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• How can I tell when a MySQL table was last updated?

  - by RaGE

  In the footer of my page, I would like to add something like "last updated the xx/xx/200x"; with this date being the last time a certain mySQL table has been updated. What is the best way to do that ? Is there a function to retrieve the date ? Should I make an access to the database everytime my footer is displayed ?

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• Quickest way to dump Python dictionary (dict) object to a MySQL table?

  - by NJTechGuy

  I have a dict object. I dumped the data using this: for alldata in data: # print all data to screen print data[alldata] Each field had brackets [] and 'None' values for NULLS and date.datetime for date values. How do I dump this dict to MySQL table? Thank you!

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• How to update a table using a select group by in a second one and itself as the data source in MySQL

  - by Jader Dias

  I can do this: SELECT t2.value + sum(t3.value) FROM tableA t2, tableB t3 WHERE t2.somekey = t3.somekey GROUP BY t3.somekey But how to do this? UPDATE tableA t1 SET speed = ( SELECT t2.value + sum(t3.value) FROM tableA t2, tableB t3 WHERE t2.somekey = t3.somekey AND t1.somekey = t3.somekey GROUP BY t3.somekey ) ; MySQL says it's illegal since you can't specify target table t1 for update in FROM clause.

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• How can I LIMIT rows updates in MySQL if more than one table is involved?

  - by Taz

  I am trying to run an UPDATE query UPDATE ner.nerdataset, ner.shortabstracts SET ner.nerdataset.ShortAbstract=ner.shortabstracts.ShortAbstract WHERE ner.shortabstracts.Resource=ner.nerdataset.ResourceURI LIMIT 10; As MySQL does not allow the use of LIMIT when more than one table is involved in UPDATE what else can be done to limit this?

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• MySQL name LIKE '%#attributes.q#%' --- Doesn't return result for an exact match?

  - by nobosh

  I have the following MySQL query: SELECT * FROM customer WHERE fName LIKE '%#attributes.q#%' AND deleted = 'N' OR lName LIKE '%#attributes.q#%' AND deleted = 'N' This works fine for guesses, but if you provide an exact match: "Bill Clinton" fname=bill lname = clinton to the query above you get 0 results? How can this query be updated to say find LIKE result and EQUAL TO results?

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• How I can Optimize this mySQL transaction within java code?

  - by worldpython

  Dear All, I am new to MySql database. I've large table(ID,...). I select ID frequently with java code and.And that make a heavy load on transaction select from tableName where ID=someID notes: 1.Database could be 100,000 records 2.I can't cache result 3.ID is a primary key 4.I try to optimize time needed to return result from query. Any ideas for optimization ? thanks in advance

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• Can I put an mysql index on a date field with when I use >= or <=?

  - by Ryan Detzel

  I have indexes for my table user,date, and date,user but when I issue queries like SELECT * FROM table WHERE date >= '2010-5-1' and user='test'; It doesn't use the date,user index it uses the user index. Is there any way to get mysql to use the date,user index for these queries?

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• how to connect asp.net Crystal report with mysql.

  - by Ayyappan.Anbalagan

  how to connect asp.net Crystal report with mysql database. like sql server database connection .is there any connector available to do this..

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• How to make phpMyAdmin ask for my username and password

  - by anitha

  I am using rhel 5 and php 5 with mysql 5. My server is already configured and running all applications smoothly. I am accessing mysql as root and supplying my password. However, when I access phpmyadmin through browser, it is not asking for my password. Somebody please tell me how can I set it to prompt for username and password. Since I am not familiar with php and mysql please tell me how to do it in simple way.

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• Is there a way to make Linq to Entities map unrecognized methods/functions to MySql functions?

  - by Luiscencio

  Is there a way to make Linq to Entities map unrecognized methods/functions to MySql functions? I want to add support to some functions like Convert.*

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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 to extend a file definition from an existing module in the node?

  - by c33s

  I use an older version of the example42 mysql module, which defines the mysql.conf file but not its content. Mmy goal is to just include the mysql module and add a content definition in the node. class mysql { ... file { "mysql.conf": path => "${mysql::params::configfile}", mode => "${mysql::params::configfile_mode}", owner => "${mysql::params::configfile_owner}", group => "${mysql::params::configfile_group}", ensure => present, require => Package["mysql"], notify => Service["mysql"], } ... } node xyz { include mysql File["mysql.conf"] { content => template("mymodule/mysql.conf.erb")} } The above code produces a "Only subclasses can override parameters" What is the correct way to just add a content definition to an existing file definition?

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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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• 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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• In MySQL, if the movies table has a description field, how to do search on this description?

  - by Jian Lin

  Say, using MySQL, if the movies table has 20,000 records, and each record has a field that is the description of the movie, up to 2k byte long. How can we search for movies with the word "nature" in its description? If possible, it is to be fast, instead of going through all the 20,000 records. (if in some other situations, like for books, where n can be 200,000 or more).

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• Can MySQL do row level security or what Oracle calls virtual private databases?

  - by JavaRocky

  Does MySQL have any equivalent feature to Oracle's virtual private databases in 10g. It is also known as row level security. I prefer not to implement anything like columns and triggers. I am looking for a solution similar to Oracle's.

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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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• 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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• Ruby, MySQL: Connection pool that is outside of the rails framework?

  - by Zombies

  Is there a ruby gem or such for MySQL connection pooling that isn't part of rails? I simply have a ruby script (again, I don't do anything with rails).

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• Zend framework : how to extract a column from mysql result set?

  - by understack

  What would be the best way to extract a column out of mysql results set? My result set is like: [0] = ('id'=>1, 'name'=>a), [1] = ('id'=>2, 'name'=>b), [2] = ('id'=>3, 'name'=>c) How can I extract 'name' column as an array from this? I can do it using for loop. But wondering if there are any better reusable solution?

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• How to keep backup of our database in MySql.

  - by Sanjeev

  I want to keep backup of my database and import it into different System? and how to make .dmp or store file in MySql?

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• Can I lock tables in an IF statement in MySQL?

  - by MalcomTucker

  This is throwing a syntax error - --from body of a stored proc IF (name = in_name) SET out_id = temp; ELSE LOCK TABLE People WRITE; INSERT INTO People (Name) VALUES (in_name); UNLOCK TABLE; SELECT LAST_INSERT_ID() INTO out_id END IF do I have to lock any tables I need at the start of the SP?

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• How can I connect to a mysql db from a different server ?

  - by HJ-INCPP

  Hello, I have, let's say, a root website with mysql db on a remote server. I want to connect to that particular database (to make queries), from many other little websites (with lower priviledges). Can this be done? Language: jsp,java,php Thank you

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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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• Delete record in MySQL with php targeting auto_incremented int?

  - by Chris_45

  Why doesnt this delete work to delete the whole record: $query = 'DELETE FROM tblEvents WHERE index = $_GET["id"]'; $result = mysql_query($query, $db) or die(mysql_error($db)); Where index is variable of type int, auto_incremented in MySQL?

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