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This module implements an OO-interface to database schemas. Using this module, you can create a database schema with an OO Perl interface. You can read the schema from an existing database. You can save the schema to disk and restore it in a different process. Most importantly, DBIx::DBSchema can write SQL CREATE statements for different databases from a single source.

The DBIx::MySQLSequence package implements an emulation layer that provides "real" sequences on MySQL. The module works by creating a "sequence table", a single table where each record represents a single sequence, and performing some "magic" MySQL specific SQL to ensure the sequences will work correctly.

The DBIx::SQLEngine class provides an extended interface for the DBI database framework. Each SQLEngine object is a wrapper around a DBI database handle, adding methods that support ad-hoc SQL generation and query execution in a single call. Dynamic subclassing based on database server type enables cross-platform portability.

This module offers a set of DBI-specific exception classes. They inherit from Exception::Class, the base class for all exception objects created by the Exception::Class module from the CPAN. Exception::Class::DBI itself offers a single class method, handler(), that returns a code reference appropriate for passing to the DBI HandleError attribute.

GDBM_File is a perl module which allows Perl programs to make use of the facilities provided by the GNU gdbm library. If you intend to use this module you should really have a copy of the gdbm manualpage at hand. Most of the libgdbm.a functions are available through the GDBM_File interface.

This perl module constructs a graph for a database showing tables and connecting them if they are related. While or after constructing the object, pass an open database handle, then call `graph_tables' to determine database metadata and construct a GraphViz graph from the table and field information.

This module provides the basic constants and other support functions required to communicate with a Cassandra database using CQL3. It is not in itself a CQL client; it simply provides the necessary support functions to allow one to be written. For a complete client, see instead Net::Async::CassandraCQL.

PEAR::DB_DataObject performs 2 tasks: 1. Builds SQL statements based on the objects vars and the builder methods. 2. acts as a datastore for a table row. The core class is designed to be extended for each of your tables so that you put the data logic inside the data classes. included is a Generator to make your configuration files and your base classes.

pgpool is a connection pool server for PostgreSQL. pgpool runs between PostgreSQL's clients(front ends) and servers(back ends). A PostgreSQL client can connect to pgpool as if it were a standard PostgreSQL server. pgpool caches the connection to PostgreSQL server to reduce the overhead to establish the connection to it.

This extension provides an API for communicating with Redis database, a persistent key-value database with built-in net interface written in ANSI-C for Posix systems. It is a fork of alfonsojimenez's phpredis, adding many methods and fixing a lot of issues.