I have PHP script that runs every 3 hours that gets the amazon mws orders and save it into my database.
But before I insert an order into my table, I check first if the order exist
SELECT COUNT(*) total FROM orders WHERE transaction_id = "XXXXXXXXX"
But sometimes even if an order exist, the query will return 0. If return 0, I will insert the order into my table and it will end up duplicating the data.
This instance happens to me in my other PHP scripts and I don't understand the issue.
You should use something called as EXISTS for checking whether a row exists or not in your case order.
SELECT EXISTS(SELECT * FROM table1 WHERE ...);
SELECT EXISTS(SELECT * FROM tableName WHERE condition);
If your database uses master-slave mode,you can try to force the master to query.
You can also use the “INSERT IGNORE INTO orders ....” to ignore duplicate.
You may have an error in your MySQL query. I created a test table and write some code to print the result of the query which is working correctly.
You may not be using the quotations properly as this is the error most
of the time when you are working with queries in PHP
Here is the code
<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "practise";
// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) {
die("Connection failed: " . mysqli_connect_errno());
}
$sql = "SELECT count(*) from test where title='Hello'";
$result = mysqli_query($conn,$sql);
$new =mysqli_fetch_array($result);
echo $new[0];
?>
</body>
</html>
And:
Image of the table where I am executing the query
The output against the MySQL query is:
2
The code works perfectly. If you have any other question, please share your code and I'll be more than happy to help you.
I need to say that I'm a beginner on php, mysqli, but I want to learn.
I am trying to build an quiz script which store "SCORE" information into database.
I have the following "final.php" page script, which collects and inserts into the database, the current score of user.
What I need is that I want to keep the current score from database "eg: 213", and increase with current session score which will be "eg :10", so total score after that will be "213(old) + 10(current) = 223(total)
<?php
$servername = "localhost";
$username = "";
$password = "";
$dbname = "";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "UPDATE users SET scor='".$_SESSION['score']."' WHERE id=2";
if ($conn->query($sql) === TRUE) {
echo "Record updated successfully";
} else {
echo "Error updating record: " . $conn->error;
}
$conn->close();
?>
Everything working fine with that code, but all what I need is that to increase score.
Thank you to everyone for you patience and because you understand me that I am beginner.
You can update the existing value in the database by adding your amount to it. There is no need to select the score first.
So in your example:
UPDATE users SET scor=scor + '".$_SESSION['score']."' WHERE id=2
This can be exploited by sql injection, but its out of the scope of the question.
you can use the following statement
$sql = "SELECT scor FROM users (UPDATE users SET scor= scor + '".$_SESSION['score']."' WHERE id=2)";
I'm trying to finish a script that connects to two databases, each on a different server, and preforms an update. Basically, the tables being selected from and inserted to are identical: I did a dump/import the other day. The script needs to keep my local table up to date from the remote once since there will be daily records inserted into the remote one and I need to keep it up to date locally.
The key here is that I'm determining the new rows on the remote server by looking at the Auto-incremented Primary key that the tables share, SESSIONID . I'm trying to get my loop below to say, if the id exists in remote server and not local, then insert those records in local server.
I run the below script in powershell by typing php 'filename', and I get both of my successful connection messages, and then I get this message: Incorrect datetime value: '' for column 'ALERTINGTIMESTAMP' at row 1. In this record it's trying to insert, the datetime value is NULL, which the table allows for, however I'm worried it's an issue with escaping characters or something.
How can I modify this to escape properly, or get these records inserted.
Note: Replication and large dump/import/table recreations are not an option for us in this situation. We have several similar scripts to this running and we want to keep the same process here. I'm merely looking to resolve these errors or have someone give me a more efficient way of coding this script, perhaps using a max id or something along those lines.
