Nabble - MySQL

Can MySQL 5 fully support XA transactions?

2008-12-03T12:33:21Z

I am trying to use XA transactions with a MySQL database using Spring, Hibernate, OpenMQ, and Atomikos and there is apparently an insufficiency in the XA DataSource implementation (due to this http://dev.mysql.com/doc/refman/5.0/en/xa-restrictions.html) which prevents resumes from completing successfully.

See thisa thread for more information as far as error stack traces and configuration details: http://fogbugz.atomikos.com/default.asp?community.6.360.2

Can I use MySQL for XA transactions in this manner, or would using another approach (different TransactionManager, etc.) be a better idea?

I will eventually deploy in Glassfish, so should I try using the Glassfish JTA TransactionManager and hope that it works a little better with the MySQL XA Driver?

Thanks in advance for any suggestions.

--James

From forum: MySQL - Java

unique constraint with 4 columns

2008-12-02T09:24:16Z

Hi,
Is it common to create unique constraints that consist of 4 columns? Can this result performance issues?
Thank you!

From forum: MySQL - General

Best Practices on Dump and Load

2008-11-28T10:52:14Z

Does anyone have a set of best practices they would share related to Dump and Load?

We have had some problems arise when taking a dump from a developer instance of the database and loading it on another, but not consistently.

I am particularly interested in its use to migrate schemas along with test data from Dev to Build to QA to Staging and into Production.

We have some that favor the use of Dump and Load ONLY for initial setup of a DB instance and use Patch files from then on, while others think Dump and Load is ok for schema changes as well.

Interested in the community opinion on these choices and / or those Best Practices.

Ollie

From forum: MySQL - Community

Optimising query question, EXPLAIN SELECT ...

2008-11-25T11:30:11Z

Hi,

I am pretty new in optimizing tables with idnex and may need some help.
This is my query:

EXPLAIN SELECT timestamp
FROM Meting_INT_COPY
WHERE blockid = '200811252000'
ORDER BY timestamp DESC
LIMIT 1

If I have an index(blockid),
EXPLAIN will return the following information:

type possible_keys key rows Extra
ref index_blockid index_blockid 2638 Using where; Using filesort

If I add an index(blockid,timestamp)
EXPLAIN will display the following:

type possible_keys key rows Extra
ref index_blockid,index_blockid_timestamp index_blockid_timestamp 8248 Using where; Using index

Why for the index(blockid) 2638 rows are returned and for a more specific index(blockid,timestamp) 8248 rows are returned ?

Thank you for any answer !

From forum: MySQL - General

auto_increment field

2008-11-23T03:35:45Z

I want to use value of auto_increment column and combine it with an string and save it.
Is there any solution in that i don't mark any column as auto_increment but use the value of it when inserting a new row.

From forum: MySQL - General

RE: MS Access

2008-11-19T06:21:54Z

I have finally solved my problem.

'ODBC' needs to be inserted into the connection string.

My cfinal onnections string is:
LINK_MYSQL = "ODBC; DRIVER={MySQL ODBC 3.51 Driver};
Server=http://www.###.co.uk; UID=###;PWD=###;Option=16387;database=###"

From forum: MySQL - ODBC

Re: Index or trigger

2008-11-19T02:49:37Z

Go for the index

See example below
nha khoa
gia cong nhua
nhua
gia cong chi tiet
khuon mau
thiet ke web
do dung cho be

From forum: MySQL - General

Index or trigger

2008-11-19T02:48:34Z

I have about 30 look up tables which contain the options for various values to be displayed to the users. Those tables will have lot of SELECT queries but very few INSERT or UPDATE queries.
That being the case, am i better off having a unique index on the options or have a 'before-insert' trigger for that table which checks for unique values?

From forum: MySQL - General

Select top three results from different catagories

2008-11-12T22:00:40Z

I post detail at Software nha khoa Group
I cannot seem to get this to work. I have a table full of hockey teams records that I need to get the top three teams based on points but each team of the top three has to be from a different division.

Here is an example:

Table: Teams

TEAM | POINTS | DIVISION
T#1 25 DIV#1
T#2 23 DIV#1
T#3 30 DIV#2
T#4 12 DIV#2
T#5 26 DIV#3
T#6 27 DIV#3

The result should look like this:
1. T#3
2. T#6
3. T#1

Not look like this:
1. T#3
2. T#6
3. T#5

Anybody have an idea what a select statement would look like for this?

