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45b5d792af
- 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
199 lines
7.0 KiB
Plaintext
199 lines
7.0 KiB
Plaintext
This short document is provided to help programmers through the internals of
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the PostgreSQL JDBC driver.
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Last update: January 17 2001 peter@retep.org.uk
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build.xml
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---------
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As of 7.1, we now use the ANT build tool to build the driver. ANT is part of
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the Apache/Jakarta project, and provides far superior build capabilities. You
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can find ANT from http://jakarta.apache.org/ant/index.html and being pure java
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it will run on any java platform.
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So far I've tested it under JDK1.2.x & JDK1.3 (both Linux & NT) but not yet with
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JDK1.1.8. Because of the latter the Makefile still works for now, but should be
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gone for 7.2.
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Anyhow, to build, simply type ant and the .jar file will be created and put into
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the jars directory.
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Tip: If you run ant from the sources root directory (ie: where the configure
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script is located) you will find another build.xml file. It is advised to run
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ant from that directory as it will then compile some auxilary Java/JDBC
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utilities that are located under the /contrib/retep directory.
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Makefile
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--------
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Prior to 7.1, all compilation must be done by using Make. This is because there
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are three versions of the driver, one for JDBC1 (for JDK 1.1.x) and the others
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for JDBC2 (for JDK 1.2 or later, one standard and one enterprise).
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As of 7.1, ANT is the build tool of choice. Just compare Makefile and build.xml
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to see why! Make just isn't suited to Java.
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Building with just the JDK
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--------------------------
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This is not advised, simply because you have to make sure you include the
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correct classes, and the fact that org.postgresql.Driver is built on the fly.
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Also, javac won't pick up all the classes because some (org.postgresql.geometric
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for example) are loaded dynamically.
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org/postgresql/Driver.java.in
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-----------------------------
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Because there are three versions of the driver, the org.postgresql.Driver class
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is built dynamically. To build correctly ANT copies the Driver.java.in file to
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Driver.java replacing certain values according to the required driver.
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The replaced values are of the format %VALUE%, ie: %MAJORVERSION% is replaced
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with 7 in the 7.1 version of the driver.
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postgresql.jar
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--------------
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This jar file is produced by ANT, and contains the driver for your JDK platform.
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If you downloaded a precompiled binary from the web, you may find that the
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jar file will be named differently. These are identical to this file but are
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named according to the backend and jdk versions.
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The naming convention is of the form: jdbc-#.#-#.##.jar
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ie: for 7.1
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jdbc-7.1-1.1.jar JDBC Driver for JDK1.1.8
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jdbc-7.1-1.2.jar JDBC Driver for JDK1.2 & JDK1.3
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jdbc-7.1-1.2ent.jar JDBC Driver for JDK1.2 & JDK1.3 Enterprise Editions
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If in the future there are any 1.3 specific classes then there will be two new
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jar files.
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Note: All the precompiled binaries are built under Linux.
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jdbc.jpx
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--------
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This is a JBuilder4 project file. It's here to allow JBuilder to be used to
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develop the driver. Mainly for it's Editor's features like syntax checking and
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auto-completion etc.
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IMPORTANT: You CAN NOT build the driver from within JBuilder. You must use ANT.
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This is because of the three versions of the JDK. If you try to use
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JBuilder, it will try to build everything, and it will just not work.
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Importing packages
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------------------
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In user code, you may have to import one or more packages, if and only if you
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are using the non jdbc extensions (like FastPath, or LargeObject).
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DO NOT import the postgresql, postgresql.jdbc1 or postgresql.jdbc2 packages!
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Internally, some classes will import the packages when there is a link between
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them and the other packages. However, the above rule still applies. It's there
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because Javac becomes confused between the different places that similar class
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names are present.
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However, there are places where they need to refer to classes in the postgresql
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package. In this case, import the individual classes, and not the entire
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package.
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ie: import postgresql.Field
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NOT import postgresql.*
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Package Layout
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--------------
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The driver is split into several packages:
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org.postgresql core classes that can be accessed by user code
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org.postgresql.core core classes not normally used externally
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org.postgresql.jdbc1 classes used only in implementing JDBC 1
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org.postgresql.jdbc2 classes used only in implementing JDBC 2
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org.postgresql.fastpath FastPath to backend functions
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org.postgresql.geometric 2D Geometric types mapped to Java Objects
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org.postgresql.largeobject Low level Large Object access
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org.postgresql.util Utility classes
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Package org.postgresql
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------------------
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This package holds the core classes.
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Driver registers the driver when it's loaded, and determines which
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Connection class (in jdbc1 or jdbc2 packages) to use when
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connecting to a database.
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Field Used internally to represent a Field
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PG_Stream Used internally to manage the network stream.
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PostgresqlDataSource
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Exists in the Java2 Enterprise edition driver only and is the
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enterprise equivalent to Driver
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These classes contains common code that is not dependent to the
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two JDBC specifications.
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Connection Common code used in Connections, mainly Network Protocol stuff.
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ResultSet Common code used in ResultSet's
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Package org.postgresql.core
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-----------------------
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New in 7.1, this is where core classes (common to all versions) will exist. Any
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new class that would have gone into org.postgresql must go in here instead.
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BytePoolDim1 Handles a pool of byte[] arrays.
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BytePoolDim2 Handles a pool of byte[][] arrays
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MemoryPool Interface for managing MemoryPools. Not used (yet).
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ObjectPool Interface for an Object Pool
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SimpleObjectPool Class that implements ObjectPool and used by BytePoolDim#
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Package org.postgresql.fastpath
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---------------------------
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Fastpath Handles executing a function on the PostgreSQL Backend
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FastpathArg Defines an argument for a function call
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Package org.postgresql.geometric
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----------------------------
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PGbox Maps to postgresql type box
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PGcircle Maps to postgresql type circle
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PGline Maps to postgresql type line
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PGlseg Maps to postgresql type lseg
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PGpath Maps to postgresql type path
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PGpoint Maps to postgresql type point
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PGpolygon Maps to postgresql type polygon
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Package org.postgresql.jdbc1
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------------------------
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The classes in this package handle the JDBC 1 Specification, for JDK 1.1.x
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All interfaces in the java.sql package are present here.
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Package org.postgresql.jdbc2
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------------------------
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The classes in this package handle the JDBC 2 Specification, for JDK 1.2
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All interfaces in the java.sql, and javax.sql packages are present here.
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Package org.postgresql.largeobject
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------------------------------
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LargeObject Represents an open LargeObject
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LargeObjectManager Handles the opening and deleting of LargeObjects
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Package org.postgresql.util
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-----------------------
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PGmoney Maps to postgresql type money
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PGobject Used to represent postgresql types that have no Java equivalent
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PGtokenizer Helper class for the geometric types
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Serialize Used to serialise Java objects into tabes, rather than Blobs
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UnixCrypt Used to handle crypt authentication
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