PDO可以通過設置ATTR_ERRODE屬性來控制sql執行出錯時的行爲表現,具體可以設置以下三個值:
PDO::ERRMODE_SILENT 靜默模式,不會報錯,只會設置PDO的 errorCode
PDO::ERRMODE_WARNING 會報warning錯誤
PDO::ERRMODE_EXCEPTION 拋出異常
下面來看代碼演示:
1、靜默模式
<?php
try {
$pdo = new PDO('mysql:dbname=test;host=127.0.0.1', 'root', 'root', [
PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8',
]);
} catch (PDOException $e) {
exit('連接數據庫失敗:' . $e->getMessage());
}
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_SILENT);
$sql = "SELECT id FROM not_a_table LIMIT 1";
$rs = $pdo->query($sql);
var_dump($pdo->errorCode());
print_r($pdo->errorInfo());
執行結果:
string(5) "42S02"
Array
(
[0] => 42S02
[1] => 1146
[2] => Table 'test.not_a_table' doesn't exist
)
------------------------------------------------------------------------------------------------------------------------------------------------------------------
2、warning模式
<?php
try {
$pdo = new PDO('mysql:dbname=test;host=127.0.0.1', 'root', 'root', [
PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8',
]);
} catch (PDOException $e) {
exit('連接數據庫失敗:' . $e->getMessage());
}
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);
ini_set('display_errors', 'On');
$sql = "SELECT id FROM not_a_table LIMIT 1";
$rs = $pdo->query($sql);
var_dump($pdo->errorCode());
print_r($pdo->errorInfo());
執行結果:
Warning: PDO::query(): SQLSTATE[42S02]: Base table or view not found: 1146 Table 'test.not_a_table' doesn't exist in E:\project\slim\web\pdo.php on line 16
string(5) "42S02" Array ( [0] => 42S02 [1] => 1146 [2] => Table 'test.not_a_table' doesn't exist )
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
3、拋出異常:
<?php
try {
$pdo = new PDO('mysql:dbname=test;host=127.0.0.1', 'root', 'root', [
PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8',
]);
} catch (PDOException $e) {
exit('連接數據庫失敗:' . $e->getMessage());
}
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "SELECT id FROM not_a_table LIMIT 1";
try {
$rs = $pdo->query($sql);
} catch (PDOException $e) {
echo 'sql執行出錯:' . $e->getCode() . '###' . $e->getMessage() . "\n";
}
var_dump($pdo->errorCode());
print_r($pdo->errorInfo());
執行結果:
sql執行出錯:42S02###SQLSTATE[42S02]: Base table or view not found: 1146 Table 'test.not_a_table' doesn't exist
string(5) "42S02"
Array
(
[0] => 42S02
[1] => 1146
[2] => Table 'test.not_a_table' doesn't exist
)
由於PDO拋出的是PDOException,所以我們的代碼中儘量不要自己手動拋出PDOException,以免混淆。