How to Set SQLite primary key

Create table statement: Create Table classinfo (_ id integer primary key, name varchar (20), teacher varchar (20), classroom varchar (20), startweek int, endweek INT ); 

Insert data statement: 

Contentvalues values = new contentvalues ();

Values. Put ("name", (string) classinfo [0]);

Values. Put ("teacher", (string) classinfo [1]);

Values. Put ("classroom", (string) classinfo [2]);

Values. Put ("startweek", (string) classinfo [3]);

Values. Put ("endweek", (string) classinfo [4]);

Dbinfo. insert ("classinfo", null, values );//DbinfoIs the database name, And classinfo is the table name

Key points:

When creating a table, define the ID
Integer primary key,

When inserting,IDNo insert, The effect ID is increased from 1