使用Oracle和PHP:在SQL Developer中有效，但PHP文件结果ORA-00900:语句无效

Question

当我从我之前的文章“使用Oracle将三个表与PIVOT结合起来”中的代码，并在SQL开发人员中点击“运行脚本”时，一切都非常完美，但是当我试图从PHP文件中执行相同的脚本时，我得到了“ORA-00900无效的SQL语句”-错误。SQL开发人员“运行语句”也无法执行代码。我的代码似乎不在“SQL语句”语法中？

用于将sql脚本放入变量的PHP代码：

$sql = "variable x REFCURSOR
DECLARE
    exam_ids   VARCHAR2(255);
BEGIN
    SELECT
        LISTAGG(''''
                  || exam_id
                  || ''' AS \"'
                  || exam_name
                  || '\"',',') WITHIN GROUP(
            ORDER BY
                exam_id ASC
        )
    INTO exam_ids
    FROM
        exam;

    OPEN :x FOR 'SELECT
        *
               FROM
        (
            SELECT
                u.user_id,
                u.user_name,
                e.exam_id,
                eu.exam_date
            FROM
                users u
                LEFT JOIN exam_user eu ON u.user_id = eu.user_id
                LEFT JOIN exam e ON e.exam_id = eu.exam_id
            ORDER BY
                u.user_id
        )
            PIVOT ( MAX ( exam_date )
                FOR exam_id
                IN ( ' || EXAM_IDS || ' )
            )
    ORDER BY
        1';
END;
/

print x";

然后我将$sql变量传递给函数以获得结果：

function getSQLResult($sql, $conn) {
    $stmt = OCIParse($conn, $sql);

    if( $stmt === false ) {
        errorShutdown(__('...'), __('...'));
        die();
    } else {
        //Executes a statement
        if (OCIExecute($stmt)) {
            return $stmt;
        }
        else {
          $err = oci_error($stmt);
          echo '<pre>';
          print_r($err);
          echo '</pre>';
          return false;
        }
    }
}

那么有人能告诉我如何重构代码吗？

感谢任何帮助！

Answer 1

我想我明白了。似乎需要从PL/SQL脚本中创建一个过程：

CREATE OR REPLACE PROCEDURE getExamStatus(RC OUT SYS_REFCURSOR) AS
    exam_ids   VARCHAR2(255);
BEGIN
    SELECT
        LISTAGG(''''
                  || exam_id
                  || ''' AS \"'
                  || exam_name
                  || '\"',',') WITHIN GROUP(
            ORDER BY
                exam_id ASC
        )
    INTO exam_ids
    FROM
        exam;

    OPEN rc FOR 'SELECT
        *
               FROM
        (
            SELECT
                u.user_id,
                u.user_name,
                e.exam_id,
                eu.exam_date
            FROM
                users u
                LEFT JOIN exam_user eu ON u.user_id = eu.user_id
                LEFT JOIN exam e ON e.exam_id = eu.exam_id
            ORDER BY
                u.user_id
        )
            PIVOT ( MAX ( exam_date )
                FOR exam_id
                IN ( ' || EXAM_IDS || ' )
            )
    ORDER BY
        1';
END;
/

然后在数据库中运行该过程。之后，在PHP文件中，我必须重构sql语句：

$sql = "BEGIN getExamStatus(:rc); END;";

和功能：

function getSQLResult($sql, $conn) {
    $stmt = oci_parse($conn, $sql);

    if( $stmt === false ) {
        errorShutdown(__('...'), __('...'));
        die();
    } else {
        $rc = oci_new_cursor($conn);
        oci_bind_by_name($stmt, ':rc', $rc, -1, OCI_B_CURSOR);
        if(!oci_execute($stmt)) {
            return false;
            //return oci_error($stmt);
        }
        if(!oci_execute($rc)) {
            return false;
            //return oci_error($stmt);
        }
        $results = array();
        while (($row = oci_fetch_array($rc, OCI_ASSOC+OCI_RETURN_NULLS)) != false) {
            $results[] = $row;
        }
        oci_free_statement($stmt);
        oci_free_statement($rc);
        return $results;
    }
}