I am stuck at a position where I need to do an insert operation for 'n' number of chapters on one submit button and through one insert query basically in a loop.
Now my question is if a user has passed exam for chapter number 3, then I don't want to insert record for chapter 3. Is this achievable? I've tried to solve this myself but couldn't find a way.
Here is my code:
for($i = 1; $i=5; $i++) {
$sql="INSERT INTO tbl_user_reattempt (ID,user_id,chapter_id,days_for _start,days_for_end,created) VALUES ('','$user_id','$chapter_id','$days_for_start','$days_for_end','$created')";
$result = mysql_query($sql);
if (!$result) {
die('Invalid query: ' . mysql_error());
}
}
What modifications has to be done?
Create unique index for 2 fields: user_id and chapter_id.
Use ON DUPLICATE KEY UPDATE ID = ID in the end of your INSERT query.
Related
I'm relatively new to MYSQL and am having trouble combining idea I have read about. I have a form generated from a query. I want to be able to insert or update depending on whether there is currently a matching row. I have the following code which works for inserting but I;m struggling with the On DUPLICATE UPDATE part I keep getting a message saying there is an error in my syntax or unexpeted ON depending on how I put the ' .
require_once("connect_db.php");
$row_data = array();
foreach($_POST['attendancerecordid'] as $row=>$attendancerecordid) {
$attendancerecordid=mysqli_real_escape_string($dbc,$attendancerecordid);
$employeeid=mysqli_real_escape_string($dbc,($_POST['employeeid'][$row]));
$linemanagerid=mysqli_real_escape_string($dbc,($_POST['linemanagerid'][$row]));
$abscencecode=mysqli_real_escape_string($dbc,($_POST['abscencecode'][$row]));
$date=mysqli_real_escape_string($dbc,($_POST['date'][$row]));
$row_data[] = "('$attendancerecordid', '$employeeid', '$linemanagerid', '$abscencecode', '$date')";
}
if (!empty($row_data)) {
$sql = 'INSERT INTO attendance (attendancerecord, employeeid, linemanagerid, abscencecode, date) VALUES '.implode(',', $row_data)
ON DUPLICATE KEY UPDATE abscencecode = $row_data[abscencecode];
echo $sql;
$result = mysqli_query ($dbc, $sql) or die(mysqli_error ($dbc));
}
The various echo statements are showing that the correct data is coming through and my select statement was as expected before I added in the ON DUPLICATE statement.
You need to fix the way the sql statement is constructed via string concatenation. When you create an sql statement, echo it and run it in your favourite mysql manager app for testing.
$sql = 'INSERT INTO attendance (attendancerecord, employeeid, linemanagerid, abscencecode, date) VALUES ('.implode(',', $row_data).') ON DUPLICATE KEY UPDATE abscencecode = 1'; //1 is a fixed value yiu choose
UPDATE: Just noticed that your $row_data array does not have named keys, it just contains the entire new rows values as string. Since you do bulk insert (multiple rows inserted in 1 statement), you have to provide a single absencecode in the on duplicate key clause, or you have to execute each row in a separate insert to get the absence code for each row in a loop.
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);
}
Im trying to insert Data into a table named team. The table holds 4 colums. selection_id(primary key), player_name, position, and fixture id.
The selection_id has a value of auto_increment. Im adding the player names and position to the table. However the problem is, for each value it extracts out of the arrays, $playnames and $positions, the selection_id updates. Like this:
This is not what I want. 5 names should be stored (thus storing the team selected) in the table before the selection_id updates. OR for each new row, where a new team selection is made, the selection_id must be the same.
Im not sure how to get around this problem. I thought about doing another query after the data has been inserted to overwrite the selection_id and making all the rows (in this case) equal to 117. But im sure this is not the most effecient way to do it.
If anyone can give me a couple of pointers it would be greatly appreciated.
Code follows:
if ( isset($_POST['submit']) ) {
$player_ids = array_map('intval', $_REQUEST['players']);
var_dump($player_ids);
$query = 'SELECT `name`, `position`
FROM `player_info`
WHERE `player_id` IN (' . implode(',', $player_ids) . ')';
$return_names = mysql_query($query) or die(mysql_error());
while ( $row = mysql_fetch_assoc($return_names) ) {
$selected[] = $row['name'];
$position[] = $row['position'];
}
for ($i=0; sizeof($selected) > $i; $i++){
$sql = mysql_query("INSERT INTO `team`(`selection_id`,`player_position`,`player_name`) VALUES ('selection_id\"\"','$position[$i]','$selected[$i]')")
or die(mysql_error());
echo $selected[$i];
echo $position[$i];
echo'<br>';
}
var_dump($selected);
}
I don't know if it can be done with just a sql query or it needs a php code
when a cid is missing
There exist many missing values which I can't handle manually
For example, here I don't have cid=1 and cid=6.
