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  • Improve mysql JDBC insert call

    - by richs
    i have a legacy Java system that every time it gets an order it makes a JDBC call to a stored procedure for each field in the order. Generally the stored procedure will get called 20 to 30 times for each order. The store procedure is just doing an insert into a table for each field. i need to improve the performance of this operation. one thought i had was to create an insert query string that does multiple inserts in one JDBC call. MySql supports a multiple insert string. INSERT INTO PersonAge (name, age) VALUES ('Helen', 24), ('Katrina', 21), ('Samia', 22), ('Hui Ling', 25), ('Yumie', 29) This has the advantage of only requiring one JDBC call per order. Any other ideas on how to improve performance?

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  • Views performance in MySQL for denormalization

    - by Gianluca Bargelli
    I am currently writing my truly first PHP Application and i would like to know how to project/design/implement MySQL Views properly; In my particular case User data is spread across several tables (as a consequence of Database Normalization) and i was thinking to use a View to group data into one large table: CREATE VIEW `Users_Merged` ( name, surname, email, phone, role ) AS ( SELECT name, surname, email, phone, 'Customer' FROM `Customer` ) UNION ( SELECT name, surname, email, tel, 'Admin' FROM `Administrator` ) UNION ( SELECT name, surname, email, tel, 'Manager' FROM `manager` ); This way i can use the View's data from the PHP app easily but i don't really know how much this can affect performance. For example: SELECT * from `Users_Merged` WHERE role = 'Admin'; Is the right way to filter view's data or should i filter BEFORE creating the view itself? (I need this to have a list of users and the functionality to filter them by role). EDIT Specifically what i'm trying to obtain is Denormalization of three tables into one. Is my solution correct? See Denormalization on wikipedia

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  • Find and replace string in MySQL using data from another table

    - by Charlie
    Hi, sorry for formatting this wonky but hope you can understand it. I have two MySql tables, and I want to find and replace text strings in one using data in another. Texts - one column: messages 'thx guys' 'i think u r great' 'thx again' ' u rock' Dictionary - two columns: bad_spelling, good_spelling 'thx' 'thanks' ' u ' ' you ' ' r ' ' are ' I want SQL to go through and look at every row in messages and replace every instance of bad_spelling with good_spelling, and to do this for all the pairs of bad_spelling and good_spelling The closest I have gotten is this: update texts, dictionary set texts.message = replace(texts.message, dictionary.bad_spelling, dictionary.good_spelling) But this only changes 'thx' to 'thanks' (in 2 rows) and does not go on to replace ' u ' with ' you' or ' r ' with ' are '. Any ideas how to make it use all the rows in dictionary in the replace statement? -- PS forgot to mention that this is a small example and in the real thing I will have a lot of find/replace pairs, which may get added to over time.

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  • Mysql CASE - WHEN - THEN - returning wrong data type (blob)

    - by Jack
    Hi there. Im creating customizable product attributes in a web store - each attribute can have different type of data, each data type is stored in a separate column using corresponding mysql datatype. I Have a query like: SELECT products.id AS id, products.sku AS sku, products.name AS name, products.url_key AS url_key, attributes.name AS attribute, CASE WHEN `attribute_types`.`type` = 'text' THEN product_attribute_values.value_text WHEN `attribute_types`.`type` = 'float' THEN product_attribute_values.value_float WHEN `attribute_types`.`type` = 'price' THEN product_attribute_values.value_float WHEN `attribute_types`.`type` = 'integer' THEN product_attribute_values.value_integer WHEN `attribute_types`.`type` = 'multiple' THEN product_attribute_values.value_text WHEN `attribute_types`.`type` = 'dropdown' THEN product_attribute_values.value_text WHEN `attribute_types`.`type` = 'date' THEN product_attribute_values.value_date WHEN `attribute_types`.`type` = 'textarea' THEN product_attribute_values.value_textarea END as value from (...) Now, the problem is that when attribute_types.type equals to ?some-type? i want it to return a value as it's stored in product_attribute_values table. Currently I get BLOb every time. Should I use type-casting or there's some behind-the-scene magic that I dont know about, OR maybe there's some better alternative ?

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  • Compare two String with MySQL

    - by Scorpi0
    Hi, I wan't to compare two strings in a SQL request so I can retrieve the best match, the aim is to propose to an operator the best zip code possible. For example, in France, we have Integer Zip code, so I made an easy request : SELECT * FROM myTable ORDER BY abs(zip_code - 75000) This request returns first the data closest of Paris. Unfortunatelly, United Kingdom have zip code like AB421RS, so my request can't do it. I see in SQL Server a function 'Difference' : http://www.java2s.com/Code/SQLServer/String-Functions/DIFFERENCEworkoutwhenonestringsoundssimilartoanotherstring.htm But I use MySQL.. Is there anyone who have a good idea to do the trick in one simple request ? PS : the Levenshtein Distance will not do it, as I really wan't to compare string like if they were number. ABCDEF have to be closer to AWXYZ than to ZBCDEF.

