如何防止在InstallShield中记录自定义操作的执行步骤？(How to prevent to log execution steps of Custom Action in InstallShield?)

 尝试： 
 
function QueryStock($cat) {
    $query = "SELECT * FROM stock WHERE catno = " . $cat;
    global $wpdb;
    $row = $wpdb->get_row($query);
        $catno = $row->catno; //Column name in table
        $itemname = $row->itemname; //Column name in table
        $price = $row->price; //Column name in table
        $stock = $row->stock; //Column name in table

    echo "There are " . $stock . " bears";
}
 
 另外，我建议不要使用“SELECT *”。 尝试仅查询使用的列。 这对性能更好。 
 
 编辑：看到一个错字。 您的代码中有“$ catno == $ row ...”。 你应该只使用一个“=” 

Eureka!!!,
 
It's often something missed, and it was in the MySQL query.
 
The query should be SELECT * FROM stock WHERE catno = '$cat' making $query = "SELECT * FROM stock WHERE catno = '$cat'";
 
I have taken on board the "SELECT *" issue @eckes and @rickonline pointed out, went for separate queries and used $wpdb->get_var().
 
Working coding is..
 
function QueryStock($cat) {
    $query1 = "SELECT catno FROM stock WHERE catno = '$cat'";
    $query2 = "SELECT itemname FROM stock WHERE catno = '$cat'";
    $query3 = "SELECT price FROM stock WHERE catno = '$cat'";
    $query4 = "SELECT stock FROM stock WHERE catno = '$cat'";

    global $wpdb;

    $catno = $wpdb->get_var($query1);
    $itemname = $wpdb->get_var($query2);
    $price = $wpdb->get_var($query3);
    $stock = $wpdb->get_var($query4);

    echo "There are " . $stock . " bears";
}