silverstripe-sqlite3/code/SQLite3QueryBuilder.php
2015-05-04 15:35:35 +01:00

93 lines
2.7 KiB
PHP

<?php
/**
* Builds a SQL query string from a SQLExpression object
*
* @package SQLite3
*/
class SQLite3QueryBuilder extends DBQueryBuilder {
/**
* @param SQLInsert $query
* @param array $parameters
* @return string
*/
protected function buildInsertQuery(SQLInsert $query, array &$parameters) {
// Multi-row insert requires SQLite specific syntax prior to 3.7.11
// For backwards compatibility reasons include the "union all select" syntax
$nl = $this->getSeparator();
$into = $query->getInto();
// Column identifiers
$columns = $query->getColumns();
// Build all rows
$rowParts = array();
foreach($query->getRows() as $row) {
// Build all columns in this row
$assignments = $row->getAssignments();
// Join SET components together, considering parameters
$parts = array();
foreach($columns as $column) {
// Check if this column has a value for this row
if(isset($assignments[$column])) {
// Assigment is a single item array, expand with a loop here
foreach($assignments[$column] as $assignmentSQL => $assignmentParameters) {
$parts[] = $assignmentSQL;
$parameters = array_merge($parameters, $assignmentParameters);
break;
}
} else {
// This row is missing a value for a column used by another row
$parts[] = '?';
$parameters[] = null;
}
}
$rowParts[] = implode(', ', $parts);
}
$columnSQL = implode(', ', $columns);
$sql = "INSERT INTO {$into}{$nl}($columnSQL){$nl}SELECT " . implode("{$nl}UNION ALL SELECT ", $rowParts);
return $sql;
}
/**
* Return the LIMIT clause ready for inserting into a query.
*
* @param SQLSelect $query The expression object to build from
* @param array $parameters Out parameter for the resulting query parameters
* @return string The finalised limit SQL fragment
*/
public function buildLimitFragment(SQLSelect $query, array &$parameters) {
$nl = $this->getSeparator();
// Ensure limit is given
$limit = $query->getLimit();
if(empty($limit)) return '';
// For literal values return this as the limit SQL
if( ! is_array($limit)) {
return "{$nl}LIMIT $limit";
}
// Assert that the array version provides the 'limit' key
if( ! array_key_exists('limit', $limit) || ($limit['limit'] !== null && ! is_numeric($limit['limit']))) {
throw new InvalidArgumentException(
'SQLite3QueryBuilder::buildLimitSQL(): Wrong format for $limit: '. var_export($limit, true)
);
}
$clause = "{$nl}";
if($limit['limit'] !== null) {
$clause .= "LIMIT {$limit['limit']} ";
}
if(isset($limit['start']) && is_numeric($limit['start']) && $limit['start'] !== 0) {
$clause .= "OFFSET {$limit['start']}";
}
return $clause;
}
}