Hi all,
I have a small doubt in the SQLExpression formed by the buildLike method. If
i understand the comments correctly if criteria = 50\%, it will be changed
to columnName = 50%
/**
* Takes a columnName and criteria and builds an SQL phrase based
* on whether wildcards are present and the state of the
* ignoreCase flag. Multicharacter wildcards % and * may be used
* as well as single character wildcards, _ and ?. These
* characters can be escaped with \.
*
* e.g. criteria = "fre%" -> columnName LIKE 'fre%'
* -> UPPER(columnName) LIKE UPPER('fre%')
* criteria = "50\%" -> columnName = '50%'
*
* @param columnName A column name.
* @param criteria The value to compare the column against.
* @param comparison Whether to do a LIKE or a NOT LIKE
* @param ignoreCase If true and columns represent Strings, the
* appropriate function defined for the database will be used to
* ignore differences in case.
* @param db Represents the database in use, for vendor specific
functions.
* @param whereClause A StringBuffer to which the sql expression
* will be appended.
*/
static void buildLike(String columnName,
String criteria,
SqlEnum comparison,
boolean ignoreCase,
DB db,
StringBuffer whereClause)
{
Check the loop logic below - first sb is filled with *5 *and then *0 *and
then it encounters \ - the code now enters the *case BACKSLASH: *where we
check the next character while is % so it enters the % case and so the
position gets incremented by 1 automatically - the checkWildcard at this
time will be still \ and not % and so when the checkWildcard gets appended
to sb we will be appending \ and we would have skipped % altogether (because
of position++)
At the end of the loop we will be having sb= 50\ and not 50%. Is this a
bug??
Most of time we may not have faced the problem because we would have come in
criteria = 50\\% (because of *quoteAndEscapeText() *method appending an
extra slash for most dbs).
StringBuffer sb = *new* StringBuffer();
* StringBuffer sb = new StringBuffer();
while (position < criteria.length())
{
char checkWildcard = criteria.charAt(position);*
* switch (checkWildcard)
{
case BACKSLASH:
// Determine whether to skip over next character.
switch (criteria.charAt(position + 1))
{
case '%':
case '_':
case '*':
case '?':
case BACKSLASH:
position++;
break;
}
break;
case '%':
case '_':
escapeCharFound = true;
equalsOrLike = comparison.toString();
break;
case '*':
equalsOrLike = comparison.toString();
checkWildcard = '%';
break;
case '?':
equalsOrLike = comparison.toString();
checkWildcard = '_';
break;
}*
* sb.append(checkWildcard);
position++;
}
whereClause.append(equalsOrLike);*
sb.append(checkWildcard);
position++;
}
Thanks,
*T.Parthasarathy *• SunGard • Offshore Services • Divyasree Chambers
Langford Road • Bangalore 560025 India
Tel +91-80-2222-0501 • Mobile +91-99450-00394 • Fax +91-80-2222-0511 • *
www.sungard.com*
*Please note my email address –
[EMAIL PROTECTED] Please update your
contact list and use this address for all
future communication.*
CONFIDENTIALITY: This email (including any attachments) may contain
confidential, proprietary and privileged information, and unauthorized
disclosure or use is prohibited. If you received this email in error, please
notify the sender and delete this email from your system. Thank you.
