static void loadTraceProperties() {
// The following section is new
// Load and apply the JDBC Server Trace value.
String value = SystemProperties.getProperty(SystemProperties.TRACE_JDBC_SERVER);
if (value != null) {
try {
JDBCServerTraceCategories_ = (new Integer(value)).intValue();
} catch (Exception e) {
if (JDTrace.isTraceOn())
JDTrace.logInformation(
"ServerTrace", "Value " + value + " for JDBCServerTrace is not valid.");
}
}
}
/**
* Returns part of the contents of the CLOB.
*
* @param position The position within the CLOB (1-based).
* @param length The number of characters to return.
* @return The contents.
* @exception SQLException If the position is not valid, if the length is not valid, or an error
* occurs.
*/
public String getSubString(long position, int length) throws SQLException {
if (locator_ == null) // @free
JDError.throwSQLException(this, JDError.EXC_FUNCTION_SEQUENCE); // @free
synchronized (locator_) {
int offset = (int) position - 1;
if (offset < 0 || length < 0 || (offset > length())) {
JDError.throwSQLException(this, JDError.EXC_ATTRIBUTE_VALUE_INVALID);
}
int lengthToUse = (int) length() - offset;
if (lengthToUse < 0) return "";
if (lengthToUse > length) lengthToUse = length;
// @xml4 if xml column, remove xml declaration via ConvTableReader
if (isXML_) {
ConvTableReader r = null;
try {
r =
new ConvTableReader(
new AS400JDBCInputStream(locator_),
converter_.getCcsid(),
converter_.bidiStringType_,
isXML_); // @xml4
r.skip(offset); // @xml4 ConvTableReader will already have skipped XML header if column is
// XML type
return r.read(lengthToUse); // @xml4
} catch (Exception e) {
JDError.throwSQLException(this, JDError.EXC_INTERNAL, e);
return null;
} finally {
try {
if (r != null) r.close();
} catch (Exception ee) {
JDTrace.logException(this, "getSubString r.close() threw exception", ee);
}
}
}
DBLobData data = locator_.retrieveData(offset, lengthToUse);
int actualLength = data.getLength();
return converter_.byteArrayToString(data.getRawBytes(), data.getOffset(), actualLength);
}
}
