PHP mysqli_commit()用法及代碼示例

定義和用法

MySQL 數據庫有一個名為 auto-commit 的函數，如果打開它，數據庫中所做的更改會自動保存，如果關閉，則需要顯式保存更改。

這個mysqli_commit()函數保存當前交易。

用法

mysqli_commit($con, [$flags, $name]);

參數

Sr.No	參數及說明
1	con(Mandatory) 這是一個表示與 MySQL 服務器的連接的對象。
2	flags(Optional) 一個常數，可以是以下之一： MYSQLI_TRANS_COR_AND_CHAIN MYSQLI_TRANS_COR_AND_NO_CHAIN MYSQLI_TRANS_COR_RELEASE MYSQLI_TRANS_COR_NO_RELEASE
3	name(Optional) 這是一個名稱值，當給出時，作為 COMMIT/*name*/執行。

返回值

PHP mysqli_commit() 函數返回一個布爾值，如果提交操作成功，則為真，否則為假。

PHP版本

這個函數最初是在 PHP 版本 5 中引入的，並且適用於所有後續版本。

示例

假設我們在數據庫 mydb 中創建了一個名為 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() 函數的用法(程序風格) -

<?php
   //Creating a connection
   $con = mysqli_connect("localhost", "root", "password", "mydb");

   //Setting auto commit to false
   mysqli_autocommit($con, False);

   //Inserting a records into the my_team table
   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')");

   //Verifying the contents of the table
   $result = mysqli_query($con, "SELECT * FROM my_team");
   print_r($result);

   mysqli_commit($con);

   //Closing the connection
   mysqli_close($con);
?>

這將產生以下結果 -

mysqli_result Object
(
    [current_field] => 0
    [field_count] => 5
    [lengths] =>
    [num_rows] => 4
    [type] => 0
)

如果您然後驗證表 my_team 的內容，您可以觀察保存的數據，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)

示例

這種麵向對象風格的方法的語法是 $con->commit()。以下是麵向對象模式 $minus 中此函數的示例；

//Creating a connection
$con = new mysqli("localhost", "root", "password", "mydb");

//Setting auto commit to true
$con->autocommit(FALSE);

//Inserting a records into the my_team table
$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')");

//Verifying the contents of the table
$result = $con->query( "SELECT * FROM my_team");
print_r($result);

//Saving the results
$con->commit();

//Closing the connection
$con -> close();
?>

這將產生以下結果 -

mysqli_result Object
(
    [current_field] => 0
    [field_count] => 5
    [lengths] =>
    [num_rows] => 4
    [type] => 0
)

示例

讓我們考慮另一個例子。在這裏，我們創建了一個表，關閉了 auto-commit 選項並插入了一條記錄並保存了更改。保存後，我們插入了另一條記錄 -

//Creating a connection
$con = mysqli_connect("localhost", "root", "password", "mydb");

mysqli_query($con, "Create table players (First_Name VARCHAR(255), Last_Name VARCHAR(255), Country VARCHAR(255))");
//Setting auto commit to false
mysqli_autocommit($con, False);

//Inserting a records into the my_team table
mysqli_query($con, "insert into players values('Shikhar', 'Dhawan', 'India')");

mysqli_commit($con);

mysqli_query($con, "insert into players values('Jonathan', 'Trott', 'SouthAfrica')");

//Closing the connection
mysqli_close($con);
?>

由於我們還沒有保存最後一個插入查詢，執行上述程序後，如果您驗證玩家表的內容，您隻能看到一條記錄，如下所示 -

mysql> select * from players;
+------------+-----------+---------+
| First_Name | Last_Name | Country |
+------------+-----------+---------+
| Shikhar    | Dhawan    | India   |
+------------+-----------+---------+
1 row in set (0.00 sec)

示例

<?php
   $connection = mysqli_connect("localhost", "root", "password", "mydb");
   
   if (mysqli_connect_errno($connection)){
      echo "Failed to connect to MySQL:" . 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);
?>

執行上述程序後，如果您驗證表測試的內容，您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)