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PDO bindParam 和 bindValue 差別在哪裡?

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2020-08-13 Mark Chang

首先 bindParam 是綁定變數、bindValue  是綁定值。
以下範例：
bindParam

＜?php

try {

$dbh = new PDO("mysql:host=localhost;dbname=test", "root", "");

$dbh-＞setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$stmt = $dbh-＞prepare("SELECT * FROM tablename WHERE number = ?");

$stmt-＞bindParam(1, $test_value, PDO::PARAM_INT);

$test_value = 888;

$stmt-＞execute();

print_r($stmt-＞fetchAll());

} catch(PDOException $e) {

echo $e-＞getMessage();

}

?＞ 

執行正常。

bindValue

＜?php

try {

$dbh = new PDO("mysql:host=localhost;dbname=test", "root", "");

$dbh-＞setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$stmt = $dbh-＞prepare("SELECT * FROM tablename WHERE number = ?");

$stmt-＞bindValue(1, $test_value, PDO::PARAM_INT);

$test_value = 888;

$stmt-＞execute();

print_r($stmt-＞fetchAll());

} catch(PDOException $e) {

echo $e-＞getMessage();

}

?＞ 

輸出：Notice: Undefined variable: test_value

以上紀錄。
 

https://innstory.com/story-PDO_bindParam_和_bindValue_差別在哪裡-2375

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Mark Chang

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