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  • insert exclusive locking

    - by Markus
    Hi, I have thought about the following SQL statements: INSERT INTO A(a1, a2) SELECT b1, udf_SomeFunc(b1) FROM B Where udf_SomeFunc makes a select on table A. As I understand, first, a shared lock is set on A (I am talking just about table A now), then, after this lock is released, an exclusive lock is obtained to insert the data. The question is: is it possible, that another transaction will get the exclusive lock on table A, just before the current transaction takes its exclusive lok on A?

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  • Hibernate - how to create list of pojos?

    - by AspNewbie
    I am very new to Hibernate. I have MySQL database and mapped pojos. What should I do next? I know little bit LINQ to SQL from .NET, and it generates me List of mapped objects. So basically, what are my next steps after creating POJOS if I want to have List of them and do CRUD operations upon them and data will be also saved in DB not only in java objects ? kthx

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  • Can I get the full query that a PreparedStatement is about to execute?

    - by ufk
    I'm working with PreparedStatement with MySQL server. example: String myQuery = "select id from user where name = ?"; PreparedStatement stmt = sqlConnection.prepareStatement(myQuery); stmt.setString(1, "test"); stmt.executeQUery(); ResultSet rs = stmt.getResultSet(); How can I receive the full SQL query that is about to be executed on the MySQL server? thanks!

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  • How do I check the Database type in a Rails Migration?

    - by Shaun F
    I have the following migration and I want to be able to check if the current database related to the environment is a mysql database. If it's mysql then I want to execute the SQL that is specific to the database. How do I go about this? class AddUsersFb < ActiveRecord::Migration def self.up add_column :users, :fb_user_id, :integer add_column :users, :email_hash, :string #if mysql #execute("alter table users modify fb_user_id bigint") end def self.down remove_column :users, :fb_user_id remove_column :users, :email_hash end end

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  • How to test if table was updated in Zend Framework?

    - by AD
    When user opens a form to modify a record, but instead of changing information, he just clicks the Update button. Which causes the update() function to return 0. However, I consider this case a valid update task. How would I test it, so I can assign a success message? Is update() returns -1 when SQL query failed or also 0? Method: Zend_Db_Table_Abstract::update() Any ideas? Thanks

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  • How to span multile tables in Django

    - by ipartola
    The Django documentation gives en example like so: b = Blog.objects.get(id=1) b.entry_set.all() Which from what I understand results in 2 queries. What if I wanted to get the blog, the blog entries and all the comments associated with that entry in a number of queries that does not depend on the number of entries? Or do I have to drop down to SQL to do that?

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  • problem with get http request from IPhone

    - by user317192
    Hi, I am writing a sample PHP Web Service that is sending GET Http request from the iphone to the web server. The server side code is returning JSON Data to iphone, the server side code looks like: function getUsers(){ $con=mysql_connect("localhost","root","123456") or die(mysql_error()); if(!mysql_select_db("eventsfast",$con)) { echo "Unable to connect to DB"; exit; } $sql="SELECT * from users"; $result=mysql_query($sql); if(!$result) { die('Could not successfully run query Error:'.mysql_error()); } $data = array(); while($row = mysql_fetch_assoc($result)){ $data['username'][] = $row['username']; $data['password'][]= $row['password']; } mysql_close($con); //print_r(json_encode($data)); //return (json_encode($data)); return json_encode('success'); } getUsers(); ? Its a simple code that Fetches all the data from the user table and send it to the iphone application. *****************************************************IPHONE APPLICATION (void)viewDidLoad { [super viewDidLoad]; responseData = [[NSMutableData data] retain]; NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://localhost:8888/GetData.php"]]; [[NSURLConnection alloc] initWithRequest:request delegate:self]; } (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { [responseData setLength:0]; } (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [responseData appendData:data]; } (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { label.text = [NSString stringWithFormat:@"Connection failed: %@", [error description]]; } (void)connectionDidFinishLoading:(NSURLConnection *)connection { [connection release]; NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; [responseData release]; NSError *error; SBJSON *json = [[SBJSON new] autorelease]; NSArray *luckyNumbers = [json objectWithString:responseString error:&error]; [responseString release]; if (luckyNumbers == nil) label.text = [NSString stringWithFormat:@"JSON parsing failed: %@", [error localizedDescription]]; else { NSMutableString *text = [NSMutableString stringWithString:@"Lucky numbers:\n"]; for (int i = 0; i < [luckyNumbers count]; i++) [text appendFormat:@"%@\n", [luckyNumbers objectAtIndex:i]]; NSLog(text); label.text = text; } } ********************PROBLEM**************** The problem is that nothing is coming on iphone side of the application........... the response doesn't contains anything.............. Please help..............