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  • mysql Command timeout error

    - by Rahul Malhotra
    I am converting my database from sql server 2005 to mysql using asp .net mvc. I have bulk data in sql server(around 4 lakh records), But i am facing command timeout/wating for comand timeout error which when i search on google can be given 65535 as its highest value Or can be given 0 if someone wants that comand should wait for unlimited time untill its above command get executed. Both of these a'int working with me. I also have given any connectTimeout to 180. So shoiuld i have to change it too. Anybody who had face this problem or have any confirm knowledge please share

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  • mysql - select pagination chunk that includes a given id

    - by sean smith
    ...before the pagination chunks have been determined. I know you can do this in multiple statements, but there must be a better way. my results are returned ordered by date and I want to return the pagination chunk that contains a given id. So I could, for example, select the date of the given id and then select a chunk of results where date is less than or greater than the date. That would work. But is there some native mysql method of doing this sort of thing in one statement? It just seems reasonable to expect that we could ask for X results in which a given id exists if results are ordered by date.

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  • iWebKit/iPhone: Chatbox with MySQL, AJAX, PHP and Javascript

    - by YourComputerHelpZ
    Hello, i am busy with a chatbox that contains MySQL, AJAX, PHP and Javascript. Now i want to have this on my iPod Touch/iPhone, so i am building a website with iWebKit. The following codes i provided is done now; just asking why it does not display the chatbox itself (so not the senders) after more than 2 lines are entered... What codes should i add or remove... Thanks. I guess something with CSS or so, but i am not sure where i should apply it and what... Or maybe something else? Download .zip here with all files

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  • Mysql Real Escape String PHP Function Adding "\" to My Field Entry

    - by Jascha
    Hello, I am submitting a form to my mySql database using PHP. I am sending the form data through the mysql_real_escape_string($content); function. When the entry shows up in my database (checking in myPhpAdmin) all of my double quotes and single quotes are escaped. I'm fairly certain this is a PHP configuration issue? so: $content = 'Hi, my name is Jascha and my "favorite" thing to do is sleep'; mysql_real_escape_string($content); $query = 'INSERT INTO DB...' comes up in my database as: Hi, my name is Jascha and my \"favorite" thing to do is sleep Who do I tell what to do? (I cannot access the php.ini). -J

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  • ETL mechanisms for MySQL to SQL Server over WAN

    - by Troy Hunt
    I’m looking for some feedback on mechanisms to batch data from MySQL Community Server 5.1.32 with an external host down to an internal SQL Server 05 Enterprise machine over VPN. The external box accumulates data throughout business hours (about 100Mb per day), which then needs to be transferred internationally across a WAN connection to an internal corporate environment before some BI work is performed. This should just be change-sets making their way down each night. I’m interested in thoughts on the ETL mechanisms people have successfully used in similar scenarios before. SSIS seems like a potential candidate; can anyone comment on the suitability for this scenario? Alternatively, other thoughts on how to do this in a cost-conscious way would be most appreciated. Thanks!

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  • mysql way to make a lock in a php page

    - by Cris
    Hello, i have the following mysql table: myTable: id int auto_increment voucher int not null id_user int null I've populated voucher field with values from 1 to 100000 so i've got 100000 records; when a user clicks a button in a PHP page, i need to allocate a record for the user so i make something similar like: update myTable set id_user=XXX where voucher=(SELECT * FROM (SELECT MIN(voucher) FROM myTable WHERE id_user is null) v); The problem is that I don't use locks and i should use them because if two users click in the same moment i risk to assign the same voucher to different persons (2 updates in the same record so i lose 1 user) ... I think there must be a correct way to do this, can you help me please? Thanks ! cris

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  • Javamelody with Tomcat and MySql

    - by Shane
    I have setup a web application in Tomcat with Javamelody and MySql. I am able to see the JDBC connection details under system info so I know that Javamelody is able to connect to the database. I have executed select/update statements from my application but nothing is ever shown on the monitoring page under statistics sql. I have executed "show full processlist" using the same user as my database connection and it works fine. I can't work out what I am doing wrong. Any ideas?

