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<?php |
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namespace SilverStripe\PostgreSQL; |
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use SilverStripe\ORM\Queries\SQLConditionalExpression; |
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use SilverStripe\ORM\Queries\SQLExpression; |
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use SilverStripe\ORM\Queries\SQLSelect; |
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use SilverStripe\ORM\Connect\DBQueryBuilder; |
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use InvalidArgumentException; |
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class PostgreSQLQueryBuilder extends DBQueryBuilder |
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{ |
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/** |
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* Max table length. |
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* Aliases longer than this will be re-written |
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*/ |
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const MAX_TABLE = 63; |
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/** |
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* Return the LIMIT clause ready for inserting into a query. |
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* |
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* @param SQLSelect $query The expression object to build from |
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* @param array $parameters Out parameter for the resulting query parameters |
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* @return string The finalised limit SQL fragment |
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*/ |
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public function buildLimitFragment(SQLSelect $query, array &$parameters) |
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{ |
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$nl = $this->getSeparator(); |
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// Ensure limit is given |
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$limit = $query->getLimit(); |
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if (empty($limit)) { |
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return ''; |
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} |
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// For literal values return this as the limit SQL |
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if (! is_array($limit)) { |
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return "{$nl}LIMIT $limit"; |
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} |
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// Assert that the array version provides the 'limit' key |
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if (! array_key_exists('limit', $limit) || ($limit['limit'] !== null && ! is_numeric($limit['limit']))) { |
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throw new InvalidArgumentException( |
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'DBQueryBuilder::buildLimitSQL(): Wrong format for $limit: '. var_export($limit, true) |
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); |
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} |
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if ($limit['limit'] === null) { |
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$limit['limit'] = 'ALL'; |
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} |
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$clause = "{$nl}LIMIT {$limit['limit']}"; |
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if (isset($limit['start']) && is_numeric($limit['start']) && $limit['start'] !== 0) { |
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$clause .= " OFFSET {$limit['start']}"; |
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} |
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return $clause; |
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} |
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public function buildSQL(SQLExpression $query, &$parameters) |
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{ |
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$sql = parent::buildSQL($query, $parameters); |
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return $this->rewriteLongIdentifiers($query, $sql); |
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} |
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/** |
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* Find and generate table aliases necessary in the given query |
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* |
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* @param SQLConditionalExpression $query |
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* @return array List of replacements |
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*/ |
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protected function findRewrites(SQLConditionalExpression $query) |
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{ |
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$rewrites = []; |
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foreach ($query->getFrom() as $alias => $from) { |
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$table = is_array($from) ? $from['table'] : $from; |
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if ($alias === $table || "\"{$alias}\"" === $table) { |
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continue; |
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} |
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// Don't complain about aliases shorter than max length |
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if (strlen($alias) <= self::MAX_TABLE) { |
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continue; |
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} |
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$replacement = substr(sha1($alias), 0, 7) . '_' . substr($alias, 8 - self::MAX_TABLE); |
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$rewrites["\"{$alias}\""] = "\"{$replacement}\""; |
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} |
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return $rewrites; |
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} |
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/** |
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* Rewrite all ` AS "Identifier"` with strlen(Identifier) > 63 |
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* |
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* @param SQLExpression $query |
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* @param string $sql |
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* @return string |
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*/ |
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protected function rewriteLongIdentifiers(SQLExpression $query, $sql) |
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{ |
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// Check if this query has aliases |
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if ($query instanceof SQLConditionalExpression) { |
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$rewrites = $this->findRewrites($query); |
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if ($rewrites) { |
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return str_replace(array_keys($rewrites), array_values($rewrites), $sql); |
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} |
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} |
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return $sql; |
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} |
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} |
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silverstripe /
silverstripe-postgresql
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