PDO预处理对数据的增删查改1.增

$sql = "INSERT INTO T_product (proid,proname,price,description) VALUES (?,?,?,?)";
// 预处理要执行的语句
$stmt = $dbh->prepare($sql);
$proid = '120019';
$proname = '笔记本';
$price = 12800;
$description = '华硕笔记本,高配置';
$flag = $stmt->execute([$proid,$proname,$price,$description]);
if($flag){
    echo '添加成功'.$dbh->lastInsertId();
}else{
    echo '添加失败';
    die();
}

2. 删除

<?php
//预处理sql语句
$sql = 'DELETE from T_product WHERE id=?';
//准备要执行的语句
$stmt = $dbh->prepare($sql);
$delid = 2;
$flag= $stmt->execute([$delid]);
if($flag){
    echo '删除成功';
}else{
    echo '删除失败';
    die(;)
}

3. 查

$sql = 'SELECT * FROM T_product  WHERE id>?';
$stmt = $dbh->prepare($sql);
$selectid = 1;
$stmt->execute([$selectid]);
$res = $stmt->fetchAll();
if ($res){
    print_r($res);
}else{
    die('查询失败');
}

4. 改

$sql = 'UPDATE T_product SET proid=?,proname=?,price=? WHERE id=?';
$stmt = $dbh->prepare($sql);
$proid = '120016';
$proname = '手机';
$price = 2600;
$updateid=1;
$flag = $stmt->execute([$proid,$proname,$price,$updateid]);
if($flag){
    echo '更新成功';
}else{
    die('更新失败');
}

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