ok so i have a php array it looks like
array('somehash' => 'someotherhash', 'somehash2' => 'someotherhash2');
here somehash = producthash and someotherhash = tohash
$db->query('UPDATE sometable SET status = '.self::STATUS_NOT_AVAILABLE.', towhere = '.self::TO_WHERE.', '.
.'tohash = WHEN or IF or ??? and how ?, '.
.'WHERE status = '.self::STATUS_AVAILABLE.' AND '.
.'producthash IN (' . implode(',' , $prodarray) . ')') or $db->err(__FILE__,__LINE__);
so in the above query i want tohash value to be fetched from the php array via producthash mysql field
something like tohash = IF(producthash IN '.$prodarray.', $prodarray['producthash'] , whatever)
ofcourse the above IF wont work cause i dont have the producthash value in $prodarray['producthash']
anyone knows a way around this because i have more than 1000 values in the array and dont want to run thousand updates
the INSERT INTO ON DUPLICATE KEY is not possible in this cause because this table unique key is based on 3 fields and i dont have all the three field values while doing this update.
A subquery?
UPDATE ...
WHERE ... producthash in (SELECT * FROM products)
This will work as long as you're not selecting from the same table you're updating - mysql doesn't allow that without workarounds.
Related
Okay so this is my first question and I really have no idea how to ask it so I'm going to try and be as specific as possible. My website is an online game and for user inventories when it inserts a new item into the database
Table name "inventory"
Column names "inv_id", "inv_itemid", "inv_userid", "inv_qty"
and it does not add to the column inv_qty and populate properly instead it creates a new inv_id identifier and row for each item. I was wondering if there was a way for me to create a merge function via php to merge all items with the same inv_itemid and inv_userid while adding to the inv_qty colum and populating the inv_id
In my inventory.php file the inv_id column is used to let the user either equip the item or use it as the main variable.
I have seen this done and have tried many times and I just can't get it to work.
If it were a single key to check then you could have used 'ON DUPLICATE KEY UPDATE' of mysql like the following:
INSERT INTO table(field1, field2, field3, ..)
VALUES (val1, val2, val3, ...)
ON DUPLICATE KEY
UPDATE field3='*'
But in your case there is a combination to consider.
If "inv_id", "inv_itemid", "inv_userid" mathces then UPDATE, otherwise INSERT.
One way to achieve this using only mysql in a single query is to create & use a Stored Procedure.
But using php you can achieve this in 2 query. First query is to determine if the combination exists. Then based on this run the next Insert or Update query.
Please check the following example:
$sql1 = SELECT * FROM inventory WHERE inv_id='$inv_id', inv_itemid='$inv_itemid', inv_userid='$inv_userid'
// Execute $sql1 and get the result.
IF result empty, then INSERT:
$sql2 = INSERT INTO inventory ....
otherwise UPDATE.
$sql2 = UPDATE inventory SET inv_qty=(inv_qty + $update_qty) WHERE inv_id='$inv_id', inv_itemid='$inv_itemid', inv_userid='$inv_userid'
About:
Would there be a way to write a php function at the top of the inventory page for my users to click to merge them
Please check with the following php function.
By calling with param: UserID, it will create a new entry with sum of the inv_qty, for each (inv_itemid + inv_userid) combination and removes the previous duplicate entries of (inv_itemid + inv_userid) leaving the newly enterd: (inv_itemid + inv_userid + (SUM of inv_qty)).
Important, please keep a back up of the DB Table Data before running the function.
Please check the comments in the function and update where necessary based on your system, Like getting the last inserted inv_id.
function merger_fnc($user_id) {
// For Each Combination of: inv_itemid + inv_userid
// This function will Insert a new row in the inventory with the SUM of inv_qty
// And then will remove the previous single rows of: inv_itemid + inv_userid + inv_qty
// First get the distinct Items of the User(by UserID);
$inv_itemids = $db->query("SELECT DISTINCT(inv_itemid) FROM inventory WHERE inv_userid=".$user_id);
// Here $inv_itemids will hold all the distinct ItemIDs for the UserID;
foreach ($inv_itemids as $inv_item) {
// We will Insert A new row which will have the sum of 'inv_qty' for the inv_userid & inv_itemid;
$inv_itemid = $inv_item['inv_itemid'];
// I am not sure what type of result set your $db->query(...) returns. So I assumed it is associative array.
// If the result is an Array of objects, then please use: $inv_itemid = $inv_item->inv_itemid;
$insert_sql = "INSERT INTO inventory (inv_itemid, inv_userid, inv_qty) VALUES ('".$inv_itemid."', '".$user_id."', (SELECT SUM(inv_qty) FROM FROM inventory WHERE inv_userid=".$user_id."))";
$inv_itemids = $db->query($insert_sql);
$inserted_new_inventory_id = $db->insert_id;
// Please check the appropriate method for it in your $db class here.
// In mysqli, it is: mysqli_insert_id($db_conn); In PDO it is: $db_conn->lastInsertId();
// Last we remove the previous data of combination(inv_userid & inv_itemid) but leaving our last inserted row.
