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SQL Server FAQ - PHP ODBC - Creating an Identity Column

By: FYIcenter.com

(Continued from previous topic...)

PHP ODBC - How To Create an Identity Column?

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 SQL Server to automatically assign a new ID number for each new record, you can define the ID column with IDENTITY attribute as shown in the following sample script:

<?php
  $con = odbc_connect('FYI_SQL_SERVER','sa','FYIcenter');

  $sql = "CREATE TABLE fyi_users ("
      . " id INTEGER IDENTITY NOT NULL" 
      . ", name VARCHAR(80) NOT NULL"
      . ", email VARCHAR(80)"
      . ", time DATETIME"
      . ")";
  $res = odbc_exec($con, $sql);
  if (!$res) {
    print("Table creation failed with error:\n");
    print(odbc_error($con).": ".odbc_errormsg($con)."\n");
  } else {
    print("Table fyi_users created.\n");
  }

  odbc_close($con);
?>

If you run this script, a new table will be created with ID column defined as an identity column. It value will be auto-assigned each time a new record is inserted with an auto-incremented number. The sample script below inserts two records with ID values assigned by SQL Server:



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

1, John King,
2, Nancy Greenberg,

  1. PHP ODBC - How To Create a New Table?
  2. PHP ODBC - How To Insert Data into an Existing Table?
  3. PHP ODBC - How To Insert Multiple Rows with a subquery?
  4. PHP ODBC - How To Get the Number of Affected Rows?
  5. PHP ODBC - What Is a Result Set Object Returned by odbc_exec()?
  6. PHP ODBC - How To Loop through Returning Rows?
  7. PHP ODBC - How To Update Existing Rows in a Table?
  8. PHP ODBC - How To Delete Existing Rows in a Table?
  9. PHP ODBC - How To Include Text Values in SQL Statements?
  10. PHP ODBC - How To Include Date and Time Values in SQL Statements?
  11. PHP ODBC - How To Display a Past Time in Days, Hours and Minutes?
  12. PHP ODBC - How To Perform Key Word Search in Tables?
  13. PHP ODBC - How To Query Multiple Tables Jointly?
  14. PHP ODBC - How To Create an Identity Column?

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