小编Lin*_*nCR的帖子

我有一个带ID的表,这个ID是自动增量和主键,我第一次插入到该表时,ID从0开始,但在我从该表中删除所有值并再次插入它之后,ID不会从0开始,但是从ID的最后一个值开始,出了什么问题？我可以将值重置为0吗？

我想用java将结果写到文件的末尾

FileWriter fStream;
        try {
            fStream = new FileWriter("recallPresision.txt", true);
            fStream.append("queryID=" + queryID + "         " + "recall=" + recall + "           Pres=" + presision);
            fStream.append("\n");
            fStream.flush();
            fStream.close();
        } catch (IOException ex) {
            Logger.getLogger(query.class.getName()).log(Level.SEVERE, null, ex);
        }

我"\n"在声明中写道,它写入文件但不是新行

我想用新行打印结果

我有一个关于MySQL的表与主键,我插入到该表,我想恢复已插入的最后一行的ID,我知道我必须使用LAST_INSERT_ID 但我的问题是在使用该语句后将值插入另一个表没有主键,我可以再次使用它来获取第一个插入的确切ID吗？

$ php pdo#

include_once 'type_model.php';
        $t = new Type_Model();
        $typeID = $t->getTypeID($type);
        include_once 'informationObject_model.php';
        $i = new InformationObject_Model();
        $answerIoID = $i->getIOID($ioAnswer);
        $query = "INSERT INTO question (info, text, answer, answerIoID, firstChoice, secondChoice, thirdChoice, 
            firstHint, secondHint, typeID) VALUES (:info, :text, :answer, :answerIoID,
            :firstChoice, :secondChoice, :thirdChoice, :firstHint, :secondHint, :typeID)";
        $sth = $this->db->prepare($query);
        $sth->execute(array(
            ':info' => $info,
            ':text' => $text,
            ':answer' => $answer,
            ':answerIoID' => $answerIoID,
            ':firstChoice' => $choices[0],
            ':secondChoice' => $choices[1],
            ':thirdChoice' => $choices[2],
            ':firstHint' => $hints[0],
            ':secondHint' => …