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73 lines
2 KiB
Markdown
73 lines
2 KiB
Markdown
# php-libinnodb-fk
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This library retrievies and optionally resolves foreign keys in a MySQL/MariaDB database using the InnoDB storage engine.
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**This library will only work with databases created with InnoDB**
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## Install with composer
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```
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composer require victorwesterlund/libinnodb-fk
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```
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```php
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use victorwesterlund\ForeignKeys\ForeignKeys
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```
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# Example / Documentation
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Start by initializing `ForeignKeys` with `mysqli` connection details. `ForeignKeys` will pass the arguments along to `mysqli::__construct()`.
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Remember to pass the database name where InnoDB foreign keys are stored to the 4th argument. The user must also have `SELECT` permissions on this database as the (4th) `$database` argument. It's usually `information_schema`. You can also pass the `ForeignKeys::DATABASE_NAME` constant if you're unsure.
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**Example database relationship:**
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## Initialize `ForeignKeys`
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```php
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use victorwesterlund\ForeignKeys\ForeignKeys
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$fk = new ForeignKeys($host, $user, $pass, ForeignKeys::DATABASE_NAME);
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```
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## Get column constraints for a table
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Pass a database and table to `for()` and then chain `get_constraints()` to receive an associative array of all column relationships for that table.
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```php
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$fk->for("test", "bar")->get_constraints();
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```
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```php
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[
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// Name of the column that has a foreign key reference
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"fk" => [
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// key is the database and table it references. Value is the column
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"test.foo" => "id"
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]
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]
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```
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## Resolve foreign key references for entities
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You can also resolve foreign key references for a passed array of arrays.
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Retrieve rows from your database and pass them to `resolve_all()` as an array of associatve arrays to resolve them automatically.
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```php
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$rows = [
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"id" => 1,
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"fk" => 2
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];
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$rows = $fk->for("test", "bar")->resolve_all($rows);
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```
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```php
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// $rows will become
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[
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"id" => 1,
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"fk" => [
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"id" => 2,
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"value" => "hello world"
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]
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]
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```
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