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reflect a mail thread that discussed our conformance (or lack thereof)
to the SQL92 spec.
Barry Lind
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attempt at a patch to 7.1.2 to support Array.
[I think I've solved the mangled patch problem. Hotmail seems to
try to format the text file, so gzipping it should solve this
problem.]
In this patch I've incorporated Barry's feedback. Specifically:
1) OIDs are no longer hard-coded into Array.java. In order to
support this change I added a getOID(String) method to Field.java
which receives a PostgreSQL field type and returns a value from
java.sql.Types. I couldn't get away from using OIDs altogether
because the JDBC spec for Array specifies that some methods return
a ResultSet. This requires I construct Field objects,
which means I need OIDs. At least this approach doesn't hard
code these values. A Hashtable cache has been added to Field
so that an SQL lookup isn't necessary (following the model already
in Field.java).
2) Rewired the base formatting code in ResultSet.java to use 'to'
methods, which are then exposed as static methods in ResultSet.
These methods are used in Array to format the data without
duplications in the code.
3) Artifact call to first() in ResultSet.getArray() removed.
Greg Zoller
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includes two changes in the JDBC driver:
1) When connected to a backend >= 7.2: use obj_description() and
col_description() instead of direct access to pg_description.
2) In DatabaseMetaData.getTables()/getColumns()/getProcedures():
when there is no comment on the object, return null in the
REMARKS column of the ResultSet, instead of the default string
"no remarks".
Change 2 first appeared as a side-effect of change 1, but it is
actually more compliant with the JDBC spec: "String object
containing an explanatory comment on the table/column/procedure,
which may be null". The default string "no remarks" was strictly
speaking incorrect, as it could not be distinguished from a real
user comment "no remarks". So I removed the default string
completely.
Change 2 might break existing code that doesn't follow the JDBC
spec and isn't prepared to handle a null in the REMARKS column
of getTables()/getColumns()/getProcedures.
Patch tested with jdbc2 against both a 7.1 and a CVS tip
backend. I did not have a jdbc1 environment to build and test
with, but since the touched code is identical in jdbc1 and jdbc2
I don't foresee any problems.
Regards,
Ren? Pijlman
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* Merges identical code from org.postgresql.jdbc[1|2].Statement into
org.postgresql.Statement.
* Moves escapeSQL() method from Connection to Statement (the only place
it's used)
* Minor cleanup of the new isolation level stuff.
* Minor cleanup of version string handling.
Anders Bengtsson
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Here is a context diff from latest cvs
And I see why you couldn't apply the last diff, the setCatalog diff has
been backed out, that was causing the compile problem in the first
place.
This following one needs to be applied to allow the current cvs to
compile
Dave Cramer
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1) improves performance of commit/rollback by reducing number of round
trips to the server
2) uses 7.1 functionality for setting the transaction isolation level
3) backs out a patch from 11 days ago because that code failed to
compile under jdk1.1
Details:
1) The old code was doing the following for each commit:
commit
begin
set transaction isolation level xxx
thus a call to commit was performing three round trips to the database.
The new code does this in one round trip as:
commit; begin; set transaction isolation level xxx
In a simple test program that performs 1000 transactions (where each
transaction does one simple select inside that transaction) has the
following before and after timings:
Client and Server on same machine
old new
--- ---
1.877sec 1.405sec 25.1% improvement
Client and Server on different machines
old new
--- ---
4.184sec 2.927sec 34.3% improvement
(all timings are an average of four different runs)
2) The driver was using 'set transaction isolation level xxx' at the
begining of each transaction, instead of using the new 7.1 syntax of
'set session characteristics as transaction isolation level xxx' which
only needs to be done once instead of for each transaction. This is
done conditionally (i.e. if server is 7.0 or older do the old behaviour,
else do the new behaviour) to not break backward compatibility. This
also required the movement of some code to check/test database version
numbers from the DatabaseMetaData object to the Connection object.
3) Finally while testing, I discovered that the code that was checked in
11 days ago actually didn't compile. The code in the patch for
Connection.setCatalog() used Properties.setProperty() which only exists
in JDK1.2 or higher. Thus compiling the JDBC1 driver failed as this
method doesn't exist. Thus I backed out that patch.
Barry Lind
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connection implementations (org.postgresql.jdbc[1|2].Connection) into
their superclass (org.postgresql.Connection).
It also changes the close() methods of Connection and PG_Stream, so that
PG_Stream no longer is responsible for sending the termination packet 'X'
to the backend. I figured that protocol-level stuff like that belonged in
Connection more than in PG_Stream.
Anders Bengtsson
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value for each column. Here is a context diff of CVS which should
fix it.
Jason Davies
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in Connection - note: I've updated setCatalog(String catalog) from my previous
diff so it checks whether it is already connected to the specified catalog.
Jason Davies
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Here's a patch against the current CVS. The changes from the previous
patch are mostly related to the changed interface for PG_Stream.
Anders Bengtsson
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null terminated strings. The FE/BE protocol sends in some cases null
terminated strings to the client. The docs for the FE/BE protocol state
that there is no limit on the size of a null terminated string sent to
the client and a client should be coded using an expanding buffer to
deal with large strings. The old code did not do this and gave an error
if a null terminated string was greater than either 4 or 8K. It appears
that with the advent of TOAST very long SQL statements are becoming more
common, and apparently some error messages from the backend include the
SQL statement thus easily exceeding the 8K limit in the old code.
