connection
Description
Create a connection to a PostgreSQL database using the PostgreSQL native
interface. Configure a PostgreSQL native interface data source using the databaseConnectionOptions
function.
Creation
Create a connection
object by using the postgresql
function.
Properties
DataSource
— Data source name
string scalar
This property is read-only.
Data source name, specified as a string scalar.
Example:
"PostgreSQLDataSource"
Data Types: string
Database
— Database name
""
(default) | string scalar
This property is read-only.
Database name, specified as a string scalar.
If you use the 'DatabaseName'
name-value pair argument of the
postgresql
function, the postgresql
function sets the
Database
property of the connection
object to
the specified value.
Example:
"toystore_doc"
Data Types: string
Server
— Server name
localhost
(default) | string scalar
This property is read-only.
Server name, specified as a string scalar.
If you use the 'Server'
name-value pair argument of the postgresql
function, the postgresql
function sets the
Server
property of the connection
object to the
specified value.
Example:
"dbtb00"
Data Types: string
PortNumber
— Port number
5432
(default) | numeric scalar
This property is read-only.
Port number, specified as a numeric scalar.
If you use the 'PortNumber'
name-value pair argument of the
postgresql
function, the postgresql
function sets the
PortNumber
property of the connection
object to
the specified value.
Example:
5432
Data Types: double
UserName
— User name
""
(default) | string scalar
This property is read-only.
User name, specified as a string scalar.
Data Types: string
DefaultCatalog
— Default catalog
""
(default) | string scalar
This property is read-only.
Default catalog, specified as a string scalar.
Example:
"toy_store"
Data Types: string
Catalogs
— Catalogs in database
""
(default) | string array
This property is read-only.
Catalogs in the database, specified as a string array.
Example:
["information", "postgresql"]
Data Types: string
Schemas
— Schemas in database
""
(default) | string array
This property is read-only.
Schemas in the database, specified as a string array.
Example: ["information_schema", "toys"]
Data Types: string
AutoCommit
— Flag to autocommit transactions
string scalar
Flag to autocommit transactions, specified as one of these values:
"on"
— Database transactions are automatically committed to the database."off"
— Database transactions must be committed to the database manually.
You can set this property by using dot notation.
LoginTimeout
— Login timeout
0
(default) | positive numeric scalar
This property is read-only.
Login timeout, specified as a positive numeric scalar. The login timeout specifies the number of seconds that the driver waits while trying to connect to a database before throwing an error.
When no login timeout for the connection attempt is specified, the value is
0
.
When a login timeout is not supported by the database, the value is
-1
.
Data Types: double
MaxDatabaseConnections
— Maximum number of database connections
-1
(default) | positive numeric scalar
This property is read-only.
Maximum number of database connections, specified as a positive numeric scalar.
When the database has no upper limit to the maximum number of database connections,
the value is 0
.
When a maximum number of database connections is not supported by the database, the
value is -1
.
Data Types: double
DatabaseProductName
— Database product name
""
(default) | string scalar
This property is read-only.
Database product name, specified as a string scalar.
When the database connection is invalid, the value is an empty string scalar
""
.
Example: "PostgreSQL"
Data Types: string
DatabaseProductVersion
— Database product version
""
(default) | string scalar
This property is read-only.
Database product version, specified as a string scalar.
When the database connection is invalid, the value is an empty string scalar
""
.
Example:
"9.4.5"
Data Types: string
DriverName
— Driver name
""
(default) | string scalar
This property is read-only.
Driver name of the PostgreSQL driver, specified as a string scalar.
When the database connection is invalid, the value is an empty string scalar
""
.
Example:
"libpq"
Data Types: string
DriverVersion
— Driver version
""
(default) | string scalar
This property is read-only.
Driver version of the PostgreSQL driver, specified as a string scalar.
When the database connection is invalid, the value is an empty string scalar
""
.
Example:
"10.12"
Data Types: string
Object Functions
Manage PostgreSQL Database Connection
Import Data from PostgreSQL Database
fetch | Import results of SQL statement in PostgreSQL database into MATLAB |
sqlinnerjoin | Inner join between two PostgreSQL database tables |
sqlouterjoin | Outer join between two PostgreSQL database tables |
sqlfind | Find information about all table types in PostgreSQL database |
sqlread | Import data into MATLAB from PostgreSQL database table |
executeSQLScript | Execute SQL script on PostgreSQL database |
Export Data to PostgreSQL Database
sqlwrite | Insert MATLAB data into PostgreSQL database table |
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 configurationCatalog and Schema Information
— Names of catalogs and schemas in the databaseDatabase 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)
Version History
Introduced in R2020b
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