PgAdmin 4 pgAdmin 4 is a rewrite of the popular pgAdmin3 management tool for the PostgreSQL (database. In the following documentation and examples, '$PGADMIN4SRC/' is used to denote the top-level directory of a copy of the pgAdmin source tree, either from a tarball or a git checkout. Architecture - pgAdmin 4 is written as a web application in Python, using jQuery and Bootstrap for the client side processing and UI.
On the server side, Flask is being utilised. Although developed using web technologies, pgAdmin 4 can be deployed either on a web server using a browser, or standalone on a workstation.
The runtime/ subdirectory contains a QT based runtime application intended to allow this - it is essentially a Python application server that runs in the system tray and allows the user to connect to the application using their web browser. Building the Runtime - To build the runtime, the following packages must be installed: - QT 4.6 or above - Python 2.6, 2.7 or 3.4+ Assuming both qmake and python-config are in the path: $ cd $PGADMIN4SRC/runtime $ qmake Project MESSAGE: Building for QT5+. Project MESSAGE: Building for Linux/Mac. Project MESSAGE: Using /usr/bin/python-config Project MESSAGE: Python2 detected.
To build the runtime in debug mode, use the option below with qmake $ qmake CONFIG+=debug To build the runtime in release mode, use the option below with qmake $ qmake CONFIG+=release By default, the runtime application will be built in release mode. On Linux, an executable called 'pgAdmin4' will be built, and on Mac OS X, an app bundle called pgAdmin4.app will be created. To build the runtime on a Windows system, export PYTHONHOME and PYTHONVERSION variables in the System environment. Specify the PYTHONVERSION with the major and minor number. Do not specify micro level version. For example, given a Python version of A.B.C; A - Major number, B - Minor number, C - Micro level (Bug fix releases).
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If Python version is 2.7.12 than specify PYTHONVERSION=27 e.g. PYTHONHOME=C: Python27 PYTHONVERSION=27 You can also use Qt Creator to build, develop and debug the runtime. Simply open the $PGADMIN4SRC/runtime/pgAdmin4.pro project file in Qt Creator and configure the project with a supported version of Qt when prompted. Create Database Migrations - In order to make changes to the SQLite DB, navigate to the 'web' directory: (pgadmin4) $ cd $PGADMIN4SRC/web Create a migration file with the following command: (pgadmin4) $ FLASKAPP=pgAdmin4.py flask db revision This will create a file in: $PGADMIN4SRC/web/migrations/versions/. Add any changes to the 'upgrade' function. Increment the SCHEMAVERSION in $PGADMIN4SRC/web/pgadmin/model/init.py file. There is no need to increment the SETTINGSSCHEMAVERSION.
Configuring the Python Environment - In order to run the Python code, a suitable runtime environment is required. Python versions - Python 2.6, 2.7 or 3.3+ are currently supported. It is recommended that a Python Virtual Environment is setup for this purpose, rather than using the system Python environment.
On Linux and Mac systems, the process is fairly simple - adapt as required for your distribution: 1) Install the virtualenv packages into the system Python environment $ sudo pip install virtualenv virtualenvwrapper 2) Source the virtualenv wrapper tools script.