Enhanced LINQ to SQL Compatible ORM Solution from Devart
Devart Email: i...@devart.com Web: http://www.devart.com FOR IMMEDIATE RELEASE CONTACT INFORMATION: Julia Samarska jul...@devart.com 11-Jun-2010 Enhanced LINQ to SQL Compatible ORM Solution from Devart Devart has recently announced the release of LinqConnect - an enhanced LINQ to SQL compatible ORM solution with extended functionality, support for SQL Server, Oracle, MySQL, PostgreSQL, and SQLite, its own visual model designer, seamlessly integrating to Visual Studio, and SQL monitoring tool. LinqConnect allows you to quickly create mapping model and generate data access layer code for your application, greatly decreasing development time and eliminating the need to work over routine tasks. It was developed closely to the Microsoft LINQ to SQL technology, while extending its functionality, thus allowing LINQ to SQL developer to easily get started with LinqConnect. In addition to LINQ to SQL features, LinqConnect provides its own advanced functionality. LinqConnect has complete support for complex types, allowing you to create entity properties with internal structure. With ID Generation feature you may just set an attribute for the property to use unique value generation for it. LinqConnect caches compiled queries automatically, while allowing you to set cache parameters and control caching process. This is just a part of LinqConnect unique features. LinqConnect supports SQL Server, Oracle, MySQL, PostgreSQL, and SQLite. It provides the same interface to all database servers, allowing you to easily develop applications that are able to use different databases. Please, feel free to download, try and write any comments or suggestions about our products! Pricing and Availability A Single license costs $249.95. To learn more, download trial edition, or order a license please visit the Devart site: www.devart.com/linqconnect/. About Devart Devart is a software development company with 11 years of experience on the software market and over 20 thousands of devoted users. We specialize in providing native connectivity solutions as well as comprehensive development and management tools for the most popular databases, including Oracle, SQL Server, MySQL, PostgreSQL, InterBase, Firebird, and SQLite. For additional information about Devart, visit www.devart.com/company/. # # # EVALUATION COPY AVAILABLE ON REQUEST
int(10) va int(11)
Assume MySQL int range (unsigned) is from 0 to 4294967295 There are total 10 digits. Why a lot of tutorial in the web tell you to declare, e.g. CREATE TABLE t1 (f INT(11) UNSIGNED); -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: int(10) va int(11)
11 characters of display allow for any int of any size, signed or unsigned. When you do not specify a length attribute in a declaration, MySQL uses 11 as the default. For your application, use what makes sense for your problem's domain. - michael dykman On Mon, Jun 14, 2010 at 12:14 PM, Ryan Chan ryanchan...@gmail.com wrote: Assume MySQL int range (unsigned) is from 0 to 4294967295 There are total 10 digits. Why a lot of tutorial in the web tell you to declare, e.g. CREATE TABLE t1 (f INT(11) UNSIGNED); -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=mdyk...@gmail.com -- - michael dykman - mdyk...@gmail.com May the Source be with you. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
RE: int(10) va int(11)
AFAIK, the number in parenthesis is ONLY for display purposes in formatting the size of the column in mySQL command line output, NOT the size of the data that can be held. I think they use (11) because unsigned will need one extra character for the minus sign. INT SIGNED = -2147483648 to 2147483647 Now this changes for things like a CHAR(2) where that *IS the column is only going to handle 2 characters. Or VARCHAR(10) where that column will handle from 0 to 10 characters. Same goes for FLOAT(7,4) which means 7 total digits and 4 of them are decimal places. But for *INT columns, I don't think the same is true. It's cosmetic only. Someone PLEASE correct me if I'm wrong. It's kind of silly if you ask me. This one special case just adds confusion. http://dev.mysql.com/doc/refman/5.0/en/numeric-types.html Another extension is supported by MySQL for optionally specifying the display width of integer data types in parentheses following the base keyword for the type (for example, INT(4)). This optional display width may be used by applications to display integer values having a width less than the width specified for the column by left-padding them with spaces. (That is, this width is present in the metadata returned with result sets. Whether it is used or not is up to the application.) The display width does not constrain the range of values that can be stored in the column, nor the number of digits that are displayed for values having a width exceeding that specified for the column. For example, a column specified as SMALLINT(3) has the usual SMALLINT range of -32768 to 32767, and values outside the range allowed by three characters are displayed using more than three characters. -Original Message- From: Ryan Chan [mailto:ryanchan...@gmail.com] Sent: Monday, June 14, 2010 9:14 AM To: MySql Subject: int(10) va int(11) Assume MySQL int range (unsigned) is from 0 to 4294967295 There are total 10 digits. Why a lot of tutorial in the web tell you to declare, e.g. CREATE TABLE t1 (f INT(11) UNSIGNED); -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=dae...@daevid.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
list rows with no recent updates
Hi, I ran a update command on around 2700 rows inside a mysql database table which has around 3000 table rows to change the ( say) price of each item ( with unique ID. unique product code). like: mysql UPDATE tbl_xyz set listprice='9.45' where prod_id='3069' and prod_code='a0071'; Query OK, 1 row affected (0.00 sec) Rows matched: 1 Changed: 1 Warnings: 0 How can I list rows with no recent updates ( or the once where the above updates were not done) or say with no updates in last 2 hours? Thank you.
