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<?php
/**
* This file is part of CodeIgniter 4 framework.
*
* (c) CodeIgniter Foundation <admin@codeigniter.com>
*
* For the full copyright and license information, please view
* the LICENSE file that was distributed with this source code.
*/
namespace CodeIgniter\Database\OCI8;
use CodeIgniter\Database\Forge as BaseForge;
/**
* Forge for OCI8
*/
class Forge extends BaseForge
{
/**
* DROP INDEX statement
*
* @var string
*/
protected $dropIndexStr = 'DROP INDEX %s';
/**
* CREATE DATABASE statement
*
* @var false
*/
protected $createDatabaseStr = false;
/**
* CREATE TABLE IF statement
*
* @var false
*/
protected $createTableIfStr = false;
/**
* DROP TABLE IF EXISTS statement
*
* @var false
*/
protected $dropTableIfStr = false;
/**
* DROP DATABASE statement
*
* @var false
*/
protected $dropDatabaseStr = false;
/**
* UNSIGNED support
*
* @var array|bool
*/
protected $unsigned = false;
/**
* NULL value representation in CREATE/ALTER TABLE statements
*
* @var string
*/
protected $null = 'NULL';
/**
* RENAME TABLE statement
*
* @var string
*/
protected $renameTableStr = 'ALTER TABLE %s RENAME TO %s';
/**
* DROP CONSTRAINT statement
*
* @var string
*/
protected $dropConstraintStr = 'ALTER TABLE %s DROP CONSTRAINT %s';
/**
* ALTER TABLE
*
* @param string $alterType ALTER type
* @param string $table Table name
* @param mixed $field Column definition
*
* @return string|string[]
*/
protected function _alterTable(string $alterType, string $table, $field)
{
$sql = 'ALTER TABLE ' . $this->db->escapeIdentifiers($table);
if ($alterType === 'DROP') {
$fields = array_map(fn ($field) => $this->db->escapeIdentifiers(trim($field)), is_string($field) ? explode(',', $field) : $field);
return $sql . ' DROP (' . implode(',', $fields) . ') CASCADE CONSTRAINT INVALIDATE';
}
if ($alterType === 'CHANGE') {
$alterType = 'MODIFY';
}
$nullableMap = array_column($this->db->getFieldData($table), 'nullable', 'name');
$sqls = [];
for ($i = 0, $c = count($field); $i < $c; $i++) {
if ($alterType === 'MODIFY') {
// If a null constraint is added to a column with a null constraint,
// ORA-01451 will occur,
// so add null constraint is used only when it is different from the current null constraint.
$isWantToAddNull = strpos($field[$i]['null'], ' NOT') === false;
$currentNullAddable = $nullableMap[$field[$i]['name']];
if ($isWantToAddNull === $currentNullAddable) {
$field[$i]['null'] = '';
}
}
if ($field[$i]['_literal'] !== false) {
$field[$i] = "\n\t" . $field[$i]['_literal'];
} else {
$field[$i]['_literal'] = "\n\t" . $this->_processColumn($field[$i]);
if (! empty($field[$i]['comment'])) {
$sqls[] = 'COMMENT ON COLUMN '
. $this->db->escapeIdentifiers($table) . '.' . $this->db->escapeIdentifiers($field[$i]['name'])
. ' IS ' . $field[$i]['comment'];
}
if ($alterType === 'MODIFY' && ! empty($field[$i]['new_name'])) {
$sqls[] = $sql . ' RENAME COLUMN ' . $this->db->escapeIdentifiers($field[$i]['name'])
. ' TO ' . $this->db->escapeIdentifiers($field[$i]['new_name']);
}
$field[$i] = "\n\t" . $field[$i]['_literal'];
}
}
$sql .= ' ' . $alterType . ' ';
$sql .= count($field) === 1
? $field[0]
: '(' . implode(',', $field) . ')';
// RENAME COLUMN must be executed after MODIFY
array_unshift($sqls, $sql);
return $sqls;
}
/**
* Field attribute AUTO_INCREMENT
*
* @return void
*/
protected function _attributeAutoIncrement(array &$attributes, array &$field)
{
if (! empty($attributes['AUTO_INCREMENT']) && $attributes['AUTO_INCREMENT'] === true
&& stripos($field['type'], 'NUMBER') !== false
&& version_compare($this->db->getVersion(), '12.1', '>=')
) {
$field['auto_increment'] = ' GENERATED BY DEFAULT AS IDENTITY';
}
}
/**
* Process column
*/
protected function _processColumn(array $field): string
{
$constraint = '';
// @todo: can’t cover multi pattern when set type.
