reasonably deal with with .NET ?

  - by asksuperuser

  Anybody can tell his experience with MySQL and .NET dealing with millions of records ? Need to be able to cope with 50 to 100 Millions records.

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• Is it possible to apply the Replication mechanism on single MySQL server?

  - by Parth

  Is it possible to apply the Replication mechanism on single MySQL server? I want to replicate the changes done in test db to Main db in the same server, so can i use this Replication mechanism on same server?

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• Is there a way to delete the most recent entry in MySQL using PHP?

  - by user300371

  I want to delete the most recent entry in MySQL using PHP, is there a function that allows me to do that? $query2 = "DELETE FROM test WHERE ___";

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• How to use Triggers for Logging History of database change in MySQL?

  - by Parth

  How to use Triggers for Logging History of database change in MySQL? If yes, then is it possible to create a sepearte db for trigger tables for tracking history of other Db tables??

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• How to get structed result using nested set in MySQL and PHP?

  - by user198729

  There is no limitation on the depth. How to get the structed branch or even entire tree? The definition is from here: http://dev.mysql.com/tech-resources/articles/hierarchical-data.html

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• HOw do I show number of fetching of a data in a MySQL data base??

  - by mathew

  HI I would like to show to user how many time a data has been accessed. I am using MySQl and PHP...

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• How do I identify which MySQL slave has responded?

  - by Kynth

  I have a MySql Master server replicating to three Slaves. A legacy website is performing load-balanced Reads from the Slaves. Is there a method of identifying from the website which of the Slaves is serving a Read request? I'd prefer a function that I can use to return a server name or ip address as part of the SELECT, but any reasonable method will do. Thank you in advance.

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• how to send multiple row to mysql at same time(like bulk copy)?

  - by Ayyappan.Anbalagan

  I am using asp.net + Mysql. I have multiple rows in my dataset; I have to store the rows in my database table. How to do that?

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• Migrating server, don't wanna lose MySQL data. Is Master-Master setup viable?

  - by royh

  I am moving to a new server and thinking about how to keep my 2 MySQL server data consistent is causing me to lose both sleep and hair. I was thinking about using a Master-Master setup to ensure that I lose nothing in the process. How viable is that. Any potential gotchas?

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• How can we re-use the deleted id from any MySQL-DB table?

  - by Parth

  How can we re-use the deleted id from any MySQL-DB table? If I want to rollback the deleted ID , can we do it anyhow?

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• How to save Excel date time cell into MySQL using VBA?

  - by mysqlizor

  The mysql table has a DATETIME field. I want to INSERT a new row into this field using the cell data from the Excel worksheet. But I cannot use the datetime formatted cell value in a INSERT INTO query. How can I implement this?

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• Whats the best way to backup a MySQL table without file privileges and command line access?

  - by asdasd

  Im on a not so great shared hosting plan. I cant get file privileges for mysql so i cant do SELECT INTO outfile, and i dont have command line access so I cant use mysqldump. What can I do to get a decent table backup?

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• How to restrict user from modifying data in mysql data base?

  - by Paul

  We need to deploy application(developed by Java) WAR file in client place which make use of MySql 5.0. But we would like to restrict the user from modifying any data in the database. Is there any way to protect data. The client can make use of the application but they should not be able to change any value in database. How to do that?

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• is there any way to catch ROLLUP (mysql) figures as values in php?

  - by JPro

  Hi, I am using group by ID WITH ROLLUP in my mysql query. The thing is I want to store these totals in a variable in php. Is there any way to do that? Thanks.

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• How should i store availability calendar information in mysql? for [id] [date] [available/unavailab

  - by Haroldo

  I'm building a simple calendar for holiday cottages to show when they are booked or available. What would be the fastest mysql table design for this, bearing in mind when users mark dates as available/booked they will do so via a start date and an end date. i can see 2 obvious options Store 'booked' data for every day [more rows] or, store 'booked' data with 2 columns a start_date and end_date [more processing?] Which is best or is there another method i'm missing?

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• PHP - get MySQL query results as their native data type?

  - by redidas

  I've tried fetching MySQL query results using mysql_fetch_row() mysql_result() and numeric values are being returned as strings. Is there any way to fetch the data as its datatype stored in the table? The application will be querying many different queries so I will be unable to cast the values as the intended datatype on a 1 by 1 basis.

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• Best way to build a SMART mySQL & PHP search engine?

  - by Kyle R

  What is the best way to build a mySQL & PHP search? I am currently using things like %term% I want it to be able to find the result even if they spell it slightly wrong, for example: Field value = "One: Stop Shop: They search: One Shop Stop OR One Stop Shop Etc.. I want a really smart search so they find the information even if they don't search the exact thing. What is the best way to build a smart search like this?

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