Thanks is advance!

From forum: MySQL - General

Re: Sum with Join

2008-11-05T19:55:17Z

You should try this :

SELECT BirthMonth, sum(Age) as totalAge, sum(itemCount.cnt) AS numitems
FROM People
LEFT JOIN (SELECT person_id, count(*) AS cnt FROM Items GROUP BY person_id) AS itemCount ON People.ID = itemCount.person_id
WHERE People.Age > 10
GROUP BY BirthMonth

Bargain-Predator.com

From forum: MySQL - General

Training & jobs

2008-11-05T01:34:18Z

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(EAD, GC).
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Preferably (not mandatory) Master's Degree in Computers/
Electronics or previous IT experience.
Willing to relocate anywhere in USA.

What’s The Deal:
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Transfer of H1 & L1 visas.
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Contact person : John

From forum: MySQL - .NET

Training & jobs

2008-11-05T01:32:41Z

From forum: MySQL - General

Training & jobs

2008-11-05T01:31:44Z

From forum: MySQL - Java

Training & jobs

2008-11-05T01:30:27Z

From forum: MySQL - C++

Can't get a third table in MySQL database to work?

2008-10-29T01:10:08Z

I see the question on nha khoa Software group

This sounds mad, but I've created two tables in a MySQl database into which I can insert data via php pages and display the contents. I've created a third with the same structure, but it just doesn't work - the php pages are just blank and no information is being inserted. I've tried renaming the table, restructuring it, dropping it and starting again but it refuses to cooperate. It's as though MySQL KNOWS what I'm trying to do and is just being bloody-minded. Could there some sort of caching going on either at my sever or on my computer which is preventing me updating the database? Has this happened to anyone else?

More questions about Database are post here: support of nha khoa Software group

Any one can help them?

Thanks

From forum: MySQL - General

MySQL DBA Job Opportunity (100% Telecommute)

2008-10-21T12:45:37Z

Do you have at least 2-5+ years experience administering mission critical MySQL databases, including HA and replication (a MUST HAVE)? If you have this experience, please read the job description/requirements below carefully. If you are a fit and are interested, then please send me an updated resume that details this necessary experience (including your MySQL HA and redundancy experience) to al@equestsolutions.com and then I will call you to tell you all about the company, position and team.

If you are not a fit or are not interested, I was hoping you could help me out and refer me to any MySQL DBA’s or or PHP Developers that you have worked with or know of that would be interested in the following positions I have available. See below for detailed job descriptions. If you prefer, please visit www.equestsolutions.com for all open positions. Based on your outstanding experience, I would like to keep your resume and contact you when I come across something else you maybe interested in.

MySQL DBA
Location: Westlake Village or Irvine, CA or Telecommuting
Salary: $90-150K DOE

A profitable two year startup is looking for a MySQL DBA. The MySQL DBA will be responsible for the administration of 2 MySQL v5.0 databases in InnoDB mode running on RHES v4.x in production/QA/dev environments. Administration will include installation, configuration, monitoring, optimization, tuning, troubleshooting, backup, recovery and upgrades. Due to consistent growth, the company plans to increase the database environment from 2 MySQL Databases with 1 million rows/100 tables and 5gigs of data handling 5 txn/sec to 6-8 MySQL Databases with 100 million rows/200 tables and 200+ gigs of data handling 100 txn/sec. The MySQL DBA will also be responsible for designing, implementing and supporting a formal High Availability (HA) and Redundant solution, preferably based on DRBD (Distributed Raw Block Device). Furthermore, the MySQL DBA will be responsible for implementing a formal backup and recovery solution and process. DBA will also be responsible for optimizing schemas, queries and indexes, tuning for mission critical OO Perl applications, quickly diagnose database and server problems and employ preventive measures to maintain high availability servers and mentoring OO Perl software engineers to develop applications that interact with MySQL. Initially, position may not require 100% DBA work, thus, candidate, depending on background, may be asked to performing Linux systems administration, networking and/or Perl development.
Position reports to Director of Systems Operations

Company will send DBA to any specific MySQL training if needed.

