close

Close MySQL native interface database connection

Since R2020b

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Syntax

close(conn)

Description

close(conn) closes and invalidates the MySQL® native interface database connection to free up database and driver resources.

example

Examples

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Open Live Script

Create a MySQL® native interface connection to a MySQL 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 MySQL database using the MariaDB® C Connector driver.

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

datasource = "MySQLNative";
username = "root";
password = "matlab";

conn = mysql(datasource,username,password)
conn = 
  connection with properties:

                  DataSource: "MySQLNative"
                    UserName: "root"

  Database Properties:

                  AutoCommit: "on"
                LoginTimeout: 0
      MaxDatabaseConnections: 0

  Catalog and Schema Information:

              DefaultCatalog: "toy_store"
                    Catalogs: ["information_schema", "mysql", "performance_schema" ... and 3 more]
                     Schemas: []

  Database and Driver Information:

         DatabaseProductName: "MySQL"
      DatabaseProductVersion: "8.0.3-rc-log"
                  DriverName: "Mariadb Connector/C"
               DriverVersion: "3.2.5"

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)
    productNumber    Quantity    Price       inventoryDate    
    _____________    ________    _____    ____________________

          1            1700       15      23-Sep-2014 13:38:34
          2            1200        9      09-Jul-2014 02:50:45
          3             356       17      14-May-2014 11:14:28

Determine the highest product quantity from the table.

max(data.Quantity)
ans = 9000

Close the database connection conn.

close(conn)

Input Arguments

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MySQL native interface database connection, specified as a connection object. Starting in R2024a, it is recommended that you use setSecret and getSecret to store and retrieve your credentials for databases that require authentication. For more details, refer to this example.

Version History

Introduced in R2020b

See Also

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