从一个表导入数据并将其插入到另一个表

Question

I have two tables product_myob and products . What I want to do is to import products from product_myob when the import button is clicked to table products . Table products already contains some products .

I try to execute below query but the table is not updated. Please help me with the code.

INSERT INTO products(myob_id, myob_displayID, Name)
  SELECT UID,displayID,itemName 
  FROM product_myob 
  WHERE UID NOT IN (SELECT myob_id from products);

Answer 1

This is a sample code that you can use. Using MySQLi though because MySQL is deprecated already.

<?php

/* ESTABLISH CONNECTION AND CHANGE THE NECESSARY HOST, USERNAME, PASSWORD AND DATABASE */

$connection=mysqli_connect("YourHost","YourUsername","YourPassword","YourDatabase");

if(mysqli_connect_errno()){

echo "Error".mysqli_connect_error();
}

$result=mysqli_query($connection,"SELECT * FROM product_myob");
while($row=mysqli_fetch_array($result)){

$myobid=mysqli_real_escape_string($con,$row['UID']);
$myobdisplayid=mysqli_real_escape_string($con,$row['displayID']);
$name=mysqli_real_escape_string($con,$row['itemName']);

/* CHECK IF DATA IS ALREADY IN THE products TABLE */

   $result2=mysqli_query($connection,"SELECT * FROM products WHERE myob_id='$myobid' AND myob_displayID='$myobdisplayid' AND Name='$name'");

   if(mysqli_num_rows($result2)==0){

   mysqli_query($connection,"INSERT INTO products (myob_id, myob_displayID, Name) VALUES ('$myobid','$myobdisplayid','$name')");

   } /* END OF IF MYSQLI_NUM_ROWS($RESULT2) IS 0 */

   else {
   echo "Data has already been inserted before.<br>";
   }

} /* END OF WHILE LOOP RESULT */

?>

Answer 2

It seems there is a unique check on your products table and you are inserting some duplicate data if this is the case then you can ignore duplicate values by below query, even you don't need to check UID in product table as this query automatically ignore it. Other wise elaborate your question:

INSERT ignore INTO products(myob_id, myob_displayID, Name)
  (SELECT UID,displayID,itemName 
  FROM product_myob);