php与mysql 绑定变量和预定义处理
非select 语句(没有结果集的)
1.建立连接数据库
$mysqli=new mysqli("localhost","root","","sqldb");
2.判断
if(mysqli_connect_error()){
echo "连接数据库失败".mysqli_connect_error();
exit;
}
3.SQL语句拼装
$sql="insert into shops(name,price,description) values(?,?,?,?)";
$sql="update shops set name=?,price=?,num=?,description=?; where id=?";
4.插入SQL 语句
$stmt=$mysqli->prepare($sql);//比较方便
5.给每一个符号的?传值(绑定参数)
$stmt->bind_param("sdisi",$name,$price,$num,$description,$id);
6.传值
$name="zhangsan";
$price=22.22;
$num=10;
$description="very good";
$id=10;
7.执行
$stmt->execute();
影响行数:$stmt->offected_rows;
最后插入的ID:$stmt->insert_id;
$mysqli=@new mysqli("localhost","root","","sqldb"); if(mysqli_connect_error()) { echo "连接数据库错误".$mysqli_connect_error(); } /*拼装数据*/ $sql="insert into shop values (null,?,?,?)"; $sql="update shop set name=?,price=?,description=? where id=?"; /*插入数据*/ $stmt=$mysqli->prepare($sql); /*绑定数据*/ $stmt->bind_param("sdsi", $name, $price, $description, $id); /*赋值*/ $name="zhangsanasdfadfasdfasdf"; $price=2.3; $description="very good"; $id=1; /*执行*/ $stmt->execute();
select 语句(有结果集的)
1.连接数据库
$mysqli=new mysqli("localhost","root","","sqldb");
2.判断数据库
if(mysqli_connect_error()){
echo "Error:".mysqli_connect_error();
}
3.拼接数据库
$sql="select id,name,price,description where id=?";
4.插入数据库
$stmt=$myqli->prepare($sql);
5.绑定数据库
$stmt->bind_param(i,$id);
6.绑定结果集
$stmt->bind_result($id,$name,$price,$description);
7.赋值
$id=10;
8.执行
$stmt->execute();
9.取出结果集
$stmt->store_result();
10.while 查看结果
while($stmt->fetch()){
echo "$id---$name---$price--$description";
}
11.关闭结果集
$stmt->free_result();
12.关闭数据库
$stmt->close();
<?php $mysqli= @new MySQLi("localhost","root","","sqldb"); if(mysqli_connect_error()) { echo "Error:".mysqli_connect_error(); } /*拼装SQL*/ $sql="select id,name,price,description from shop where id<?"; /*插入*/ $stmt=$mysqli->prepare($sql); var_dump($stmt); /*绑定*/ $stmt->bind_param(i,$id); /*绑定结果集*/ $stmt->bind_result($id,$name,$price,$description); /*赋值*/ $id=10; /*执行*/ $stmt->execute(); /*取出结果集*/ $stmt->store_result(); echo "<table border='1'>"; //字段信息、列信息 $result=$stmt->result_metadata(); echo "<tr>"; while($field=$result->fetch_field()) { echo "<th>{$field->name}</th>"; } echo "</tr>"; /*fetch()查看结果集*/ /*移动数据库指针*/ //$stmt->data_seek(2); while($stmt->fetch()){ echo "<tr>"; echo "<td>$id</td><td>$name</td><td>$price</td><td>$description</td>"; echo "</tr>"; } echo "</table>"; /*关闭结果集*/ $stmt->free_result(); /*关闭数据库d*/ $stmt->close();?>