public void process(XPathContext context) throws XPathException {
// Prepare the SQL statement (only do this once)
Controller controller = context.getController();
Item conn = arguments[CONNECTION].evaluateItem(context);
if (!(conn instanceof ObjectValue
&& ((ObjectValue) conn).getObject() instanceof Connection)) {
DynamicError de =
new DynamicError("Value of connection expression is not a JDBC Connection");
de.setXPathContext(context);
throw de;
}
Connection connection = (Connection) ((ObjectValue) conn).getObject();
String dbCol = arguments[COLUMN].evaluateAsString(context);
String dbTab = arguments[TABLE].evaluateAsString(context);
String dbWhere = arguments[WHERE].evaluateAsString(context);
NamePool pool = controller.getNamePool();
int rowCode = pool.allocate("", "", rowTag);
int colCode = pool.allocate("", "", colTag);
PreparedStatement ps = null;
ResultSet rs = null;
DynamicError de = null;
try {
StringBuffer statement = new StringBuffer();
statement.append("SELECT " + dbCol + " FROM " + dbTab);
if (dbWhere != "") {
statement.append(" WHERE " + dbWhere);
}
// System.err.println("-> SQL: " + statement.toString());
// -- Prepare the SQL statement
ps = connection.prepareStatement(statement.toString());
controller.setUserData(this, "sql:statement", ps);
// -- Execute Statement
rs = ps.executeQuery();
// -- Print out Result
Receiver out = context.getReceiver();
String result = "";
int icol = rs.getMetaData().getColumnCount();
while (rs.next()) { // next row
// System.out.print("<- SQL : "+ rowStart);
out.startElement(rowCode, StandardNames.XDT_UNTYPED, locationId, 0);
for (int col = 1; col <= icol; col++) { // next column
// Read result from RS only once, because
// of JDBC-Specifications
result = rs.getString(col);
out.startElement(colCode, StandardNames.XDT_UNTYPED, locationId, 0);
if (result != null) {
out.characters(result, locationId, options);
}
out.endElement();
}
// System.out.println(rowEnd);
out.endElement();
}
// rs.close();
if (!connection.getAutoCommit()) {
connection.commit();
}
} catch (SQLException ex) {
de = new DynamicError("(SQL) " + ex.getMessage());
de.setXPathContext(context);
throw de;
} finally {
boolean wasDEThrown = (de != null);
if (rs != null) {
try {
rs.close();
} catch (SQLException ex) {
de = new DynamicError("(SQL) " + ex.getMessage());
de.setXPathContext(context);
}
}
if (ps != null) {
try {
ps.close();
} catch (SQLException ex) {
de = new DynamicError("(SQL) " + ex.getMessage());
de.setXPathContext(context);
}
}
if (!wasDEThrown && de != null) {
throw de; // test so we don't lose the real exception
}
}
}
