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I have upgraded my Magento version from 2.2.7 to 2.3.2. I am working on a module where I have to create a table and insert some sample data.

As per the new conventions introduced in Magento 2.3.x, I created the table using app/code/[Packagename]/[Modulename]/etc/db_schema.xml. The table has been created successfully.

Now, I am trying to add data to the table using the patch file app/code/[Packagename]/[Modulename]/Setup/Patch/Data/InsertTemplates.php

The apply() function code is as follows:

public function apply()
{
    $data = array();
    $data[0]['template_name'] = __('Default Template 1');
    $data[0]['style_color'] = '#DC8C71';
    $data[0]['text_color'] = '#949392';
    $data[0]['caption'] = __('Gift Card');

    $data[1]['template_name'] = __('Default Template 2');
    $data[1]['style_color'] = '#DC8C71';
    $data[1]['text_color'] = '#636363';
    $data[1]['caption'] = __('Gift Card');
}

When I run the following commands:

php bin/magento setup:db-declaration:generate-whitelist --module-name=[Packagename]_[Modulename]

php bin/magento s:up

Both commands are running successfully, but the data is not being inserted into the table.

Can anyone help me understand, what can be the problem.

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First of all, check whether you are using the correct Packagename and Modulename when running the command:

php bin/magento setup:db-declaration:generate-whitelist --module-name=[Packagename]_[Modulename]

Next, Magento uses the table patch_list to keep the patch version's history to prevent a re-run of the patch code.

Please check whether there is already an entry of your patch in the patch_list table.

I hope it give some clue.

Bonus: The command

php bin/magento setup:db-declaration:generate-whitelist --module-name=[Packagename]_[Modulename]

is not required when you install new data using a patch.

This command is only required when there is any database schema changed.

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