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==Java==
==PostgreSQL Specifications==
* PostgreSQL 8Installation (v 9.9.1 for J2EE/JDBC applications -1): [http://wikiwww.postgresql.org/images/a/acdownload/Pg_8.1_J2EE_v1.0.pdf]* Installation: -> for [http://www.postgresqlenterprisedb.orgcom/downloadproducts/pgdownload.do#windows windows]
* Tutorial @ [http://www.postgresql.org/docs/9.0/static/index.html PostgreSQl Documentation]
* Guide to report problems [http://wiki.postgresql.org/wiki/Guide_to_reporting_problems]
* PostgreSQL 8.1 for J2EE/JDBC applications [http://wiki.postgresql.org/images/a/ac/Pg_8.1_J2EE_v1.0.pdf]
* [http://www.postgresql.org/files/documentation/books/aw_pgsql/node200.html Reference Manual]
===Connection to the driver===
* JDBC Interface
: 1- XA JDBC driver for Postgre (needed for NexJ Express Model)
:: XA Data Source, as for what they mean: XA are for distributed transactions (as per the Open Group specificitions) and non-XA are not (transactions must be single-database). [http://www.theserverside.com/discussions/thread.tss?thread_id=21385]
:: Hierarchy for package [http://jdbc.postgresql.org/development/privateapi/org/postgresql/xa/package-tree.html org.postgresql.xa] - src of the hirearchy [http://grepcode.com/file/repository.jboss.com/maven2/postgresql/postgresql/8.3-603.jdbc3/org/postgresql/core/ConnectionFactory.java?av=f]
:: [http://jdbc.postgresql.org/todo.html Bugs]
:: Postgresql Limited XA Support[http://www.atomikos.com/Documentation/KnownProblems#Postgresql_Limited_XA_Support] - PostgreSQL XA support is limited in what it can do; using Postgresql is not recommended and not supported. If you do choose to use it, see this forum post for some of the problems.
: [http://www.postgresql.org/docs/8.4/static/app-psql.html psql]
: [http://www.postgresql.org/docs/9.0/interactive/app-pg-ctl.html working with server]
: psql [http://www.postgresonline.com/special_feature.php?sf_name=postgresql83_psql_cheatsheet&outputformat=html cheatsheet]
* GUI
: PGAdimn [http://www.pgadmin.org/visualtour.php Visual tour]
===Mapping Data Types, Metadata===
* Mapping Overview
: Because data types in SQL and data types in the Java programming language are not identical, there needs to be some mechanism for transferring data between an application using Java types and a database using SQL types. [http://download.oracle.com/javase/1.3/docs/guide/jdbc/getstart/mapping.html]
: Mapping - Postgre [http://postgresql.1045698.n5.nabble.com/PostgreSQL-data-types-mapped-Java-classes-for-JDBC-td3205204.html]
* Data Types
: Bytea - Binary - hex::A binary string is a sequence of bytes. Unlike character strings, which usually contain text data, binary strings are used to hold non-traditional data such as pictures, voice, or mixed media. [http://publib.boulder.ibm.com/infocenter/db2luw/v8/index.jsp?topic=/com.ibm.db2.udb.doc/admin/r0008472.htm] & [http://www.enterprisedb.com/docs/en/8.3R2/jdbc/Postgres_Plus_Advanced_Server_JDBC_Connector_Guide-24.htm]
:: PostgreSQL can not store values of more than several thousands bytes within any data-type except large objects, nor can binary data be easily entered within single quotes. Instead, large objects (BLOB) are used to store very large values and binary data. From PostgreSQL documentation “String Functions and Operators”[6] we catch the function ENCODE(data bytea, type text). This function encodes binary data to an ASCII-only representation. The supported types are: base64, hex, escape.[http://lab.lonerunners.net/blog/binary-data-fetching-through-sqli]
:: [http://www.enterprisedb.com/docs/en/8.3R2/jdbc/Postgres_Plus_Advanced_Server_JDBC_Connector_Guide-24.htm Using BYTEA Data with Java]:: Binary operations and functions: ENCODE & DECODE [http://www.postgresql.org/docs/current/static/functions-string.html]
:: Example [http://stackoverflow.com/questions/3103242/inserting-text-string-with-hex-into-postgresql-as-a-bytea]
<source lang = java>
INSERT INTO mytable (testcol)
VALUES (decodeDECODE('013d7d16d7ad4fefb61bd95b765c8ceb', 'hex'))
SELECT ENCODE(testcol, 'hex') FROM mytable; // prints: 013d7d16d7ad4fefb61bd95b765c8ceb
: bit & bit varying - for storing binaries [http://www.postgresql.org/docs/8.1/static/datatype-bit.html]
: BLOBs [http://www.postgresql.org/files/documentation/books/aw_pgsql/node96.html]
===Functions===
: Compare Data types [http://www.linuxnetworks.de/doc/index.php/OpenDBX/DBMS_Datatypes]
: Compare MySQL, Oracle, PostgreSQL [http://www-css.fnal.gov/dsg/external/freeware/mysql-vs-pgsql.html
: Converting MySQL to PostgreSQL -> data types & Functions & Command-line [http://en.wikibooks.org/wiki/Converting_MySQL_to_PostgreSQL]