Here's the script:
ini_set('memory_limit', '256M');
// Create connection
$conn = new mysqli($servername, $username, $password);
$conn2 = new mysqli($servername2, $username2, $password2);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";
// Check connection2
if ($conn2->connect_error) {
die("Connection failed: " . $conn2->connect_error);
}
echo "Connected successfully";
$latest_result = $conn2->query("SELECT MAX(`SESSIONID`) FROM `ambition`.`session`");
$latest_row = $latest_result->fetch_row();
$latest_session_id = $latest_row[0];
//Select All rows from the source phone database
$source_data = mysqli_query($conn, "SELECT * FROM `cdrdb`.`session` WHERE `SESSIONID` > $latest_session_id");
// Loop on the results
while($source_item = $source_data->fetch_assoc()) {
// Check if row exists in destination phone database
$row_exists = $conn2->query("SELECT SESSIONID FROM ambition.session WHERE SESSIONID = '".$source_item['SESSIONID']."' ") or die(mysqli_error($conn2));
//if query returns false, rows don't exist with that new ID.
if ($row_exists->num_rows == 0){
//Insert new rows into ambition.session
$conn2->query("INSERT INTO ambition.session (SESSIONID,SESSIONTYPE,CALLINGPARTYNO,FINALLYCALLEDPARTYNO,DIALPLANNAME,TERMINATIONREASONCODE,ISCLEARINGLEGORIGINATING,CREATIONTIMESTAMP,ALERTINGTIMESTAMP,CONNECTTIMESTAMP,DISCONNECTTIMESTAMP,HOLDTIMESECS,LEGTYPE1,LEGTYPE2,INTERNALPARTYTYPE1,INTERNALPARTYTYPE2,SERVICETYPEID1,SERVICETYPEID2,EXTENSIONID1,EXTENSIONID2,LOCATION1,LOCATION2,TRUNKGROUPNAME1,TRUNKGROUPNAME2,SESSIONIDTRANSFEREDFROM,SESSIONIDTRANSFEREDTO,ISTRANSFERINITIATEDBYLEG1,SERVICEEXTENSION1,SERVICEEXTENSION2,SERVICENAME1,SERVICENAME2,MISSEDUSERID2,ISEMERGENCYCALL,NOTABLECALLID,RESPONSIBLEUSEREXTENSIONID,ORIGINALLYCALLEDPARTYNO,ACCOUNTCODE,ACCOUNTCLIENT,ORIGINATINGLEGID,SYSTEMRESTARTNO,PATTERN,HOLDCOUNT,AUXSESSIONTYPE,DEVICEID1,DEVICEID2,ISLEG1ORIGINATING,ISLEG2ORIGINATING,GLOBALCALLID,CADTEMPLATEID,CADTEMPLATEID2,ts,INITIATOR,ACCOUNTNAME,APPNAME,CALLID,CHRTYPE,CALLERNAME,serviceid1,serviceid2)
VALUES ('".$source['SESSIONID']."' ,
'".$source['SESSIONTYPE']."' ,
'".$source['CALLINGPARTYNO']."' ,
'".$source['FINALLYCALLEDPARTYNO']."',
'".$source['DIALPLANNAME']."',
'".$source['TERMINATIONREASONCODE']."',
'".$source['ISCLEARINGLEGORIGINATING']."',
'".$source['CREATIONTIMESTAMP']."',
'".$source['ALERTINGTIMESTAMP']."',
'".$source['CONNECTTIMESTAMP']."',
'".$source['DISCONNECTTIMESTAMP']."',
'".$source['HOLDTIMESECS']."',
'".$source['LEGTYPE1']."',
'".$source['LEGTYPE2']."',
'".$source['INTERNALPARTYTYPE1']."',
'".$source['INTERNALPARTYTYPE2']."',
'".$source['SERVICETYPEID1']."',
'".$source['SERVICETYPEID2']."',
'".$source['EXTENSIONID1']."',
'".$source['EXTENSIONID2']."',
'".$source['LOCATION1']."',
'".$source['LOCATION2']."',
'".$source['TRUNKGROUPNAME1']."',
'".$source['TRUNKGROUPNAME2']."',
'".$source['SESSIONIDTRANSFEREDFROM']."',
'".$source['SESSIONIDTRANSFEREDTO']."',
'".$source['ISTRANSFERINITIATEDBYLEG1']."',
'".$source['SERVICEEXTENSION1']."',
'".$source['SERVICEEXTENSION2']."',
'".$source['SERVICENAME1']."',
'".$source['SERVICENAME2']."',
'".$source['MISSEDUSERID2']."',
'".$source['ISEMERGENCYCALL']."',
