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• MySQL best usage in Tomcat?

  - by mabuzer

  Which one is better way of using MySQL in Tomcat : A) assign a DB connection for user as long as it's session is valid. [OR] B) open connection to DB, on every request come to server and when it's done close that. ?

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• Required help to Increase the performance of the MySQL query

  - by Joseph

  Hi all, I am using a following query in MySQl for fetching data from a table. Its taking too long because the conditional check within the aggregate function.Please help how to make it faster SELECT testcharfield ,SUM(IF (Type = 'pi',quantity, 0)) AS OB ,SUM(IF (Type = 'pe',quantity, 0)) AS CB FROM Table1 WHERE sequenceID = 6107 GROUP BY testcharfield

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• Export unicode data from mysql

  - by Nayn

  Hi Folks, I have some data in one of my mysql table stored as utf8. The data is some japanese text. I need to export it to excel. Could you tell how to do it? Exporting by SELECT ... INTO OUTFILE returns some plain text file. I'm not sure how to read it back in excel so that japanese character would show properly Thanks Nayn

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• Coldfusion 8 access to MySQL database without datasource

  - by proyb2

  My webhosting doesn't allow us to access and modify the datasource, but having CF8, anyone have done access to mysql before? Do I need to use PHP?

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• Large PHP arrays or MySQL temporary memory tables?

  - by Mads Jensen

  How would you temporarily store several thousands key => value or key => array pairs within a single process. Lookups on key will be done continuously within the process, and the data is discarded when the process ends. Should i use arrays? temporary MySQL tables? Or something in between?

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• Which global variable of mysql are equivalent of Sql Server

  - by Shantanu Gupta

  I am looking for few global variable in mysql which are equivalent of sql server. I want the whole list eg. Sql Server Equivalent @@error --- @@Identity --- etc. Basically right now I want to know what are the equivalent variable of @@error and @@identity. But it will be helpfull if u could provide some other variable also

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• Upload Excel or CSV file to MySQL with PHP

  - by Tony

  I'm looking to allow users to upload an Excel or CSV file to MySQL for a contact management system. Need to be able to allow users to map their columns so that they are imported into the correct column in the table. Anyone know of a good site or tutorial on this?

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• MySQL Select names with last names starting with certain letter

  - by Brian

  I have a MySQL database with a field Name which contains full names. To select all people with last names starting with a particular letter, let's say A for this example, I use the following query: SELECT * FROM db WHERE Name LIKE '% A%'. However, this also selects users who have a middle name starting with A. Is there anyway to alter this query so that only a last name starting in A will be selected?

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• simpledb, sql azure, mysql + memcached

  - by sirmak

  For a new scalable high traffic global ecommerce website (asp.net) project which technology fits best (max. scalability & performance, min. price & maintenance)? amazon simpledb, microsoft sql azure, mysql + memcached combo, or your solution...

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• MySql query taking too long - django on webfaction

  - by fallhunter

  I use django on webfaction, and I've got a "MySql query taking too long" message, the sql is SELECT (1) AS `a` FROM `main_userprofile` WHERE `main_userprofile`.`id` = 98 This is a rather simple sql, why the query taken too long?

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• mysql5.58 unstart server in mac os 10.6.5

  - by EdwardLau

  MySQL 5.5.8 uninstall MAC OS 10.6.5,restart computer is message “/Library/StartupItems/MySQLCOM” has not been started because it does not have the proper security settings. i set sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit /usr/local/mysql/support-files/mysql.server Locate the configuration defining the basedir and set the following : basedir=/usr/local/mysql datadir=/usr/local/mysql/data bug i click the mysql preference start mysql server isn't start and i sudo chown -R root:wheel /Library/StartupItems/MySQLCOM and restart again ,not warning message but mysql server not start ,why?

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• can we use join inside join in mysql?

  - by I Like PHP

  i have 3 tables structure is below tbl_login login_id | login_name 1 | keshav tbl_role role_id | login_id( refer to tbl_login.login_id) 1 | 1 tbl_stuff stuff_id | role_id( refer to tbl_role.role_id) 1 | 1 i need data in follow format stuff_id | login_name 1 | keshav how to use JOIN to retrive the above data in mysql?

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• How to insert Search Query into MYSQL - Check for Double Words

  - by elmaso

  Hi, what is the best method to insert a search query into MySql and check for double words? (for showing up the last searches and a collection of searches)

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• Remote MySQL in AIR

  - by YourComputerHelpZ

  I use Aptana Studio 2.0 to create an Adobe AIR 2.0 webapplication. I have to contact my MySQL database from my server to be able to use my application. I tried, but it failed. Does AIR have these abilities anyways, and how? If not, what are the alternatives?

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• minus value in mysql table not worked

  - by Richa Media and services

  in my mysql table i want to use minus value. if i do 0 -1 = -1 but he work as 0 -1 = 2147483647 what i do for it.

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• Log all queries in mysql

  - by public static

  Hi, Is it possible for me to turn on audit logging on my mysql database? I basically want to monitor all queries for an hour, and dump the log to a file.

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• MySQL - query to return CSV in a field?

  - by StackOverflowNewbie

  Assume I have the following tables: TABLE: foo - foo_id (PK) TABLE: tag - tag_id (PK) - name TABLE: foo_tag - foo_tag_id (PK) - foo_id (FK) - tag_id (FK) How do I query this so that I get a result like this: ========================== | foo_id | tags | ========================== | 1 | foo, bar | | 2 | foo | | 3 | bar | -------------------------- Basically, I need all of foo's tags in one column, comma separated. Possible in MySQL?

