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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\Postgre;
use CodeIgniter\Database\BaseBuilder;
use CodeIgniter\Database\Exceptions\DatabaseException;
use CodeIgniter\Database\RawSql;
/**
* Builder for Postgre
*/
class Builder extends BaseBuilder
{
/**
* ORDER BY random keyword
*
* @var array
*/
protected $randomKeyword = [
'RANDOM()',
];
/**
* Specifies which sql statements
* support the ignore option.
*
* @var array
*/
protected $supportedIgnoreStatements = [
'insert' => 'ON CONFLICT DO NOTHING',
];
/**
* Checks if the ignore option is supported by
* the Database Driver for the specific statement.
*
* @return string
*/
protected function compileIgnore(string $statement)
{
$sql = parent::compileIgnore($statement);
if (! empty($sql)) {
$sql = ' ' . trim($sql);
}
return $sql;
}
/**
* ORDER BY
*
* @param string $direction ASC, DESC or RANDOM
*
* @return BaseBuilder
*/
public function orderBy(string $orderBy, string $direction = '', ?bool $escape = null)
{
$direction = strtoupper(trim($direction));
if ($direction === 'RANDOM') {
if (ctype_digit($orderBy)) {
$orderBy = (float) ($orderBy > 1 ? "0.{$orderBy}" : $orderBy);
}
if (is_float($orderBy)) {
$this->db->simpleQuery("SET SEED {$orderBy}");
}
$orderBy = $this->randomKeyword[0];
$direction = '';
$escape = false;
}
return parent::orderBy($orderBy, $direction, $escape);
}
/**
* Increments a numeric column by the specified value.
*
* @throws DatabaseException
*
* @return mixed
*/
public function increment(string $column, int $value = 1)
{
$column = $this->db->protectIdentifiers($column);
$sql = $this->_update($this->QBFrom[0], [$column => "to_number({$column}, '9999999') + {$value}"]);
return $this->db->query($sql, $this->binds, false);
}
/**
* Decrements a numeric column by the specified value.
*
* @throws DatabaseException
*
* @return mixed
*/
public function decrement(string $column, int $value = 1)
{
$column = $this->db->protectIdentifiers($column);
$sql = $this->_update($this->QBFrom[0], [$column => "to_number({$column}, '9999999') - {$value}"]);
return $this->db->query($sql, $this->binds, false);
}
/**
* Compiles an replace into string and runs the query.
* Because PostgreSQL doesn't support the replace into command,
* we simply do a DELETE and an INSERT on the first key/value
* combo, assuming that it's either the primary key or a unique key.
*
* @param array|null $set An associative array of insert values
*
* @throws DatabaseException
*
* @return mixed
*/
public function replace(?array $set = null)
{
if ($set !== null) {
$this->set($set);
}
if (! $this->QBSet) {
if (CI_DEBUG) {
throw new DatabaseException('You must use the "set" method to update an entry.');
}
return false; // @codeCoverageIgnore
}
$table = $this->QBFrom[0];
$set = $this->binds;
array_walk($set, static function (array &$item) {
$item = $item[0];
});
$key = array_key_first($set);
$value = $set[$key];
$builder = $this->db->table($table);
$exists = $builder->where($key, $value, true)->get()->getFirstRow();
if (empty($exists) && $this->testMode) {
$result = $this->getCompiledInsert();
} elseif (empty($exists)) {
$result = $builder->insert($set);
} elseif ($this->testMode) {
$result = $this->where($key, $value, true)->getCompiledUpdate();
} else {
array_shift($set);
$result = $builder->where($key, $value, true)->update($set);
}
unset($builder);
$this->resetWrite();
return $result;
}
/**
* Generates a platform-specific insert string from the supplied data
*/
protected function _insert(string $table, array $keys, array $unescapedKeys): string
{
return trim(sprintf('INSERT INTO %s (%s) VALUES (%s) %s', $table, implode(', ', $keys), implode(', ', $unescapedKeys), $this->compileIgnore('insert')));
}
/**
* Generates a platform-specific insert string from the supplied data.
*/
protected function _insertBatch(string $table, array $keys, array $values): string
{
return trim(sprintf('INSERT INTO %s (%s) VALUES %s %s', $table, implode(', ', $keys), implode(', ', $values), $this->compileIgnore('insert')));
}
/**
* 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) || ! empty($this->QBLimit)) {
throw new DatabaseException('PostgreSQL does not allow LIMITs on DELETE queries.');
}
return parent::delete($where, $limit, $resetData);
}
/**
* Generates a platform-specific LIMIT clause.
*/
protected function _limit(string $sql, bool $offsetIgnore = false): string
{
return $sql . ' LIMIT ' . $this->QBLimit . ($this->QBOffset ? " OFFSET {$this->QBOffset}" : '');
}
/**
* Generates a platform-specific update string from the supplied data
*
* @throws DatabaseException
*/
protected function _update(string $table, array $values): string
{
if (! empty($this->QBLimit)) {
throw new DatabaseException('Postgres does not support LIMITs with UPDATE queries.');
}
$this->QBOrderBy = [];
return parent::_update($table, $values);
}
/**
* Generates a platform-specific batch update string from the supplied data
*/
protected function _updateBatch(string $table, array $values, string $index): string
{
$ids = [];
$final = [];
foreach ($values as $val) {
$ids[] = $val[$index];
foreach (array_keys($val) as $field) {
if ($field !== $index) {
$final[$field] ??= [];
$final[$field][] = "WHEN {$val[$index]} THEN {$val[$field]}";
}
}
}
$cases = '';
foreach ($final as $k => $v) {
$cases .= "{$k} = (CASE {$index}\n"
. implode("\n", $v)
. "\nELSE {$k} END), ";
}
$this->where("{$index} IN(" . implode(',', $ids) . ')', null, false);
return "UPDATE {$table} SET " . substr($cases, 0, -2) . $this->compileWhereHaving('QBWhere');
}
/**
* Generates a platform-specific delete string from the supplied data
*/
protected function _delete(string $table): string
{
$this->QBLimit = false;
return parent::_delete($table);
}
/**
* 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 . ' RESTART IDENTITY';
}
/**
* Platform independent LIKE statement builder.
*
* In PostgreSQL, the ILIKE operator will perform case insensitive
* searches according to the current locale.
*
* @see https://www.postgresql.org/docs/9.2/static/functions-matching.html
*/
protected function _like_statement(?string $prefix, string $column, ?string $not, string $bind, bool $insensitiveSearch = false): string
{
$op = $insensitiveSearch === true ? 'ILIKE' : 'LIKE';
return "{$prefix} {$column} {$not} {$op} :{$bind}:";
}
/**
* Generates the JOIN portion of the query
*
* @param RawSql|string $cond
*
* @return BaseBuilder
*/
public function join(string $table, $cond, string $type = '', ?bool $escape = null)
{
if (! in_array('FULL OUTER', $this->joinTypes, true)) {
$this->joinTypes = array_merge($this->joinTypes, ['FULL OUTER']);
}
return parent::join($table, $cond, $type, $escape);
}
}
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