Dec 20, 2010

How Salesforce 18 Digit Id Is Calculated

Hi All,

As we know that each record Id represents a unique record within an organisation. There are two versions of every record Id in salesforce :

  • 15 digit case-sensitive version which is referenced in the UI
  • 18 digit case-insensitive version which is referenced through the API
The last 3 digits of the 18 digit ID are a checksum of the capitalizations of the first 15 characters, this ID length was created as a workaround to legacy systems which were not compatible with case-sensitive IDs.
The API will accept the 15 digit ID as input but will always return the 18 digit ID.

Now how we can calculate the 18 Digit Id from 15 Digit Id :

//Our 15 Digit Id
String id = '00570000001ZwTi' ;

string suffix = '';
integer flags;

for (integer i = 0; i < 3; i++) {
          flags = 0;
          for (integer j = 0; j < 5; j++) {
               string c = id.substring(i * 5 + j,i * 5 + j + 1);
               //Only add to flags if c is an uppercase letter:
               if (c.toUpperCase().equals(c) && c >= 'A' && c <= 'Z') {
                    flags = flags + (1 << j);
               }
          }
          if (flags <= 25) {
               suffix = suffix + 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.substring(flags,flags+1);
          }else{
               suffix = suffix + '012345'.substring(flags-25,flags-24);
          }
     }

//18 Digit Id with checksum
System.debug(' ::::::: ' + id + suffix) ;


Thanks

6 comments:

  1. so are salesforce creators are so stupid that they can't include your code as standart function somewhere?

    ReplyDelete
  2. There is a bug in this algorithm:
    suffix = suffix + '012345'.substring(flags-25,flags-24);
    Correct version:
    suffix += '012345'.substring(flags - 26, flags-25);

    ReplyDelete
  3. I suggest implementing a 15-to-18-character ID converter through a formula field. No code needed! http://tinyurl.com/15CharFix

    Id &
    MID(
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ012345",
    MIN(FIND(MID(Id, 5, 1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ"), 1) * 16 +
    MIN(FIND(MID(Id, 4, 1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ"), 1) * 8 +
    MIN(FIND(MID(Id, 3, 1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ"), 1) * 4 +
    MIN(FIND(MID(Id, 2, 1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ"), 1) * 2 +
    MIN(FIND(MID(Id, 1, 1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ"), 1) * 1 + 1,
    1) &
    MID(
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ012345",
    MIN(FIND(MID(Id, 10, 1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ"), 1) * 16 +
    MIN(FIND(MID(Id, 9, 1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ"), 1) * 8 +
    MIN(FIND(MID(Id, 8, 1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ"), 1) * 4 +
    MIN(FIND(MID(Id, 7, 1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ"), 1) * 2 +
    MIN(FIND(MID(Id, 6, 1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ"), 1) * 1 + 1,
    1) &
    MID(
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ012345",
    MIN(FIND(MID(Id, 15, 1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ"), 1) * 16 +
    MIN(FIND(MID(Id, 14, 1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ"), 1) * 8 +
    MIN(FIND(MID(Id, 13, 1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ"), 1) * 4 +
    MIN(FIND(MID(Id, 12, 1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ"), 1) * 2 +
    MIN(FIND(MID(Id, 11, 1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ"), 1) * 1 + 1,
    1)

    ReplyDelete
  4. This comment has been removed by the author.

    ReplyDelete
  5. You can use CASESAFEID() in salsforce to generate a case insensitive id

    ReplyDelete
  6. I want to validate postal code using controller validation how do I do it?
    I'm new to salesforce.
    postal code: data type(Number(4,0))

    ReplyDelete