$delete_sql = "DELETE FROM inventory WHERE inv_id!='".$inserted_new_inventory_id."' AND inv_userid='".$user_id."' AND inv_itemid='".$inv_itemid."'";
$db->query($delete_sql);
}
}
If getting the last inserted inv_id is troublesome from $db(like inv_id is not defined as key in the table), you can try another approach:
Do another query and save the previous inv_id in an array, before the insertion.
After the insertion of the new entry with sum of qty, run a delete query to delete the previous single qty entries, like the following:
DELETE FROM inventory WHERE inv_id IN (3, 4, 7,...)
Here (3, 4, 7,...) are the previous inv_id for (inv_itemid + inv_userid) combination.
I am looking for some inspiration from someone wiser than me with PHP/MySQL.
In have a database application, and in this instance there are two primary tables and one child table.
Primary Table 1 - Documents
Primary Table 2 - JobDesriptions
Child Table - LnkDocuments_JobDescriptions, which as the title suggests is a one to many relational table between the Document and Job Description Table. In my Documents Table I have a field which is a lookup of JobDescriptions and presents options as a checkbox, this field is called 'AppliesTo', because of the way the application works, the field stores the results as a string, eg "1,2,3,4,5) I have used the explode function to turn this into an array and then insert each record into the child table, as I prefer 1-2-many relationships. This is the code that I have, and it works.
$jdarray = explode(',',$values['AppliesTo']);
foreach($jdarray as $item)
{
$sql2 = "INSERT INTO LnkDocuments_JobDescriptions (DocumentFk, JobDescriptionFk)
values ('".$keys["DocumentPk"]."', '$item')"; CustomQuery($sql2);
}
The problem I now have is that if that table gets updated, I need to also update the child table, i have tried this code (but quickly realised that it is wrong):
$jdarray = explode(',',$values['AppliesTo']);
foreach($jdarray as $item)
{
$sql = "SELECT * FROM LnkDocuments_JobDescriptions WHERE DocumentFk='".$keys["DocumentPk"]."' AND JobDescriptionFk='$item'"; ;
$num_rows = mysql_num_rows(CustomQuery($sql));
if ($num_rows > 0) //Delete Record
{
$sql2 = "DELETE FROM LnkDocuments_JobDescriptions WHERE DocumentFk='".$keys["DocumentPk"]."' AND JobDescriptionFk='$item'"; CustomQuery($sql2);
echo "JD FK : ".$item." deleted";
}
else //Insert Record
{
$sql3 = "INSERT INTO LnkDocuments_JobDescriptions (DocumentFk, JobDescriptionFk)
values ('".$keys["DocumentPk"]."', '$item')"; CustomQuery($sql3);
echo "JD FK : ".$item." added";
}
}
It occured to me that I need to compare differences in the arrays, but havent got a clue how to do this, but this is what I need:
If I can get $oldarray and $new array to compare, for example
if in old array there were values 1,2,3,4 and in $newarray there were values 1,2,3,5, I want the code to loop through each value to determine if there is a change, e.g. if value exists in old and new array then do nothing, if value exists in old array but not new then delete, if value exists in new array but not old then insert.
I have also thought about just deleting all associated records and adding again, but think this is bad practice and will result in high number primary key, also it is worth noting that in my example there are only 5 options, this is just for testing, in reality there could be dozens.
Thanks in advance
If you are trying to optimize things I'm not sure that reading the values already present in the table and then deleting only those are not in the new version while inserting the missing records is the best way to go. In my opinion it would be much faster to just delete everything in one query, then insert all records in one query. Try something like this:
$item_list = implode( ',' , $jdarray );
$delete_query = "DELETE FROM LnkDocuments_JobDescriptions WHERE DocumentFk='".$keys["DocumentPk"]."' AND JobDescriptionFk IN ( $item_list )";
CustomQuery($delete_query);
$document_key = "'" . $keys["DocumentPk"] . "'";
$item_list_to_insert = "($document_key, " . implode( "), ($document_key, ", $jdarray ) . ")";
$insert_query = "INSERT INTO LnkDocuments_JobDescriptions (DocumentFk, JobDescriptionFk) VALUES " . $item_list_to_insert;
CustomQuery($insert_query);
Note: I didn't test this, there might some debugging needed.
I'm trying to update a record if the key is known else I want to insert it and get the inserted id, currently I have:
if(isset($data['applicationId']))
{
//update
$sql="
UPDATE myTable SET data='jsonstring' WHERE id = {$data['applicationId']}
";
}
else
{
//insert and get id
$sql="
INSERT INTO myTable SET data='jsonstring'
";
}
Is it possible to simplify the above to one query using INSERT ...ON DUPLICATE KEY UPDATE even when the key is not always known ?
I've tried this:
INSERT INTO myTable
(
id,
data
)
VALUES
(
?, # <- I may not know this!!
'jsonstring'
)
ON DUPLICATE KEY UPDATE
data = 'jsonstring'
Thanks for any suggestions.
