PHP MySQL? ??????? ?????.
???????? ?? ??? ???? ???? ????.
MySQL ??????? ????? ????? CREATE ??? ?????.
MySQLi? PDO? ???? MySQL ?????? ??
CREATE DATABASE ?? MySQL?? ??????? ???? ? ?????.
?? ???? "myDb"?? ??????? ?????.
????(MySQLi - ?? ??)
<?php
$servername = "localhost";
$username = "username";
$password ="password";
// 創(chuàng)建連接
$conn =new mysqli($servername, $username, $password);
// 檢測連接
if ($conn->connect_error) {
die("連接失敗: " . $conn->connect_error);
}
// 創(chuàng)建數(shù)據(jù)庫
$sql = "CREATE DATABASE myDB";
if ($conn->query($sql) === TRUE) {
echo "數(shù)據(jù)庫創(chuàng)建成功";
} else {
echo "Error creating database: " . $conn->error;
}
$conn->close();
?>??: ? ??????? ??? ? mysqli ??? ?? ? ?? ????(?? ??, ??? ?? ? ????)? ???? ???.
?: ?? ??(???? 3306)? ???? ?? ?????? ????? ? ???? ?????. ?: new mysqli("localhost", "username", "password", " ", port)
?????? ?? ??? ??:
1. ???? ??? ??? ? ????. ??????(??? ??, ?? ???)
2. ?????? ???? ???(???)? ???? ???
3. ?????? ???? ?? ??? ???? ???. ?, ??? ??? ? ????. ?? ??
????(MySQLi ???)
<?php
$servername = "localhost";
$username = "username";
$password ="password";
// 創(chuàng)建連接
$conn = mysqli_connect($servername,$username, $password);
// 檢測連接
if (!$conn) {
die("連接失敗: " . mysqli_connect_error());
}
// 創(chuàng)建數(shù)據(jù)庫
$sql = "CREATE DATABASE myDB";
if (mysqli_query($conn, $sql)) {
echo "數(shù)據(jù)庫創(chuàng)建成功";
} else {
echo "Error creating database: " . mysqli_error($conn);
}
mysqli_close($conn);
?>??: ??? PDO ????? ???? "myDBPDO" ??????? ?????. :
????
PDO ??:
<?php
$servername = "localhost" ;
$username = "username";
$password = "password";
try {
$conn = new PDO ("mysql:host=$servername;dbname=myDB", $username, $password);
// 設(shè)置 PDO 錯誤模式為異常
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "CREATE DATABASE myDBPDO" ;
// 使用 exec() ，因為沒有結(jié)果返回
$conn->exec($sql);
echo "數(shù)據(jù)庫創(chuàng)建成功<br>" ;
}
catch(PDOException $e)
{
echo $sql . "<br>" . $e-> getMessage();
}
$conn = null;
?>?: PDO ??? ?? ? ?? ??? ???? ?? ?????? ?? ?? ??? ??? ? ?? ???? ??? ? ??? ????. try{ } ?? ???? ??? ???? ????? ??? ???? ? ?? catch(){ } ?? ???? ???? ??? ?????. ??? ??? ?? ????? SQL ?? ???? ?? ???? ?????.
PDO::setAttribute — ??? ?????. ??? ??? PDO::setAttribute
phpMyAdmin ??
? ?????. phpMyAdmin? ?? ??? ?? ??? ? ???? ?????. ??? ??? "??" ?? ??:
? ?????? ??
CREATE DATABASE db_name;
?????? ??
Create ? ??????? ??? ? ?? ??? ?? ?? ??? ??????? ? ? ????:
SHOW CREATE DATABASE db_name;
?????? ??
?????? ?? ? ??????? ???? ???.
mysql_select_db()? ??????? ???? ? ?????. ???? true? ????, ???? false? ?????.
??? ???? mysqli_select_db() ??? ?????.