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  • Attach data to Richtext using flex, mysql and php(newbie)

    - by dmschenk
    I'm trying to attach data to a richtext field in Flashbuilder. The data is an html string in a mysql database and I'm connecting using php. The php script is just converting to XML. The connection works because I can easily dump the data to a datagrid and I can see the string. when I try to hook the data to a Richtext field I get "object CallResponder" so I am connected, but I'm not sure how to break it down so that it is just an html string for the text field. Thanks protected function creationCompleteHandler(event:FlexEvent):void { getAllAbout_fxResult.token = aboutfxService.getAllAbout_fx(); } <s:RichText x="10" y="10" text="{getAllAbout_fxResult}" creationComplete="creationCompleteHandler(event)" width="300" height="300"/>

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  • Mysql IN clause, php array

    - by robert knobulous
    I know that this has been asked and answered before, but for the life of me I cannot find where I am going wrong. My code is below. $backa = array("1", "7", "8", "9", "12"); $backaa = implode(",", $backa); /* code to create connection object $wkHook */ $getOpt=$wkHook->prepare("select movementId, movementName from Movement where movementId IN ($backaa) order by movementName asc"); $getOpt->execute(); $getOpt->store_result($id, $name); Every time I run this I get one of two errors depending upon how I use the $backaa variable. More often than not I get a call to a non-object error indicating that $getOpt is not a proper Mysql query. I have tried every fashion of quoting, bracketing, etc for the $backaa variable but it's just not working for me. What obvious thing am I missing?

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  • Variable for the field name of mysql row result

    - by ana
    I'm retrieving a row with php from mysql and it has fields like: name_en, name_es, name_de... I want to retrieve the right field base on my $lang variable (en, es, de...). If the $lang variable is 'es', I'd need to get $row['name_es']. I've tried this (based on this thread), but it's not working: $name = $row->{'name_'.$lang}; Any idea how can I use a variable as the name of the field of a row? Thanks in advance for your help!

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  • mysql fulltext search as level2 index

    - by Nir
    lets say I have a table with product details. one of the fields is category (integer). I want to do fulltext search on product name in specific category. Unfortunately Mysql does not allow me to specify index that includes category and product name as fulltext. It looks like I can use fulltext only on product_name and theefore any fulltext search will search product names in all categories. Is there any way to solve this (allow fulltext search/index only on products in category)?

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  • How to manage a large dataset using Spring MySQL and RowCallbackHandler

    - by rmarimon
    I'm trying to go over each row of a table in MySQL using Spring and a JdbcTemplate. If I'm not mistaken this should be as simple as: JdbcTemplate template = new JdbcTemplate(datasource); template.setFetchSize(1); // template.setFetchSize(Integer.MIN_VALUE) does not work either template.query("SELECT * FROM cdr", new RowCallbackHandler() { public void processRow(ResultSet rs) throws SQLException { System.out.println(rs.getString("src")); } }); I get an OutOfMemoryError because it is trying to read the whole thing. Any ideas?

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  • MySQL Stored Procedure: Boolean Logic in IF THEN

    - by xncroft
    I'm looking for the proper syntax (if this is possible in MySQL stored procedures) for using logical operators in an IF THEN statement. Here's something along the lines of what I would like to do, but I'm not certain if I should type "OR" or "||" in the IF ... THEN clause: DELIMITER $$ CREATE PROCEDURE `MyStoredProc` (_id INT) BEGIN DECLARE testVal1 INT DEFAULT 0; DECLARE testVal2 INT DEFAULT 0; SELECT value1, value2 INTO testVal1, testVal2 FROM ValueTable WHERE id = _id; IF testVal1 > 0 OR testVal2 > 0 THEN UPDATE ValueTable SET value1 = (value1+1) WHERE id=_id; END IF; END$$

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  • ArgumentOutOfRangeException at MySql execution. (MySqlConnector .NET)

    - by Lazlo
    I am getting this exception from a MySqlCommand.ExecuteNonQuery(): Index and length must refer to a location within the string. Parameter name: length The command text is as follows: INSERT INTO accounts (username, password, salt, pin, banned, staff, logged_in, points_a, points_b, points_c, birthday) VALUES ('adminb', 'aea785fbcac7f870769d30226ad55b1aab850fb0979ee00481a87bc846744a646a649d30bca5474b59e4292095c74fa47ae6b9b3a856beef332ff873474cc0d3', 'cb162ef55ff7c58c7cb9f2a580928679', '', '0, '0', '0', '0', '0', '0', '2010-04-18') Sorry for the long string, it is a SHA512 hash. I tried manually adding this data in the table from MySQL GUI tools, and it worked perfectly. I see no "out of range" problem in these strings. Does anybody see something wrong?