In fixing I also cleaned up some calls in the JDBC fastpath code that
were not doing character set conversion under multibyte, and removed
some methods that were no longer needed. I also removed a potential
threading problem with a shared variable that was being used in
Connection.java.
Thanks to Steve Wampler for discovering the problem and sending the
initial diffs that were the basis of this patch.
thanks,
--Barry
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postgresql.res.badint, since that's the name in the properties file.
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* NULLs are sorted differently in 7.2
* table correlation names are supported
* GROUP BY, ORDER BY unrelated is supported since 6.4
* ESCAPE/LIKE only supported since 7.1
* outer joins only since 7.1
* preferred term for procedure is "function"
* preferred term for catalog is "database"
* supports SELECT for UPDATE since 6.5
* supports subqueries
* supports UNION; supports UNION ALL since 7.1
* update some of the max lengths to match reality
* rearrange some functions to match the order in the spec
for easier maintenance
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redirections between the build files, which didn't work completely. Now
you just go to the directory of your choice and run make. Clean up the
build files to have a logical order, fix the unnecessary rebuilds, prevent
the deleting targets from removing files they're not responsible for. Ant
1.3 does not have a bug. It deletes directories just fine if you follow
the documentation.
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misleading comments) from the PG_Stream class.
Anders Bengtsson
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object inside the initialization section instead of doing it everytime
the setTimestamp method is called. Thanks to Dave Harkness for this
suggestion.
Barry Lind
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the JDK 1.3 dependency. For a further explanation see my posting to the
JDBC list on Friday, explaining why this is being done.
Barry Lind
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Barry Lind
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Here is a patch which inspired by Michael Stephens that should work
Dave Cramer
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submit. These were done for the jdbc2 driver. The first one is for support
of the Types.BIT in the PreparedStatement class. The following lines need to be
inserted in the switch statment, at around line 530:
(Prepared statment, line 554, before the default: switch
case Types.BIT:
if (x instanceof Boolean) {
set(parameterIndex, ((Boolean)x).booleanValue() ? "TRUE" : "FALSE");
} else {
throw new PSQLException("postgresql.prep.type");
}
break;
The second one is dealing with blobs,
inserted in PreparedStatemant.java (After previous patch line, 558):
case Types.BINARY:
case Types.VARBINARY:
setObject(parameterIndex,x);
break;
and in ResultSet.java (Around line 857):
case Types.BINARY:
case Types.VARBINARY:
return getBytes(columnIndex);
Ned Wolpert <ned.wolpert@knowledgenet.com>
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Marko Kreen
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close();
}
in LargeObject.java so that the db resources are released when it is
garbage collected or am I missing something?
Philip Crotwell
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non-multibyte database loosing 8bit characters. This patch will cause
the jdbc driver to ignore the encoding reported by the database when
multibyte isn't enabled and use the JVM default in that case.
Barry Lind
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database, and often need the latest timestamp, but want to
format it as a date. With 7.0.x, I just
select ts from foo order by ts desc limit 1
and in java: d = res.getDate(1);
but this fails everywhere in my code now :(
http://java.sun.com/j2se/1.3/docs/guide/jdbc/spec/jdbc-spec.frame7.html
says
The ResultSet.getXXX methods will attempt to
convert whatever SQL type was returned by the
database to whatever Java type is returned by
the getXXX method.
Palle Girgensohn
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Dave Cramer
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driver now correctly handles timezones that are offset fractional hours
from GMT (ie. -06:30).
Barry Lind
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under Cygwin. The root cause of this problem is that (Sun) java is a
native Win32 app and hence does not understand Cygwin Posix style paths.
The solution is to use Cygwin's cygpath utility to convert the Posix style
JDBC installation directory path into a Win32 one before invoking ant.
I'm not sure if my patch is the best way to correct this issue but
my goal was to confine the Cygwin specific constructs to
Jason Tishler
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return oid on insert
handle all primitive data types
handle single quotes and newlines in Strings
handle null variables
deal with non public and final variables (not very
well, though)
Ken K
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errors.properties files were being copied.
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(1.22) of interfaces/jdbc/org/postgresql/jdbc2/ResultSet.java. That
change removed a line that set the variable s to the value of the
stringbuffer. This fix changes the following if checks to check the
length of the stringbuffer instead of s, since s no longer contains the
string the if conditions are expecting.
The bug manifests itself in getTimestamp() loosing the timezone
information of timestamps selected from the database, thereby causing
the time to be incorrect.
Barry Lind
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Here's what I came up with. The biggest difference api between JDK1.x and
later versions is the support for collections. The problem was with the
Vector class; in jdk1.x there is no method called add, so I changed the
calls to addElement. Also no addAll, so I rewrote the method slightly to not
require addAll. While reviewing this I notices some System.out.println
statements that weren't commented out. So I commented them out in both
versions.
The upshot of all of this is that I have clean compile, but no idea if the
code works ;(
Dave Cramer
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