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老师批语：
预处理实现更新数据
$sql = "UPDATE staff SET name=?,salary=? WHERE staff_id=?;";
$stmt = mysqli_stmt_init($db);
if (mysqli_stmt_prepare($stmt,$sql)){
mysqli_stmt_bind_param($stmt,'sii',$name,$salary,$staff_id);
$name = 'xiaolongnn';$salary = 5600;$staff_id=15;
if(mysqli_stmt_execute($stmt)){
if (mysqli_stmt_affected_rows($stmt)>0){
echo '更新成功，记录:' . mysqli_stmt_affected_rows($stmt);
}else{
echo '没有更新记录';
}
}else{
exit(mysqli_stmt_errno($stmt) . ':' . mysqli_stmt_error($stmt));
}
}else{
exit(mysqli_stmt_errno($stmt) . ':' . mysqli_stmt_error($stmt));
}
mysqli_stmt_close($stmt);
mysqli_close($db);预处理实现删除数据
require 'mysqli-connect.php';
$sql = "DELETE FROM staff WHERE staff_id=?";
$stmt = mysqli_stmt_init($db);
if (mysqli_stmt_prepare($stmt,$sql)){
mysqli_stmt_bind_param($stmt,'i',$staff_id);
$staff_id = 19;
if(mysqli_stmt_execute($stmt)){
if (mysqli_stmt_affected_rows($stmt)>0){
echo '删除成功:' . mysqli_stmt_affected_rows($stmt);
}else{
echo '删除失败';
}
}else{
exit(mysqli_stmt_errno($stmt) . ':' . mysqli_stmt_error($stmt));
}
}else{
exit(mysqli_stmt_errno($stmt) . ':' . mysqli_stmt_error($stmt));
}
mysqli_stmt_close($stmt);
mysqli_close($db);总结
预处理操作：使用mysqli_stmt_init()创建stmt对象
mysqli_stmt_prepare检测stmt对象
mysqli_stmt_bind_param()邦定stmt对象
执行stmt对象mysqli_stmt_excute()
mysqli_stmt_close($stmt);关闭预处理对象
mysqli_close($db);不要忘记关闭数据库
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