PDO rowCount無法返回受影響的行的正確數量

Question

我遇到了PDO準備好的語句和rowCount返回錯誤的受影響行數的問題。

我有一個簡單的測試數據庫：

create table test (
    boolean var1; 
); 

然後，我有以下的測試代碼：

$sth = $pdo->prepare("INSERT into test (var1) VALUES (:val)"); 
$sth->execute(array(':val' => true)); 
echo $sth->rowCount(); 

預期將返回：1行受到影響

當我插入插入失敗：

$sth = $pdo->prepare("INSERT into test (var1) VALUES (:val)"); 
$sth->execute(array(':val' => 20)); 
echo $sth->rowCount(); 

它返回預期：0行受到影響

然而，當我有多個插入 - 在

$sth = $pdo->prepare("INSERT into test (var1) VALUES (:val)"); 

$sth->execute(array(':val' => true)); 
echo $sth->rowCount() . ", "; 

$sth->execute(array(':val' => 20)); 
echo $sth->rowCount(); 

結果：1，1

如果我翻轉執行順序，我得到：0,1

爲什麼rowCount（） - 受影響的行在失敗語句後未成功設置爲零ss聲明？

我運行PHP 5.3.6-13和PostgreSQL 9.1

Answer 1

在我看來，那$sth->execute(array(':val' => true))成功完成，從而增加了rowCount，但$sth->execute(array(':val' => 20))沒有。這裏是rowCount爲$sth每個階段的狀態：

$sth = $pdo->prepare("INSERT into test (var1) VALUES (:val)"); 

# No successful DML queries have been done with the $sth yet. 
# rowCount == 0 

$sth->execute(array(':val' => true)); 
echo $sth->rowCount() . ", "; 

# rowCount increases because of a successful INSERT statement 
# rowCount == 1 

$sth->execute(array(':val' => 20)); 
echo $sth->rowCount(); 

# rowCount does not increase due to failed INSERT statement 
# rowCount == 1 

現在，讓我們來看看，在相反的順序：

$sth = $pdo->prepare("INSERT into test (var1) VALUES (:val)"); 

# No successful DML queries have been done with the $sth yet. 
# rowCount == 0 

$sth->execute(array(':val' => 20)); 
echo $sth->rowCount(); 

# rowCount does not increase due to failed INSERT statement 
# rowCount == 0 

$sth->execute(array(':val' => true)); 
echo $sth->rowCount() . ", "; 

# rowCount increases because of a successful INSERT statement 
# rowCount == 1