SQLFetch (Function)

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SQLFetch (Function)

In french: SQLAvance

Goes to the next row (i.e next record) of the query result.

When SQLFetch is called for the first time, the current record will be the first record selected by the query.

This function is used to browse the query result "line by line". For more details on the different modes to loop through a query result, see Types of SQL browse.

To optimize performance, we recommend that you use a SQLFirst/SQLNext browse.

The SQL functions are used to handle the MySQL databases and the databases accessible by ODBC (HFSQL for example).

The SQL functions are used to handle the local databases (such as Web SQL databases). Only the SQLFetch/SQLGetCol browse mode is available. For more details, see Accessing a database in local mode (SQLite).

Example

i is int = 0
SQLExec("SELECT LASTNAME, FIRSTNAME, EXTENSION, PHOTO FROM CUSTOMER", "QRY1")
// Retrieve the query row by row
WHILE SQLFetch("QRY1") = 0
// There is still another row to read
i++
// Retrieve the data
LASTNAME[i] = SQLGetCol("QRY1", 1)
FIRSTNAME[i] = SQLGetCol("QRY1", 2)
EXTENSION[i] = SQLGetCol("QRY1", 3)
{"IMAGE"+i} = SQLGetMemo("QRY1", 4)
END
SQLClose("QRY1")

Syntax

<Result> = SQLFetch(<Query name>)

<Result>: Integer

0 if the record was successfully read. The data can be retrieved by SQLGetMemo and SQLGetCol.

<Query name>: Character string

Name of the query created and run by SQLExec,
Name of the query run by SQLExecWDR.
The queries created with the query editor must be specified in the format of a character string.
Only the queries created and run by SQLExec are available.

Remarks

SQLFetch: Partial retrieval of the query result

SQLFetch does not retrieve all the rows of the query result: SQLFetch only returns the current record.

Therefore, the total number of result rows (SQL.NbLine) cannot be retrieved by SQLInfo if SQLFetch is used to browse the result.

Life cycle of a browse

The time it takes SQLFetch to retrieve data from the result is limited to the execution time of the PHP script. SQLFetch cannot continue to retrieve data after the page is returned (even in Session mode).

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