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java.sql.*

Posted on 1999-07-14
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Last Modified: 2010-04-16
i need to delete all information in my table.  how do i go about doing that?

stmt.executeUpdate("DELETE * FROM TableName");  ???
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Question by:capnjazz
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5 Comments
 

Accepted Solution

by:
rkrenek earned 80 total points
ID: 1246059
capnjazz,
You're close. Try:
stmt.executeUpdate("DELETE FROM TableName");
then you can do:
int updates = stmt.getUpdateCount();
to get the number deleted.
If you want to delete specific rows you would add a 'WHERE' clause to the end of your sql statement like:
stmt.executeUpdate("DELETE FROM TableName WHERE column1 = 'something'");

rkrenek
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Expert Comment

by:sankars98
ID: 1246060

 yes you are correct and after that you have to
 call "commit()" of Connection object.
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Author Comment

by:capnjazz
ID: 1246061
well i had just "DELETE FROM TableName", but it threw an exception?
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Author Comment

by:capnjazz
ID: 1246062
System.out.println("Transmitter");
stmt.executeUpdate("DELETE FROM Transmitter");
System.out.println("Deleted Transmitter");

stmt.executeUpdate("INSERT INTO Transmitter VALUES (10, 'Washington Avenue',  'transmitting routine messages', '9,301-464-6824', '12345', '', 'I-279', 'Allegheny', '11', 'dxxxB1C1', '')");
stmt.executeUpdate("INSERT INTO Transmitter VALUES (20, 'Carson Street',      'transmitting routine messages', '9,301-464-3756', '98765', '', 'I-279', 'Allegheny', '11', 'dxxxB1C1', '')");
stmt.executeUpdate("INSERT INTO Transmitter VALUES (40, 'Main Street',        'failed',                        '9,410-922-0090', '68734', 'Transmitter fell down when bionic beaver thought pole was a tree and chewed through it.', 'I-79', 'Butler', '12', 'dxxxB1C2', '07/04/99 08:30')");

i don't get to "Deleted Transmtter".
i checked and i do have one entry in the table.
0
 

Expert Comment

by:rkrenek
ID: 1246063
try:
try {
      boolean status = stmt.execute("DELETE FROM             transmitter");
      if (!status) {
            System.out.println("Deleted Transmitter");
      }
} catch (SQLException e)  {
      System.err.println("SQLExcepton: " + e.getMessage() + ":" +e.getSQLState());
}      

The sql above is correct.
Above will do an update or query, if it was an update it will print "Deleted Transmitter". If there is an error it will print it out. Some problems might be the user that is running this may not be able to delete records from that table. Hope this gets you closer to your problem.

rkrenek
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