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duplicate entry for key
Posted by: abhi mahajan
Date: July 24, 2010 07:14AM

hi 2 every1,

i created a table 'empp' with 4 fields starting with 'eid', 'uname', 'password', 'first_name'. i made 'eid' as auto-increment nd assigned primary key to it. 'uname' is set as unique nd first_name is set as default.
nw i made a java swing application with jdbc incorporated in it. i tried to insert values through java application nd i m facing two problems. the insert command is as follows:

"insert into empp (uname,password,first_name) values ('lambda','hello','abhi')";

notice that i skipped the eid column as it is auto incremented. so the problems:

1. after filling the entries in java application and after successful entry in table, i get an exception message after closing application as:
"exception occurs : duplicate entry 'lambda' for key 2"
this whole entry is successfully inserted into table. so what is the meaning of 'duplicate entry' nd why is it happening??

2. suppose i inserted a row in table through application, after successful entry in table i get an new eid as 106 (say), means that last entry of table had eid content as 105. nw if i delete this account i.e. with eid as 106 and then re-enter new values in table, i get the new eid as 107 instead of 106 which ws deleted previously. why is this happening nd what could be done to avoid this??

thanx in advance

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duplicate entry for key
July 24, 2010 07:14AM

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