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Thu Jan 18 12:24:00 GMT 2001 peter@retep.org.uk

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- These methods in org.postgresql.jdbc2.ResultSet are now implemented:
            getBigDecimal(int) ie: without a scale (why did this get missed?)
            getBlob(int)
            getCharacterStream(int)
            getConcurrency()
            getDate(int,Calendar)
            getFetchDirection()
            getFetchSize()
            getTime(int,Calendar)
            getTimestamp(int,Calendar)
            getType()
          NB: Where int represents the column name, the associated version
              taking a String were already implemented by calling the int
              version.
        - These methods no longer throw the not implemented but the new noupdate
          error. This is in preparation for the Updateable ResultSet support
          which will overide these methods by extending the existing class to
          implement that functionality, but needed to show something other than
          notimplemented:
            cancelRowUpdates()
            deleteRow()
        - Added new error message into errors.properties "postgresql.noupdate"
          This is used by jdbc2.ResultSet when an update method is called and
          the ResultSet is not updateable. A new method notUpdateable() has been
          added to that class to throw this exception, keeping the binary size
          down.
        - Added new error message into errors.properties "postgresql.psqlnotimp"
          This is used instead of unimplemented when it's a feature in the
          backend that is preventing this method from being implemented.
        - Removed getKeysetSize() as its not part of the ResultSet API

Thu Jan 18 09:46:00 GMT 2001 peter@retep.org.uk
        - Applied modified patch from Richard Bullington-McGuire
          <rbulling@microstate.com>. I had to modify it as some of the code
          patched now exists in different classes, and some of it actually
          patched obsolete code.

Wed Jan 17 10:19:00 GMT 2001 peter@retep.org.uk
        - Updated Implementation to include both ANT & JBuilder
        - Updated README to reflect the changes since 7.0
	- Created jdbc.jpr file which allows JBuilder to be used to edit the
          source. JBuilder _CAN_NOT_ be used to compile. You must use ANT for
          that. It's only to allow JBuilders syntax checking to improve the
          drivers source. Refer to Implementation for more details
This commit is contained in:
Peter Mount
2001-01-18 14:50:15 +00:00
parent 89ac643964
commit 45b5d792af
25 changed files with 1459 additions and 550 deletions
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129
src/interfaces/jdbc/Implementation
View File