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  • Disable automatic index on related object id from yml

    - by BugBusterX
    Doctrine Automatically creates indexes on columns that are used to define object relations, For example user: id, name message: id, sender_id, receiver_id, message if I define relationship between message and user in a way that message has one Sender and has one Receiver, doctrine will automatically index sender_id and receiver_id fields when I generate sql from model. I would like to disable index on sender, because I manually create index with sender_id and receiver id together. How can I disable auto generated index?

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  • Question on Books

    - by rockbala
    I am a learning SQL, HTML now. I would like to learn the following two more... Java, XML. I want to understand these two from testing and Web Services point of view. Is there a better order to learn the next two Java, XML or XML, Java?

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  • Populating a Combobox inside a Gridview

    - by Nawait
    i'm having a few problems working with a gridview and a combobox inside of it. Here is the code for my ListView control: <ListView Height="139" HorizontalAlignment="Left" Margin="10,158,0,0" Name="lvAppointment" VerticalAlignment="Top" Width="250" MinWidth="350"> <ListView.View> <GridView> <GridViewColumn Header="Appointment" Width="120"> <GridViewColumn.CellTemplate> <DataTemplate> <DatePicker SelectedDate="{Binding Path=Appointment}"/> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> <GridViewColumn Header="Type" Width="170"> <GridViewColumn.CellTemplate> <DataTemplate> <ComboBox ???/> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> <GridViewColumn Header="Done" Width="50"> <GridViewColumn.CellTemplate> <DataTemplate> <CheckBox IsChecked="{Binding Path=Done}" IsThreeState="False"/> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> </GridView> </ListView.View> I'm popluating the list from a sql ce database via c# with the following code using (SqlCeCommand sqlCeAppointment = new SqlCeCommand("SELECT appid,appointment,done,apptype.type FROM appointment INNER JOIN apptype ON appointment.refatid = apptype.atid WHERE refeventid = @eventid;", sqlCeConn)) { sqlCeAppointment.Parameters.AddWithValue("@eventid", ((cListEventItem)lvEvent.SelectedItems[0]).id); using (SqlCeDataReader sqlCeAppointmentReader = sqlCeAppointment.ExecuteReader()) { lvAppointment.Items.Clear(); while (sqlCeAppointmentReader.Read()) { lvAppointment.Items.Add(new cListAppointmentItem { id = sqlCeAppointmentReader.GetGuid(sqlCeTerminReader.GetOrdinal("appid")), Appointment = sqlCeAppointmentReader.GetDateTime(sqlCeTerminReader.GetOrdinal("appointment")), Type = sqlCeAppointmentReader.GetString(sqlCeTerminReader.GetOrdinal("type")), Done = sqlCeAppointmentReader.GetByte(sqlCeTerminReader.GetOrdinal("done")) }); } } } I can popluate the list just fine. But i want "Type" to be a combobox so the user can select the apropriate type of the appointment (its a list of appointments connected to an event). This combobox should be filled with data thats inside a table of the sql ce database (apptype). This table is not static, the users can add and delete items from this list. I have tried a few ways i found via google, but failed. I guess i'm having problems understanding how this works/should work. I hope someone can help me :( Thanks in advance

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  • binlog_format = STATEMENT and CURRENT_TIMESTAMP with MySQL replication

    - by xma
    Hi, can a MySQL slave instance have different row values for the same ID when binlog_format is set to STATEMENT and we insert something like: insert into foo values(CURRENT_TIMESTAMP) As I understand it, the slave read the SQL statement and execute it thus, if the replication is lagging, could lead to differences for the same row. Right or wrong ? How can I avoid this situation ? Thank you.

