Handling Character Large Objects In Java Application
Jul 13, 2004
In my Java application, I have a stream of character data in a java.io.Reader object.
I am using a PreparedStatement object to insert data into a table containing such a large object column (datatype - text). I am using the following API call:
PreparedStatement.setCharacterStream(colIndex, reader, size);
In order to find the size in the above statement, I read the stream and find the length.
Because of this I am getting the following error message and the data is not getting inserted:
Exception during insertion : Failed for MYTABLE Reason [Microsoft][SQLServer 2000 Driver for JDBC]Transliteration failed.
Is there any alternate method to handle this? Please help.
Hi.. We have a java application which connect to our MS-SQL DB during midnight using JDBC connector and extract information. But very often ,the java applicatian halted and because of the deadlock as shown below.
Caused by: java.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC][SQLServer]Transaction (Process ID 54) was deadlocked o n lock resources with another process and has been chosen as the deadlock victim.
now the java programmer is blaming me that the MS SQL DB is having deadlock and cause their Java application to hang.
Is there any way to clear the deadlock before the the Java applcation run or how to prove the Java application script itself is having problem and causing the deadlock ?
Hey all, I've got a question and after doing some research I've found only a vague reference but no clear answer.
I have a java app that will be passing parameters to my stored procedure. I'll grab the requested info from the tables but instead of sending it back to the java app that sent the request, I need to send it to a "different" java app (the second java app will not be running at the time).
Can someone point me to a good source for executing java applications from a stored procedure?
Help me please with one problem which I'm facing with while deploying java server application on my computer (this java app is jBilling). I have configured it as it was said in docs, I have added environment variable CLASPATH as Microsoft documentation said. I'm using SQL Server JDBC driver 1.2 by Microsoft. The result is that I find this message in log file:
2007-05-27 17:21:41,906 WARN [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] Throwable while attempting to get a new connection: null org.jboss.resource.JBossResourceException: Could not create connection; - nested throwable: (org.jboss.resource.JBossResourceException: Failed to register driver for: com.microsoft.jdbc.sqlserver.SQLServerDriver; - nested throwable: (java.lang.ClassNotFoundException: No ClassLoaders found for: com.microsoft.jdbc.sqlserver.SQLServerDriver)) at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:168) ... and so on.
I have copied sqljdbc.jar to lib folder of the server. That's how I specified connection string:
Lets say you want to offer users access to a table that has over 1,000,000 records in it. You dont want to fetch the entire table into a dataset. Even with paging, it will still cause a performance lag, will it not ?Lets say there was a column that held last names. You could then divide up all the data in to alphabetical groups by letter. That will at least let you split up the data 26 different ways (letters in teh alphabet). Thats still roughly 38,000 possible records in the dataset at any given time. I suppose since the database and web server are very close to each other, physically, the latency shouldnt be too bad. However, Im worried about having several dozen or more users, each requesting datasets with tens of thousands of records. That would cause the memory use on the web server to spike most likely. Right now, its just one user do this sort of processing, but that might grow to include several dozens.ideas ?
Hi I have created one store procedure which handles global updates I am using cursor to fetch one be one row for updating (It is required for implementing business logic)Now when i execute this store procedure ---it gives me dedlock error , I dont know why i m getting this error(Approx number of rows 1.5lakh)if then i removed unnecessary records from table (Approx -50000) it works fine,Is there any way to handle itI am calling this storeprocedure from my window service.please give me a good solution if possible
Hi, Ive got a report using a List item that is vertically displaying the columns from a table. The problem I run into, is that some of the fields in this table contain large blocks of text where the users have entered comments and such.
I am using Textboxes to display this data.
So my report will look something like ----- Field label 1 Field value 1 Field label 2 Field value 2 Field label 3
<white space>
<page break>
Field value 3 ---> this is a big block of text Field label 4 Field value 4 etc ------ It appears as though the report attempts to keep the contents of each textbox together even if that means breaking onto an entirely new page to do this. I would prefer for the data to flow more natrually instead where the page breaks in the middle of the data being displayed should it be too large to fit on the page it started on.
----- Field label 1 Field value 1 Field label 2 Field value 2 Field label 3 Field value 3 --- As much as can fit on this page
<page break>
Field value 3 ---> remaining data that broke over the page Field label 4 Field value 4 etc ------
Developing an application, which is handling encrypting for a SQL server 2005 DB at the application level, using symmetric AES encryption. After being encrypted the data is being sent to the SQL server 2005 DB to be inserted. This is what I want to accomplish. But I have one or two questions as I am going through the research for my project.
