PEAR DB准备/绑定值

Question

只是不能执行查询来打印绑定值。在执行前寻找调试查询。有小费吗？我知道我可以俯瞰简单的东西，唉......

$field1 = 'one'; 
$field2 = 'two'; 
$field3 = 'three'; 

$fields = 'SET '; 
$fields .= 'field1 = ?, '; 
$fields .= 'field2 = ?, '; 
$fields .= 'field3 = ? '; 

$vals[] = $field1; 
$vals[] = $field2; 
$vals[] = $field3; 

$sql = 'UPDATE table_name '.$fields.' WHERE id = 123'; 
$dbh = $db->prepare($sql); 

// this binds and executes the query but I would like to print the query with the bind values before executing 
$results = $db->execute($dbh, $vals); 

UPDATE：

我会做这样的事情与sprinf

$field1 = 'one'; 
$field2 = 'two'; 
$field3 = 'three'; 

$fields = 'SET '; 
$fields .= 'field1 = %s, '; 
$fields .= 'field2 = %s, '; 
$fields .= 'field3 = %s '; 

$vals[] = $field1; 
$vals[] = $field2; 
$vals[] = $field3; 

$sql = 'UPDATE table_name '.$fields.' WHERE id = 123'; 

$query = sprintf($sql, $field1, $field2, $field3); 
echo "Query before execution: ".$query."<br />"; 

Answer 1

你不能进去的值这样的查询。服务器处理预备查询的方式不同。

你可以做的最好的是：

echo $sql; 
print_r($vals); 

Retrieve (or simulate) full query from PDO prepared statement