假设我们要在表格中插入多行:
$rows = [(1,2,3), (4,5,6), (7,8,9) ... ] //[ array of values ];
使用PDO:
$sql = "insert into `table_name` (col1, col2, col3) values (?, ?, ?)" ;
现在,您应该如何继续插入行?像这样?
$stmt = $db->prepare($sql); foreach($rows as $row){ $stmt->execute($row); }
还是像这样?
$sql = "insert into `table_name` (col1, col2, col3) values "; $sql .= //not sure the best way to concatenate all the values, use implode? $db->prepare($sql)->execute();
哪种方法更快更安全?插入多行的最佳方法是什么?
您至少有以下两个选择:
$rows = [(1,2,3), (4,5,6), (7,8,9) ... ]; $sql = "insert into `table_name` (col1, col2, col3) values (?,?,?)"; $stmt = $db->prepare($sql); foreach($rows as $row) { $stmt->execute($row); } OR: $rows = [(1,2,3), (4,5,6), (7,8,9) ... ]; $sql = "insert into `table_name` (col1, col2, col3) values "; $paramArray = array(); $sqlArray = array(); foreach($rows as $row) { $sqlArray[] = '(' . implode(',', array_fill(0, count($row), '?')) . ')'; foreach($row as $element) { $paramArray[] = $element; } } // $sqlArray will look like: ["(?,?,?)", "(?,?,?)", ... ] // Your $paramArray will basically be a flattened version of $rows. $sql .= implode(',', $sqlArray); $stmt = $db->prepare($sql); $stmt->execute($paramArray);
如您所见,第一个版本具有许多简单的代码;但是第二个版本确实执行了批量插入。批处理插入应该更快,但是我同意 @BillKarwin的观点 ,在绝大多数实现中性能差异不会被注意到。