question on swings i.e delete button

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smart - 18 Apr 2008 08:33 GMT

Hello, Good Morning every one i am new to work with swings i am facing
problem with delete button.

In an application i kept a button Delete . For delete button i have
taken ShowConfirmDialog i.e YES_NO_OPTION.

When i press YES it is deleting record which is correct. But when i
press NO button it is deleting record which is not happen. I used for
delete query is like this

[ pstmtdel=con.prepareStatement("delete from ICLASS where
Sno='"Sno"'"); ]

[ pstmtdel.executeUpdate();]

And try with if condition also when i put query in if condition it's
showing an error .

Error is variable pstmtdel might not have been initialized

So, how can solve this one. Help me regarding this topic

Thanks

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Jan Thomä - 18 Apr 2008 08:49 GMT

> [ pstmtdel=con.prepareStatement("delete from ICLASS where
> Sno='"Sno"'"); ]
[quoted text clipped - 5 lines]
>
> Error is variable pstmtdel might not have been initialized

Please provide the full code snippet you are referring to. I see no "if"
condition in the code snippet you provided, therefore it is impossible to
find out what your problem is.

Jan

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Lew - 18 Apr 2008 12:43 GMT

smart wrote:

>> [ pstmtdel=con.prepareStatement("delete from ICLASS where
>> Sno='"Sno"'"); ]
[quoted text clipped - 5 lines]
>>
>> Error is variable pstmtdel might not have been initialized

Apparently you only set the variable down one path of the branch, and not the
other.

'pstmtdel' is a variable name that violates the naming convention. Word parts
are supposed to begin with upper-case letters, except for the very first
letter, which is lower case, hence, 'pStmtDel'. This is called "camel case",
often spelled "camelCase" to emphasize why.

What does the initial 'p' stand for? Variable names are supposed to be
meaningful, in the context of the problem domain.

> Please provide the full code snippet you are referring to. I see no "if"
> condition in the code snippet you provided, therefore it is impossible to
> find out what your problem is.

Also, OP, answer this, what is "swings"?

There is a GUI library in Java called "Swing". Perhaps that's what you meant.

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Lew

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question on swings i.e delete button

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