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Easy access to access DES DB. Command line interpreter client for DESDM

Project description

# easyaccess <a href=""> <img src="" alt="latest release" /></a> <a href=""><img src="" alt="License" /> </a> <a href=""><img src="" alt="pypi version"/></a>

Refactored version of trivialAccess for accessing the DES DB

Python Command Line Interpreter to access Oracle DES DB
using cx_Oracle

For a short tutorial (To be completed) check [here](
(Using des credentials)

**Current version = 1.2.0**

## Requirements

- Oracle Client > 11g.2 (External library, no python)
Check [here]( for instructions on how to install these libraries
- [cx_Oracle](
- [fitsio]( >= 0.9.6
- [pandas]( >= 0.14
- [termcolor](
- [PyTables]( (optional, for hdf5 output)
- [future]( (for python 2/3 compatibility)
- **Note that you need to install python-future for python2/3 compatibility**

## Some *nice* features
- Nice output format
- Very flexible configuration
- Smart tab completion for commands, table names, column names and file paths accordingly
- write output results to csv, tab, fits files or HDF5 files
- load tables from csv or fits directly into DB
- intrinsic db commands to describe tables, own schema, quota and more
- It can be imported as module
- Can run command directly from command line
- Load sql query from file and/or from editor
- Show the execution plan of a query if required
- Many more

## Basic use

### Running SQL commands
Once inside the interpreter run SQL queries by adding a ; at the end::

DESDB ~> select ... from ... where ... ;

To save the results into a table add ">" after the end of the query (after ";") and namefile at the end of line

DESDB ~> select ... from ... where ... ; > test.fits

The files supported so far are (.csv, .tab, .fits, .h5) any other extension is ignored

### Load tables
To load a table it needs to be in a csv format with columns names in the first row
the name of the table is taken from filename

DESDB ~> load_table <filename>

### Load SQL queries
To load sql queries just run:

DESDB ~> loadsql <filename.sql>

DESDB ~> @filename.sql

The format is the same as in command line, SQL statement must end with ;
and to write output files it must be followed by > <output file>

### Configuration

The configuration file is located at $HOME/.easyaccess/config.ini

but everything can be configured from inside easyaccess


DESDB ~> help config

to see the meanings of all the options, and:

DESDB ~> config all show

to see the current values, to modify one value, e.g., the prefetch value

DESDB ~> config prefetch set 50000

and to see any particular option (e.g., timeout):

DESDB ~> config timeout show

### TODO
- There is a bug with some versions of readline
- Other small changes when loading tables
- Self-upgrade

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