1. DQL operation of MySQL using mysqli extension library in PHP
Copy CodeThe code is as follows:
Header ("Content-type:text/html;charset=utf-8");
mysqli working with MySQL database (object oriented approach)
1. Create a Mysqli object
$mysqli =new mysqli ("localhost", "root", "root", "test");
if ($mysqli->connect_error) {
Die ("Connection failed". $mysqli->connect_error);
}
2. Operation database (send SQL)
$sql = "Select *from user1";
3. Processing results
$res = $mysqli->query ($sql);
Var_dump ($res);
FETCH_ASSOC \fetch_array \fetch_object
while ($row = $res->fetch_row ()) {
Var_dump ($row);
/* foreach ($row as $val) {
Echo '--'. $val;
}
Echo '
';*/
}
4. Close Resources
$res->free ();
$mysqli->close ();
?>
The following is a process-oriented
Copy CodeThe code is as follows:
Header ("Content-type:text/html;charset=utf-8");
$mysqli =mysqli_connect ("localhost", "root", "root", "test");
if (! $mysqli) {
Die ("Connection Failed". Mysqli_connect_error ());
}
$sql = "Select *from user1";
$res =mysqli_query ($mysqli, $sql);
Var_dump ($res);
while ($row =mysqli_fetch_row ($res)) {
foreach ($row as $val) {
Echo '-'. $val;
}
Echo '
';
}
Freeing memory
Mysqli_free_result ($res);
Mysqli_close ($MYSQLI);
?>
2. Use mysqli extension library to MySQL DML operation in PHP
Copy CodeThe code is as follows:
Using MYSQLI to extend the library's crud operations to MySQL
Header ("Content-type:text/html;charset=utf-8");
$mysqli = new Mysqli ("localhost", "root", "root", "test");
if ($mysqli->connect_error) {
Die ("Connection failed". $mysql->connect_error);
}
Add a record
$sql = "INSERT INTO User1 (name,password,email,age) VALUES (' Lucy ', MD5 (' Lucy '), ' lucy@163.com ', 17)";
Delete a record
$sql = "Delete from User1 where id = 80";
Update a record
$sql = "Update user1 set age=20 where id=7";
$res = $mysqli->query ($sql);
if (! $res) {
Echo "Operation failed". $mysqli->error;
}else{
if ($mysqli->affected_rows>0) {
echo "Success";
}else{
echo "No Line affected";
}
}
Close Resource
$mysqli->close ();
?>
3, the encapsulation
Copy CodeThe code is as follows:
Class sqlhelper{
Private $mysqli;
Here to write dead, and later to write dead things with a file to configure
private static $host = "localhost";
private static $user = "root";
private static $pwd = "root";
private static $DB = "Test";
Public Function __construct () {
$this->mysqli=new mysqli (self:: $host, Self:: $user, Self:: $pwd, Self:: $DB);
if ($this->mysqli->connect_error) {
Die ("Connection failed". $this->mysqli->connect_error);
}
Set character sets
$this->mysqli->query ("Set names UTF8");
}
DQL operate
function Execute_dql ($sql) {
$res = $this->mysqli->query ($sql) or Die ($this->mysqli->error);
return $res;
}
DML operate
function Execute_dml ($sql) {
$res = $this->mysqli->query ($sql) or Die ($this->mysqli->error);
if (! $res) {
Return 0;//failed
}else{
if ($this->mysqli->affected_rows>0) {
Return 1;//Success
}else{
Return 2;//no row to affect
}
}
}
}
?>
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