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PHP Tutorials - Setting ID Column as Auto-Incremented

By: FYICenter.com

(Continued from previous topic...)

How To Set the ID Column as Auto-Incremented?

Many tables require an ID column to assign a unique ID number for each row in the table. For example, if you have a table to hold forum member profiles, you need an ID number to identify each member. To allow MySQL server to automatically assign a new ID number for each new record, you can define the ID column with AUTO_INCREMENT and PRIMARY KEY attributes as shown in the following sample script:

<?php
  include "mysql_connection.php";

  $sql = "CREATE TABLE fyi_users ("
      . " id INTEGER NOT NULL AUTO_INCREMENT" 
      . ", name VARCHAR(80) NOT NULL"
      . ", email VARCHAR(80)"
      . ", time TIMESTAMP DEFAULT sysdate()"
      . ", PRIMARY KEY (id)"
      . ")";
  if (mysql_query($sql, $con)) {
    print("Table fyi_links created.\n");
  } else {
    print("Table creation failed.\n");
  }

  mysql_close($con); 
?>

If you run this script, a new table will be created with ID column defined as auto-increment. The sample script below inserts two records with ID values assigned by MySQL server:

<?php
  include "mysql_connection.php";

  $sql = "INSERT INTO fyi_users (name) VALUES ('John King')";
  if (mysql_query($sql, $con)) {
    print(mysql_affected_rows() . " rows inserted.\n");
  } else {
    print("SQL statement failed.\n");
  }
  $sql = "INSERT INTO fyi_users (name) VALUES ('Nancy Greenberg')";
  if (mysql_query($sql, $con)) {
    print(mysql_affected_rows() . " rows inserted.\n");
  } else {
    print("SQL statement failed.\n");
  }

  $sql = "SELECT id, name, time FROM fyi_users";
  $rs = mysql_query($sql, $con);
  while ($row = mysql_fetch_assoc($rs)) {
    print($row['id'].", ".$row['name'].", ".$row['time']."\n");
  }
  mysql_free_result($rs);

  mysql_close($con); 
?>

If you run this script, you will get something like this:

1 rows inserted.
1 rows inserted.
1, John King, 2006-02-26 23:02:39
2, Nancy Greenberg, 2006-02-26 23:02:39

(Continued on next topic...)

1. How To Install MySQL Server?
2. How To Use MySQL Command Line Interface?
3. What Do You Need to Connect PHP to MySQL?
4. How To Connect to MySQL from a PHP Script?
5. How To Create a Database?
6. How To Select an Exiting Database?
7. How To Run a SQL Statement?
8. How To Create a Table?
9. How To Get the Number of Rows Selected or Affected by a SQL Statement?
10. How To Insert Data into a Table?
11. How To Insert Rows Based on SELECT Statements?
12. What Is a Result Set Object?
13. How To Query Tables and Loop through the Returning Rows?
14. How To Update Existing Rows in a Table?
15. How To Delete Existing Rows in a Table?
16. How To Quote Text Values in SQL Statements?
17. How To Quote Date and Time Values in SQL Statements?
18. How To Perform Key Word Search in Tables?
19. How To Query Multiple Tables Jointly?
20. How To Set the ID Column as Auto-Incremented?
21. How To Get the Last ID Assigned by MySQL?