<?php
namespace Illuminate\Database\Schema\Grammars;
use Doctrine\DBAL\Schema\AbstractSchemaManager as SchemaManager;
use Doctrine\DBAL\Schema\TableDiff;
use Illuminate\Database\Connection;
use Illuminate\Database\Grammar as BaseGrammar;
use Illuminate\Database\Query\Expression;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Fluent;
use LogicException;
use RuntimeException;
abstract class Grammar extends BaseGrammar
{
/**
* If this Grammar supports schema changes wrapped in a transaction.
*
* @var bool
*/
protected $transactions = false;
/**
* The commands to be executed outside of create or alter command.
*
* @var array
*/
protected $fluentCommands = [];
/**
* Compile a create database command.
*
* @param string $name
* @param \Illuminate\Database\Connection $connection
* @return string
*/
public function compileCreateDatabase($name, $connection)
{
throw new LogicException('This database driver does not support creating databases.');
}
/**
* Compile a drop database if exists command.
*
* @param string $name
* @return string
*/
public function compileDropDatabaseIfExists($name)
{
throw new LogicException('This database driver does not support dropping databases.');
}
/**
* Compile a rename column command.
*
* @param \Illuminate\Database\Schema\Blueprint $blueprint
* @param \Illuminate\Support\Fluent $command
* @param \Illuminate\Database\Connection $connection
* @return array
*/
public function compileRenameColumn(Blueprint $blueprint, Fluent $command, Connection $connection)
{
return RenameColumn::compile($this, $blueprint, $command, $connection);
}
/**
* Compile a change column command into a series of SQL statements.
*
* @param \Illuminate\Database\Schema\Blueprint $blueprint
* @param \Illuminate\Support\Fluent $command
* @param \Illuminate\Database\Connection $connection
* @return array
*
* @throws \RuntimeException
*/
public function compileChange(Blueprint $blueprint, Fluent $command, Connection $connection)
{
return ChangeColumn::compile($this, $blueprint, $command, $connection);
}
/**
* Compile a foreign key command.
*
* @param \Illuminate\Database\Schema\Blueprint $blueprint
* @param \Illuminate\Support\Fluent $command
* @return string
*/
public function compileForeign(Blueprint $blueprint, Fluent $command)
{
// We need to prepare several of the elements of the foreign key definition
// before we can create the SQL, such as wrapping the tables and convert
// an array of columns to comma-delimited strings for the SQL queries.
$sql = sprintf('alter table %s add constraint %s ',
$this->wrapTable($blueprint),
$this->wrap($command->index)
);
// Once we have the initial portion of the SQL statement we will add on the
// key name, table name, and referenced columns. These will complete the
// main portion of the SQL statement and this SQL will almost be done.
$sql .= sprintf('foreign key (%s) references %s (%s)',
$this->columnize($command->columns),
$this->wrapTable($command->on),
$this->columnize((array) $command->references)
);
// Once we have the basic foreign key creation statement constructed we can
// build out the syntax for what should happen on an update or delete of
// the affected columns, which will get something like "cascade", etc.
if (! is_null($command->onDelete)) {
$sql .= " on delete {$command->onDelete}";
}
if (! is_null($command->onUpdate)) {
$sql .= " on update {$command->onUpdate}";
}
return $sql;
}
/**
* Compile the blueprint's column definitions.
*
* @param \Illuminate\Database\Schema\Blueprint $blueprint
* @return array
*/
protected function getColumns(Blueprint $blueprint)
{
$columns = [];
foreach ($blueprint->getAddedColumns() as $column) {
// Each of the column types have their own compiler functions which are tasked
// with turning the column definition into its SQL format for this platform
// used by the connection. The column's modifiers are compiled and added.
$sql = $this->wrap($column).' '.$this->getType($column);
$columns[] = $this->addModifiers($sql, $blueprint, $column);
}
return $columns;
}
/**
* Get the SQL for the column data type.
*
* @param \Illuminate\Support\Fluent $column
* @return string
*/
protected function getType(Fluent $column)
{
return $this->{'type'.ucfirst($column->type)}($column);
}
/**
* Create the column definition for a generated, computed column type.
*
* @param \Illuminate\Support\Fluent $column
* @return void
*
* @throws \RuntimeException
*/
protected function typeComputed(Fluent $column)
{
throw new RuntimeException('This database driver does not support the computed type.');
}
/**
* Add the column modifiers to the definition.
*
* @param string $sql
* @param \Illuminate\Database\Schema\Blueprint $blueprint
* @param \Illuminate\Support\Fluent $column
* @return string
*/
protected function addModifiers($sql, Blueprint $blueprint, Fluent $column)
{
foreach ($this->modifiers as $modifier) {
if (method_exists($this, $method = "modify{$modifier}")) {
$sql .= $this->{$method}($blueprint, $column);
}
}
return $sql;
}
/**
* Get the primary key command if it exists on the blueprint.
*
* @param \Illuminate\Database\Schema\Blueprint $blueprint
* @param string $name
* @return \Illuminate\Support\Fluent|null
*/
protected function getCommandByName(Blueprint $blueprint, $name)
{
$commands = $this->getCommandsByName($blueprint, $name);
if (count($commands) > 0) {
return reset($commands);
}
}
/**
* Get all of the commands with a given name.
*
* @param \Illuminate\Database\Schema\Blueprint $blueprint
* @param string $name
* @return array
*/
protected function getCommandsByName(Blueprint $blueprint, $name)
{
return array_filter($blueprint->getCommands(), function ($value) use ($name) {
return $value->name == $name;
});
}
/**
* Add a prefix to an array of values.
*
* @param string $prefix
* @param array $values
* @return array
*/
public function prefixArray($prefix, array $values)
{
return array_map(function ($value) use ($prefix) {
return $prefix.' '.$value;
}, $values);
}
/**
* Wrap a table in keyword identifiers.
*
* @param mixed $table
* @return string
*/
public function wrapTable($table)
{
return parent::wrapTable(
$table instanceof Blueprint ? $table->getTable() : $table
);
}
/**
* Wrap a value in keyword identifiers.
*
* @param \Illuminate\Database\Query\Expression|string $value
* @param bool $prefixAlias
* @return string
*/
public function wrap($value, $prefixAlias = false)
{
return parent::wrap(
$value instanceof Fluent ? $value->name : $value, $prefixAlias
);
}
/**
* Format a value so that it can be used in "default" clauses.
*
* @param mixed $value
* @return string
*/
protected function getDefaultValue($value)
{
if ($value instanceof Expression) {
return $value;
}
return is_bool($value)
? "'".(int) $value."'"
: "'".(string) $value."'";
}
/**
* Create an empty Doctrine DBAL TableDiff from the Blueprint.
*
* @param \Illuminate\Database\Schema\Blueprint $blueprint
* @param \Doctrine\DBAL\Schema\AbstractSchemaManager $schema
* @return \Doctrine\DBAL\Schema\TableDiff
*/
public function getDoctrineTableDiff(Blueprint $blueprint, SchemaManager $schema)
{
$table = $this->getTablePrefix().$blueprint->getTable();
return tap(new TableDiff($table), function ($tableDiff) use ($schema, $table) {
$tableDiff->fromTable = $schema->listTableDetails($table);
});
}
/**
* Get the fluent commands for the grammar.
*
* @return array
*/
public function getFluentCommands()
{
return $this->fluentCommands;
}
/**
* Check if this Grammar supports schema changes wrapped in a transaction.
*
* @return bool
*/
public function supportsSchemaTransactions()
{
return $this->transactions;
}
}