Yes, you can do that, assumed id is your primary key and auto_increment. You will have two different queries, one if you know the applicationId and one when you not knowing it.
The first, when you know it:
INSERT INTO myTable
(
id,
data
)
VALUES
(
1337, # <- insert id
'jsonstring'
)
ON DUPLICATE KEY UPDATE
data = 'jsonstring';
And the one if the applicationId is unknown:
INSERT INTO myTable
(
id,
data
)
VALUES
(
NULL, # <- This will cause mysql to use a auto_increment value
'jsonstring'
)
ON DUPLICATE KEY UPDATE
data = 'jsonstring';
So you can conclude this to:
$sql="INSERT INTO myTable
(
id,
data
)
VALUES
(" .
isset($data['applicationId']) ? $data['applicationId'] : 'NULL'
.",
'jsonstring'
)
ON DUPLICATE KEY UPDATE
data = 'jsonstring';
";
But be aware of How can I prevent SQL-injection in PHP?
Happy coding
Please forgive because your question is not 100% clear. However, the concept I can tell is that you want to be able to ask more than 1 query on 1 sql statement. That can be done with a multi-query command. However, if you want some of your data from a query placed in your next query I do not think it will work. Link provided for multi_query
http://php.net/manual/en/mysqli.quickstart.multiple-statement.php
First, Simple update query will run. If it runs successfully, it will not go to if condition and your ID will be the one which was used in updating.
And, if that ID is not available (means update query fails, $Query will be false), so pointer jumps to if condition and insert the query. Now, new Inserted ID we can get.
$ID=$data['applicationId'];
$Query=mysql_query("UPDATE myTable SET data='jsonstring' WHERE id='$ID' ");
if(!$Query)
{
$InsertQuery=mysql_query("INSERT INTO myTable SET data='jsonstring'");
$ID=mysql_insert_id();
}
So, $ID will be your ID.(either updated or currently inserted)
This question already has answers here:
Is storing a delimited list in a database column really that bad?
(10 answers)
Closed 7 years ago.
I am working on a project and I I have a scenario like this:
I have many field in my table :
table_name : transaction_tbl
-id
-name
-description
-ref_number : text(datatype)
In my inserting here is my code:
$sql = "INSERT INTO transaction_tbl (`name`,`description`,`ref_number`) VALUES ('$name','$desccription',$ref_number)";
if ($conn->query($sql) === false){
trigger_error('Wrong SQL: ' . $sql . 'Error: ' . $conn->error , E_USER_ERROR);
}else {
echo "Successful ! Data is inserted in database ^__^" ;
}
As the name itself ref_number or reference number, so there will be a time that I will have a lot of reference number,how can I let it insert if it will have multiple values?
Thanks :)
UPDATE :
I want something like this :
name description ref_number
bag to be use 10359435846
05438547656
035848576
Its not a good practice to have multiple values in one cell (and you should never unless there is a serious reason). It violates basic db rules. Just split this to two tables and assign foreign keys to link them up.
Learn db normalization. There are lot of examples. In here you need to take your un-normalized (0NF) table to at least to 1st normalized level (1NF). But its advised to make it normalized at least up to 3rd level
google for db normalization tutorials. As you request below image will give you an idea(field names are not same as in your question).
First insert the values to table1(Member table) and get the insert id in php use $iid = mysqli_insert_id()
Next add the multiple values as seperate rows into the second table(database table) along with the primary key obtained in first step.
Keep in mind this is not a tutorial site. find more info on net.
for what purpose ? why don't you just insert a new row with the same name and description with different ref_number ?
but if you would like that , you can concatenate your new ref_number with the existing ..
first check if it already exist
get its value then concatenate the new ref number ..
or if it doesn't exist , insert a new row ..
$sql = "SELECT `ref_number` FROM `transaction_tbl`
WHERE `name`='$name' AND `description`='$description'";
$query = mysql_query($sql);
if(mysql_num_rows($query) > 0)
{
$row = mysql_fetch_array($query);
$new_ref = $row['ref_number'] . '|' . $ref_number;
$upd = "UPDATE `transaction_tbl` SET `ref_number`='$new_ref'
WHERE `name`='$name' AND `description`='$description'";
}
else
{
$ins = "INSERT INTO transaction_tbl (`name`,`description`,`ref_number`)
VALUES ('$name','$desccription',$ref_number)";
mysql_query($ins);
}
I'm creating function (PHP) which has to run every few hours and update some DB table.
1. If row isn't exist - INSERT new row
2. If row exist - UPDATE the current row
I want to write it the easiest and simplest way cause I'll do it for several tables.
You use the insert . . . on duplicate key update statement:
insert into dbtable(cols, . . . )
select <values here >
on duplicate key update col2 = values(col2), col3 = values(col3);
It is documented here.
EDIT:
Assuming you have some unique key on animals, your query would look something like:
insert into animals(animal_id, animal_name)
select #animal_id, #animal_name
on duplicate key update animal_name = values(animal_name);