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From: Peter T Mount <patches@maidast.demon.co.uk>

Browse Source 
[This is a repost - it supercedes the previous one. It fixes the patch so
it doesn't bread aix port, plus there's a file missing out of the
original post because difforig doesn't pick up new files. It's now
attached. peter]

This patch brings the JDBC driver up to the current protocol spec.
Basically, the backend now tells the driver what authentication scheme to
use.

The patch also fixes a performance problem with large objects. In the
buffer manager, each fastpath call was sending multiple Notifications to
the backend (sometimes more data in the form of notifications were being
sent than blob data!).
This commit is contained in:
Marc G. Fournier
1998-02-02 13:17:01 +00:00
parent 67c92f423a
commit 4e9dd95296
7 changed files with 214 additions and 76 deletions
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42
src/interfaces/jdbc/postgresql/PG_Stream.java
View File

@ -76,6 +76,8 @@ public class PG_Stream
* This is required when the backend uses the routines in the
* src/backend/libpq/pqcomprim.c module.
*
* As time goes by, this should become obsolete.
*
* @param val the integer to be sent
* @param siz the length of the integer in bytes (size of structure)
* @exception IOException if an I/O error occurs
@ -139,6 +141,17 @@ public class PG_Stream
}
}
/**
* Sends a packet, prefixed with the packet's length
* @param buf buffer to send
* @exception SQLException if an I/O Error returns
*/
public void SendPacket(byte[] buf) throws IOException
{
SendInteger(buf.length+4,4);
Send(buf);
}
/**
* Receives a single character from the backend
*
@ -186,6 +199,33 @@ public class PG_Stream
return n;
}
/**
* Receives an integer from the backend
*
* @param siz length of the integer in bytes
* @return the integer received from the backend
* @exception SQLException if an I/O error occurs
*/
public int ReceiveIntegerR(int siz) throws SQLException
{
int n = 0;
try
{
for (int i = 0 ; i < siz ; i++)
{
int b = pg_input.read();
if (b < 0)
throw new IOException("EOF");
n = b | (n << 8);
}
} catch (IOException e) {
throw new SQLException("Error reading from backend: " + e.toString());
}
return n;
}
/**
* Receives a null-terminated string from the backend. Maximum of
* maxsiz bytes - if we don't see a null, then we assume something
@ -253,7 +293,7 @@ public class PG_Stream
answer[i] = null;
else
{
int len = ReceiveInteger(4);
int len = ReceiveIntegerR(4);
if (!bin)
len -= 4;
if (len < 0)