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Re: InstantDB: Apparent bug in CHAR(255) reported length


Hey Chad,

I have not tested if this works for a VARCHAR column, but I have used
getColumnDisplaySize (int column) on the
ResultSetMetaData of a given ResultSet with succes, hope this is to some help.




Martin






Chad Loder <cloder@acm.org> on 12-05-2000 07:26:57

Please respond to instantDB@enhydra.org

To:   instantdb@enhydra.org
cc:
Subject:  InstantDB: Apparent bug in CHAR(255) reported length



Hello. When I execute the following statement to create a database:

CREATE TABLE pslogdat (
    log_id_high INTEGER NOT NULL ,
    log_id_low INTEGER NOT NULL ,
    log_seq BYTE NOT NULL ,
    log_subt INTEGER NOT NULL ,
    log_subseq BYTE NOT NULL ,
    log_data VARCHAR(255),
    primary key (log_id_high, log_id_low, log_seq, log_subseq))

Then I use the following code to catalog the column length:

DatabaseMetaData dmd = conn.getMetaData();
ResultSet drs = dmd.getColumns("", null, "pslogdat", "log_data");
if (drs != null)
{
    if (drs.next())
    {
       String colName = drs.getString(4);
       int maxData = drs.getInt(7);
       System.out.println("Length of " + colName + " is " + maxData);
    }
}

The output I get is:

"Length of log_data is 65536".

The JDBC documentation states that the COLUMN_SIZE column (7)
is the maximum number of characters when the column in question
is a char or date type. Shouldn't the database be returning 255
here? Is this a bug, and if so, is there a workaround?

Thanks,

    Chad (wishing I had the source code so I could debug this)
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