if ($field['type'] === 'VARCHAR2' && strpos($field['length'], "('") === 0) {
$constraint = ' CHECK(' . $this->db->escapeIdentifiers($field['name'])
. ' IN ' . $field['length'] . ')';
$field['length'] = '(' . max(array_map('mb_strlen', explode("','", mb_substr($field['length'], 2, -2)))) . ')' . $constraint;
} elseif (count($this->primaryKeys) === 1 && $field['name'] === $this->primaryKeys[0]) {
$field['unique'] = '';
}
return $this->db->escapeIdentifiers($field['name'])
. ' ' . $field['type'] . $field['length']
. $field['unsigned']
. $field['default']
. $field['auto_increment']
. $field['null']
. $field['unique'];
}
/**
* Performs a data type mapping between different databases.
*
* @return void
*/
protected function _attributeType(array &$attributes)
{
// Reset field lengths for data types that don't support it
// Usually overridden by drivers
switch (strtoupper($attributes['TYPE'])) {
case 'TINYINT':
$attributes['CONSTRAINT'] ??= 3;
// no break
case 'SMALLINT':
$attributes['CONSTRAINT'] ??= 5;
// no break
case 'MEDIUMINT':
$attributes['CONSTRAINT'] ??= 7;
// no break
case 'INT':
case 'INTEGER':
$attributes['CONSTRAINT'] ??= 11;
// no break
case 'BIGINT':
$attributes['CONSTRAINT'] ??= 19;
// no break
case 'NUMERIC':
$attributes['TYPE'] = 'NUMBER';
return;
case 'BOOLEAN':
$attributes['TYPE'] = 'NUMBER';
$attributes['CONSTRAINT'] = 1;
$attributes['UNSIGNED'] = true;
$attributes['NULL'] = false;
return;
case 'DOUBLE':
$attributes['TYPE'] = 'FLOAT';
$attributes['CONSTRAINT'] ??= 126;
return;
case 'DATETIME':
case 'TIME':
$attributes['TYPE'] = 'DATE';
return;
case 'SET':
case 'ENUM':
case 'VARCHAR':
$attributes['CONSTRAINT'] ??= 255;
// no break
case 'TEXT':
case 'MEDIUMTEXT':
$attributes['CONSTRAINT'] ??= 4000;
$attributes['TYPE'] = 'VARCHAR2';
}
}
/**
* Generates a platform-specific DROP TABLE string
*
* @return bool|string
*/
protected function _dropTable(string $table, bool $ifExists, bool $cascade)
{
$sql = parent::_dropTable($table, $ifExists, $cascade);
if ($sql !== true && $cascade === true) {
$sql .= ' CASCADE CONSTRAINTS PURGE';
} elseif ($sql !== true) {
$sql .= ' PURGE';
}
return $sql;
}
protected function _processForeignKeys(string $table): string
{
$sql = '';
$allowActions = [
'CASCADE',
'SET NULL',
'NO ACTION',
];
foreach ($this->foreignKeys as $fkey) {
$nameIndex = $table . '_' . implode('_', $fkey['field']) . '_fk';
$nameIndexFilled = $this->db->escapeIdentifiers($nameIndex);
$foreignKeyFilled = implode(', ', $this->db->escapeIdentifiers($fkey['field']));
$referenceTableFilled = $this->db->escapeIdentifiers($this->db->DBPrefix . $fkey['referenceTable']);
$referenceFieldFilled = implode(', ', $this->db->escapeIdentifiers($fkey['referenceField']));
$formatSql = ",\n\tCONSTRAINT %s FOREIGN KEY (%s) REFERENCES %s(%s)";
$sql .= sprintf($formatSql, $nameIndexFilled, $foreignKeyFilled, $referenceTableFilled, $referenceFieldFilled);
if ($fkey['onDelete'] !== false && in_array($fkey['onDelete'], $allowActions, true)) {
$sql .= ' ON DELETE ' . $fkey['onDelete'];
}
}
return $sql;
}
}
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