MATLAB DATABASE TOOLBOX RELEASE NOTES Guia do Utilizador descarregar pdf (Página 388)

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6 Using Database Toolbox Functions

6-46

Run a Custom Database Function

This example shows how to run a custom database function on Microsoft SQL Server.

Consider a database function get_prodCount that retrieves row counts in the table

productTable. The table productTable contains 30 rows where each row represents a

product. This code defines this database function and assumes a schema name dbo.

CREATE FUNCTION dbo.get_prodCount()

RETURNS int

BEGIN

DECLARE @PROD_COUNT int

SELECT @PROD_COUNT = count(*) from productTable

RETURN(@PROD_COUNT)

END

Create the Database Connection

Connect to Microsoft SQL Server. For example, this code assumes you are connecting to a

data source named MS SQL Server with user name username and password pwd.

conn = database.ODBCConnection('MS SQL Server','username','pwd');

Execute the Custom Function

Construct an SQL query string sqlquery that executes the custom function code.

Execute the custom function by running exec.

sqlquery = 'SELECT dbo.get_prodCount() as num_products';

curs = exec(conn,sqlquery);

curs = fetch(curs);

Display the result.

curs = fetch(curs);

curs.Data

ans =

[30.00]

The custom function get_prodCount returns the product count 30.

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