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• PHP code to convert a MySQL query to CSV

  - by Reilly

  What is the most efficient way to convert a MySQL query to CSV in PHP please? It would be best to avoid temp files as this reduces portability (dir paths and setting file-system permissions required). The CSV should also include one top line of field names. Cheers.

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• Inserting database structure into MySQL with PHP?

  - by Andreas Carlbom

  Yo. I'm trying to find a way to insert a whole database structure into MySQL with PHP. Now, my main question is if there's any way to do this beyond just inserting the whole bloody thing line by line? Thanks.

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• Start for mysql Query PHP

  - by Belgin Fish

  Hi, I'm currently looking to have a mysql query retrieve data and have and a start and limit. So like, select * from table where x = x START AT ID X LIMIT X thanks :)

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• MySQL query String contains

  - by arik-so

  Hello. This may sound easy, but I've been trying - in vain, apparently - to figure out how I can make a query with MySQL that checks if the value (string $haystack ;) ) in a certain column contains certain data ( $needle ;) ), like this: mysql_query(" SELECT * FROM `table` WHERE `column`.contains('{$needle}') "); In PHP, the function is called substr($haystack, $needle), so maybe: WHERE substr(`column`, '{$needle}')=1 Thanks in advance!

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• need a good frontend for MySQL for beginner user

  - by aadersh patel

  implementing a database and need an easy to use frontend. Have tried: HeidiSQL - editing fields was very tedious MySQL-Front - wasnt adding tables through the SQL Editior, and only updated when the prog was restarted. Can anyone recommend a Frontend which they think would be appropriate? Many thanks

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• MySQL: Which is faster — INSTR or LIKE?

  - by Grekker

  If your goal is to test if a string exists in a MySQL column (of type 'varchar', 'text', 'blob', etc) which of the following is faster / more efficient / better to use, and why? Or, is there some other method that tops either of these? INSTR( columnname, 'mystring' ) > 0 vs columnname LIKE '%mystring%'

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• Reorganizing MySQL table to multiple rows by timestamp.

  - by Ben Burleson

  OK MySQL Wizards: I have a table of position data from multiple probes defined as follows: +----------+----------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------+----------+------+-----+---------+-------+ | time | datetime | NO | | NULL | | | probe_id | char(3) | NO | | NULL | | | position | float | NO | | NULL | | +----------+----------+------+-----+---------+-------+ A simple select outputs something like this: +---------------------+----------+----------+ | time | probe_id | position | +---------------------+----------+----------+ | 2010-05-05 14:16:42 | 00A | 0.0045 | | 2010-05-05 14:16:42 | 00B | 0.0005 | | 2010-05-05 14:16:42 | 00C | 0.002 | | 2010-05-05 14:16:42 | 01A | 0 | | 2010-05-05 14:16:42 | 01B | 0.001 | | 2010-05-05 14:16:42 | 01C | 0.0025 | | 2010-05-05 14:16:43 | 00A | 0.0045 | | 2010-05-05 14:16:43 | 00B | 0.0005 | | 2010-05-05 14:16:43 | 00C | 0.002 | | 2010-05-05 14:16:43 | 01A | 0 | | . | . | . | | . | . | . | | . | . | . | +---------------------+----------+----------+ However, I'd like to output something like this: +---------------------+--------+--------+-------+-----+-------+--------+ | time | 00A | 00B | 00C | 01A | 01B | 01C | +---------------------+--------+--------+-------+-----+-------+--------+ | 2010-05-05 14:16:42 | 0.0045 | 0.0005 | 0.002 | 0 | 0.001 | 0.0025 | | 2010-05-05 14:16:43 | 0.0045 | 0.0005 | 0.002 | 0 | 0.001 | 0.0025 | | 2010-05-05 14:16:44 | 0.0045 | 0.0005 | 0.002 | 0 | 0.001 | 0.0025 | | 2010-05-05 14:16:45 | 0.0045 | 0.0005 | 0.002 | 0 | 0.001 | 0.0025 | | 2010-05-05 14:16:46 | 0.0045 | 0.0005 | 0.002 | 0 | 0.001 | 0.0025 | | 2010-05-05 14:16:47 | 0.0045 | 0.0005 | 0.002 | 0 | 0.001 | 0.0025 | | . | . | . | . | . | . | . | | . | . | . | . | . | . | . | | . | . | . | . | . | . | . | +---------------------+--------+--------+-------+-----+-------+--------+ Ideally, the different probe position columns are dynamically generated based on data in the table. Is this possible, or am I pulling my hair out for nothing? I've tried GROUP BY time with GROUP_CONCAT that roughly gets the data out, but I can't separate that output into probe_id columns. mysql SELECT time, GROUP_CONCAT(probe_id), GROUP_CONCAT(position) FROM MG41 GROUP BY time LIMIT 10; +---------------------+-------------------------+------------------------------------+ | time | GROUP_CONCAT(probe_id) | GROUP_CONCAT(position) | +---------------------+-------------------------+------------------------------------+ | 2010-05-05 14:16:42 | 00A,00B,00C,01A,01B,01C | 0.0045,0.0005,0.002,0,0.001,0.0025 | | 2010-05-05 14:16:43 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | | 2010-05-05 14:16:44 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | | 2010-05-05 14:16:45 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | | 2010-05-05 14:16:46 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | | 2010-05-05 14:16:47 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | | 2010-05-05 14:16:48 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | | 2010-05-05 14:16:49 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | | 2010-05-05 14:16:50 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | | 2010-05-05 14:16:51 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | +---------------------+-------------------------+------------------------------------+

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• ADO.NET Data Services for MySQL

  - by Shalan

  Hey! I've searched high and low for this, and no luck. Is there a way that CRUD methods for a MySQL install (Linux box) be exposed via ADO.NET WCF Data Services? I would really love to leverage this in my WPF app :) Thank u!

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