Android SQLite auto increment

I currently have a table called User which has a id column which is created as

'INTEGER PRIMARY KEY'

Lets say I have created two users so the table has id 1 and 2

If I delete the second user and create a third the id is 2, I need this to be 3

So it seems Android is selecting the next available id, how can I change this to its more like a sequence number?

Regards

Solution 1:

Make it INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL. Here's what the docs say:

If a column has the type INTEGER PRIMARY KEY AUTOINCREMENT then... the ROWID chosen for the new row is at least one larger than the largest ROWID that has ever before existed in that same table.

The behavior implemented by the AUTOINCREMENT keyword is subtly different from the default behavior. With AUTOINCREMENT, rows with automatically selected ROWIDs are guaranteed to have ROWIDs that have never been used before by the same table in the same database. And the automatically generated ROWIDs are guaranteed to be monotonically increasing.

Solution 2:

SQLite AUTOINCREMENT is a keyword used for auto incrementing a value of a field in the table. We can auto increment a field value by using AUTOINCREMENT keyword when creating a table with specific column name to auto incrementing it.

The keyword AUTOINCREMENT can be used with INTEGER field only. Syntax:

The basic usage of AUTOINCREMENT keyword is as follows:

CREATE TABLE table_name(
   column1 INTEGER AUTOINCREMENT,
   column2 datatype,
   column3 datatype,
   .....
   columnN datatype,
);

For Example See Below: Consider COMPANY table to be created as follows:

sqlite> CREATE TABLE TB_COMPANY_INFO(
   ID INTEGER PRIMARY KEY   AUTOINCREMENT,
   NAME           TEXT      NOT NULL,
   AGE            INT       NOT NULL,
   ADDRESS        CHAR(50),
   SALARY         REAL
);

Now, insert following records into table TB_COMPANY_INFO:

INSERT INTO TB_COMPANY_INFO (NAME,AGE,ADDRESS,SALARY)
VALUES ( 'MANOJ KUMAR', 40, 'Meerut,UP,INDIA', 200000.00 );

Now Select the record

SELECT *FROM TB_COMPANY_INFO
    ID      NAME            AGE     ADDRESS             SALARY
    1       Manoj Kumar     40      Meerut,UP,INDIA     200000.00