'".$source['NOTABLECALLID']."',
'".$source['RESPONSIBLEUSEREXTENSIONID']."',
'".$source['ORIGINALLYCALLEDPARTYNO']."',
'".$source['ACCOUNTCODE']."',
'".$source['ACCOUNTCLIENT']."',
'".$source['ORIGINATINGLEGID']."',
'".$source['SYSTEMRESTARTNO']."',
'".$source['PATTERN']."',
'".$source['HOLDCOUNT']."',
'".$source['AUXSESSIONTYPE']."',
'".$source['DEVICEID1']."',
'".$source['DEVICEID2']."',
'".$source['ISLEG1ORIGINATING']."',
'".$source['ISLEG2ORIGINATING']."',
'".$source['GLOBALCALLID']."',
'".$source['CADTEMPLATEID']."',
'".$source['CADTEMPLATEID2']."',
'".$source['ts']."',
'".$source['INITIATOR']."',
'".$source['ACCOUNTNAME']."',
'".$source['APPNAME']."',
'".$source['CALLID']."',
'".$source['CHRTYPE']."',
'".$source['CALLERNAME']."',
'".$source['serviceid1']."',
'".$source['serviceid2']."')");
}
}
Like Pankaj said, try something like this:
//Insert new rows into ambition.session
$statement = $conn2->prepare('INSERT INTO ambition.session (SESSIONID,SESSIONTYPE,CALLINGPARTYNO,FINALLYCALLEDPARTYNO,DIALPLANNAME,TERMINATIONREASONCODE,ISCLEARINGLEGORIGINATING,CREATIONTIMESTAMP,ALERTINGTIMESTAMP,CONNECTTIMESTAMP,DISCONNECTTIMESTAMP,HOLDTIMESECS,LEGTYPE1,LEGTYPE2,INTERNALPARTYTYPE1,INTERNALPARTYTYPE2,SERVICETYPEID1,SERVICETYPEID2,EXTENSIONID1,EXTENSIONID2,LOCATION1,LOCATION2,TRUNKGROUPNAME1,TRUNKGROUPNAME2,SESSIONIDTRANSFEREDFROM,SESSIONIDTRANSFEREDTO,ISTRANSFERINITIATEDBYLEG1,SERVICEEXTENSION1,SERVICEEXTENSION2,SERVICENAME1,SERVICENAME2,MISSEDUSERID2,ISEMERGENCYCALL,NOTABLECALLID,RESPONSIBLEUSEREXTENSIONID,ORIGINALLYCALLEDPARTYNO,ACCOUNTCODE,ACCOUNTCLIENT,ORIGINATINGLEGID,SYSTEMRESTARTNO,PATTERN,HOLDCOUNT,AUXSESSIONTYPE,DEVICEID1,DEVICEID2,ISLEG1ORIGINATING,ISLEG2ORIGINATING,GLOBALCALLID,CADTEMPLATEID,CADTEMPLATEID2,ts,INITIATOR,ACCOUNTNAME,APPNAME,CALLID,CHRTYPE,CALLERNAME,serviceid1,serviceid2)
VALUES (?, ?, ?, ...);');
$statement->bindParam(1, $source['SESSIONID']);
$statement->bindParam(2, $source['SESSIONTYPE']);
$statement->bindParam(3, $source['CALLINGPARTYNO']);
//...
$statement->execute();
You have to use prepare() function to use parameterized query. Here I have taken example of your query with few parameters you can add yourself with other variables.
$stmt = $conn2->prepare("INSERT INTO ambition.session (SESSIONID,SESSIONTYPE,CALLINGPARTYNO,FINALLYCALLEDPARTYNO) VALUES (:SESSIONID ,:SESSIONTYPE ,:CALLINGPARTYNO ,:FINALLYCALLEDPARTYNO)");
$stmt->bindParam(':SESSIONID', $source['SESSIONID']);
$stmt->bindParam(':SESSIONTYPE', $source['SESSIONTYPE']);
$stmt->bindParam(':CALLINGPARTYNO', $source['CALLINGPARTYNO']);
$stmt->bindParam(':FINALLYCALLEDPARTYNO', $source['FINALLYCALLEDPARTYNO']);
$stmt->execute();
You can checkout this link for more understanding. http://php.net/manual/en/mysqli.prepare.php
I am trying to learn php from W3schools which includes a mysql section.So far I have completed every other part of the tutorial on w3school except the part that prints content from a database table. For some very weird reason , nothing displays when I run my code. Please how can I get this working and could my problem come from the fact that I am using MariaDB with Xampp instead of Mysql although they said it was practically the same syntax.
