postgresql

Create PostgreSQL native interface database connection

Syntax

conn = postgresql(datasource,username,password)

conn = postgresql(username,password,Name,Value)

Description

conn = postgresql(datasource,username,password) creates a PostgreSQL native interface database connection using the specified data source, user name, and password. conn is a connection object.

conn = postgresql(username,password,Name,Value) creates a PostgreSQL native interface database connection using the specified user name and password, with additional options specified by one or more name-value pair arguments. For example, "Server","dbtb00" specifies the database server name as dbtb00.

Examples

Connect to PostgreSQL Database Using PostgreSQL Native Interface

Create a PostgreSQL native interface connection to a PostgreSQL database. Then, import data from the database into MATLAB® and perform simple data analysis. Close the database connection.

This example assumes that you are connecting to a PostgreSQL database version 9.405 using the libpq driver version 10.12.

Connect to the database using the data source name, user name, and password.

datasource = "PostgreSQLDataSource";
username = "dbdev";
password = "matlab";

conn = postgresql(datasource,username,password)

conn = 
  connection with properties:

                  DataSource: "PostgreSQLDataSource"
                    UserName: "dbdev"

  Database Properties:

                  AutoCommit: "on"
                LoginTimeout: 0
      MaxDatabaseConnections: 100

  Catalog and Schema Information:

              DefaultCatalog: "toystore_doc"
                    Catalogs: "toystore_doc"
                     Schemas: ["pg_toast", "pg_temp_1", "pg_toast_temp_1" ... and 3 more]

  Database and Driver Information:

         DatabaseProductName: "PostgreSQL"
      DatabaseProductVersion: "9.405"
                  DriverName: "libpq"
               DriverVersion: "10.12"

The property sections of the connection object are:

• Database Properties — Information about the database configuration

• Catalog and Schema Information — Names of catalogs and schemas in the database

• Database and Driver Information — Names and versions of the database and driver

Import all data from the table inventoryTable into MATLAB using the sqlread function. Display the first three rows of data.

tablename = "inventoryTable";
data = sqlread(conn,tablename);
head(data,3)

ans=3×4 table
    productnumber    quantity    price        inventorydate    
    _____________    ________    _____    _____________________

          1            1700      14.5     "2014-09-23 09:38:34"
          2            1200         9     "2014-07-08 22:50:45"
          3             356        17     "2014-05-14 07:14:28"

Determine the highest product quantity from the table.

max(data.quantity)

ans = 9000

Close the database connection conn.

close(conn)

Connect to PostgreSQL Database Using PostgreSQL Native Interface and Additional Options

Create a PostgreSQL native interface connection to a PostgreSQL database using name-value pair arguments. Then, import data from the database into MATLAB® and perform simple data analysis. Close the database connection.

This example assumes that you are connecting to a PostgreSQL database version 9.405 using the libpq driver version 10.12.

Connect to the database using the user name and password shown. Specify the database server name dbtb00, database name toystore_doc, and port number 5432 by setting the corresponding name-value pair arguments.

username = "dbdev";
password = "matlab";

conn = postgresql(username,password,'Server',"dbtb00", ...
    'DatabaseName',"toystore_doc",'PortNumber',5432)

conn = 
  connection with properties:

                    Database: "toystore_doc"
                    UserName: "dbdev"

  Database Properties:

                  AutoCommit: "on"
                LoginTimeout: 0
      MaxDatabaseConnections: 100

  Catalog and Schema Information:

              DefaultCatalog: "toystore_doc"
                    Catalogs: "toystore_doc"
                     Schemas: ["pg_toast", "pg_temp_1", "pg_toast_temp_1" ... and 3 more]

  Database and Driver Information:

         DatabaseProductName: "PostgreSQL"
      DatabaseProductVersion: "9.405"
                  DriverName: "libpq"
               DriverVersion: "10.12"

The property sections of the connection object are:

• Database Properties — Information about the database configuration

• Catalog and Schema Information — Names of catalogs and schemas in the database

• Database and Driver Information — Names and versions of the database and driver

Import all data from the table inventoryTable into MATLAB using the sqlread function. Display the first three rows of data.

tablename = "inventoryTable";
data = sqlread(conn,tablename);
head(data,3)

ans=3×4 table
    productnumber    quantity    price        inventorydate    
    _____________    ________    _____    _____________________

          1            1700      14.5     "2014-09-23 09:38:34"
          2            1200         9     "2014-07-08 22:50:45"
          3             356        17     "2014-05-14 07:14:28"

Determine the highest product quantity from the table.

max(data.quantity)

ans = 9000

Close the database connection conn.

close(conn)

Input Arguments

datasource — Data source name

character vector | string scalar

Data source name, specified as a character vector or string scalar. Specify the name of an existing data source.

Example: "myDataSource"

Data Types: char | string

username — User name

character vector | string scalar

User name required to access the database, specified as a character vector or string scalar. If no user name is required, specify an empty value "".

Data Types: char | string

password — Password

character vector | string scalar

Password required to access the database, specified as a character vector or string scalar. If no password is required, specify an empty value "".

Data Types: char | string

Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

Example: conn = postgresql(username,password,"Server","dbtb00","PortNumber",5432,"DatabaseName","toystore_doc") creates a PostgreSQL native interface database connection using the database server dbtb00, port number 5432, and database name toystore_doc.

'Server' — Database server name

"localhost" (default) | string scalar | character vector

Database server name or address, specified as the comma-separated pair consisting of 'Server' and a string scalar or character vector.

Example: "dbtb00"

Data Types: char | string

'PortNumber' — Port number

5432 (default) | numeric scalar

Port number, specified as the comma-separated pair consisting of 'PortNumber' and a numeric scalar.

Example: 5432

Data Types: double

'DatabaseName' — Database name

"" (default) | string scalar | character vector

Database name, specified as the comma-separated pair consisting of 'DatabaseName' and a string scalar or character vector. If you do not specify a database name, the postgresql function connects to the default database on the database server.

Example: "toystore_doc"

Data Types: char | string