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.

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Mar 27, 2006

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.

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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 ?

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Hey all,
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Can someone point me to a good source for executing java applications from a stored procedure?

Thanks in advance ...
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May 27, 2007

Hello, Everybody.



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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:

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Can not think out what to do else. Maybe somebody knows what to do about it?

Many thanks

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Jul 20, 2005

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Apr 7, 2008

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Mar 28, 2007

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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
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Oct 14, 2006

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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.

Thank you

Kenn Kikkenborg

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Oct 14, 2006

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)
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Thank you

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May 20, 2008

Hello,

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:

Sec / Actual Rows Returned
0 0
10 237
20 447
30 481
40 585
50 655
60 725
70 793
80 860
90 940
100 1013
110 1081
120 1115
130 1151
140 1217
150 1250
160 1325
170 1325
180 1430
190 1467
200 1502
210 1539
220 1574
230 1610
240 1645
250 1679
260 1715
270 1750
280 1787
290 1822
300 1857
310 1892
320 1923
330 1956
340 1988
350 1988
360 2022
370 2060
380 2094
390 2094
400 2130
410 2160
420 2209
430 2237
440 2237
450 2274
460 2274
470 2308
480 2342
490 2380
500 2380
510 2418
520 2418
530 2451
540 2480
550 2493
560 2531
570 2566

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, ...)
{

ArrayList item = (ArrayList) obj;


col1 = item.Count > 0 ? (string) item[0] : "";
col2 = item.Count > 0 ? (string) item[1] : "";
col3 = item.Count > 0 ? (string) item[2] : "";
[...]
}

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.

Thanks,

Dragan Radovic

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Hi

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I tried

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Hi!

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int codePage = 950;
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Encoding targetEncoding = Encoding.GetEncoding(codePage);
byte[] encodedChars= targetEncoding.GetBytes(str);
.
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