PHP We often need to connect to the database. In the past, the connection method of mysqli was generally used for database operations, but with the The advantages of PDO are gradually emerging, and the connection method of PDO has become mainstream. This article will take you to see how to use query after using PDO to connect to the database. ()Read the data.
First let’s take a look at the use of query():
query ( string $statement )
query ( string $statement , int $PDO::FETCH_COLUMN , int $colno )
query ( string $statement , int $PDO::FETCH_CLASS , string $classname , array $ctorargs )
query ( string $statement , int $PDO::FETCH_INTO , object $object )
$statement: SQL statement that needs to be prepared and executed.
<?php
$type="mysql";
$servername="localhost";
$dbname="my_database";
$dsn="$type:host=$servername;dbname=$dbname";
$username="root";
$password="root123456";
$pdo=new PDO($dsn,$username,$password);
//错误模式，用于抛出异常
$pdo->setAttribute(PDO::ATTR_CASE, PDO::CASE_UPPER);
$sql="select * from fate";
$statement =$pdo->query($sql);
foreach($statement as $row){
echo $row['ID']," ";
echo $row['NAME']," ";
echo $row['AGE']," ";
echo "<br>";
}输出：1 saber 100
2 acher 77
3 luncher 56
4 cooker 18
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