我们可以直接在Query中给php-oracle中的绑定变量吗？

Currently i am executing the code like this to access data from oracle db

$fetchVals ="select  name, address from address_table where id_no=:number";
$parseStmt = oci_parse($conn, $fetchVals);

oci_bind_by_name($parseStmt, ':number', $numVal);
oci_execute($parseStmt);

My first question is, Can I use the code below to achieve the same result?

$fetchVals ="select  name, address from address_table where id_no='$numVal'";
$parseStmt = oci_parse($conn, $fetchVals);

//oci_bind_by_name($parseStmt, ':number', $numVal);
oci_execute($parseStmt);

I checked it, and I am getting the correct result.

My second question is, does this code pose any other problems? If so, please explain.

Thanks