<?php
try {
   $dbconnect = new PDO('mysql:host=localhost;dbname=pdodatabase','root','753951');
} catch (PDOException $exception) {
   echo "Connection error message: " . $exception->getMessage();
}
$sqlquery = "SELECT * FROM user";
$result = $dbconnect->query($sqlquery);
$rownum = $result->rowCount();
echo "There are total ".$rownum." users:<br />";

while ($row = $result->fetch(PDO::FETCH_ASSOC)){
   $name = $row['name'];
   $gender = $row['gender'];
   $age = $row['age'];
   echo "user $name , is $gender ,and is $age years old. <br />";
}
?>

<?php
try {
   $dbconnect = new PDO('mysql:host=localhost;dbname=pdodatabase','root','753951');
} catch (PDOException $exception) {
   echo "Connection error message: " . $exception->getMessage();
}
$sqlquery = "SELECT * FROM user";
$result = $dbconnect->query($sqlquery);
$rownum = $result->rowCount();
echo "There are total ".$rownum." users:<br />";

$rowall = $result->fetchAll();
foreach ($rowall as $row){
   $id = $row[0];
   $name = $row[1];
   $gender = $row[3];
   $age = $row[2];
   $info = $row['info'];
   echo "ID: $id . User $name , is $gender ,and is $age years old. and info: $info<br />";
}
?>

<?php
try {
   $dbconnect = new PDO('mysql:host=localhost;dbname=pdodatabase','root','753951');
} catch (PDOException $exception) {
   echo "Connection error message: " . $exception->getMessage();
}
$sqlquery = "SELECT * FROM user";
$result = $dbconnect->query($sqlquery);
foreach ($result as $row){
   $name = $row['name'];
   $gender = $row['gender'];
   $age = $row['age'];
   echo "user $name , is $gender ,and is $age years old. <br />";
}
?>

<?php
try {
   $dbconnect = new PDO('mysql:host=localhost;dbname=pdodatabase','root','753951');
} catch (PDOException $exception) {
   echo "Connection error message: " . $exception->getMessage();
}
$sqlquery = "INSERT INTO user (id,name,age,gender,info )VALUES (NULL,'zhangdaguang', '39', 'male', 'he is a middle-age male.')";
if($dbconnect->exec($sqlquery)){
  echo "A new record has been inserted.<br />";
}
$sqlquery2 = "UPDATE user SET age='45' WHERE name='zhangdaguang'";
if($dbconnect->exec($sqlquery2)){
  echo "The record has been updated.";
}
?>

<?php
try {
   $dbconnect = new PDO('mysql:host=localhost;dbname=pdodatabase','root','753951');
} catch (PDOException $exception) {
   echo "Connection error message: " . $exception->getMessage();
}
$sqlquery = "DELETE FROM user WHERE name = 'zhangdaguang'";
if($dbconnect->exec($sqlquery)){
  echo "A new record has been deleted.";
}
?>