Codeigniter 4 – Database Meta Data with Example

Database Metadata

- Database metadata refers to the data that describes the structure and organization of a database.
- In CodeIgniter 4, you can use the db() function to retrieve metadata about your database.

Listing Tables

- Use the list_tables() method to retrieve a list of tables in the database.

Example:

$tables = db()->list_tables();

Listing Columns

- Use the list_columns() method to retrieve a list of columns in a table.

Example:

$columns = db()->list_columns('my_table');

Field Data

- Use the field_data() method to retrieve metadata about a field.

Example:

$field_data = db()->field_data('my_table', 'name');

Primary Keys

- Use the primary_keys() method to retrieve the primary keys of a table.

Example:

$primary_keys = db()->primary_keys('my_table');

Foreign Keys

- Use the foreign_keys() method to retrieve the foreign keys of a table.

Example:

$foreign_keys = db()->foreign_keys('my_table');

Indexes

- Use the indexes() method to retrieve the indexes of a table.

Example:

$indexes = db()->indexes('my_table');

I hope this helps! Let me know if you have any further questions or need more information.

Note: Database metadata is useful for building dynamic applications, debugging, and optimizing database performance. CodeIgniter 4 provides a simple and intuitive way to retrieve metadata about your database.