exception

i set the field to unique in mysql database.
when i input data into the field, the alert message shown in mysql: can't insert duplicate value for that field.

but when i input same data in that field from jsp and then submit form
i would like to ask why the code don't fall to exception as i use
try{

update sql statement here...
return "updated";
}
catch(exception e){
return e.toString();
}

but actually, the data has not been updataed.
but can't fall to exception area?

why?

Li Jenny wrote:
i would like to ask why the code don't fall to exception as i use
try{

update sql statement here...
return "updated";
}
catch(exception e){
return e.toString();
}

but actually, the data has not been updataed.
but can't fall to exception area?

how do you say that it is not falling into catch block? put System.out.println("INFO:cool! i am here") this as a first statement in catch . and let me know

<edit>by the way : dont you get compilation error on catch[catch(exception e)] . remember, java is case sensitive</edit>

Jenny, please UseCodeTags when you post source code on JavaRanch.
Moving to JDBC.

Please UseAMeaningfulSubjectLine when posting. Explaining your question or remark briefly on the subject line allows us to know what we are getting into, and if we will be able to help. Taking the time to compose a useful subject line shows that you care enough about your question to ShowSomeEffort when asking it here.