PHP数据库MySQL部分
1.环境部署
XXamp是真的强，简化了mysql后，继承到这里，虽然，往后发展局限性很强不过这完全无所谓，
本来就是主打的小中型项目。
所以如果说是环境部署，如果配置了PHP的基本上都已经搭建好了！
2.数据库起手
1.链接数据库的语句
2.需要执行的语句
3.两者之间的联系
4.关闭数据库
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/9/20 0020
* Time: 18:15
*/
$servername = "localhost";
$username = "root";
$password = "";
/*-----------------mysqli创建数据库---------------------*/
//////创建链接
//$conn=new mysqli($servername,$username,$password);
//
/////测试链接
//
//if ($conn->connect_error)
//{
// die("链接失败:".$conn->connect_error);
//}
//echo "链接成功".PHP_EOL;
//
/////创建数据库
//
//$sql="CREATE DATABASE myDB";
//
//if (mysqli_query($conn,$sql))
//{
// echo "创建成功";
//}
//else {
//
// echo "请重试".mysqli_connect_error();
// }
//mysqli_close($conn);
/*----------------------pdo来创建数据库------------------------*/
try {
///创建链接
$conn = new PDO("mysql:host=$servername", $username, $password);
///数据库语句
$sql = "CREATE DATABASE thebase";
///执行数据库语句
$conn->exec($sql);
echo "再次创建成功";
}
catch (PDOException $e)
{
echo "创建失败".$e->getMessage();
}
?>
以上便是，从链接数据库到创建数据库的过程，两个办法，或一个办法的，如果程序出错了的话
可以比较清楚的知道出错部分在哪里！
2.数据库的增删改查
/**
* Created by PhpStorm.
* User: lck
* Date: 2018/9/22 0022
* Time: 11:28
*/
$servername="localhost";
$usename="root";
$password="";
$dbname="myDB";
////创建链接
$conn=new mysqli("$servername","$usename","$password",$dbname);
if ($conn->connect_error)
{
die("链接失败".$conn->connect_error);
}
echo "链接成功".PHP_EOL;
///创建表
///
//$thesql = "CREATE TABLE thesql (
//id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
//firstname VARCHAR(30) NOT NULL,
//lastname VARCHAR(30) NOT NULL,
//email VARCHAR(50),
//reg_date TIMESTAMP
//)";
//
//if ($conn->query($thesql)==TRUE)
//{
// echo "创表成功！";
//}
//else
// {
// echo "创表失败，请重试";
// }
///插入数据
///
//$insetsql = "INSERT INTO MyGuests (firstname, lastname, email)
//VALUES ('lck', 'lck1', 'lck@example.com')";
//
//if ($conn->query($insetsql)==TRUE)
//{
// echo "插入成功！！";
//}
//else
//{
// echo "插入失败".$conn->connect_error;
//}
///插入多条数据
//$sql = "INSERT INTO MyGuests (firstname, lastname, email)
//VALUES ('John', 'Doe', 'john@example.com');";
//$sql .= "INSERT INTO MyGuests (firstname, lastname, email)
//VALUES ('Mary', 'Moe', 'mary@example.com');";
//$sql .= "INSERT INTO MyGuests (firstname, lastname, email)
//VALUES ('Julie', 'Dooley', 'julie@example.com')";
//
//mysqli_multi_query($conn, $sql) 可用这条
//if ($conn->multi_query($sql)==TRUE)
//{
// echo "多条数据插入成功";
//}
//else
// {
// echo "多条数据插入失败";
// }
///预处理语句
///
///i - integer（整型）
//d - double（双精度浮点型）
//s - string（字符串）
//b - BLOB（binary large object:二进制大对象）
///
///
//$stmt=$conn->prepare("INSERT INTO MyGuests (firstname, lastname, email) VALUES (?, ?, ?)");
//$stmt->bind_param("sss",$firstname,$lastname, $email);
//
//// 设置参数并执行
//$firstname = "John";
//$lastname = "Doe";
//$email = "john@example.com";
//$stmt->execute();
//
//$firstname = "Mary";
//$lastname = "Moe";
//$email = "mary@example.com";
//$stmt->execute();
//
//$firstname = "Julie";
//$lastname = "Dooley";
//$email = "julie@example.com";
//$stmt->execute();
//
//echo "数据插入成功";
//
//$conn->close();
//$stmt->close();
////查询数据
//$sql = "SELECT id, firstname, lastname FROM MyGuests";
//$reuslt=$conn->query($sql);
//
//if($reuslt->num_rows>0)
//{
//
// ///遍历数据
// while($row=$reuslt->fetch_assoc())
// {
// echo "id为：".$row["id"]."firstname为：".$row["firstname"]."lastname为：".$row["lastname"];
// }
//}
///按条件进行查询
//$reuslt=mysqli_query($conn,"SELECT * FROM MyGuests
//WHERE firstname='lck'");
//
//while ($row=mysqli_fetch_array($reuslt))
//{
// echo "id为：".$row["id"]."firstname为：".$row["firstname"]."lastname为：".$row["lastname"];
//}
//
////数据排序
//$reuslt=mysqli_query($conn,"SELECT * FROM MyGuests
// ORDER BY id ");
//
//while ($row=mysqli_fetch_array($reuslt))
//{
// echo "id为：".$row["id"]."firstname为：".$row["firstname"]."lastname为：".$row["lastname"];
//}
////数据更新
//$reuslt=mysqli_query($conn,"UPDATE MyGuests SET LastName='lck3'
//WHERE firstname='lck' AND LastName='lck1'");
////数据删除
//mysqli_query($conn,"DELETE FROM MyGuests WHERE lastname='lck3'");
mysqli_close($conn);
?>
部分效果图：
2-1
2-2