REQUIREMENTS:
MUST HAVE 2-5+ yrs of MySQL DBA experience, with at least some experience in a 24X7 mission critical environment MUST HAVE experience implementing a MySQL HA and Redundant solution with MySQL DRBD (preferred), MySQL Cluster and/or MySQL Replication Experience optimizing and tuning high volume MySQL Databases Monitoring MySQL databases using Nagios, Cacti or any other open source tool Scripting to automate database administration functions (Perl, Python, PHP and/or shell)
Pluses:
Experience in InnoDB Mode
Experience performing Linux administration, networking and/or Perl development Experience with PostgreSQL Experience working within a NetApp environment

With your resume submittal, please answer the following
questions:

Are you a U.S. citizen or green card or EAD holder or H1 Visa holder?

Do you prefer a permanent or contract position?

What is your current base salary or contract rate (W-2 or 1099)?

What salary or contract range are you considering (please do not respond *negotiable* or similar).

Why did you leave your last 3 employers?

If you do not live in southern CA, are you able to relocate yourself for a permanent position?

From forum: MySQL - Community

Sum with Join

2008-10-10T08:51:09Z

Hi Everyone,

I'm trying to pull data out of two tables using a left join, while doing a sum on a column in the main table. However when the left join links to multiple records the sum is incorrect as duplicate rows are returned.

For example... here's a made-up data structure:

Table: People
ID, Name, Age, BirthMonth
1, John, 25, Jan
2, Fred, 72, Feb
3, Dave, 15, Jan

Table: Items
ID, person_id, itemname
1, 1, Wallet
2, 1, Spectacles
3, 3, Playstation

If I carry out the following query:

SELECT BirthMonth, sum(Age) as totalAge, count(Items.ID) AS numitems
FROM People
LEFT JOIN Items ON People.ID = Items.person_id
WHERE People.Age > 10
GROUP BY BirthMonth

It returns the following result:

BirthMonth, totalAge, numitems
Feb, 72, 0
Jan, 65, 3

... and John's age is counted twice because he has two Items.

If I try the following query, using a sub-query (something that I'm quite new to doing!):

SELECT BirthMonth, sum(Age) as totalAge,
(SELECT count(*) FROM Items WHERE person_id = People.ID) AS numitems
FROM People
WHERE People.Age > 10
GROUP BY BirthMonth

... then I get the following result:

BirthMonth, totalAge, numitems
Feb, 72, 0
Jan, 40, 2

... when numitems should be 3, but obviously that doesn't work because I'm using person_id in my sub-query.

Can anyone suggest how I should be going about this problem?

I'm running MySQL 5.0.51 and have included the data structure from my example below.

Any help or advice would be very much appreciated!

Regards

Simon

CREATE TABLE `Items` (
`ID` int(11) NOT NULL auto_increment,
`person_id` int(11) NOT NULL,
`itemname` varchar(50) NOT NULL,
PRIMARY KEY (`ID`)
);

INSERT INTO `Items` VALUES (1, 1, 'Wallet');
INSERT INTO `Items` VALUES (2, 1, 'Spectacles');
INSERT INTO `Items` VALUES (3, 3, 'Playstation');

CREATE TABLE `People` (
`ID` int(11) NOT NULL auto_increment,
`Name` varchar(25) NOT NULL,
`Age` int(11) NOT NULL,
`BirthMonth` varchar(10) NOT NULL,
PRIMARY KEY (`ID`)
);

INSERT INTO `People` VALUES (1, 'John', 25, 'Jan');
INSERT INTO `People` VALUES (2, 'Fred', 72, 'Feb');
INSERT INTO `People` VALUES (3, 'Dave', 15, 'Jan');

From forum: MySQL - General

how to count rows grouped by a date?

2008-10-10T02:12:47Z

hi,

i have red about Group by and Count and tried to count rows, which are created at a special Day

SELECT YEAR(mydate) AS year, MONTH(mydate) AS month, COUNT(*) AS '#edits' FROM mytable GROUP BY YEAR(mydate), MONTH(mydate), DAY(mydate)

but what i get, is wrong

year month #edits
2008 9 97
2008 9 15
2008 10 16
2008 10 2
2008 10 9

why it does show me same month twice?