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  • Mysql : get data from 2 tables (need help)

    - by quangtruong1985
    Assume that I have 2 tables : members and orders (Mysql) Members : id | name 1 | Lee 2 | brad Orders : id | member_id | status (1: paid, 2: unpaid) | total 1 | 1 | 1 | 1000000 2 | 1 | 1 | 1500000 3 | 1 | 2 | 1300000 4 | 2 | 1 | 3000000 5 | 2 | 2 | 3500000 6 | 2 | 2 | 3300000 I have a sql query : SELECT m.name, COUNT(o.id) as number_of_order, SUM(o.total) as total2 FROM orders o LEFT JOIN members m ON o.member_id=m.id GROUP BY o.member_id which give me this: name | number_of_order | total2 Lee | 3 | 3800000 brad | 3 | 9800000 All that I want is something like this : name | number_of_order | total2 | Paid Unpaid | Paid Unpaid ------------------------------------------------ Lee | 3 | 3800000 | 2 1 | 2500000 1300000 ------------------------------------------------ brad | 3 | 9800000 | 1 2 | 3000000 6800000 ------------------------------------------------ How to make a query that can give me that result? Thanks for your time!

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  • Maximum number of workable tables in SQL Server And MySQL

    - by Kibbee
    I know that in SQL Server, the maximum number of "objects" in a database is a little over 2 billion. Objects contains tables, views, stored procedures, indexes, among other things . I'm not at all worried about going beyond 2 billion objects. However, what I would like to know, is, does SQL Server suffer a performance hit from having a large number of tables. Does each table you add have a performance hit, or is there basically no difference (assuming constant amount of data). Does anybody have any experience working with databases with thousands of tables? I'm also wondering the same about MySQL.

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  • MYSQL OR vs IN performance

    - by Scott
    I am wondering if there is any difference in regards to performance between the following SELECT ... FROM ... WHERE someFIELD IN(1,2,3,4) SELECT ... FROM ... WHERE someFIELD between 0 AND 5 SELECT ... FROM ... WHERE someFIELD = 1 OR someFIELD = 2 OR someFIELD = 3 ... or will MySQL optimize the SQL in the same way compilers will optimize code ? EDIT: Changed the AND's to OR's for the reason stated in the comments.

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  • how to install mysqlDb for MySQL and Python ON WINDOWS

    - by Spikie
    I AM A NET DEVELOPER TRY TO INSTALL MYSQLDB FOR PYTHON I KEEP HAVING THIS ERROR MESSAGE raise ImproperlyConfigured("Error loading MySQLdb module: %s" % e) django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module: No module named MySQLdb I AM FOLLOWING THIS INSTRUCTION FROM THIS SITE <"http://sourceforge.net/project/shownotes.php?release_id=303257" I DO NOT UNDERSTAND THESE LINES Windows ....... C:... python setup.py install C:... python setup.py bdist_wininst The latter example should build a Windows installer package, if you have the correct tools. In any event, you must have a C compiler. Additionally, you have to set an environment variable (mysqlroot) which is the path to your MySQL installation. In theory, it would be possible to get this information out of the registry, but like I said, I don't do Windows, but I'll accept a patch that does this. I HAVE BEEN SEARCHING FOR ANSWER ALL DAY PLEASE DO ANYBODY REALLY KNOW HOW TO DO THIS OR AT LEAST POINT ME IN THE RIGHT DIRECTION???? THANKS and what is the c compiler for???????

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  • MySQL configuration that allows for locking many tables?

    - by Floyd Bonne
    I need to do a MySQLDump on a DB with ~700 tables and when I try with my current configuration, I get an error: mysqldump: Got error: 1016: Can't open file: './my_db/content_node_field_instance.frm' (errno: 24) when using LOCK TABLES Searching around I've found that this happens because it tries to lock all tables and fails because they are "too many". I know I can try lock-tables=no and get a dump, but this way my DB might be in an inconsistent state. So, does anyone know what is the MySQL configuration setting I need to change in order to be able to do the locking I need? I'm running 5.1.37-1ubuntu5.1 with MyISAM. Thanks!

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  • MySQL LOAD DATA LOCAL INFILE example in python?

    - by David Perron
    I am looking for a syntax definition, example, sample code, wiki, etc. for executing a LOAD DATA LOCAL INFILE command from python. I believe I can use mysqlimport as well if that is available, so any feedback (and code snippet) on which is the better route, is welcome. A Google search is not turning up much in the way of current info The goal in either case is the same: Automate loading hundreds of files with a known naming convention & date structure, into a single MySQL table. David

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