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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\BaseBuilder;
use CodeIgniter\Database\Exceptions\DatabaseException;
/**
* Builder for OCI8
*/
class Builder extends BaseBuilder
{
/**
* Identifier escape character
*
* @var string
*/
protected $escapeChar = '"';
/**
* ORDER BY random keyword
*
* @var array
*/
protected $randomKeyword = [
'"DBMS_RANDOM"."RANDOM"',
];
/**
* COUNT string
*
* @used-by CI_DB_driver::count_all()
* @used-by BaseBuilder::count_all_results()
*
* @var string
*/
protected $countString = 'SELECT COUNT(1) ';
/**
* Limit used flag
*
* If we use LIMIT, we'll add a field that will
* throw off num_fields later.
*
* @var bool
*/
protected $limitUsed = false;
/**
* A reference to the database connection.
*
* @var Connection
*/
protected $db;
/**
* Generates a platform-specific insert string from the supplied data.
*/
protected function _insertBatch(string $table, array $keys, array $values): string
{
$insertKeys = implode(', ', $keys);
$hasPrimaryKey = in_array('PRIMARY', array_column($this->db->getIndexData($table), 'type'), true);
// ORA-00001 measures
if ($hasPrimaryKey) {
$sql = 'INSERT INTO ' . $table . ' (' . $insertKeys . ") \n SELECT * FROM (\n";
$selectQueryValues = [];
foreach ($values as $value) {
$selectValues = implode(',', array_map(static fn ($value, $key) => $value . ' as ' . $key, explode(',', substr(substr($value, 1), 0, -1)), $keys));
$selectQueryValues[] = 'SELECT ' . $selectValues . ' FROM DUAL';
}
return $sql . implode("\n UNION ALL \n", $selectQueryValues) . "\n)";
}
$sql = "INSERT ALL\n";
foreach ($values as $value) {
$sql .= ' INTO ' . $table . ' (' . $insertKeys . ') VALUES ' . $value . "\n";
}
return $sql . 'SELECT * FROM DUAL';
}
/**
* Generates a platform-specific replace string from the supplied data
*/
protected function _replace(string $table, array $keys, array $values): string
{
$fieldNames = array_map(static fn ($columnName) => trim($columnName, '"'), $keys);
$uniqueIndexes = array_filter($this->db->getIndexData($table), static function ($index) use ($fieldNames) {
$hasAllFields = count(array_intersect($index->fields, $fieldNames)) === count($index->fields);
return ($index->type === 'PRIMARY') && $hasAllFields;
});
$replaceableFields = array_filter($keys, static function ($columnName) use ($uniqueIndexes) {
foreach ($uniqueIndexes as $index) {
if (in_array(trim($columnName, '"'), $index->fields, true)) {
return false;
}
}
return true;
});
$sql = 'MERGE INTO ' . $table . "\n USING (SELECT ";
$sql .= implode(', ', array_map(static fn ($columnName, $value) => $value . ' ' . $columnName, $keys, $values));
$sql .= ' FROM DUAL) "_replace" ON ( ';
$onList = [];
$onList[] = '1 != 1';
foreach ($uniqueIndexes as $index) {
$onList[] = '(' . implode(' AND ', array_map(static fn ($columnName) => $table . '."' . $columnName . '" = "_replace"."' . $columnName . '"', $index->fields)) . ')';
}
$sql .= implode(' OR ', $onList) . ') WHEN MATCHED THEN UPDATE SET ';
$sql .= implode(', ', array_map(static fn ($columnName) => $columnName . ' = "_replace".' . $columnName, $replaceableFields));
$sql .= ' WHEN NOT MATCHED THEN INSERT (' . implode(', ', $replaceableFields) . ') VALUES ';
return $sql . (' (' . implode(', ', array_map(static fn ($columnName) => '"_replace".' . $columnName, $replaceableFields)) . ')');
}
/**
* Generates a platform-specific truncate string from the supplied data
*
* If the database does not support the truncate() command,
* then this method maps to 'DELETE FROM table'
*/
protected function _truncate(string $table): string
{
return 'TRUNCATE TABLE ' . $table;
}
/**
* Compiles a delete string and runs the query
*
* @param mixed $where
*
* @throws DatabaseException
*
* @return mixed
*/
public function delete($where = '', ?int $limit = null, bool $resetData = true)
{
if (! empty($limit)) {
$this->QBLimit = $limit;
}
return parent::delete($where, null, $resetData);
}
/**
* Generates a platform-specific delete string from the supplied data
*/
protected function _delete(string $table): string
{
if ($this->QBLimit) {
$this->where('rownum <= ', $this->QBLimit, false);
$this->QBLimit = false;
}
return parent::_delete($table);
}
/**
* Generates a platform-specific update string from the supplied data
*/
protected function _update(string $table, array $values): string
{
$valStr = [];
foreach ($values as $key => $val) {
$valStr[] = $key . ' = ' . $val;
}
if ($this->QBLimit) {
$this->where('rownum <= ', $this->QBLimit, false);
}
return 'UPDATE ' . $this->compileIgnore('update') . $table . ' SET ' . implode(', ', $valStr)
. $this->compileWhereHaving('QBWhere')
. $this->compileOrderBy();
}
/**
* Generates a platform-specific LIMIT clause.
*/
protected function _limit(string $sql, bool $offsetIgnore = false): string
{
$offset = (int) ($offsetIgnore === false ? $this->QBOffset : 0);
if (version_compare($this->db->getVersion(), '12.1', '>=')) {
// OFFSET-FETCH can be used only with the ORDER BY clause
if (empty($this->QBOrderBy)) {
$sql .= ' ORDER BY 1';
}
return $sql . ' OFFSET ' . $offset . ' ROWS FETCH NEXT ' . $this->QBLimit . ' ROWS ONLY';
}
$this->limitUsed = true;
$limitTemplateQuery = 'SELECT * FROM (SELECT INNER_QUERY.*, ROWNUM RNUM FROM (%s) INNER_QUERY WHERE ROWNUM < %d)' . ($offset ? ' WHERE RNUM >= %d' : '');
return sprintf($limitTemplateQuery, $sql, $offset + $this->QBLimit + 1, $offset);
}
/**
* Resets the query builder values. Called by the get() function
*/
protected function resetSelect()
{
$this->limitUsed = false;
parent::resetSelect();
}
}
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