4D Database Dump to MySQL

This PHP script connects to a 4D database then dumps all or some table structure and data into compliant MySQL SQL statements. Due to limitations of the 4D SQL implementation, some columns are inaccessible and therefore the data is skipped.

Requires PDO_4D PHP extension: http://www.php.net/manual/en/ref.pdo-4d.php

Note: This was created and tested with 4D V11.4 and Ubuntu 12.04LTS YMMV. A 3.7GB SQL file was sucessful exported from 4D and imported to MySQL.

Usage

4d-mysqldump.php [OPTIONS]
  -H, --help          Display this help and exit.
  -h, --host=name     4D server hostname or IP (required.)
  -u, --user=name     4D username (required.)
  -p, --password=password
                      4D password (required.)
  -r, --retries=count Number of connection attempt retries (default 3, for a
                      total of 4.)
  -l, --list          List all tables and exit.
  -t, --table=name    Dumps a specific table instead of all tables.
  -b, --ignore-binary Ignore picture/blob columns. They contain binary data
                      which may significantly increase the export size, but may
                      not be needed.
  -s, --skip-structure
                      Only print data, don't print table structure.
  -o, --offset=count  The offset to use during the export.
  -c, --limit=count   The limit to use during the export.
  -w, --allow-spaces  Don't removed spaces from column names.

Known Issues

READ THIS!

The 4D library used by the PDO_4D PHP extension has a severe memory leak. The workaround used in this is a new thread for every table and whenever the memory use hits a predetermined limit. The long term solution is fixing the 4D library or rewriting to not use it.
Columns of type Subtable Relation when manually created cannot return useful information via SQL and are therefore dropped/ignored. The automatically created Subtable Relation fields are exported correctly.

Install

Install PHP
Compile/enable the PDO_4D extension (see directions below)
Clone this script
Test the connection using -t to list available tables.
Dump your database and import to MySQL!

Compile/enable PDO_4D

Tested on Ubuntu 12.04/14.04 with PHP 5.3.10/5.4.6/5.5.9

# Install dependencies (You may need more)
sudo apt-get install php5-dev
# Clone a working version of the code from the FAMSF repo
git clone https://github.com/famsf/pecl-pdo-4d.git pdo_4d
cd pdo_4d
# Prepare the PHP extension for compiling
phpize
# Workaround acinclude.m4 pointing to incorrect header location.
# See: https://bugs.launchpad.net/ubuntu/+source/php5/+bug/1393640
sudo ln -s /usr/include/php5/ /usr/include/php
# Configure the package to the system
./configure --with-pdo-4d
# Compile!
make
# Copy the extension to PHP's library
sudo make install
# Create php5 module configuration file for PHP 5.4/5.5
sudo sh -c "echo extension=pdo_4d.so > /etc/php5/mods-available/pdo_4d.ini"
# Enable the module for PHP 5.4/5.5
sudo php5enmod pdo_4d
# Enable the module for PHP 5.3
sudo sh -c "echo extension=pdo_4d.so > /etc/php5/conf.d/pdo_4d.ini"
# Restart apache
sudo apache2ctl restart
# Check for PDO_4D in the PHP CLI Information
php -i | grep 4D

Todo

A 'test' option to list all problem tables/columns.
Output the warnings/notices via stderr instead of PHP's trigger_error.
Export 4D foreign key constraints.
Add comments to tables describing missing columns.
Add comments to columns describing foreign keys.
Load h/u/p from ~/.4d.conf.
Error for missing php 4d extension.
Allow queries to be run (maybe.)
Include default values for columns in SQL.
Fix parseopt() to handle multi-value arrays and prioritize argument order.
Add all missing data types.
Thread Manager really should be a different class.
Rewrite the whole thing in C! (Probably not)