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// **********************************************************************
//
// Copyright (c) 2003-2008 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
import Demo.*;
//
// This servant is a default servant. The book identity is retrieved
// from the Ice.Current object. The session object associated with the
// library is also retrieved using the Library's identity.
//
class LibraryI extends _LibraryDisp
{
public void
queryByIsbn(String isbn, BookDescriptionHolder first, BookQueryResultPrxHolder result, Ice.Current current)
throws NoResultsException
{
SessionI session = SessionI.getSession(current.id);
if(session == null)
{
// No associated session.
throw new Ice.ObjectNotExistException();
}
session.reapQueries();
SQLRequestContext context = SQLRequestContext.getCurrentContext();
assert context != null;
try
{
java.sql.PreparedStatement stmt = context.prepareStatement("SELECT * FROM books WHERE isbn LIKE ?");
stmt.setString(1, "%" + isbn + "%");
java.sql.ResultSet rs = stmt.executeQuery();
if(!rs.next())
{
throw new NoResultsException();
}
first.value = BookI.extractDescription(context, rs, current.adapter);
if(rs.next())
{
// The SQLRequestContext is now owned by the query
// implementation.
context.obtain();
BookQueryResultI impl = new BookQueryResultI(_logger, context, rs);
result.value = BookQueryResultPrxHelper.uncheckedCast(current.adapter.addWithUUID(impl));
session.add(result.value, impl);
}
}
catch(java.sql.SQLException e)
{
// Log the error, and raise an UnknownException.
error(e);
Ice.UnknownException ex = new Ice.UnknownException();
ex.initCause(e);
throw ex;
}
}
public void
queryByAuthor(String author, BookDescriptionHolder first, BookQueryResultPrxHolder result, Ice.Current current)
throws NoResultsException
{
SessionI session = SessionI.getSession(current.id);
if(session == null)
{
// No associated session.
throw new Ice.ObjectNotExistException();
}
session.reapQueries();
SQLRequestContext context = SQLRequestContext.getCurrentContext();
assert context != null;
try
{
// Find each of the authors.
java.sql.PreparedStatement stmt = context.prepareStatement("SELECT * FROM authors WHERE name LIKE ?");
stmt.setString(1, "%" + author + "%");
java.sql.ResultSet rs = stmt.executeQuery();
if(!rs.next())
{
throw new NoResultsException();
}
// Build a query that finds all books by these authors.
StringBuffer sb = new StringBuffer("SELECT * FROM books INNER JOIN authors_books ON " +
"books.id=authors_books.book_id AND (");
boolean front = true;
do
{
if(!front)
{
sb.append(" OR ");
}
front = false;
sb.append("authors_books.author_id=");
sb.append(rs.getInt("id"));
}
while(rs.next());
sb.append(")");
// Execute the query.
stmt = context.prepareStatement(sb.toString());
rs = stmt.executeQuery();
if(!rs.next())
{
throw new NoResultsException();
}
first.value = BookI.extractDescription(context, rs, current.adapter);
if(rs.next())
{
// The SQLRequestContext is now owned by the query implementation.
context.obtain();
BookQueryResultI impl = new BookQueryResultI(_logger, context, rs);
result.value = BookQueryResultPrxHelper.uncheckedCast(current.adapter.addWithUUID(impl));
session.add(result.value, impl);
}
}
catch(java.sql.SQLException e)
{
// Log the error, and raise an UnknownException.
error(e);
Ice.UnknownException ex = new Ice.UnknownException();
ex.initCause(e);
throw ex;
}
}
public BookPrx
createBook(String isbn, String title, java.util.List<String> authors, Ice.Current current)
throws BookExistsException
{
SQLRequestContext context = SQLRequestContext.getCurrentContext();
assert context != null;
try
{
java.sql.PreparedStatement stmt = context.prepareStatement("SELECT * FROM books WHERE isbn = ?");
stmt.setString(1, isbn);
java.sql.ResultSet rs = stmt.executeQuery();
if(rs.next())
{
throw new BookExistsException();
}
//
// First convert the authors string to an id set.
//
java.util.List<Integer> authIds = new java.util.LinkedList<Integer>();
java.util.Iterator<String> p = authors.iterator();
while(p.hasNext())
{
String author = p.next();
Integer id;
stmt = context.prepareStatement("SELECT * FROM authors WHERE name = ?");
stmt.setString(1, author);
rs = stmt.executeQuery();
if(rs.next())
{
// If there is a result, then the database
// already contains this author.
id = rs.getInt(1);
assert !rs.next();
}
else
{
// Otherwise, create a new author record.
stmt = context.prepareStatement("INSERT INTO authors (name) VALUES(?)",
java.sql.Statement.RETURN_GENERATED_KEYS);
stmt.setString(1, author);
int count = stmt.executeUpdate();
assert count == 1;
rs = stmt.getGeneratedKeys();
boolean next = rs.next();
assert next;
id = rs.getInt(1);
}
// Add the new id to the list of ids.
authIds.add(id);
}
// Create the new book.
stmt = context.prepareStatement("INSERT INTO books (isbn, title) VALUES(?, ?)",
java.sql.Statement.RETURN_GENERATED_KEYS);
stmt.setString(1, isbn);
stmt.setString(2, title);
int count = stmt.executeUpdate();
assert count == 1;
rs = stmt.getGeneratedKeys();
boolean next = rs.next();
assert next;
Integer bookId = rs.getInt(1);
// Create new authors_books records.
java.util.Iterator<Integer> q = authIds.iterator();
while(q.hasNext())
{
stmt = context.prepareStatement("INSERT INTO authors_books (book_id, author_id) VALUES(?, ?)");
stmt.setInt(1, bookId);
stmt.setInt(2, q.next());
count = stmt.executeUpdate();
assert count == 1;
}
// Commit the transaction.
context.commit();
return BookPrxHelper.uncheckedCast(current.adapter.createProxy(BookI.createIdentity(bookId)));
}
catch(java.sql.SQLException e)
{
// Log the error, and raise an UnknownException.
error(e);
Ice.UnknownException ex = new Ice.UnknownException();
ex.initCause(e);
throw ex;
}
}
LibraryI(Ice.Logger logger)
{
_logger = logger;
}
private void
error(Exception ex)
{
java.io.StringWriter sw = new java.io.StringWriter();
java.io.PrintWriter pw = new java.io.PrintWriter(sw);
ex.printStackTrace(pw);
pw.flush();
_logger.error("LibraryI: error:\n" + sw.toString());
}
private Ice.Logger _logger;
}
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