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  • SSIS Package deployed - Fails when executed from schedule

    - by alex
    I've deployed a SSIS package to my SQL server. I can run the package fine by connecting to Integration Services in SSMS and right clicking on it and choosing "Run Package" However, if I schedule the package, it fails. It tells me to check the logs for information on why, but there is nothing in there... Any ideas? (this is my first SSIS package by the way)

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  • mysqldump problem with case sensitivity? Win->linux

    - by acidzombie24
    When i dump a table with uppercase letters using mysqldump it comes out as lower case in my dump.sql file. I found a report here in 2006, almost 4 years old http://bugs.mysql.com/bug.php?id=19967 A solution here suggest making linux insensitive. I rather not if possible. Whats the easiest way to copy a win32 db into linux?

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  • How to store data which contains quotes in MySQL

    - by Nitz
    In one of my forms I use the rich text editor from Yahoo!. Now i want to store the data from that textarea in a MySQL database. The user can enter anything in that textarea, e.g. many double or single quotes. How can I store that data? Normally we store by adding that data in one variable and then put that in sql, but the quotes cause problems.

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  • Capture Stored Procedure print output in .NET (Different model!)

    - by Workshop Alex
    Basically, this question with a difference... Is it possible to capture print output from a TSQL stored procedure in .NET, using the Entity Framework? The solution in the other question doesn't work for me. It works with the connection type from System.Data.SqlClient but I'm using the one from System.Data.EntityClient which does not have an InfoMessage event. (Of course, I could just create an SQL connection based on the Entity connection settings, but prefer to do it directly.)

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  • Operation precedence on postgress

    - by user24691
    I have set new division on postgress pg_operator table because i want tath when is division by zero return 0. i have write this: create operator / ( procedure = zero_division, leftarg = double precision, rightarg = double precision); where zero_division is: CREATE OR REPLACE FUNCTION zero_division(double precision, double precision) RETURNS double precision AS 'select case when $2 = 0 then 0 else $1 / $2::real end;' LANGUAGE sql IMMUTABLE COST 100; when i run value/ 0 i get error of division.

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  • Mysql Left join with condition on column

    - by skicster
    Hi, can you help me with sql query? I have this problem: I have two tables "Join" table: Reservation_has_meal +----------------+ | id_reservation | | id_meal | | pieces | +----------------+ and table with data: Meal +-------------+ | id_meal | | name | +-------------+ Sample data for Meal: 1 | carrot 2 | potatoe 3 | cucumber Reservation_has_meal 1 | 2 | 5230 1 | 3 | 1203 How can I get this result for reservation with id_reservation=1: id_meal | id_Reservation | name | pcs | -------------------------------------------- 1 | 1 | carrot | null| 2 | 1 | potatoe | 5230| 3 | 1 | cucumber | 1203| -------------------------------------------- And result for id_reservation = 2: id_meal | id_Reservation | name | pcs | -------------------------------------------- 1 | 2 | carrot | null| 2 | 2 | potatoe | null| 3 | 2 | cucumber | null| -------------------------------------------- Thanks for advice.

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  • please suggest good variable names that represent theirself ( php)

    - by I Like PHP
    Hi all, it may be wrong place to ask this question, but i hope u all programmer must have the interesting naming convention of variables. i have seen many places that some variable names are very good n effective like common variable names $link $db $connect $query $stmt $sql $qry $output $result $list so please suggest me some good names for variable , bcoz all time i have to write $x, $y etc.. if i want to save something instantly on page...that are even not relevant, so please suggest me good variable names

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