Encrypting the data shouldn€™t be that big a deal, but can SQL server 2005 handle to insert these data? If yes how? I am thinking just simple SQL INSERT statements? When the data are inserted can SQL server, as it supports AES encryption, through the DBMS decrypt the data as they have been encrypted else where and then perform specific functions? (by specific function I just mean any function that may have to run, it could be any function one could think of) How difficult would it be to take the encrypted data from SQL server to the application and then at the application level decrypt these? Any help on the above questions is highly appreciated or if people have any comment on the subject I would be more than happy to receive these.
Developing an application, which is handling encrypting for a SQL server 2005 DB at the application level, using symmetric AES encryption. After being encrypted the data is being sent to the SQL server 2005 DB to be inserted. This is what I want to accomplish. But I have one or two questions as I am going through the research for my project.
Encrypting the data shouldn€™t be that big a deal, but can SQL server 2005 handle to insert these data? If yes how? I am thinking just simple SQL INSERT statements. When the data are inserted can SQL server, as it support AES encryption, through the DBMS decrypt the data as they have been encrypted else where and then perform specific functions? (by specific function I just mean any function that may have to run, it could be any function one could think of) How difficult would it be to take the encrypted data from SQL server to the application and then at the application level decrypt these? Any help on the above questions is highly appreciated or if people have any comment on the subject I would be more than happy to receive these.
We have created several Table Valued User Defined Functions in a Production SQL Server 2005 DB that are returning large (tens of thousands of) rows obtained through a web service. Our code is based on the MSDN article Extending SQL Server Reporting Services with SQL CLR Table-Valued Functions .
What we have found in our implementations of variations of this code on three seperate servers is that as the rowset grows, the length of time required to return the rows grows exponentially. With 10 columns, we have maxed out at approximately 2 500 rows. Once our rowset hit that size, no rows were being returned and the queries were timing out.
Here is a chart comparing the time elapsed to the rows returned at that time for a sample trial i ran:
It took 570 seconds (just over 9 1/2 minutes to return 2566 rows).
The minute breakdown during my trial is as follows: 1 = 655 (+ 655) 2 = 1081 (+ 426) 3 = 1325 (+244) 4 = 1610 (+285) 5 = 1822 (+212) 6 = 1988 (+166) 7 = 2160 (+172) 8 = 2308 (+148) 9 = 2451 (+143)
As you can tell, except for a few discrepancies to the resulting row count at minutes 4 and 7 (I will attribute these to timing as the results grid in SQL Management Studio was being updated once every 5 seconds or so), as time went on, fewer and fewer rows were being returned in a given time period. This was a "successful" run as the entire rowset was returned but on more than several occasions, we have reached the limit and have had 0 new rows per minute towards the end of execution.
Allow me to explain the code in further detail:
[SqlFunction(FillRowMethodName = "FillListItem")] public static IEnumerable DiscoverListItems(...) {
ArrayList listItems = new ArrayList();
SPToSQLService service = new SPToSQLService();
[...]
DataSet itemQueryResult = service.DoItemQuery(...); // This is a synchronous call returning a DataSet from the Web Service
//Load the DS to the ArrayList
return listItems; }
public static void FillListItem(object obj, out string col1, out string col2, out string col3, ...) {
As you will notice, the web service is called, and the DataSet is loaded to an ArrayList object (containing ArrayList objects), before the main ArrayList is returned by the UDF method. There are 237 rows returned within 10 seconds, which leads me to believe that all of this has occured within 10 seconds. The method GetListItems has executed completely and the ArrayList is now being iterated through by the code calling the FillListItem method. I believe that this code is causing the result set to be returned at a decreasing rate. I know that the GetListItems code is only being executed once and that the WebService is only being called once.
Now alot of my larger queries ( > 20 000 rows) have timed out because of this behaviour, and my workaround was to customize my web service to page the data in reasonable chunks and call my UDF's in a loop using T-SQL. This means calling the Web Service up to 50 times per query in order to return the result set.
Surely someone else who has used Table Valued UDFs has come accross this problem. I would appreciate some feedback from someone in the know, as to whether I'm doing something wrong in my code, or how to optimize an SQL Server properly to allow for better performance with CLR functions.
I am developing a simple ASP based form, that stores user info in MS SQL server. I have created a table in the SQL server to store the data and defined the body field with this line: `body char(255)`. The problem is that if the user inputs a string longer then 255 characters it gets choped off. How would you suggest solving this problem? Should I use `text` datatype instead?? Any comments are very appreciated !!!
Hi, Our database has very large number of objects. We have a naming convension by modules, subprojects etc. But for example when we need to open a specific table it still takes time to find it. If we could create custom folders under table folder or stored procedure folder it will be easier to find an object. We could create sub folders by module, subproject and classify our objects with these folders. Will the next version SQL Server 2008 support this kind of functionality?
i need to retrieve a large amount of data from the sql server database and make changes to one field and put the data back using a console application. how do i do it?
please help newbieI need to create a lot of objects the same type (let's say: schemas)I wish to use paramerized block in loop to do so.- how to put names of my objects to such control-flow?belss you for help
passing serialised objects to a stored procedure for the purpose of data inserts. I see this as being a way to handle multiple row inserts efficiently.
