Getting Started JChem PostgreSQL Cartridge

This guide will serve as a basic introduction to installing and using JChem PostgreSQL Cartridge (JPC).

See also Installation and Administration and API Usage pages for detailed description of administration and API use cases.

System requirement

• CentOS, RedHat, Debian or Ubuntu operating system x86_64 version.

Find information for cases of other linux systems

• postgreSQL 12 relational database for JPC versions starting from 5.0

• availability of hstore extension of postgresql (e.g., contrib package)

• Java17 runtime environment (starting from version 23.11). We support AdoptOpenJDK 17 as well. In the case of AdoptOpenJDK libfontconfig package must be included.
  

Installation and Setup

Install PostgreSQL Cartridge

Download the latest version of PostgreSQL Cartridge from here. In order to install the latest version, change ** x.y ** (version information) in the following statement to the current one:

In CentOS or RedHat:

sudo yum localinstall jchem-psql-x.y.x86_64.rpm

In Debian:

sudo dpkg -i jchem-psql-x.y.x86_64.deb

Before the first use

1. Install your license file

   Copy a valid Chemaxon license to /etc/chemaxon/license.cxl. Required license in the license file is 'Postgres Cartridge'. The jchem-psql user should have read access to the license file.

2. Initialize index directory

   sudo service jchem-psql init
   

   {primary}
   If you encounter a problem in your java installation, set your JAVA_HOME in the file /etc/default/jchem-psql.
   

3. First start

   sudo service jchem-psql start
   

Using the extension in a database

1. Create postgres user and database

   sudo su postgres
   createuser testuser
   createdb testdb -O testuser
   

2. Install the extensions

   psql testdb
   testdb> CREATE EXTENSION chemaxon_type;
   testdb> CREATE EXTENSION hstore;
   testdb> CREATE EXTENSION chemaxon_framework;
   

3. Checking JChem-psql cartridge installation

   If jchem-psql service is running, the following query can be executed without any problem:

   testdb> SELECT 'C'::Molecule('sample') |<| 'CC'::Molecule;
   

Service

The service can be started/stopped using

sudo service jchem-psql start
sudo service jchem-psql stop

By default, the service starts on system boot. This can be switched off by setting ENABLED=0 in the /etc/default/jchem-psql file.

BASIC API Usage

CREATE TABLE

CREATE TABLE table_name (structure_column_name MOLECULE('molecule_type_name'));

Example:

CREATE TABLE ttest (mol MOLECULE('sample'));

Import data

• Import from sdf/mol file (located on your local machine):

   et variable_name `cat sdf_file_name`
  CREATE TABLE table_name AS 
      SELECT molSrc::molecule('molecule_type_name') AS (structure_column_name)[, props ->'sdf_field_name' AS column_name] FROM parse_sdf(:'variable_name');
  

  Example:

   et content `cat ~/a.sdf`
  CREATE TABLE mysdftable AS 
      SELECT molSrc::molecule('sample') AS mol,
          props -> 'Molformula' AS formula 
      FROM parse_sdf(:'content');
  

• Import from local smiles/cxsmiles/smarts/cxsmarts files:

  \COPY table_name (structure_column_name) FROM 'file_name' (FORMAT csv);
  

  Example:

  \COPY ttest(mol) FROM '/home/posgresuser/targetfiles/nci-pubchem_1m_unique.smiles' (FORMAT csv);
  

CREATE INDEX

Indextype named sortedchemindex or chemindex has to be used when indexing a column that contains chemical structures.

CREATE INDEX index_name ON table_name USING sortedchemindex(structure_column_name);

Example:

  CREATE INDEX ttest_idx ON ttest USING sortedchemindex(mol);

SELECT

Substructure search

SELECT * FROM table_name WHERE 'query_structure' |<| structure_column_name;

Examples:

    SELECT * FROM ttest WHERE '<?xml version="1.0" encoding="windows-1250"?>
    <cml xmlns="http://www.chemaxon.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.chemaxon.com/marvin/help/formats/schema/mrvSchema_6_1_0.xsd" version="ChemAxon file format v6.1, generated by v6.1.3">
    <MDocument>
    <MChemicalStruct>
    <molecule molID="m1">
    <atomArray atomID="a1" elementType="C" x2="3.4100000858306885" y2="3.740000009536743"/>
    <bondArray/>
    </molecule>
    </MChemicalStruct>
    </MDocument>
    </cml>' |<| mol;

    SELECT * FROM ttest WHERE 'c1ccccc1' |<| mol;

    SELECT * FROM ttest WHERE '[#6]-[#6]' |<| mol;

Full fragment (exact fragment) search

SELECT * FROM table_name WHERE 'query_structure' |<=| structure_column_name;

Example:

SELECT * FROM ttest WHERE 'C[C@H](n)C(O)=O' |<=| mol;

Superstructure search

SELECT * FROM table_name WHERE 'query_structure' |>| structure_column_name;

Example:

SELECT * FROM ttest WHERE 'CCC' |>| mol;

Duplicate search

SELECT * FROM table_name WHERE 'query_structure' |=| structure_column_name;

Example:

SELECT * FROM ttest WHERE 'CCC' |=| mol;