RE: list rows with no recent updates
The only way I could think of is to have a column that's an auto updated timestamp and then just query using that time. `updated_on` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP So for your mass update, I'd SET @updated_time = NOW(); and then you could use that in your future query where @updated_time +/- some fuzzy amount of seconds. -Original Message- From: MadTh [mailto:madan.feedb...@gmail.com] Sent: Monday, June 14, 2010 2:02 PM To: mysql@lists.mysql.com Subject: list rows with no recent updates Hi, I ran a update command on around 2700 rows inside a mysql database table which has around 3000 table rows to change the ( say) price of each item ( with unique ID. unique product code). like: mysql UPDATE tbl_xyz set listprice='9.45' where prod_id='3069' and prod_code='a0071'; Query OK, 1 row affected (0.00 sec) Rows matched: 1 Changed: 1 Warnings: 0 How can I list rows with no recent updates ( or the once where the above updates were not done) or say with no updates in last 2 hours? Thank you. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: list rows with no recent updates
Do you have a timestamp field on this table? There's no way of seeing when a row was last updated unless you have a timestamp field that automatically updates for any change (that's *any* change - not necessarily the ones you want to keep track of) or creating your own and updating them either on the update statement itself or in a trigger. You can pretty much tell when the last time an entire table was updated by the date on the MYD or ibd file. I'm assuming you don't want to constantly parse the binlog or general log. On Mon, Jun 14, 2010 at 4:02 PM, MadTh madan.feedb...@gmail.com wrote: Hi, I ran a update command on around 2700 rows inside a mysql database table which has around 3000 table rows to change the ( say) price of each item ( with unique ID. unique product code). like: mysql UPDATE tbl_xyz set listprice='9.45' where prod_id='3069' and prod_code='a0071'; Query OK, 1 row affected (0.00 sec) Rows matched: 1 Changed: 1 Warnings: 0 How can I list rows with no recent updates ( or the once where the above updates were not done) or say with no updates in last 2 hours? Thank you. -- Jim Lyons Web developer / Database administrator http://www.weblyons.com
Re: list rows with no recent updates
Hi, Thank you all for your prompt response. Unfortunately timestamp file isn;t there, so I will find some other way to do it. Seems timestamp is a valuable field ( unless you want to save resource on generating timestamps on a very busy table). Thanks
RE: list rows with no recent updates
Easy enough to rectify http://dev.mysql.com/doc/refman/5.0/en/alter-table.html ALTER TABLE `tbl_xyz` ADD COLUMN `updated_on` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP AFTER `prod_id`; Personally I put a 'created_on' and an 'updated_on' column for mostly every table I create. 3000 rows is nothing. A mere blink of an eye to mySQL. The database I'm using is almost a Billion (yes, with a B, and I mean a good ol' USA 10^9 Billion, not that goofy long scale 10^12 Billion*) rows and 90GB. So don't worry about it. Plus it's stored internally as an integer (timestamp) *http://en.wikipedia.org/wiki/Long_and_short_scales -Original Message- From: MadTh [mailto:madan.feedb...@gmail.com] Sent: Monday, June 14, 2010 2:23 PM To: mysql@lists.mysql.com Subject: Re: list rows with no recent updates Hi, Thank you all for your prompt response. Unfortunately timestamp file isn;t there, so I will find some other way to do it. Seems timestamp is a valuable field ( unless you want to save resource on generating timestamps on a very busy table). Thanks -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
alias problem and odd warnings
Using 5.1.41/Ubuntu I have 2 tables, members countries. The former has a column, country_id (tinyint(3) unsigned). The countries id column is the same (although auto_increment). I'm trying to select just those countries for which there is a member. So I decided this query should do the trick: SELECT c.id, c.name FROM countries AS c INNER JOIN members AS m ON m.country_id = c.id GROUP BY c.id; And, indeed, it works like a charm. However, I'm using the CakePHP framework, which creates a query like: SELECT `Country`.`id`, `Country`.`name` FROM `countries` AS `Country` INNER JOIN members AS `Member` ON `Member`.`country_id` = 'Country.id' WHERE 1 = 1 GROUP BY `Country`.`id`; This not only gives an empty set, but also throws 171 warnings (more on that below). I've remove both the WHERE and GROUP BY clauses with no success. I've been staring at this for an hour now and can't see what the trouble is. Can any of you? As for the warnings: Warning | 1292 | Truncated incorrect DOUBLE value: 'Country.id' I've searched online a bit without success. There was a submitted bug: http://bugs.mysql.com/bug.php?id=46641 ... but I haven't been able to figure anything out based on that (except to agree that this error message is definitely not very enlightening). Can anyone shed some light? -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: alias problem and odd warnings
On 10-06-14 09:13 PM, brian wrote: Using 5.1.41/Ubuntu I have 2 tables, members countries. The former has a column, country_id (tinyint(3) unsigned). The countries id column is the same (although auto_increment). I'm trying to select just those countries for which there is a member. So I decided this query should do the trick: SELECT c.id, c.name FROM countries AS c INNER JOIN members AS m ON m.country_id = c.id GROUP BY c.id; And, indeed, it works like a charm. However, I'm using the CakePHP framework, which creates a query like: SELECT `Country`.`id`, `Country`.`name` FROM `countries` AS `Country` INNER JOIN members AS `Member` ON `Member`.`country_id` = 'Country.id' WHERE 1 = 1 GROUP BY `Country`.`id`; This not only gives an empty set, but also throws 171 warnings (more on that below). I've remove both the WHERE and GROUP BY clauses with no success. I've been staring at this for an hour now and can't see what the trouble is. Can any of you? Solved. I just noticed the quoting difference here: ON `Member`.`country_id` = 'Country.id' Country.id is entirely wrapped in single quotes rather than the alias and column being separately wrapped with back-ticks. I've changed my code so that the query is created properly. I'm still curious about the strange warning, though. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
normalization
Frankly speaking , Am looking very simple example for 5NF , Even i looked the lot of site , in most of the site they given clear information upto 3NF , But can u please tell me , 5NF with example, Regards Bharanikumar