@@ -1,28 +1,87 @@
This short document is provided to help programmers through the internals of
the PostgreSQL JDBC driver.
Last update: January 17 2001 peter@retep.org.uk
build.xml
---------
As of 7.1, we now use the ANT build tool to build the driver. ANT is part of
the Apache/Jakarta project, and provides far superior build capabilities. You
can find ANT from http://jakarta.apache.org/ant/index.html and being pure java
it will run on any java platform.
So far I've tested it under JDK1.2.x & JDK1.3 (both Linux & NT) but not yet with
JDK1.1.8. Because of the latter the Makefile still works for now, but should be
gone for 7.2.
Anyhow, to build, simply type ant and the .jar file will be created and put into
the jars directory.
Tip: If you run ant from the sources root directory (ie: where the configure
script is located) you will find another build.xml file. It is advised to run
ant from that directory as it will then compile some auxilary Java/JDBC
utilities that are located under the /contrib/retep directory.
Makefile
--------
All compilation must be done by using Make. This is because there are two
versions of the driver, one for JDBC1 (for JDK 1.1.x) and the other for JDBC2
(for JDK 1.2 or later). The makefile determines which version to compile by
using a helper class makeVersion. This class is only used by make, and is not
stored in the Jar file.
Prior to 7.1, all compilation must be done by using Make. This is because there
are three versions of the driver, one for JDBC1 (for JDK 1.1.x) and the others
for JDBC2 (for JDK 1.2 or later, one standard and one enterprise).
Note: It is not sufficient to simply call javac on postgresql/Driver.java as
some classes are dynamically loaded, so javac will not compile them.
As of 7.1, ANT is the build tool of choice. Just compare Makefile and build.xml
to see why! Make just isn't suited to Java.
Building with just the JDK
--------------------------
This is not advised, simply because you have to make sure you include the
correct classes, and the fact that org.postgresql.Driver is built on the fly.
Also, javac won't pick up all the classes because some (org.postgresql.geometric
for example) are loaded dynamically.
org/postgresql/Driver.java.in
-----------------------------
Because there are three versions of the driver, the org.postgresql.Driver class
is built dynamically. To build correctly ANT copies the Driver.java.in file to
Driver.java replacing certain values according to the required driver.
The replaced values are of the format %VALUE%, ie: %MAJORVERSION% is replaced
with 7 in the 7.1 version of the driver.
postgresql.jar
--------------
This jar file is produced by make, and contains the driver for your JDK
platform.
This jar file is produced by ANT, and contains the driver for your JDK platform.
Note: It is possible to compile the driver under say JDK1.1.7, then under
JDK 1.2. Because make doesn't remove the old classes before compiling,
jar will simply package both sets together. When the driver is loaded,
the postgresql.Driver class will sort out which set of classes to use.
If you downloaded a precompiled binary from the web, you may find that the
jar file will be named differently. These are identical to this file but are
named according to the backend and jdk versions.
The naming convention is of the form: jdbc-#.#-#.##.jar
ie: for 7.1
jdbc-7.1-1.1.jar JDBC Driver for JDK1.1.8
jdbc-7.1-1.2.jar JDBC Driver for JDK1.2 & JDK1.3
jdbc-7.1-1.2ent.jar JDBC Driver for JDK1.2 & JDK1.3 Enterprise Editions
If in the future there are any 1.3 specific classes then there will be two new
jar files.
Note: All the precompiled binaries are built under Linux.
jdbc.jpx
--------
This is a JBuilder4 project file. It's here to allow JBuilder to be used to
develop the driver. Mainly for it's Editor's features like syntax checking and
auto-completion etc.
IMPORTANT: You CAN NOT build the driver from within JBuilder. You must use ANT.
This is because of the three versions of the JDK. If you try to use
JBuilder, it will try to build everything, and it will just not work.
Importing packages
------------------
@@ -50,16 +109,17 @@ Package Layout
The driver is split into several packages:
postgresql core classes, common to both JDBC 1 & 2
postgresql.jdbc1 classes used only in implementing JDBC 1
postgresql.jdbc2 classes used only in implementing JDBC 2
postgresql.fastpath FastPath to backend functions
postgresql.geometric 2D Geometric types mapped to Java Objects
postgresql.largeobject Low level Large Object access
postgresql.util Utility classes
org.postgresql core classes that can be accessed by user code
org.postgresql.core core classes not normally used externally
org.postgresql.jdbc1 classes used only in implementing JDBC 1
org.postgresql.jdbc2 classes used only in implementing JDBC 2
org.postgresql.fastpath FastPath to backend functions
org.postgresql.geometric 2D Geometric types mapped to Java Objects
org.postgresql.largeobject Low level Large Object access
org.postgresql.util Utility classes
Package postgresql
Package org.postgresql
------------------
This package holds the core classes.
@@ -70,6 +130,9 @@ Driver registers the driver when it's loaded, and determines which
Field Used internally to represent a Field
PG_Stream Used internally to manage the network stream.
PostgresqlDataSource
Exists in the Java2 Enterprise edition driver only and is the
enterprise equivalent to Driver
These classes contains common code that is not dependent to the
two JDBC specifications.
@@ -77,13 +140,25 @@ PG_Stream Used internally to manage the network stream.
Connection Common code used in Connections, mainly Network Protocol stuff.
ResultSet Common code used in ResultSet's
Package postgresql.fastpath
Package org.postgresql.core
-----------------------
New in 7.1, this is where core classes (common to all versions) will exist. Any
new class that would have gone into org.postgresql must go in here instead.
BytePoolDim1 Handles a pool of byte[] arrays.
BytePoolDim2 Handles a pool of byte[][] arrays
MemoryPool Interface for managing MemoryPools. Not used (yet).
ObjectPool Interface for an Object Pool
SimpleObjectPool Class that implements ObjectPool and used by BytePoolDim#
Package org.postgresql.fastpath
---------------------------
Fastpath Handles executing a function on the PostgreSQL Backend
FastpathArg Defines an argument for a function call
Package postgresql.geometric
Package org.postgresql.geometric
----------------------------
PGbox Maps to postgresql type box
@@ -94,25 +169,25 @@ PGpath Maps to postgresql type path
PGpoint Maps to postgresql type point
PGpolygon Maps to postgresql type polygon
Package postgresql.jdbc1
Package org.postgresql.jdbc1
------------------------
The classes in this package handle the JDBC 1 Specification, for JDK 1.1.x
All interfaces in the java.sql package are present here.
Package postgresql.jdbc2
Package org.postgresql.jdbc2
------------------------
The classes in this package handle the JDBC 2 Specification, for JDK 1.2
All interfaces in the java.sql, and javax.sql packages are present here.
Package postgresql.largeobject
Package org.postgresql.largeobject
------------------------------
LargeObject Represents an open LargeObject
LargeObjectManager Handles the opening and deleting of LargeObjects
Package postgresql.util
Package org.postgresql.util
-----------------------
PGmoney Maps to postgresql type money