From forum: MySQL - General

Training & jobs

2008-09-22T23:21:13Z

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What’s The Deal:
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Contact immediately to know more about the opportunities with us at:609-843-0312
or
write mail at jobs@v2techinc.com
Contact person : John

From forum: MySQL - General

Training & jobs

2008-09-22T23:19:40Z

“Join us to make future”
FOR OPT/F-1 STUDENTS
FREE TRAINING
FOOD ACCOMODATION
H1B PROCESSING FOR L1/ L2/ H1/ H4/ EAD/ GC
EXCELLENT OPPRTUNITIES
TRAINING
PLACEMENT
Highly Competitive offers for New H1b Transfers
About Us:
V2 technology inc is serving NJ since 2005, for us our employees are of utmost importance. Our highly skilled and dedicated instructors train you explicitly in market-related technologies for today and tomorrow. We will work with you in developing marketing strategies and finding the assignments of your choice.
We not only help you get a job but we build your long lasting careers!!!
What are we Looking for:
Excellent communication skills.
Valid F1/ OPT/ CPT/ H1/ H4/ L1 or valid work status (EAD, GC).
Bachelors’ degree in CS/ IT or previous IT experience.
Preferably (not mandatory) Master's Degree in Computers/ Electronics or previous IT experience.
Willing to relocate anywhere in USA.
What’s The Deal:
H1-B sponsorship to F1/ OPT/ H4/ L1/ L2/ E3/ EAD
Transfer of H1 & L1 visas.
Green Card sponsorship through PERM
Job focused professional training in
Java/ J2EE
.NET
Documentum
Share point
Oracle
Data Modeling
Relocation assistance- airfare, hotel accommodation, car rental etc
Guarantee lowest bench period.
Employee referral program.
Effective Resume writing help, Marketing and Placement.
Technical mock interviews. Preparation of In Person Interviews
100% Guaranteed placement
Get in Touch:
Contact immediately to know more about the opportunities with us at:609-843-0312
or
write mail at jobs@v2techinc.com
Contact person : John

From forum: MySQL - Community

Training & jobs

2008-09-22T23:18:15Z

“Join us to make future”
FOR OPT/F-1 STUDENTS
FREE TRAINING
FOOD ACCOMODATION
H1B PROCESSING FOR L1/ L2/ H1/ H4/ EAD/ GC
EXCELLENT OPPRTUNITIES
TRAINING
PLACEMENT
Highly Competitive offers for New H1b Transfers
About Us:
V2 technology inc is serving NJ since 2005, for us our employees are of utmost importance. Our highly skilled and dedicated instructors train you explicitly in market-related technologies for today and tomorrow. We will work with you in developing marketing strategies and finding the assignments of your choice.
We not only help you get a job but we build your long lasting careers!!!
What are we Looking for:
Excellent communication skills.
Valid F1/ OPT/ CPT/ H1/ H4/ L1 or valid work status (EAD, GC).
Bachelors’ degree in CS/ IT or previous IT experience.
Preferably (not mandatory) Master's Degree in Computers/ Electronics or previous IT experience.
Willing to relocate anywhere in USA.
What’s The Deal:
H1-B sponsorship to F1/ OPT/ H4/ L1/ L2/ E3/ EAD
Transfer of H1 & L1 visas.
Green Card sponsorship through PERM
Job focused professional training in
Java/ J2EE
.NET
Documentum
Share point
Oracle
Data Modeling
Relocation assistance- airfare, hotel accommodation, car rental etc
Guarantee lowest bench period.
Employee referral program.
Effective Resume writing help, Marketing and Placement.
Technical mock interviews. Preparation of In Person Interviews
100% Guaranteed placement
Get in Touch:
Contact immediately to know more about the opportunities with us at:609-843-0312
or
write mail at jobs@v2techinc.com
Contact person : John

From forum: MySQL - C++

Training & jobs

2008-09-22T23:16:51Z

“Join us to make future”
FOR OPT/F-1 STUDENTS
FREE TRAINING
FOOD ACCOMODATION
H1B PROCESSING FOR L1/ L2/ H1/ H4/ EAD/ GC
EXCELLENT OPPRTUNITIES
TRAINING
PLACEMENT
Highly Competitive offers for New H1b Transfers
About Us:
V2 technology inc is serving NJ since 2005, for us our employees are of utmost importance. Our highly skilled and dedicated instructors train you explicitly in market-related technologies for today and tomorrow. We will work with you in developing marketing strategies and finding the assignments of your choice.
We not only help you get a job but we build your long lasting careers!!!
What are we Looking for:
Excellent communication skills.
Valid F1/ OPT/ CPT/ H1/ H4/ L1 or valid work status (EAD, GC).
Bachelors’ degree in CS/ IT or previous IT experience.
Preferably (not mandatory) Master's Degree in Computers/ Electronics or previous IT experience.
Willing to relocate anywhere in USA.
What’s The Deal:
H1-B sponsorship to F1/ OPT/ H4/ L1/ L2/ E3/ EAD
Transfer of H1 & L1 visas.
Green Card sponsorship through PERM
Job focused professional training in
Java/ J2EE
.NET
Documentum
Share point
Oracle
Data Modeling
Relocation assistance- airfare, hotel accommodation, car rental etc
Guarantee lowest bench period.
Employee referral program.
Effective Resume writing help, Marketing and Placement.
Technical mock interviews. Preparation of In Person Interviews
100% Guaranteed placement
Get in Touch:
Contact immediately to know more about the opportunities with us at:609-843-0312
or
write mail at jobs@v2techinc.com
Contact person : John

