Question

我正在尝试运行预备语句，但我遇到了错误。

这是我的疑问：

SET GLOBAL group_concat_max_len=4294967295;
SET @SQL = NULL;
SET @start_date = '2018-06-03';
SET @end_date = '2018-06-09';

    SELECT
    GROUP_CONCAT(DISTINCT
        CONCAT(
        'SUM(CASE WHEN date = "',DATE(issuedDateTime),'" THEN lunchStatus ELSE 0 END) AS `',DATE(issuedDateTime),'`'
        )
    ) INTO @SQL

        FROM `lunch_status` 
        WHERE DATE(issuedDateTime) BETWEEN @start_date AND @end_date;

    SET @SQL 
    = CONCAT('SELECT userId, ', @SQL, ' 
    FROM
    (
        SELECT userId, lunchStatus, DATE(issuedDateTime) as date 
        FROM `lunch_status` 
        WHERE DATE(issuedDateTime) BETWEEN "',@start_date,'" AND "',@end_date,'" 
    ) as a
    GROUP BY userId;');

SELECT @SQL; /* executing upto this part, SQL variable stores expected query string.

/* including this part, gives error . */
PREPARE stmt FROM @SQL;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

此SQL变量提供所需的查询字符串：

SELECT userId, 
SUM(CASE WHEN date = "2018-06-03" THEN lunchStatus ELSE 0 END) AS `2018-06-03`,
SUM(CASE WHEN date = "2018-06-04" THEN lunchStatus ELSE 0 END) AS `2018-06-04`,
SUM(CASE WHEN date = "2018-06-06" THEN lunchStatus ELSE 0 END) AS `2018-06-06`,
SUM(CASE WHEN date = "2018-06-07" THEN lunchStatus ELSE 0 END) AS `2018-06-07`,
SUM(CASE WHEN date = "2018-06-08" THEN lunchStatus ELSE 0 END) AS `2018-06-08` 
   FROM
   (
       SELECT userId, lunchStatus, DATE(issuedDateTime) as date 
       FROM `lunch_status` 
       WHERE DATE(issuedDateTime) BETWEEN "2018-06-03" AND "2018-06-09" 
   ) as a
   GROUP BY userId;

如果单独运行此查询，则会产生预期的结果集。

但是当试图将其作为准备好的声明执行时，它会发出错误。

错误：

Fatal error: Uncaught Error: Call to a member function getClauses() on null in C:\xampp\phpMyAdmin\vendor\phpmyadmin\sql-parser\src\Utils\Query.php:564 Stack trace: #0 C:\xampp\phpMyAdmin\vendor\phpmyadmin\sql-parser\src\Utils\Query.php(681): PhpMyAdmin\SqlParser\Utils\Query::getClause(NULL, NULL, 'ORDER BY', -1, false) #1 C:\xampp\phpMyAdmin\libraries\DisplayResults.php(1385): PhpMyAdmin\SqlParser\Utils\Query::replaceClause(NULL, NULL, 'ORDER BY', '') #2 C:\xampp\phpMyAdmin\libraries\DisplayResults.php(4376): PMA\libraries\DisplayResults->_getUnsortedSqlAndSortByKeyDropDown(Array, '') #3 C:\xampp\phpMyAdmin\libraries\sql.lib.php(1689): PMA\libraries\DisplayResults->getTable(Object(mysqli_result), Array, Array, false) #4 C:\xampp\phpMyAdmin\libraries\sql.lib.php(1980): PMA_getHtmlForSqlQueryResultsTable(Object(PMA\libraries\DisplayResults), './themes/pmahom...', NULL, Array, false, 122, 122, NULL, Object(mysqli_result), Array) #5 C:\xampp\phpMyAdmin\libraries\sql.lib.php(2199): PMA_getQueryResponseForResultsReturned(Objec in C:\xampp\phpMyAdmin\vendor\phpmyadmin\sql-parser\src\Utils\Query.php on line 564

有没有其他方法可以在不使用预准备语句的情况下直接执行此String变量？

sql string执行没有预处理语句

0 个答案: