[英]how to return comma separated values that DOESN'T exists in mysql table?
我试图使标签表接受来自用户的新标签。
我想排除一般单词插入“ the”或“ that”之类的标签表中
我的想法是制作一个通用的单词表,并在插入新标签时排除它们。
这就是我在php上的工作方式:
//get the general words from database and convert them into ary_general
//execlude the general words from the new words and store the rest into ary_tags
//insert the ary_tags words into tags table if doesn't exist.
但我希望在一份声明中能做到:
例:
来源:“您认为编程很酷吗?”
tbl_general_words
do
you
that
is
结果:“思考,编程,酷”
一种声明方法可以工作
<?php
//needs to be configured appropriately
$conn = new PDO($dsn, $user, $password);
// fetch associative arrays, I normally use objects myself though
$conn->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
// split the string in question into words
$wordsToTag = explode(" ", $phraseToTag);
// create a holder for the common words
$commonWords = array();
// prepare and execute the statement
$stmt = $conn->prepare("SELECT word FROM tbl_general_words");
$stmt->execute();
// add the words to the array
while($row = $stmt->fetch())
{
$commonWords[] = $row['word'];
}
// get the words that are not common
$wordsToTag = array_diff($commonWords, $wordsToTag);
// build your SQL string
$sql = "INSERT INTO tags (tag) VALUES ";
// fore each word, we'll need a ? to hold the paramater
foreach($wordsToTag as $wordToTag)
{
$sql .= "(?), ";
}
// remove the trailing space and trailing comma
// this could be achieved with an array and join instead if you prefer
$sql = rtrim(trim($sql), ",");
// add the words
$stmt = $conn->prepare($sql);
$stmt->execute($wordsToTag);
?>
但是,我建议将其作为迭代方法进行,因为它更干净。
<?php
// the code is the same until the adding part
$conn = new PDO($dsn, $user, $password);
$conn->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
$wordsToTag = explode(" ", $phraseToTag);
$commonWords = array();
$stmt = $conn->prepare("SELECT word FROM tbl_general_words");
$stmt->execute();
while($row = $stmt->fetch())
{
$commonWords[] = $row['word'];
}
$wordsToTag = array_diff($commonWords, $wordsToTag);
// prepare the statement
$stmt = $conn->prepare("INSERT INTO tags SET tag = ?");
foreach($wordsToTag as $wordToTag)
{
// change the param and execute, because prepared statements are designed for this
$stmt->bindParam(1, $wordToTag);
$stmt->execute();
}
?>
CREATE TEMPORARY TABLE temporary_tags (word VARCHAR(100) NOT NULL); INSERT INTO temporary_tags VALUES ('do'),('you'),('think'),('that'),('programming'),('is'),('cool'); -- mysql_query("INSERT INTO temporary_tags VALUES ('", implode("'),('", $arr_tags), "');") INSERT INTO tags (tagColumn, someIntColumn, someStrColumn) SELECT temporary_tags.word, 5, 'string value' FROM temporary_tags LEFT JOIN tbl_general_words ON tbl_general_words.word = temporary_tags.word WHERE tbl_general_words.word IS NULL; DROP TEMPORARY TABLE temporary_tags;
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