#ifdef SQLITE_32BIT_ROWID
# define MAX_ROWID 0x7fffffff
#else
/* Some compilers complain about constants of the form 0x7fffffffffffffff.
** Others complain about 0x7ffffffffffffffffLL. The following macro seems
** to provide the constant while making all compilers happy.
*/
# define MAX_ROWID (i64)( (((u64)0x7fffffff)<<32) | (u64)0xffffffff )
#endif
这是sqlite源码中定义的值，自增id即ROWID，最大值即MAX_ROWID
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