Bug #1130 Clob truncate fails
Submitted: 25 Aug 2003 3:00 Modified: 25 Aug 2003 7:42
Reporter: Roland Littwin Email Updates:
Status: Closed Impact on me:
Category:Connector / J Severity:S2 (Serious)
Version:3.0.8 OS:Any (All)
Assigned to: Mark Matthews CPU Architecture:Any

[25 Aug 2003 3:00] Roland Littwin
JDBC Documentation said
public void truncate(long len)
              throws SQLExceptionTruncates the CLOB value that this Clob designates to have a length of len characters.

but your implementation in file com/mysql/jdbc/Clob.java sets the Clob to
the tailing string after the length-Position. So truncating a clob to 0 bytes
clob.truncate(clob.length()) and not clob.truncate(0). If im wrong, i'm sorry
but I think I'm right.

How to repeat:
clob.truncate(0) to a nonemty field and store result. It will be unchanged.

Suggested fix:
Your version:
   public void truncate(long length) throws SQLException {
        this.charData = this.charData.substring((int) length);

Corrected version:
    public void truncate(long length) throws SQLException {
        this.charData = this.charData.substring(0,(int) length);
[25 Aug 2003 7:42] Mark Matthews
Thank you for your bug report. This issue has been committed to our
source repository of that product and will be incorporated into the
next release.

If necessary, you can access the source repository and build the latest
available version, including the bugfix, yourself. More information 
about accessing the source trees is available at