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the mysql connector has functions for the new, next, previous record.
Can you update this tool with a function to load a specific record from database?
e.g. if (action=='load'){
// index == the record number
}
posted from an other form eg searching form ?

You can use the 'filter' property to display specific records.
Please see the documentation for more details.

there are : function mySqlPrevious()
{
mySqlAction('prev');
}
function mySqlNext()
and so on

where is Filter or how can I call filter by code ?

You can set the filter in the properties of the extension.
The option is documented in the PDF.

Note that there is no support on (free) extensions. The extensions is provided "AS IS"\.