利用mysqli 大略流程
设置PHP.ini 配置文件
extension=php_mysqli.dll
//创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
//检测连接
if ($conn->connect_error)
{
die(\"大众Connection failed: \"大众 . $conn->connect_error);
}
//获取数据库返回值
if($stmt=$con->prepare(\"大众SELECT username,password FROM member WHERE username=? AND password=?\公众))
{
$stmt->bind_param(\"大众ss\公众,$username,$password);
$stmt->execute();
$stmt->bind_result($U,$P);
$HasData=false;
while($stmt->fetch())
{
$HasData=true;
echo \公众username->\"大众.$U.\公众 password->\"大众.$P.\"大众<br>\"大众;
}
}
//关闭连接
$conn->close();
//常用语法
INSERT INTO [表名] ([字段1],[字段2]) VALUES ([值1],[值2]);
SELECT FROM [表名] WHERE [表达式] ORDER BY [字段1],[ASC/DESC 升/降] [字段2],[ASC/DESC 升/降];
DELETE FROM [表名] WHERE [表达式];
UPDATE [表名] SET [字段1]=[值1],[字段2]=[值2] WHERE [表达式];
获取总行数:SELECT COUNT() FROM [表]
//中文乱码
//针对页面
header(\公众Content-Type:text/html;charset=utf-8\"大众);
//针对数据库
mysqli->query(\"大众SET CHARACTER SET 'utf8'\"大众);//读库
mysqli->query(\"大众SET NAMES 'utf8'\"大众);//写库
以下是一些实例
连接mysqli
建立MYSQL配置文件 config.ini.php
config.ini.php 内容如下:
<?php
$dbhost =\公众locallhost\公众;
$dbuser = \公众hehehe\"大众;
$dbpwd = \公众123456\"大众;
$dbname = \"大众Student\"大众;
$charName = \"大众gbk2312\"大众; 设置查询字符集gbk,gbk2312,utf-8
?>
(用mysqli链接MYSQL数据库)
requery_once(\"大众config.ini.php\"大众);
$mysqliObj = new mysqli($dbhost,$dbuser,$dbpwd,$dbname);
if(mysqli_connect_errno()){
echo \公众连接失落败\公众.mysqli_connect_error();
exit();
}
$mysqliObj->query(\"大众set name $charName\"大众);
(其他操作)
查询
(单条查询)
$sql = \"大众drop table if exists user;\"大众;
$mysqliObj->query($sql);
(多条查询)
$musqliObj->multip_query($sql)
返回实行$sql受影响的行数()
if($mysqliObj->query($sql))
echo $mysqliObj->affected_rows;
insert 插入时,返回插入的id (很有用)
$num = $mysqliObj->insert_id;
三种处理查询结果
$sql = \公众select from user\公众;
$result = $mysqli->query($sql);
(1)fetch_row() 返回索引数组
fetch_row()
while(list($id,$name,$pwd)=$result->fetch_row()){
echo \"大众id: \"大众.$id.\"大众 name:\公众.$name.\"大众 pwd:\"大众.$pwd.\"大众<br>\"大众;
}
(2)fetch_assoc() 返回关联数组
fetch_assoc()
while ($row = $result->fetch_assoc()){
echo \公众id:\公众.$row[\"大众userId\"大众].\公众 name:\"大众.$row[\"大众userName\"大众].\"大众 pwd:\"大众.$row[\"大众password\公众].\公众<br>\"大众;
}
(3)fetch_object()返回工具
while($row = $result->fetch_object()){
echo \公众id:\公众.$row->userId.\"大众 name:\"大众.$row->uerName.\"大众 pwd:\"大众.$row->password.\公众<br>\"大众;
}
关联数组,便是嵌套的数组 如:
<?php
$data = array(
array('name' => 'John Smith', 'home' => '555-555-5555',
'cell' => '666-555-5555', 'email' => 'john@myexample.com'),
array('name' => 'Jack Jones', 'home' => '777-555-5555',
'cell' => '888-555-5555', 'email' => 'jack@myexample.com'),
array('name' => 'Jane Munson', 'home' => '000-555-5555',
'cell' => '123456', 'email' => 'jane@myexample.com')
);
?>
利用 mysqli_stmt 类
mysql4.1版本开始供应一种预处理(prepared statement)的机制,它可以见全体命令向MYSQL做事器发送一次,往后只有参数变革,MYSQL只须要对命令做一次的剖析就够了,大大减少须要传输的数据量,还提高了命令的处理效率(注,在不须要连接时该当急速关闭close())
步骤:
1,预备SQL命令
$sql = \公众insert into user(name,pwd) values(?,?)\"大众;
$stms = $mysqli->prepare($sql);
2.绑天命据
$stms->bind_param('ss',$name,$pwd); (把稳'ss':其要与后面的变量对应($name,$pwd)
i 所有inerger类型
d double 或float 类型
s 所有其他类型包括字符串
b 二进制(blob,二进制字节串)
)
$name = \公众huang\公众;
$pwd = \公众123456\"大众;
3.实行
$stms->execute();
[4.在绑定实行另一组数据
$name = \"大众he\"大众;
$pwd = \"大众666666\公众;
$stms->execute();
]
5.关闭
$stmt->close();
$mysqli->close();
(其他有用参数)
$num = $stmt->affected_rows; 受影响的行数
$id = $stmt->insert_id; 当是插入命令时,返回插入的行id(自动)
事务处理
在默认情形下,MYSQL因此自动提交(autocommit)模式运行,这就意味着所实行的每一个语句都将立即写入数据库中,但如果利用事务安全的表格类型,是不肯望自动提交的行为的
事务处理
当实行多条MYSQL命令时,当然希望当个中一条命令出错时,所有的命令都不实行,返回实行命令之前的状态
这就用到事务了
大略利用事务流程
1.写好SQL命令
$sql1 = \公众insert user(name) values('huang','123456')\"大众;
$sql2 = \公众update account set number = number+1\公众;
2.关闭MYSQL事务处理的自动提交模式
$mysqli->cutocommit(0);
3.试实行命令
$success = true;
$res1 = $mysqli->query($sql1);
if(!$res1 or $mysqli->affected_rows !=1){
$success = false;
}
$res2 = $mysqli->query($sql2);
if(!$res2 or $mysqli->affected_rows !=1){
$success = false;
}
4.查看实行情形,都成功实行,有失落败回滚初态
if($success ){
$mysqli->commit();
echo \"大众实行成功\公众;
}else{
$mysqli->rollback();
echo \公众实行失落败\"大众;
}
5.规复MYSQL事务处理的自动提交模式
$mysqli->cutocommit(1);
$mysqli->close();
mysql 目前只有InnDB和BDB两种数据包类型才支持事务
InnoDB最快
(创建InnDB类型表)
create table user(
id int(10) not null auto_increment,
name varchar(50) not null,
pwd varchar(50) not null,
primary key(id)
)type=InnoDB