mysqli_stmt_bind_result()函数将变量绑定到预处理语句以存储结果
定义和用法
mysqli_stmt_bind_result()函数用于将结果集的列绑定到变量。绑定变量后，您需要调用 mysqli_stmt_fetch() 函数以获取指定变量中的列的值。
语法
mysqli_stmt_bind_result($stmt, $var1, $var2...);
参数
| 序号 | 参数及说明 |
|---|---|
| 1 | stmt(必需) 这是表示准备好的语句的对象。 |
| 2 | var1(必需) 这表示要绑定到列的变量。 |
返回值
PHP mysqli_stmt_bind_result()函数返回一个布尔值，成功时为true，失败时为false。
PHP版本
此函数最初是在PHP版本5中引入的，并且可以在所有更高版本中使用。
在线示例
以下示例演示了mysqli_stmt_bind_result()函数的用法（面向过程风格）,将结果绑定到变量：
<?php
$con = mysqli_connect("localhost", "root", "password", "mydb");
mysqli_query($con, "CREATE TABLE myplayers(ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Place_Of_Birth VARCHAR(255), Country VARCHAR(255))");
print("创建表.....\n");
mysqli_query($con, "INSERT INTO myplayers values(1, 'Sikhar', 'Dhawan', 'Delhi', 'India')");
mysqli_query($con, "INSERT INTO myplayers values(2, 'Jonathan', 'Trott', 'CapeTown', 'SouthAfrica')");
mysqli_query($con, "INSERT INTO myplayers values(3, 'Kumara', 'Sangakkara', 'Matale', 'Srilanka')");
print("插入记录.....\n");
//检索表的内容
$stmt = mysqli_prepare($con, "SELECT * FROM myplayers");
//执行语句
mysqli_stmt_execute($stmt);
//将结果中的值绑定到变量
mysqli_stmt_bind_result($stmt, $id, $fname, $lname, $pob, $country);
while (mysqli_stmt_fetch($stmt)) {
print("Id: ".$id."\n");
print("fname: ".$fname."\n");
print("lname: ".$lname."\n");
print("pob: ".$pob."\n");
print("country: ".$country."\n");
print("\n");
}
//结束语句
mysqli_stmt_close($stmt);
//关闭连接
mysqli_close($con);
?>输出结果
创建表..... 插入记录..... Id: 1 fname: Sikhar lname: Dhawan pob: Delhi country: India Id: 2 fname: Jonathan lname: Trott pob: CapeTown country: SouthAfrica Id: 3 fname: Kumara lname: Sangakkara pob: Matale country: Srilanka
在线示例
在面向对象风格中，此函数的语法为$stmt-> bind_result();。以下是面向对象风格中此函数的示例，将变量绑定到结果集：
<?php
//建立连接
$con = new mysqli("localhost", "root", "password", "mydb");
$con -> query("CREATE TABLE Test(Name VARCHAR(255), AGE INT)");
$con -> query("insert into Test values('Raju', 25),('Rahman', 30),('Sarmista', 27)");
print("创建表.....\n");
$stmt = $con -> prepare( "SELECT * FROM Test WHERE Name in(?, ?)");
$stmt -> bind_param("ss", $name1, $name2);
$name1 = 'Raju';
$name2 = 'Rahman';
print("Records Deleted.....\n");
//执行语句
$stmt->execute();
//将变量绑定到结果集
$stmt->bind_result($name, $age);
while ($stmt->fetch()) {
print("Name: ".$name."\n");
print("Age: ".$age."\n");
}
//结束语句
$stmt->close();
//关闭连接
$con->close();
?>输出结果
创建表..... Records Deleted..... Name: Raju Age: 25 Name: Rahman Age: 30
在线示例
以下示例使用 mysqli_stmt_bind_result() 和 mysqli_stmt_fetch() 函数获取DESCRIBE查询的结果，并将结果中的值绑定到变量：
<?php
$con = mysqli_connect("localhost", "root", "password", "mydb");
mysqli_query($con, "CREATE TABLE myplayers(ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Place_Of_Birth VARCHAR(255), Country VARCHAR(255))");
print("创建表.....\n");
//Description of the table
$stmt = mysqli_prepare($con, "DESC myplayers");
//执行语句
mysqli_stmt_execute($stmt);
//将结果中的值绑定到变量
mysqli_stmt_bind_result($stmt, $field, $type, $null, $key, $default, $extra);
while (mysqli_stmt_fetch($stmt)) {
print("Field: ".$field."\n");
print("Type: ".$type."\n");
print("Null: ".$null."\n");
print("Key: ".$key."\n");
print("Default: ".$default."\n");
print("Extra: ".$extra."\n");
print("\n");
}
//结束语句
mysqli_stmt_close($stmt);
//关闭连接
mysqli_close($con);
?>输出结果
创建表..... Field: ID Type: int(11) Null: YES Key: Default: Extra: Field: First_Name Type: varchar(255) Null: YES Key: Default: Extra: Field: Last_Name Type: varchar(255) Null: YES Key: Default: Extra: Field: Place_Of_Birth Type: varchar(255) Null: YES Key: Default: Extra: Field: Country Type: varchar(255) Null: YES Key: Default: Extra:
在线示例
以下示例使用 mysqli_stmt_bind_result() 和 mysqli_stmt_fetch() 函数获取SHOW TABLES查询的结果，列出数据库中所有的数据表:
<?php
$con = mysqli_connect("localhost", "root", "password");
//Selecting the database
mysqli_query($con, "CREATE DATABASE NewDatabase");
mysqli_select_db($con, "NewDatabase");
//Creating tables
mysqli_query($con, "CREATE TABLE test1(Name VARCHAR(255), Age INT)");
mysqli_query($con, "CREATE TABLE test2(Name VARCHAR(255), Age INT)");
mysqli_query($con, "CREATE TABLE test3(Name VARCHAR(255), Age INT)");
print("Tables Created.....\n");
//表的说明
$stmt = mysqli_prepare($con, "SHOW TABLES");
//执行语句
mysqli_stmt_execute($stmt);
//将结果中的值绑定到变量
mysqli_stmt_bind_result($stmt, $table_name);
print("当前数据库中所有的表如下: \n");
while (mysqli_stmt_fetch($stmt)) {
print($table_name."\n");
}
//结束语句
mysqli_stmt_close($stmt);
//关闭连接
mysqli_close($con);
?>输出结果
Tables Created..... 当前数据库中所有的表如下: test1 test2 test3