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I have a some trouble about my own simple android project. I save data pair (key-value), and I dont want to save same data. ( for example: I save the data "Car"- "Blue" once. and then application can not permisson save again same the data.) I wrote already update method but I couldnt use for search & control data repetition. How can I solve ?
Make the combination of the two columns a Primary Key
You can also use if else block along with SELECT statement to validate inputs.
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00000182 SystemOut O ==== Inside updateValidation exceptionStackTrace = com.ibm.db2.jcc.am.SqlIntegrityConstraintViolationException: DB2 SQL Error: SQLCODE=-803, SQLSTATE=23505, SQLERRMC=XHAZMAT1;000098D401, DRIVER=4.21.29
You can try checking for any SQL constraints like indexes with name - XHAZMAT1 on the table you are updating.
You can check for the SQL error message SQLERRMC in the console which is throwing update validation error. Seems like you are updating a record in database that is having any constraints related to indexes etc.
Also, you can look for XHAZMAT1 on the table you are updating.
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I am writing a report generation program in Java, with oracle DB. I have a stored procedure, that will retrieve one value at a time. From my Java Program I am calling the procedure repeatedly. In extreme case, I have to call the procedure 60,000 times. But it shows problems like, wrong value is returned after a specified calls (like 300 calls). kindly tell me how to sort out this.
Thanks.
Its not a good practice to call DB with such high frequency. You can use cursor in your stored procedure and fetch the required records at once. Check the link for reference Cursors in Oracle Stored Procedure
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So there will be a text field that I disable using the textField.setEnabled(false) method. However later on in the code I want to enable this text field back again. textField.setEnabled(true) does not work at this moment.
How should I address this problem?
Try to create a Jtextfield like instance variables
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String query = "select * from table where word='سیب'";
unicodes works fine in java but not fetching values from database
i don't know what's the problem :(
thanks in advance
Check if your database configuration is supporting UTF-16.
What happens executing the query on a database client instead from java code?
Your problem is that a given string is not matched in the database, even though you have the value stored. I believe your problem is as follows: you are using different character sets in your application from your database. You should either change the character set in one of those or you should convert the string into the character set used at the db before you run your query.
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I have near about 1 million entries in my database table and
I need to use some logic by which I can search within minimum time,
is there any algorithms or logic by which i can get result within less time.
I tried sorting table alphabetically but till it is taking much more time.
If you have any algorithm or logic then please suggest code in Java.
Looks like you need to ad in index to your database table.
If you tell what database you are using, people can give more specific help.
It dosent matter how much records you have as long as your databse is properly normalised and is having proper index. Having said that, the only difference that will make is how you are using indexes. You cannot do much in java, but your db and its design will play a significant role.