OCI_BIND_BY_NAME 中的异常行为

Question

我使用以下代码通过 oci_bind_by_name 绑定变量，但即使有多行可用，也只返回单行。

<?php 
    $queryArr = array(11423,24242,2463,23434);
    $sqlarr = array();
    for ($i = 0; $i < count($queryArr); $i++) {
        array_push($sqlarr, ":B$i");
    }
    $sqlstr = implode(",", $sqlarr);
    $sql = "SELECT COL1, COL2, STATUS FROM TAB1 WHERE P_KEY = :USR_ID AND S_COL IN (" . $sqlstr . ") ORDER BY STATUS";
    $this->sth = oci_parse($this->con, $sql);
    oci_bind_by_name($this->sth, ":USR_ID", $usrid);
    for ($i = 0; $i < count($queryArr); $i++) {
        $bid = $queryArr[$i];
        oci_bind_by_name($this->sth, ":B$i", $bid);
    }
    oci_execute($this->sth);
?>

在花了 3 个小时查找代码中的错误后，我发现问题出在 OCI_BIND_BY_NAME。我将上面的代码更改如下，现在我得到了所有行。

<?php 
    $queryArr = array(11423,24242,2463,23434);
    $sqlarr = array();
    for ($i = 0; $i < count($queryArr); $i++) {
        array_push($sqlarr, ":B$i");
    }
    $sqlstr = implode(",", $sqlarr);
    $sql = "SELECT COL1, COL2, STATUS FROM TAB1 WHERE P_KEY = :USR_ID AND S_COL IN (" . $sqlstr . ") ORDER BY STATUS";
    $this->sth = oci_parse($this->con, $sql);
    oci_bind_by_name($this->sth, ":USR_ID", $usrid);
    for ($i = 0; $i < count($queryArr); $i++) {
    //Changed code --START--
        $bindName = ":B".$i;
        oci_bind_by_name($this->sth, $bindName, $queryArr[$i]);
    //Changed code --END--
    }
    oci_execute($this->sth);
?>

谁能解释一下这背后的原因...？

总结一下：

When creating a variable by appending string and using it in OCI_BIND_BY_NAME then it's working fine but when I am directly appending string in the function then it's not working correctly. Also, it's not giving any error message. It's getting executed but returning only single row.

Answer 1

您的第一个示例是在每次迭代中绑定 $bid，即重复使用相同的变量位置（内存地址）。请参阅 oci_bind_by_name() documentation 中的相关示例 'Example #3 Binding with a foreach() loop':

foreach ($ba as $key => $val) {

    // oci_bind_by_name($stid, $key, $val) does not work
    // because it binds each placeholder to the same location: $val
    // instead use the actual location of the data: $ba[$key]
    oci_bind_by_name($stid, $key, $ba[$key]);
}