mysqli_commit()函數(shù)提交一個事務(wù)
MySQL數(shù)據(jù)庫具有一項稱為自動提交事務(wù)（如果您將其打開），則數(shù)據(jù)庫中所做的更改將自動保存；如果將其關(guān)閉，則需要顯式保存更改。
mysqli_commit()函數(shù)保存當(dāng)前的事務(wù)。
mysqli_commit($con, [$flags, $name]);
| 序號 | 參數(shù)及說明 |
|---|---|
| 1 | con(必需) 這是一個表示與MySQL Server的連接的對象。 |
| 2 | flags(可選) 可以是下列常量之一：
|
| 3 | name(可選) 這是一個名稱值，當(dāng)給定時，將以COMMIT /* name */的形式執(zhí)行。 |
mysqli_commit()函數(shù)返回一個布爾值，如果提交操作成功，則為true，否則為false。
此函數(shù)最初是在PHP版本5中引入的，并且在所有更高版本中均可用。
假設(shè)我們在數(shù)據(jù)庫mydb中創(chuàng)建了一個名為my_team的表，如下所示-
CREATE TABLE my_team( ID INT PRIMARY KEY AUTO_INCREMENT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Place_Of_Birth VARCHAR(255), Country VARCHAR(255) );
以下示例演示了mysqli_commit()函數(shù)的用法（面向過程風(fēng)格）-
<?php
//建立連接
$con = mysqli_connect("localhost", "root", "password", "mydb");
//將自動提交設(shè)置為false
mysqli_autocommit($con, False);
//將記錄插入到my_team表中
mysqli_query($con, "insert into my_team values(1, 'Shikhar', 'Dhawan', 'Delhi', 'India')");
mysqli_query($con, "insert into my_team values(2, 'Jonathan', 'Trott', 'CapeTown', 'SouthAfrica')");
mysqli_query($con, "insert into my_team values(3, 'Kumara', 'Sangakkara', 'Matale', 'Srilanka')");
mysqli_query($con, "insert into my_team values(4, 'Virat', 'Kohli', 'Delhi', 'India')");
//驗證表的內(nèi)容
$result = mysqli_query($con, "SELECT * FROM my_team");
print_r($result);
mysqli_commit($con);
//關(guān)閉連接
mysqli_close($con);
?>輸出結(jié)果
mysqli_result Object ( [current_field] => 0 [field_count] => 5 [lengths] => [num_rows] => 4 [type] => 0 )
如果您驗證表my_team的內(nèi)容，則可以觀察保存的數(shù)據(jù)，如下所示-
mysql> select * from my_team; +----+------------+------------+----------------+-------------+ | ID | First_Name | Last_Name | Place_Of_Birth | Country | +----+------------+------------+----------------+-------------+ | 1 | Shikhar | Dhawan | Delhi | India | | 2 | Jonathan | Trott | CapeTown | SouthAfrica | | 3 | Kumara | Sangakkara | Matale | Srilanka | | 4 | Virat | Kohli | Delhi | India | +----+------------+------------+----------------+-------------+ 4 rows in set (0.00 sec)
面向?qū)ο髽邮降姆椒?，語法為$con->commit()。以下是面向?qū)ο箫L(fēng)格中此函數(shù)的示例；
//建立連接
$con = new mysqli("localhost", "root", "password", "mydb");
//將自動提交設(shè)置為true
$con->autocommit(FALSE);
//將記錄插入到my_team表中
$con->query( "insert into my_team values(1, 'Shikhar', 'Dhawan', 'Delhi', 'India')");
$con->query( "insert into my_team values(2, 'Jonathan', 'Trott', 'CapeTown', 'SouthAfrica')");
$con->query( "insert into my_team values(3, 'Kumara', 'Sangakkara', 'Matale', 'Srilanka')");
$con->query( "insert into my_team values(4, 'Virat', 'Kohli', 'Delhi', 'India')");
//驗證表的內(nèi)容
$result = $con->query( "SELECT * FROM my_team");
print_r($result);
//保存結(jié)果
$con->commit();
//關(guān)閉連接
$con -> close();
?>輸出結(jié)果
mysqli_result Object ( [current_field] => 0 [field_count] => 5 [lengths] => [num_rows] => 4 [type] => 0 )
讓我們再看另一個實例。 在這里，我們創(chuàng)建了一個表，關(guān)閉了自動提交選項，插入了一條記錄并保存了更改。 保存之后，我們插入了另一條記錄：
//建立連接
$con = mysqli_connect("localhost", "root", "password", "mydb");
mysqli_query($con, "Create table players (First_Name VARCHAR(255), Last_Name VARCHAR(255), Country VARCHAR(255))");
//將自動提交設(shè)置為false
mysqli_autocommit($con, False);
//將記錄插入到my_team表中
mysqli_query($con, "insert into players values('Shikhar', 'Dhawan', 'India')");
mysqli_commit($con);
mysqli_query($con, "insert into players values('Jonathan', 'Trott', 'SouthAfrica')");
//關(guān)閉連接
mysqli_close($con);
?>由于我們尚未保存上一個插入查詢，因此在執(zhí)行上述程序后，如果您驗證 players 表的內(nèi)容，則只能看到一條記錄，如下所示-
mysql> select * from players; +------------+-----------+---------+ | First_Name | Last_Name | Country | +------------+-----------+---------+ | Shikhar | Dhawan | India | +------------+-----------+---------+ 1 row in set (0.00 sec)
<?php
$connection = mysqli_connect("localhost", "root", "password", "mydb");
if (mysqli_connect_errno($connection)){
echo "連接MySQL失敗: " . mysqli_connect_error();
}
mysqli_autocommit($connection,FALSE);
mysqli_query($connection, "create table test(Name VARCHAR(255), Age INT)");
mysqli_query($connection, "INSERT INTO test VALUES ('Sharukh', 25)");
mysqli_query($connection, "INSERT INTO test VALUES ('Kalyan', 30)");
mysqli_commit($connection);
mysqli_close($connection);
?>執(zhí)行以上程序后，如果驗證表test的內(nèi)容，則可以看到插入的記錄為-
mysql> select * from test; +---------+------+ | Name | Age | +---------+------+ | Sharukh | 25 | | Kalyan | 30 | +---------+------+ 2 rows in set (0.00 sec)