Add error codes to LibSQLite3::Code

src/sqlite3/lib_sqlite3.cr

@@ -7,9 +7,37 @@ lib LibSQLite3
   type SQLite3Backup = Void*
 
   enum Code
-    OKAY =   0
-    ROW  = 100
-    DONE = 101
+    OKAY       =   0 # Successful result
+    ERROR      =   1 # Generic error
+    INTERNAL   =   2 # Internal logic error in SQLite
+    PERM       =   3 # Access permission denied
+    ABORT      =   4 # Callback routine requested an abort
+    BUSY       =   5 # The database file is locked
+    LOCKED     =   6 # A table in the database is locked
+    NOMEM      =   7 # A malloc() failed
+    READONLY   =   8 # Attempt to write a readonly database
+    INTERRUPT  =   9 # Operation terminated by sqlite3_interrupt()
+    IOERR      =  10 # Some kind of disk I/O error occurred
+    CORRUPT    =  11 # The database disk image is malformed
+    NOTFOUND   =  12 # Unknown opcode in sqlite3_file_control()
+    FULL       =  13 # Insertion failed because database is full
+    CANTOPEN   =  14 # Unable to open the database file
+    PROTOCOL   =  15 # Database lock protocol error
+    EMPTY      =  16 # Internal use only
+    SCHEMA     =  17 # The database schema changed
+    TOOBIG     =  18 # String or BLOB exceeds size limit
+    CONSTRAINT =  19 # Abort due to constraint violation
+    MISMATCH   =  20 # Data type mismatch
+    MISUSE     =  21 # Library used incorrectly
+    NOLFS      =  22 # Uses OS features not supported on host
+    AUTH       =  23 # Authorization denied
+    FORMAT     =  24 # Not used
+    RANGE      =  25 # 2nd parameter to sqlite3_bind out of range
+    NOTADB     =  26 # File opened that is not a database file
+    NOTICE     =  27 # Notifications from sqlite3_log()
+    WARNING    =  28 # Warnings from sqlite3_log()
+    ROW        = 100 # sqlite3_step() has another row ready
+    DONE       = 101 # sqlite3_step() has finished executing
   end
 
   alias Callback = (Void*, Int32, UInt8**, UInt8**) -> Int32