PHP mysqli use_result() 函数
示例 - 面向对象的样式
从上次执行的查询中检索结果集：
<?php
$mysqli = new mysqli("localhost","my_user","my_password","my_db");
if ($mysqli -> connect_errno) {
echo "Failed to connect to MySQL: " . $mysqli -> connect_error;
exit();
}
$sql = "SELECT Lastname FROM Persons ORDER BY LastName;";
$sql .= "SELECT Country FROM Customers";
// Execute multi query
if ($mysqli -> multi_query($sql)) {
do {
// Store first result set
if ($result = $mysqli -> use_result()) {
while ($row = $result -> fetch_row()) {
printf("%s\n", $row[0]);
}
$result -> close();
}
// if there are more result-sets, the print a divider
if ($mysqli -> more_results()) {
printf("-------------\n");
}
//Prepare next result set
} while ($mysqli -> next_result());
}
$mysqli -> close();
?>
$mysqli = new mysqli("localhost","my_user","my_password","my_db");
if ($mysqli -> connect_errno) {
echo "Failed to connect to MySQL: " . $mysqli -> connect_error;
exit();
}
$sql = "SELECT Lastname FROM Persons ORDER BY LastName;";
$sql .= "SELECT Country FROM Customers";
// Execute multi query
if ($mysqli -> multi_query($sql)) {
do {
// Store first result set
if ($result = $mysqli -> use_result()) {
while ($row = $result -> fetch_row()) {
printf("%s\n", $row[0]);
}
$result -> close();
}
// if there are more result-sets, the print a divider
if ($mysqli -> more_results()) {
printf("-------------\n");
}
//Prepare next result set
} while ($mysqli -> next_result());
}
$mysqli -> close();
?>
查看底部的程序样式示例。
定义和用法
use_result() / mysqli_use_result() 函数启动从上次执行的查询中检索结果集。
语法
面向对象的风格：
$mysqli -> use_result()
程序风格：
mysqli_use_result(connection)
参数值
| 参数 | 描述 |
|---|---|
| connection | 必需。规定要使用的 MySQL 连接。 |
技术细节
| 返回值: | 返回一个无缓冲的结果对象。 错误时为 FALSE |
|---|---|
| PHP 版本: | 5+ |
示例 - 程序样式
从上次执行的查询中检索结果集：
<?php
$con = mysqli_connect("localhost","my_user","my_password","my_db");
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
exit();
}
$sql = "SELECT Lastname FROM Persons ORDER BY LastName;";
$sql .= "SELECT Country FROM Customers";
// Execute multi query
if (mysqli_multi_query($con, $sql)) {
do {
// Store first result set
if ($result = mysqli_use_result($con)) {
while ($row = mysqli_fetch_row($result)) {
printf("%s\n", $row[0]);
}
mysqli_free_result($result);
}
// if there are more result-sets, the print a divider
if (mysqli_more_results($con)) {
printf("-------------\n");
}
//Prepare next result set
} while (mysqli_next_result($con));
}
mysqli_close($con);
?>
$con = mysqli_connect("localhost","my_user","my_password","my_db");
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
exit();
}
$sql = "SELECT Lastname FROM Persons ORDER BY LastName;";
$sql .= "SELECT Country FROM Customers";
// Execute multi query
if (mysqli_multi_query($con, $sql)) {
do {
// Store first result set
if ($result = mysqli_use_result($con)) {
while ($row = mysqli_fetch_row($result)) {
printf("%s\n", $row[0]);
}
mysqli_free_result($result);
}
// if there are more result-sets, the print a divider
if (mysqli_more_results($con)) {
printf("-------------\n");
}
//Prepare next result set
} while (mysqli_next_result($con));
}
mysqli_close($con);
?>
