mysqli_use_result()函數(shù)從上次使用 mysqli_real_query() 執(zhí)行的查詢中初始化結(jié)果集的檢索。
mysqli_use_result()函數(shù)開始從先前執(zhí)行的查詢中檢索結(jié)果集
mysqli_use_result($con)
| 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。 |
mysqli_use_result()函數(shù)在出現(xiàn)錯誤的情況下返回結(jié)果對象和布爾值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_use_result()函數(shù)的用法（面向過程風(fēng)格）-
<?php
//建立連接
$con = mysqli_connect("localhost", "root", "password", "test");
//執(zhí)行多個查詢，多個查詢是分號隔開
$query = "SELECT * FROM players;SELECT * FROM emp;SELECT * FROM tutorials";
$res = mysqli_multi_query($con, $query);
$count = 0;
if ($res) {
do {
$count = $count+1;
mysqli_use_result($con);
} while (mysqli_next_result($con));
}
print("結(jié)果集數(shù): ".$count);
mysqli_close($con);
?>輸出結(jié)果
結(jié)果集數(shù): 3
在面向?qū)ο箫L(fēng)格中，此函數(shù)的語法為$con->use_result();。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", "test");
//多個查詢
$res = $con->multi_query("SELECT * FROM players;SELECT * FROM emp;SELECT * FROM tutorials");
$count = 0;
if ($res) {
do {
$count = $count+1;
$con-> use_result();
} while ($con->next_result());
}
print("結(jié)果集數(shù): ".$count);
//關(guān)閉連接
$res = $con -> close();
?>輸出結(jié)果
結(jié)果集數(shù): 3
以下示例檢索多個查詢的所有結(jié)果集的記錄-
//建立連接
$con = mysqli_connect("localhost", "root", "password", "test");
//執(zhí)行多個查詢
$query = "SELECT * FROM players;SELECT * FROM emp";
$res = mysqli_multi_query($con, $query);
if ($res) {
do {
if ($result = mysqli_use_result($con)) {
while ($row = mysqli_fetch_row($result)) {
print("Name: ".$row[0]."\n");
print("Age: ".$row[1]."\n");
}
mysqli_free_result($result);
}
if (mysqli_more_results($con)) {
print("\n");
}
} while (mysqli_use_result($con));
}
mysqli_close($con);輸出結(jié)果
Name: Dhavan Age: 33 Name: Rohit Age: 28 Name: Kohli Age: 25 Name: Raju Age: 25 Name: Rahman Age: 30 Name: Ramani Age: 22