I want to insert a row:
cid=1 tcp_sport='undefined' tcp_dport='undefined'
and
cid=6 tcp_sport='undefined' tcp_dport='undefined'
It seems to me I should create a procedure and insert between lines
another solution that I thaught was that I will create a table with cid and undifined values with the respective order and then join this one with that one and this join should have for example ifnull(tcp_sport,'')
would you please help me?
First, use MAX for get the largest ID.
SELECT MAX(cid) as max FROM table
Then, create a for loop for checking if the individual IDs exist:
for ($i = 0; $i < $max; $i++) {
// $query = ... SELECT 1 FROM table WHERE cid = $i ...
// check if the number of rows for $query is greater than 0
// if not, INSERT INTO table VALUES ($i, DEFAULT, DEFAULT)
}
The whole idea of an auto increment ID is to have a value that only refers to one thing ever. By "inserting between the lines" you may be opening yourself up to a lot of unforeseen problems. Image you have another table that has some values that link to the CID of this table. What if that table already has an entry for CID=1, When you insert a new item with CID=1 it will then join to that supporting record. So Data that really belongs to the original item with CID=1 will show for the new item which it probably has nothing to do with.
You aren't going to run out of ID values (if you are approaching the limit of integer, switch it to bigInt), don't re-use IDs if you can avoid it.
You need to use PHP to automate this.
<?php
$link = mysql_connect("localhost", "mysql_user", "mysql_password");
mysql_select_db("database", $link);
while($i < max_value_cid)//replace max_value_cid by the numeric maximum value of cid (SELECT MAX(cid) as max FROM table)
{
$result = mysql_query("SELECT * FROM `table` WHERE cid=".$i, $link);
if(mysql_num_rows($result) == 0)
mysql_query("INSERT INTO `table` VALUES ($i, NULL, NULL);", $link);
$i++;
}
?>
Do test the query on a sample set before execution and remember to backup the entire table, just-in-case.
I'm new to php. So, please forgive me if this seems like a dumb question.
Say i have a MySQL insert statement insert into table (a,b) values (1,2),(3,4),(5,6). table 'table' has a auto increment field called 'id'.
how can I retrieve all the ids created by the insert statement above?
It will be great if i get an example that uses mysqli.
You can't. I would suggest that you maintain your own ids (using guid or your own auto-increment table) and use it when you insert into the table.
But it's possible to get the auto-increment value for the last inserted using LAST_INSERT_ID():
http://dev.mysql.com/doc/refman/5.0/en/getting-unique-id.html
AngeDeLaMort's answer is almost right. Certainly, the most appropriate way to deal with the problem is to insert one row at a time and poll the insert_id or generate the sequence elsewhere (which has additional benefits in terms of scalability).
I'd advise strongly against trying to determine the last insert_id and comparing this the most recent insert_id after the insert - there's just too may ways this will fail.
But...an alternative approach would be:
....
"INSERT INTO destn (id, data, other, trans_ref)
SELECT id, data, other, connection_id() FROM source";
....
"SELECT id FROM destn WHERE trans_ref=connection_id()";
....
"UPDATE destn SET trans_ref=NULL where trans_ref=connection_id()";
The second query will return the ids generated (note that this assumes that you use the same connection for all 3 queries). The third query is necessary because connection ids to go back into the pool when you disconnect (i.e. are reused).
C.
In some cases, if you have another identifier of sort such as a UserID, you could filter your query by UniqueID's greater than or equal to mysql_insert_id(), limit by the number of affected rows and only display those by the user. This would really only work inside of a transaction.
$SQL = "INSERT INTO Table
(UserID, Data)
VALUES
(1,'Foo'),
(1,'Bar'),
(1,'FooBar')";
$Result = mysql_query($SQL);
$LastID = mysql_insert_id();
$RowsAffected = mysql_affected_rows();
$IDSQL = "SELECT RecordID
FROM Table
WHERE UserID = 1
AND RecordID >= '$LastID'
LIMIT '$RowsAffected'";
$IDResult = mysql_query($IDSQL);
as a follow up to AngeDeLaMort:
You could seperate your inserts and do it something like this:
$data = array (
array(1,2),
array(3,4),
array(5,6)
);
$ids = array();
foreach ($data as $item) {
$sql = 'insert into table (a,b) values ('.$item[0].','.$item[1].')';
mysql_query ($sql);
$id[] = mysql_insert_id();
}
Now all your new id's are in the $id array.
Maybe I can do this
$insert = "insert into table (a,b) values (1,2),(3,4),(5,6)";
$mysqli->query($insert);
$rows_to_be_inserted=3;
$inserted_id = $mysqli->insert_id // gives me the id of the first row in my list
$last_row_id = ($inserted_id+$rows_to_be_inserted)-1;
$mysql->query("select * from table where id between $inserted_id and $last_row_id");
what to you guys say?