From forum: MySQL - Java

Navicat for MySQL v.8.0.28 is now available

2008-09-19T00:16:23Z

PremiumSoft CyberTech Limited today announced the immediate availability of Navicat for MySQL v.8.0.28. This new version supports MySQL 5.1 new feature Scheduled Event, enabling users to set a schedule for any Event defined in MySQL. Navicat v.8.0.28 also allows Virtual Grouping which provides better categorization for objects. A significant change has also been made to the Form View, which now shows a clearer display of fieldname and its value with focus on current record.

Code Completion is introduced to this new version of Navicat which makes SQL scripting faster than before. In addition, users can now open profile on their desktop directly with the new Profile System. Enhanced Report Printing feature allows user to print report to PDF, HTML and more. Email can also be sent to notify the users upon the completion of the scheduled task.

Other enhancements include the compatibility with any MySQL server version up to 5.1.X, Incremental Search in Table View, usability enhancement in Table Design and many other improvements on features and user-friendliness.

More information on Navicat for MySQL is available online at http://www.navicat.com , or downloads a 30-day free trial at http://www.navicat.com/download.html

From forum: MySQL - GUI Tools

tt

2008-09-07T07:33:45Z

7861743_10372996.jpg

From forum: MySQL - General

Replication Master-Master, rebooting one of them

2008-08-27T07:44:48Z

Hi to you all,
as in the title, i've set up a replication system master-master. All works good but i need to reboot a machine. Can i do this operation safely and without risk??
thank you, regards
Paolo

From forum: MySQL - Replication

[JOB OPP] MySQL DBA (Location: Silicon Valley)

2008-08-25T17:45:56Z

BayTSP is seeking a talented DBA to manage the day to day operations of the MySQL Databases. This is an excellent opportunity for an experienced DBA or DB Developer who is looking for a new challenge and an opportunity for growth.

Responsibilities

* Oversee production databases and data warehouse systems within a fast-paced high availability 24/7 environment
* Manage MySQL database in production environment including installation, configuration, backup, and performance tuning
* Prepare project plans and report weekly on progress and deliverables
* Optimize the data structures to enhance data load times and end-user data access response times
* Responsible for automation in deployment/migration, monitoring and reporting
* Create and maintain internal processes to ensure data quality, availability and scalability

Requirements

* Solid DBA experience with 1+ yr of MySQL-related experience
* Strong scripting experience (e.g., perl, Python, shell, etc)
* Experience with Linux administration is a plus
* Ability to work in a team-oriented environment
* Comfortable working in a fast-paced environment and has a "can-do" attitude
* Excellent problem solving and troubleshooting skills
* Good communications skills
* Attention to detail
* Strong documentation proficiency

*** TO APPLY: to expedite the application process, please email your resume and cover letter to tracieg [AT] baytsp [DOT] com
*** 3rd party/agency resumes are *not* accepted.

About BayTSP
-------------------
Founded in 1999, BayTSP offers a revolutionary way for digital content owners to track down their valuable online property, in order to effectively deter its theft and misuse. Our company has designed an entire suite of proprietary file branding and tracking applications. BayTSP provides online copyright monitoring and enforcement services for the entertainment industry, software and videogame makers and the publishing industry. Our headquarters is located in Los, Gatos, CA.

From forum: MySQL - Community

How to evaluate my SQL database design?

2008-08-20T05:17:54Z

Actually I'm searching for an answer to the question...When I design a database using SQL..how can I evaluate this design? how can I judge that my design is better than other people design (specially when I'm writting a paper that compare my design to the Hippocratic design)?

