Android Sqlite3 database: Cursor in SQLite is not returning null? -

could advise me why getting true result, though record not exist in database?

for clarification, in table, _id telephone number.

here's code:

public boolean checkifexists(string number){     string[] columns = new string[]{"_id"};     string[] wehreargs = new string[]{number};     this.opendatabase();     if (mydatabase.query("mytable", columns, "_id=?", wehreargs, null, null, null)==null){         mydatabase.query("mytable", columns, "_id=?", wehreargs, null, null, null).close();         this.close();     return false;     } else {         mydatabase.query("mytable", columns, "_id=?", wehreargs, null, null, null).close();         this.close();         return true;     } } 

as @dougcurrie mentions: query returning non-null cursors only: revised code:

public boolean checkifexists(string number){     string[] columns = new string[]{"_id"};     string[] wehreargs = new string[]{number};     this.opendatabase();     cursor c = mydatabase.query("mytable", columns, "_id=?", wehreargs, null, null, null)     boolean hasentry = c.movetofirst()     c.close();     this.close()     return hasentry; }