mysqli_commit()函数提交一个事务
MySQL数据库具有一项称为自动提交事务（如果您将其打开），则数据库中所做的更改将自动保存；如果将其关闭，则需要显式保存更改。
mysqli_commit()函数保存当前的事务。
mysqli_commit($con, [$flags, $name]);
| 序号 | 参数及说明 |
|---|---|
| 1 | con(必需) 这是一个表示与MySQL Server的连接的对象。 |
| 2 | flags(可选) 可以是下列常量之一：
|
| 3 | name(可选) 这是一个名称值，当给定时，将以COMMIT /* name */的形式执行。 |
mysqli_commit()函数返回一个布尔值，如果提交操作成功，则为true，否则为false。
此函数最初是在PHP版本5中引入的，并且在所有更高版本中均可用。
假设我们在数据库mydb中创建了一个名为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()函数的用法（面向过程风格）-
<?php
//建立连接
$con = mysqli_connect("localhost", "root", "password", "mydb");
//将自动提交设置为false
mysqli_autocommit($con, False);
//将记录插入到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')");
//验证表的内容
$result = mysqli_query($con, "SELECT * FROM my_team");
print_r($result);
mysqli_commit($con);
//关闭连接
mysqli_close($con);
?>输出结果
mysqli_result Object ( [current_field] => 0 [field_count] => 5 [lengths] => [num_rows] => 4 [type] => 0 )
如果您验证表my_team的内容，则可以观察保存的数据，如下所示-
mysql> select * from my_team; +----+------------+------------+----------------+-------------+ | ID | First_Name | Last_Name | Place_Of_Birth | Country | +----+------------+------------+----------------+-------------+ | 1 | Shikhar | Dhawan | Delhi | India | | 2 | Jonathan | Trott | CapeTown | SouthAfrica | | 3 | Kumara | Sangakkara | Matale | Srilanka | | 4 | Virat | Kohli | Delhi | India | +----+------------+------------+----------------+-------------+ 4 rows in set (0.00 sec)
面向对象样式的方法，语法为$con->commit()。以下是面向对象风格中此函数的示例；
//建立连接
$con = new mysqli("localhost", "root", "password", "mydb");
//将自动提交设置为true
$con->autocommit(FALSE);
//将记录插入到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')");
//验证表的内容
$result = $con->query( "SELECT * FROM my_team");
print_r($result);
//保存结果
$con->commit();
//关闭连接
$con -> close();
?>输出结果
mysqli_result Object ( [current_field] => 0 [field_count] => 5 [lengths] => [num_rows] => 4 [type] => 0 )
让我们再看另一个实例。 在这里，我们创建了一个表，关闭了自动提交选项，插入了一条记录并保存了更改。 保存之后，我们插入了另一条记录：
//建立连接
$con = mysqli_connect("localhost", "root", "password", "mydb");
mysqli_query($con, "Create table players (First_Name VARCHAR(255), Last_Name VARCHAR(255), Country VARCHAR(255))");
//将自动提交设置为false
mysqli_autocommit($con, False);
//将记录插入到my_team表中
mysqli_query($con, "insert into players values('Shikhar', 'Dhawan', 'India')");
mysqli_commit($con);
mysqli_query($con, "insert into players values('Jonathan', 'Trott', 'SouthAfrica')");
//关闭连接
mysqli_close($con);
?>由于我们尚未保存上一个插入查询，因此在执行上述程序后，如果您验证 players 表的内容，则只能看到一条记录，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 "连接MySQL失败: " . 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);
?>执行以上程序后，如果验证表test的内容，则可以看到插入的记录为-
mysql> select * from test; +---------+------+ | Name | Age | +---------+------+ | Sharukh | 25 | | Kalyan | 30 | +---------+------+ 2 rows in set (0.00 sec)