I'd be very grateful if any one could help me in this question.. Thank you in advance

From forum: MySQL - General

Missing tables. Rebuilding

2008-08-13T19:13:11Z

For some inscrutable God design some tables have disappeared leaving only the .frm file, and as as a good boob newb I do not have the latest tables creation routine. Are the .frm files of any use to recreate the tables?

Also: I have a "c:\MySql Datafiles\ibdata1" with a date that could correspond to the latest I have used the database. There is no file ext. What is it? Could it help?

Please bear with me. Thanks for the help.

From forum: MySQL - General

How to run this SQL query - Ignore my previous post

2008-08-07T22:21:35Z

Friends,

I have a legacy table of this form:

Time ValueType Value
0:00 A 1
0:00 B 2
1:00 A 11
1:00 B 22

It is not very well designed since each batch of value A and B are always sampled as the same time (0:00, then 1:00).

How can I run a query to return a result like this?

Time Value (for ValueType A) Value For (ValueType B)
0:00 1 2
1:00 11 22

Many thanks in advance!
Toutiao

From forum: MySQL - General

Re: How to run this SQL query

2008-08-07T22:19:38Z

See if I can get the format right this time:

toutiao wrote:

Friends,

I have a legacy table of this form:

Time ValueType Value
0:00 A 1
0:00 B 2
1:00 A 11
1:00 B 22

It is not very well designed since each batch of value A and B are always sampled as the same time (0:00, then 1:00).

How can I run a query to return a result like this?

Time Value (for ValueType A) Value For (ValueType B)
0:00 1 2
1:00 11 22

Many thanks in advance!
Toutiao

From forum: MySQL - General

How to run this SQL query

2008-08-07T22:17:21Z

Friends, I have a legacy table of this form: Time ValueType Value 0:00 A 1 0:00 B 2 1:00 A 11 1:00 B 22 It is not very well designed since each batch of value A and B are always sampled as the same time (0:00, then 1:00). How can I run a query to return a result like this? Time Value (for ValueType A) Value For (ValueType B) 0:00 1 2 1:00 11 22 Many thanks in advance! Toutiao

From forum: MySQL - General

Re: MySQL JDBC + prepared statements -> plain SQL in log

2008-07-25T02:27:09Z

Try with these params in your connection URL:

useServerPrepStmts=true (default is false)
emulateUnsupportedPstmts=false (default is true)

and your log will show this:

3 Prepare [2] SELECT * FROM users WHERE SourceId=?
3 Prepare [3] INSERT INTO users (UserId,FirstName,MiddleInitial,LastName,...) VALUES (?,?,?,?,...)

3 Execute [2] SELECT * FROM users WHERE SourceId='25768F9388DC834EC12570ED00578668'
3 Execute [3] INSERT INTO users (UserId,FirstName,MiddleInitial,LastName,...) VALUES ('33',...)

see also here: http://dev.mysql.com/doc/refman/5.0/en/cj-news-5-0-5.html

robs

From forum: MySQL - Java

Auto SQL generation during Update requires a valid SelectCommand.

2008-07-22T22:34:24Z

Hello,

I am trying to develop a simple C# application that communicates with a MySQL database. My code works fine on Windows under Visual Web Developer 2005 and had been working on Mono 1.9.1 on Centos 5 until this error.

When I access a page that is calling MySqlDataAdapter.Update() I get the following error:

==============================================================
Server Error in '/' Application
Auto SQL generation during Update requires a valid SelectCommand.

Description: HTTP 500. Error processing request.

Stack Trace:

System.InvalidOperationException: Auto SQL generation during Update requires a valid SelectCommand.
at System.Data.Common.DbDataAdapter.Update (System.Data.DataRow[] dataRows, System.Data.Common.DataTableMapping tableMapping) [0x00000]

Version information: Mono Version: 2.0.50727.42; ASP.NET Version: 2.0.50727.42

============================================================

Here is an example of my code. It is calling a wrapper around the database.

