php mysqli扩展库的使用

php mysqli扩展库的使用

数据库结构1.连接数据库

$hostname = 'localhost'; //主机名

$dbname = 'yian';        //数据库名

$username = 'root';      //用户名

$psw = 'root';          //用户密码

$charset = 'utf_8';     //mysql编码

$mysqli =new mysqli($hostname,$username,$psw,$dbname);

$mysqli->set_charset($charset);

$selectdb = $mysqli->select_db($dbname);

$sql = "select

name

,

age

from

test01

";

$insertsql = "insert into

test01

(

name

,

tel

) values('test',999)";

//执行一条sql语句

$res = $mysqli->query($sql);

$res = $mysqli->query($insertsql);

//返回插入操作后的id

$num = $mysqli->insert_id;

echo $num;exit;

/*

* 输出

* 6

* */

//返回受影响的条数

$num = $mysqli->affected_rows;

echo $num;exit;

/*

* 输出

* 5

//返回索引数组

$out = $res->fetch_row();

/*输出：

查询出第一条记录

Array

(

[0] => A

[1] => 21

)*/

while(list($tel,$age)=$res->fetch_row()){

echo $tel.' age is '.$age."\n";

}

/*

* 输出：

A age is 21

B age is 15

C age is 21

D age is 14

E age is 26

*  */

/返回关联数组

$out = $res->fetch_assoc();

print_r($out);exit;

/*

* 输出

* 输出第一条关联数组

* Array

(

[name] => A

[age] => 21

)

*/

while($row = $res->fetch_assoc()){

echo $row['name'].' age is '.$row['age']."\n";

}

/*

* 输出

A age is 21

B age is 15

C age is 21

D age is 14

E age is 26

* */

`//返回对象out=res->fetch_object();var_dump($out);exit;/** 输出object(stdClass)#3 (2) {[“name”]=>string(1) “A”[“age”]=>string(2) “21”}*/while(row=res->fetch_object()){echo row−>name.′ageis′.row->age.”\n”;}/** 输出:A age is 21B age is 15C age is 21D age is 14E age is 26*/

//使用 mysqli_stmt 类/** mysql4.1版本开始提供一种预处理（prepared statement）的机制，它可以见整个命令向MYSQL服务器发送一次，* 以后只有参数变化，MYSQL只需要对命令做一次的分析就够了，* 大大减少需要传输的数据量，还提高了命令的处理效率(注，在不需要连接时应该立刻关闭close())* 使用预准备语句可提高重复使用语句的性能，* 在PHP中，使用prepare()方法来进行预准备语句查询，* 使用execute()方法来执行预准备语句。PHP有两种预准备语句：一种是绑定结果，另一种是绑定参数。* *///1预备sql命令//$sql = “select ?,?,?, form

test01

where

gender

=1 “;$sql = “select ?,?,? from

test01

where

gender

=1 “;//$sql = “select

name

,

age

,

tel

from

test01

where

gender

=? “;stmt=mysqli->prepare(sql);name = ‘name’;age=‘age′;tel = ‘tel’;//2绑定参数stmt−>bindparam(′sss′,name,age,tel);//stmt−>bindparam(′s′,gender);//$gender = 1;//执行out=stmt->execute();//2绑定结果stmt−>bindresult(sname,sage,stel);while(stmt−>fetch())echo$sname.′ageis′.$sage.′telis‘.$stel.”\n”;//关闭预处理的sqlstmt->close();//关闭数据库$mysqli->close();`