Question

我希望在范围内的某些列（唯一）值增加1，然后运行它;

java -cp .:filepath/mysql-connector-java-5.1.35-bin.jar App

但它会引发重复输入错误。但如果查询完全运行，那么不会重复

update policy set ORDERNUMBER = ORDERNUMBER +1 where ORDERNUMBER between 3 and 5

查询后我想要这个：

ORDERNUMBER
1
2
3
4
5

Answer 1

尝试切换5和3，使其显示为：

update policy set ORDERNUMBER = ORDERNUMBER +1 where ORDERNUMBER between 3 and 5

更新： ORDERNUMBER似乎有一个独特的约束。你不能简单地添加一个，因为它将具有与另一行相同的值。使用这样的查询无法轻松完成此操作。

Answer 2

正如Pete所说，使用uniqe constaint列无法做到这一点，所以删除或禁用它而不是自己创建;在我的场景中，我这样处理：

 try {
            $dbObject = Connection::getConnection();
            $request = $dbObject->dbh->prepare($sqlForOrderNum);
            $request->execute();
            $currentorder = $request->fetchColumn();
            if ($currentorder >= $policyObject->getOrdernumber())
                $sql = "update policy set ORDERNUMBER = ORDERNUMBER +1 where ORDERNUMBER BETWEEN " . $policyObject->getOrdernumber() . " and $currentorder-1" . $sql;
            else
                $sql = "update policy set ORDERNUMBER = ORDERNUMBER -1 where ORDERNUMBER BETWEEN  $currentorder+1 and " . $policyObject->getOrdernumber() . $sql;
            $request = $dbObject->dbh->prepare($sql);
            $request->bindParam(':id', $policyid, PDO::PARAM_INT);
            $request->bindParam(':policyname', $policyObject->getPolicyName(), PDO::PARAM_STR);
            $request->bindParam(':remark', $policyObject->getRemark(), PDO::PARAM_STR);
            $request->bindParam(':access', $policyObject->getAccess(), PDO::PARAM_STR);
            $request->bindParam(':enablelog', $policyObject->getEnableLog(), PDO::PARAM_STR);

sql查询更新多列1

2 个答案: