How to Populate Dropdowns with Enum Values from MySQL?

Retrieving Enum Values in MySQL for Dropdown Population

One common challenge in dynamic form generation is populating dropdowns with enum values retrieved from a database. MySQL provides a convenient method to extract these values.

Retrieving Enum Values using SQL

To get the possible enum values from a database table, execute the following query:

<code class="sql">SHOW COLUMNS FROM [table_name] WHERE Field = '[field_name]'</code>

Extracting Enum Values from Query Result

The Type column of the query result will contain the enum values enclosed in single quotes. To extract them, you can use the following code:

<code class="php">$type = $row['Type'];
preg_match('/^enum\(\'(.*)\'\)$/', $type, $matches);
$enum = explode("','", $matches[1]);</code>

Example Function

The following function combines the above steps to retrieve enum values:

<code class="php">function get_enum_values($table, $field)
{
    $type = fetchRowFromDB("SHOW COLUMNS FROM {$table} WHERE Field = '{$field}'")->Type;
    preg_match("/^enum\(\'(.*)\'\)$/", $type, $matches);
    $enum = explode("','", $matches[1]);
    return $enum;
}</code>

This function can be used in conjunction with your form generation logic to automatically populate dropdowns with enum values retrieved from the database.

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