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how to clear blob column cell in MySQL without remove complete row in the data table and what is the default value in MySQL blob data type ?
From 11.4.3. The BLOB and TEXT Types:
BLOB and TEXT columns cannot have DEFAULT values.
Thus, if the column is NULLABLE then NULL is the default; otherwise there is no default value. (Although, at the application level, a blob of length=0 might be a sensible "default".)
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I am writing a java program for fingerprint recognition, and I insert the fingerprint image in the MySQL database( in a field blob), but now is the problem.
How do I go back to the image of the fingerprint? where I have to print it?( I presume in a canvas). help me please is very important, thanks to all.
The blob is a array of bytes, so is the Image.
So
img -> read bytes -> store as blob
vs
blob -> read bytes -> store as img
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I would say I'm a newbie in programming and I need to store some data on an Id.
And then get the right data to an Id.
How can I do this?
Have you heard about Map and its Implementation. It stores the value in (Key,Value) pair.
Read this.
You can use your id as a key and its value in Map. and retrieve it using id easily.
if you need to store data in ID in android u flallow [http://developer.android.com/guide/topics/manifest/meta-data-element.html]
then you get the result
(or)
Cheak this link : (Canvas, animated text rotation)
Use HashMap. it key value date structure and stores data on the basis of id
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I have below string which I get from an xml file.
<product>
<aa>1367</aa>
<ac>133787</ac>
<db>13345</db>
<ce>133</ce>
<er>135</er>
<et>130</et>
<ef>14</ef>
</product>
How do I convert it to an two dimension array like
product[][]={{"aa", "1367"},{"ac","133787"}, {"db","13345"}....}
I only want to use string function and loop.
I think the best way is to use an available XML parser.
In this thread: Best XML parser for Java you'll probably find which one is the best to use
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I was developing an java swing application to add view and modify the list of medicines.While adding the medicines it should show the list from the database(like google search box).For example if we press "p" it should show 'paracetamol' from the database.
You should implement a change listener on the text input box, when the text is changed, run a query to the database with the contents of the input box.
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In my project I am supposed to read a CSV file which contains a number of rows
and append to each row.
Can anyone please let me know how to append to the row of file in Java programming?
for example, if my csv file contains data as
hi,hello,how
please,help,me
i want to append after "how" and nothing in the file should be altered..
Appending a row in a CSV file, is basically inserting text at a specified location in the file. However, you can not simply insert data into a file, you have to read , modify the data and then writeto a new file in the new format. If you attempt to insert data into an existing file, the data in this place will be overwritten.