However, in my limited use of XML data I am not so sure how to link the data when I have a dependency on another "object" within the serialised XML.
Below is a code snippet showing what I have so far.
The first insert statement works fine - but how to retrieve the identifier created by the DB - I want to use an SQL statement that finds the record in the table based on the XML representation (of the PluginInfo), allowing me to insert the ConfigurationInfo with the correct reference to the PluginInfo
DECLARE @Config NVARCHAR(MAX) DECLARE @Handle AS INT DECLARE @TransactionCount AS INT SELECT @Config = ' <ConfigurationDirectory > <ConfigurationInfo groupKey="Notifications" sectionKey="App.Customization.PluginInfo"
I have a table like this below and it doesn't only contain English Names but it also contain Chinese Name. CREATE TABLE Names (FirstName NVARCHAR (50), LastName NVARCHAR (50)); I tried to view the column using SQL Query Analyzer, It didn't display Chinese Character. I know that SQL Server 2005 is using UCS-2 Encoding and Chinese Character uses Double Byte Character Set (DBCS) Encoding. I want to read the FirstName and LastName columns and display in Window Form Data Grid and ASP.NET Grid View. I tried to use this code below and it didn't work. It convert some of the English Name to Chinese Character and it display the chinese character and some still in the original unreadable characters. Does anybody know how to read those character from SQL Table and display the correct Chinese Character without converting the English Name into Chinese also? Thanks
int codePage = 950; StringBuilder message = new StringBuilder(); Encoding targetEncoding = Encoding.GetEncoding(codePage); byte[] encodedChars= targetEncoding.GetBytes(str); . message.AppendLine("Byte representation of '" + str + "' in Code Page '" + codePage + "':"); for (int i = 0; i < encodedChars.Length; i++) { message.Append("Byte " + i + ": " + encodedChars); }
message.AppendLine(" RESULT : " + System.Text.Encoding.Unicode.GetString(encodedChars)); Console.Writeline(message.ToString());
My preferred programming language is Java (sorry Microsoft). I've searched for examples of running DMX queries into an Analysis Services database from Java but failed to locate any. I've seen suggestions that XMLA could be used but again, I can't locate any examples (in any language). For my current project I ran up the white flag and used C# instead but this wouldn't be an option in other cases. It would be possible to make the DMX calls from C# objects and call those from Java but that's pretty labourious to code.
have SQL Server 2005 std edition SP1 installed on Windows 2003 Std edition .Configured Transactional (single Publisher and no clustered environment.) Replication past two months working fine, Now 1.Distrib.exe application err is coming.
Due to which my job is failing (Distributor to Subscriber). Iam attaching thw file. Thanks Sandeep
Anyone have any tips for using Java against SQL Server? Our ITdirector is thinking of making us a Java shop, but I really would liketo stay with SQL Server as our RDBMS. We have Oracle Financials butour in-house development (currently VB6 client-server, soon to bereplaced by a service-oriented architecture based around Sonic andincluding SalesForce, both of which are Java) has been against SQLServer. He says five years ago at his old company Java/SQL Server hadlousy performance. I vaguely remember that since then Microsoft cameout with their own JDBC driver for SQL Server... Anyone have experiencewith this? Any performance tips will be hugely appreciated.TIA
hi all and sorry for my englishI write into a SqlServer2000 database via jdbc using a PreparedStatement(pstmt) and one of fields is a TimeStamp, my code is:qwdum=System.currentTimeMillis();pstmt.setTimestamp(8 , new Timestamp(qwdum));sometimes the field on table is correct (the milliseconds are the same oflast 3 digits of variable qwdum), other times it has a difference of 1 o 2millisecondsthe same code with jdbc Oracle or iSeries works fineany idea?thanksRoberto Nenni
I am in the process of evalulating using SSRS with our Java app and I have a couple questions up front:
I see you can call SSRS thru web services and display an HTML report. Can you have the report go straight to the printer, rather then preview. So we can offer both Print and Print Preview options.
I see the page streaming option. So on page preview we could ask for page 1 to get a snappy display, then ask for the rest of the report to generate in background?
i want to use the sql server with java, but i don't find any documentation. I already loaded the sqljdbc.jar from the microsoft webpage, but i don't know how to connect.
This is my Connection function, but it doesn't connect. I get an exception like "cannot connect to ..."
Hello. I have just got windows xp profesional x64.When i am on the internett my jave does not open the programs and games.Can some one help me please.Thanks.
