将多个数据插入 MySQL 并更新(如果存在) [英] Insert multiple Data to MySQL and Update if existing
问题描述
我在同时插入和更新数据库时遇到问题,我有一个用户可以编辑信息或添加新字段的表单,我想要的是用户何时编辑表单以及用户是否添加了新字段(s) 我希望我可以一起插入和更新数据库.
I have a problem to insert and update database at the same time, I have a form that user can edit the information or add new field, what I want is when an user edits the form and if the user adds new filed(s) I want I can insert and update the database together.
这是我的代码
function insert_update_db(){
global $db;
$section = $_POST["page"];
$fieldsArray = array( "section_id", // Primary key
"section_title",
"section_name",
"section_content",
);
$fields = '`' . implode('`, `', $fieldsArray ) . '`';
$sql = "INSERT INTO `db_section` ($fields) VALUES";
$valueArray = array();
$indexKey = array();
foreach ($section["section"] as $value) {
$section_id = ($value["section_id"] != "" ? $db->quote($value["section_id"]) : "NULL" ); // Check if curr field has a ID
$title = $value["title"];
$name = $value["name"];
$content = $value["content"];
$valueArray[] = "($section_id, '$title','$name', '$content')";
if($section_id != "NULL"){
$indexKey[] = str_replace("'", "", $section_id);
$sql_update = "UPDATE `db_section` SET
`section_title` = '$section_title',
`section_name` = '$name',
`section_content` = $content
WHERE `section_id` = $section_id;";
$update = $db->query($sql_update);
echo $sql_update;
if($update){
$db->sql_status = "Success";
}
}
}
$sql .= implode(",", $valueArray);
$sql .= " ON DUPLICATE KEY UPDATE ";
$sql .= "section_id=" . implode(" AND section_id=", $indexKey);
$insert = $db->query($sql);
if($insert){
$db->sql_status = "Success";
}else{
$db->sql_status = "Error";
}
}
在编辑页面中,我添加了隐藏输入 section_id
以获取正在编辑的字段的主键,并将为新字段提供 NULL
,在我尝试执行的操作中do if section_id !='NULL'
then UPDATE
字段.
In edit page I added hidden input section_id
to get primary key for the field is being edit, and will give NULL
for a new field, on action I try to do if section_id != 'NULL'
then UPDATE
the field.
我尝试使用 ON DUPLICATE KEY UPDATE
来检查 section_id
是否重复,但它根本不起作用.
I tried to use ON DUPLICATE KEY UPDATE
to check if section_id
is duplicate but it does not work at all.
对不起我的英语,任何帮助将不胜感激:)
Sorry about my English, any help will be appreciated :)
推荐答案
只需要一个索引冲突,该冲突将违反要更新的行的重复项,而不是要创建的新行.索引冲突可以是主键,也可以是另一个索引上的一个,可以是单列或跨多列的复合索引.
All it takes is one index clash that would violate a duplicate for the row to be updated, and not for a new row to be created. The index clash can be a primary key, a one on another index be it single column or composite index across multiple columns.
当然,下面的内容相当蹩脚,但我现在可以尽其所能.
Granted the below is rather lame, but as imaginative as I can do right now.
create table user
(
id int auto_increment primary key,
userName varchar(20) not null,
friendCount int not null,
unique key(userName)
);
insert user(userName,friendCount) values('Jason7',0) on duplicate key update friendCount=friendCount+1;
select * from user;
+----+----------+-------------+
| id | userName | friendCount |
+----+----------+-------------+
| 1 | Jason7 | 0 |
+----+----------+-------------+
insert user(userName,friendCount) values('Fred',0) on duplicate key update friendCount=friendCount+1;
select * from user;
+----+----------+-------------+
| id | userName | friendCount |
+----+----------+-------------+
| 1 | Jason7 | 0 |
| 2 | Fred | 0 |
+----+----------+-------------+
insert user(userName,friendCount) values('Fred',0) on duplicate key update friendCount=friendCount+1;
+----+----------+-------------+
| id | userName | friendCount |
+----+----------+-------------+
| 1 | Jason7 | 0 |
| 2 | Fred | 1 |
+----+----------+-------------+
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