============================================================

using System;
using System.Data;
using System.Web.UI;
using System.Web.UI.WebControls;

public class DataNames : System.Web.UI.Page
{
// The output will be dumped to a Literal called pageText
protected Literal pageText;

// This method is called whenever the page is viewed
protected void Page_Load(object sender, EventArgs e)
{
// Create a DataTable with the "member" table
// Cobra.Data is defined in Cobra.Database.cs (below)
Cobra.Data memberData =
new Cobra.Data("member");

// Load plan members into a DataTable
DataTable memberTable = memberData.DataTable();

// loop thru the DataTable to do something useful
foreach ( DataRow Member in memberTable.Rows )
{
string tempString =
String.Format("Member #{0} is {1} {2} \n",
Member["MemberID"],
Member["FirstName"],
Member["LastName"]);
pageText.Text += tempString;
}

DataRow aRow = memberData.FilterRow("MemberID = 89");
aRow["LastName"] = "Malcolm";

// *********** This is the offending code **************
// *********** The class is defined below **************
memberData.Save();

pageText.Text += memberData.SC() + " \n";
pageText.Text += memberData.IC() + " \n";
pageText.Text += memberData.DC() + " \n";
pageText.Text += memberData.UC() + " \n";

// Output the number of rows to pageText
pageText.Text +=
String.Format("There are {0} rows in total",
memberTable.Rows.Count);

DataSet dataSet = memberData.DataSet();

string xml = Server.HtmlEncode(dataSet.GetXml());

pageText.Text += xml;

} // End of Page_Load()
} // End of NetNames class

=================================================================

Here is the class that is being invoked when new Cobra.Data("member") and Cobra.Data.Save() above:

================================================================

using System;
using System.Data;
using MySql.Data.MySqlClient;

namespace Cobra {
public class Data
{
private MySqlConnection database;
private MySqlDataAdapter adapter;
private DataSet data;
private string setName;

public Data (string sql, string name)
{
BuildData(sql, name);
}

public Data (string name)
{
string sql = "select * from " + name + ";";

BuildData(sql, name);
}

private void BuildData (string sql, string setTitle)
{
// Store the name of this DataSet
setName = setTitle;

// What credentials will be passed to the database
string connectionString =
"Server=localhost;" +
"Database=agencydb;" +
"User ID=healthuser;" +
"Password=health;" +
"Pooling=false";

// Create a connection to the database
database = new MySqlConnection(connectionString);

// Create an IDataAdapter to link to the database
adapter = new MySqlDataAdapter();
adapter.SelectCommand = new MySqlCommand(sql, database);

// Automagically build insert, update, delete queries
MySqlCommandBuilder theBuilder =
new MySqlCommandBuilder(adapter);

// Create a DataSet to hold the data
data = new DataSet();

database.Open();

// Populate data
adapter.Fill(data, setName);

database.Close();
}

public string SC()
{
string theString;

IDbCommand command = adapter.SelectCommand;

if (command == null)
{
theString = "Nothing";
}
else
{
theString = command.CommandText;
}

return theString;
}

public string IC()
{
string theString;

IDbCommand command = adapter.InsertCommand;

if (command == null)
{
theString = "Nothing";
}
else
{
theString = command.CommandText;
}

return theString;
}

public string DC()
{
string theString;

IDbCommand command = adapter.DeleteCommand;

if (command == null)
{
theString = "Nothing";
}
else
{
theString = command.CommandText;
}

return theString;
}

public string UC()
{
string theString;

IDbCommand command = adapter.UpdateCommand;

if (command == null)
{
theString = "Nothing";
}
else
{
theString = command.CommandText;
}

return theString;
}

public DataSet DataSet ()
{
return data;
}

public DataTable DataTable ()
{
return data.Tables[0];
}

public DataRow FilterRow (string filter)
{
DataView theView = new DataView (data.Tables[0]);

theView.RowFilter = filter;

DataRow theRow = (DataRow) theView[0].Row;

return theRow;
}

public void Save ()
{
// database.Open();

// Save the changes to the database
adapter.Update( data, setName );

// database.Close();
}
} // End of class Data

} // End of namespace Cobra

===========================================================

I am using the Managed Connector for MySQL. I had the same results using 5.2.2 and an earlier 5.0 version.

I am pre-compiling Cobra.Database into a DLL using gmcs under Mono.

The results are the same regardless of whether the MySqlConnection is open or closed. Also, it does not seem to matter if I do the MySqlCommandBuilder in Save() or elsewhere.

As I said, it works great under .NET/Windows and the data underneath is really updated the way it should be.

I left in the SC(), DC(), IC(), and UC() methods as I thought they might also be interesting.

If I take out the call to Save() the whole page renders fine on both Mono/Linux and .NET/Windows and I see the output of these methods

SC() returns "select * from member" but the rest all return "Nothing" which means that the equivalent commands in MySqlDataAdapter are null. This is also the output I get under .NET/Windows when it writes the changes to the database correctly.

