Oracle 内连接头痛 oci_execute(): ORA-00920: 无效的关系运算符

Question

我正在尝试使用两个表完成内部联接（Oracle 称它们为等联接），但我只是缺少一些东西，因为它与 MySQL 内部联接不同。我也是 PHP 的新手（来自 Lasso），所以为了我自己的理智，我试图严格使用我的语法。我查看了有关此错误的所有其他帖子，但没有帮助。

使用 PHP 5.5.29 连接到 Oracle 12c 数据库，OCI8 已安装并在 php 信息页面中进行验证。

Oracle's explanation of inner joins

$login 是明文，$pw 在这个 sn-p 之前被散列：

// separate the login types by the "_" character
if (strpos($login, "_") == true) {
    $fieldname = 'web_password_hash';
    $dynfield = 'web_id';
    $dynfield1 = 's.web_id';
} else {
    $fieldname = 'student_web_password_hash';
    $dynfield = 'student_web_id';
    $dynfield1 = 's.student_web_id';
}

$schoolid = '(pcs.schoolid=4 OR pcs.schoolid=5)';

// search custom table for a field with the correct password (parent/student)
$dbc = oci_connect($psusername, $pspassword, $psconnection);

if(!$dbc) {
    echo "Oracle Not connected";
} else {

$stmt = oci_parse($dbc, 'SELECT pcs.student_number AS snumber, :dynfield1 AS loginid, s.ID AS sid, s.family_ident AS famid, s.firstname AS fname, s.last_name AS lname, s.grade_level AS gradelevel 
    FROM pvsis_custom_students pcs, students s 
        WHERE pcs.student_number=s.student_number 
            AND :schoolid 
            AND pcs.field_name=:fieldname 
            AND pcs.string_value=:pw 
            AND s.enroll_status=0;');

// bind parameters to prevent SQL injection         
oci_bind_by_name($stmt, ':dynfield1', $dynfield1);          
oci_bind_by_name($stmt, ':fieldname', $fieldname);
oci_bind_by_name($stmt, ':schoolid', $schoolid);
oci_bind_by_name($stmt, ':pw', $pw);

// execute statement
oci_execute($stmt);

然后我得到的错误是：警告： oci_execute(): ORA-00920: invalid relational operator in /path/to/file line XXX

Answer 1

您无法像在此处那样绑定字段名称。您需要动态构建查询：

$stmt = oci_parse($dbc, 'SELECT pcs.student_number AS snumber, ' . $dynfield1 . ' AS loginid, s.ID AS sid, s.family_ident AS famid, s.firstname AS fname, s.last_name AS lname, s.grade_level AS gradelevel 
    FROM pvsis_custom_students pcs, students s 
        WHERE pcs.student_number=s.student_number 
            AND ' . $schoolid . '
            AND pcs.field_name=' . $fieldname . '
            AND pcs.string_value=:pw 
            AND s.enroll_status=0;');

删除对:dynfield1、:fieldname 和:schoolid 的bind_by_name 调用。

祝你好运。