mysqli_refresh()函數(shù)刷新表或緩存，或者重置復(fù)制服務(wù)器信息。
mysqli_refresh()函數(shù)刷新表，刷新日志，刷新緩存。
mysqli_refresh($con, options);
| 序號(hào) | 參數(shù)及說(shuō)明 |
|---|---|
| 1 | con(必需) 這是一個(gè)表示與MySQL Server的連接的對(duì)象。 |
| 2 | options(必需) 這表示MYSQL刷新命令的選項(xiàng)，您可以通過(guò)用逗號(hào)分隔它們來(lái)指定多個(gè)選項(xiàng)。
|
PHP mysqli_refresh()函數(shù)返回一個(gè)布爾值，如果刷新操作成功，則為true，否則為false。
此函數(shù)最初是在PHP版本5中引入的，并且可以在所有更高版本中使用。
以下示例演示了mysqli_refresh()函數(shù)的用法（面向過(guò)程風(fēng)格）-
假設(shè)我們?cè)跀?shù)據(jù)庫(kù)mydb中創(chuàng)建了一個(gè)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) );
以下示例關(guān)閉自動(dòng)提交選項(xiàng)，并嘗試將記錄插入此表中-
<?php
//建立連接
$con = mysqli_connect("localhost", "root", "password", "mydb");
//將自動(dòng)提交設(shè)置為true
mysqli_autocommit($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')");
//關(guān)閉連接
mysqli_close($con);
?>因?yàn)槲覀冴P(guān)閉了自動(dòng)提交選項(xiàng)，所以添加的記錄不會(huì)保存在數(shù)據(jù)庫(kù)中，如果您在MySQL中驗(yàn)證表的內(nèi)容，它將是空的，如下所示：
mysql> select * from my_team; Empty set (0.00 sec)
您可以使用mysqli_query函數(shù)將記錄刷新到表中，如下所示：
<?php
//建立連接
$con = mysqli_connect("localhost", "root", "password", "mydb");
//將自動(dòng)提交設(shè)置為true
mysqli_autocommit($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')");
mysqli_refresh($con, MYSQLI_REFRESH_TABLES);
//關(guān)閉連接
mysqli_close($con);現(xiàn)在，如果您驗(yàn)證表my_team的內(nèi)容，則可以看到插入的記錄，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)
在面向?qū)ο箫L(fēng)格中，此函數(shù)的語(yǔ)法為$con->refresh();。以下是面向?qū)ο箫L(fēng)格中此函數(shù)的示例；
<?php
$con = new mysqli("localhost", "root", "password", "mydb");
//在players表中插入一個(gè)記錄
$con->query("CREATE TABLE IF NOT EXISTS players(First_Name VARCHAR(255), Last_Name VARCHAR(255), Country VARCHAR(255))");
//將自動(dòng)提交設(shè)置為false
$con->autocommit(FALSE);
$con->query("insert into players values('Shikhar', 'Dhawan', 'India')");
$con->query("insert into players values('Jonathan', 'Trott', 'SouthAfrica')");
//正在刷新表
$con->refresh(MYSQLI_REFRESH_TABLES);
//關(guān)閉連接
$res = $con -> close();
?>輸出結(jié)果
Data Created......
如果您觀察數(shù)據(jù)庫(kù)中表的內(nèi)容，則可以看到插入的記錄，如下所示：
mysql> select * from players; +------------+-----------+-------------+ | First_Name | Last_Name | Country | +------------+-----------+-------------+ | Shikhar | Dhawan | India | | Jonathan | Trott | SouthAfrica | +------------+-----------+-------------+ 2 rows in set (0.00 sec)
mysqli_refresh使用示例
<?php
$connection_mysql = mysqli_connect("localhost","username","password","db");
if (mysqli_connect_errno($connection_mysql)){
echo "連接MySQL失敗: " . mysqli_connect_error();
}
mysqli_refresh($connection_mysql,MYSQLI_REFRESH_LOG);
mysqli_close($connection_mysql);
?>