Any ideas on where this error is coming from and how I can get rid of it?

Alternatively, can anybody point me at a good tutorial for building the queries directly instead of relying on MySqlCommandBuilder?

Thank you.

Justin

From forum: MySQL - .NET

RE: Mysql server has gone away error

2008-07-18T22:47:58Z

-----Original Message-----
From: geniekids [mailto:geniekids@gmail.com]
Sent: 05 June 2008 06:35
To: myodbc@lists.mysql.com
Subject: Mysql server has gone away error
Hi
I have a mysql database on my web server and an MS Access (2002) frontend on
my desktop. I am using ODBC 5.1 to connect the access frontend to the mysql
database. However i keep getting this error almost every few minutes
QUOTE:
ODBC call failed
[MYSQL][ODBC MYSQL 5.1 Driver][mysqld-5.0.45-community]Mysql server has gone
away (#2006)
UNQUOTE
Once this error comes i need to close the ms access and open it again - it
works for few minutes and then the same error.
Any help will be really appreciated.

Geniekids:
I too had been struggling with this (or at least a very similar problem) for a week. I too am a newbie. The problem is with the timout setting and can be solved within the DSN.

1) I'm using MSAccess Offic 2003 as a front end.
2) MYSQL database is on a remote host. It's a 4.0, not 5.0, if that matters.
3) I first installed the the appropriate ODBC 3.5.1 driver for MySQL. You can download it from the URL:
http://www.mysql.com/products/connector/odbc/
4) Once this driver is in place you can then create a DSN connection to the MYSQL Server. (Start>programs>administrative tools>Data Sources (OBDC)>Add> and find your new MYSQL Driver). You must then know its IP address, your username and password for the MYSQL database. But, there's a key setting you must make when creating the DSN. (Or you can edit the existing one. See Solution below.)

All this allowed me to establish a linked table in MSAccess (with your .mdb open and looking at the Tables tab, use File>Get External Data>Linked Table>ODBC Database ()" [i.e. the file type] and then use your newly configured DSN for the MYSQL database and select the table you want.

Cool. I could open Access and the linked table would be there just fine. I could open the table, view its content, edit fields, create forms with data linked to the table, etc. BUT, WITHOUT THE SOLUTION BELOW if I let it sit for 100 secs, it would basically time out and I'd get the message you got and have to close Access and then it would be linked again.

SOLUTION: To solve my 100 second timeout problem, when creating the the DSN connection (I did a USER connection, not a SYSTEM connection), look at the "Connect Options" tab. In the "Initial Statement" box type "Set wait_timeout=28800" (without the quotes). Apparently that is in seconds so 28800 would be a long time. But since we have very, very few people hitting this database, I don't think it will cause any problems.

If you've already created the DSN connection, use the ODBC manager (Start>programs>administrative tools>Data Sources (OBDC). Highlight the DSN you created and then Configure>Connect Options Tab and supply the above initial statement.

By the way, if you've already created the hot-linked table in Access, you'll have to delete it and recreate the linked table (File>Get External Data>Linked Table>ODBC Database ()" [i.e. the file type] and then use your newly configured DSN to establish it again. The new initial timeout setting (for whatever value you set it at) will then be set in the linked table. Just changing the DSN won't flow the new timeout unless you re-link the table, thus picking up the net setting.

If you haven't found it, the following link is a good primer for Access front-end and MYSQL backend.
http://www.aspfree.com/c/a/Microsoft-Access/An-Access-Front-End-to-MySQL/

From forum: MySQL - ODBC

MySQL DBA Position San Diego, CA

2008-07-18T15:13:07Z

Position : MySQL Database Administrator
Type: Contract
Duration : 5-6 months (possibly will get extended beyond that)
Rate : $70-75/hr
Location: San Diego, CA (92121)

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• Two to three years experience supporting MySQL in a Linux/Unix environment
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• Methods and tools for rapidly exporting and importing to and from MySQL databases.
• Actively administered more than 10 production MySQL 5.0 servers in a high-traffic and distributed OLTP environment, with a mix of masters and slaves replication.
• Have written moderately complex Linux/Unix shell scripts utilizing bult-in shell variables, regular expressions, conditional expressions, functions.
• Working knowledge of Linux/Unix tools such as vi, su, ssh, bash/ksh/csh, perl/awk, snmp/monitoring, crontab, kickstart/netboot
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From forum: MySQL - Community