Here is the code
<?php
$servername = "localhost";
$username = "uhexos";
$password = "strongpassword";
$database = "fruitdb";
// Create connection
$conn = new mysqli($servername, $username, $password);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
// Create database
$sql = "CREATE DATABASE fruitDB";
if ($conn->query($sql) === TRUE) {
echo "Database created successfully";
} else {
echo "Error creating database: " . $conn->error;
}
$conn->close();
// Create connection
$conn = mysqli_connect($servername, $username, $password,$database);
// sql to create table
$complexquery = "CREATE TABLE MyFruits (
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
FruitType VARCHAR(30) NOT NULL,
FruitTaste VARCHAR(30) NOT NULL,
FruitQuantity INT NOT NULL,
DatePurchased TIMESTAMP
)";
if ($conn->query($complexquery) === TRUE) {
echo "Table Fruits created successfully<br> ";
} else {
echo "Error creating table: " . $conn->error;
}
$entry = "INSERT INTO myfruits (fruittype,fruittaste,fruitquantity) VALUES ('orange','sweet','50'),('lemon','sour','10'),('banana','sweet','15')";
if ($conn->query($entry) === TRUE) {
echo "New records created successfully";
} else {
echo "Error: " . $conn->error;
}
$sql = 'SELECT id, fruitname, fruittaste FROM myfruits';
$retval = mysql_query( $sql, $conn );
if(! $retval ) {
die('Could not get data: ' . mysql_error());
}
while($row = mysql_fetch_array($retval, MYSQL_ASSOC)) {
echo "EMP ID :{$row['id']} <br> ".
"EMP NAME : {$row['fruitname']} <br> ".
"EMP SALARY : {$row['fruittaste']} <br> ".
"--------------------------------<br>";
}
echo "Fetched data successfully\n";
mysql_close($conn);
?>
this is the output I get from all my echos.
Error creating database: Can't create database 'fruitdb'; database existsError creating table: Table 'myfruits' already existsNew records created successfully
or
Database created successfullyTable Fruits created successfully
New records created successfully
Based on the error message, you managed to create the database and tables once and now each time you run the code it fails because you can't reuse the names.
You definitely don't want to have code trying to erase & start fresh on your database every time. In fact, most often I find that you don't even create the database inside your regular code but use phpMyAdmin or some other admin page to do that. But creating tables inside code is normal enough. Two options:
1 - Create the table only if it does not already exist. This is extremely safe. However, if you want to start a table over again with a new structure, or start with it always empty, that won't work. To do that, just change CREATE TABLE to CREATE TABLE IF NOT EXISTS
2 - Delete the table before creating it. Before each CREATE TABLE command, add a command like DELETE TABLE IF EXISTS MyFruits
Remember database name is Case-insensitive, so it doesn't matter whether you create a DB name "fruitdb" or "fruitDb" both are same.That is the reason you are getting error. Also you don't have to create a new database when you execute any file. If you have already created the database than you only have make the connection with it.
Let's debug your code line by line.
Line 8 -
// Create connection
$conn = new mysqli($servername, $username, $password);
Here you are creating the connection with your database because you have already created that database. If you check your phpmyadmin, you'll find a database named "fruitdb"
Line 10 -
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
Here your checking whether the you are able to connect with your database. If not it will throw the error and your script will stop. Right now your code successfully runs till this point.
Line 15 -
// Create database
$sql = "CREATE DATABASE fruitDB";
Here you are again creating a database with same name and your code stops working as you already have it.
The error was from this line
$sql = 'SELECT id, fruitname, fruittaste FROM myfruits';
I accidentally put fruitname instead of fruittype and that is what caused it to fail. So for anyone else with thi problem my advice is to check your variable names if you are 100% sure of your syntax. Thanks for all the help.