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Overview
Comment:Documentation update: clarify that sqlite3_errcode() and related interfaces do not themselves modify the error code.
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SHA3-256: 858fc52b237702b5e0381eebf5c158bffd7371ff0053a8583b8c175f8f691c82
User & Date: drh 2018-06-12 19:35:51.264
Context
2018-06-13
02:20
Add the unused SQLITE_CANTOPEN_DIRTYWAL result code. This code was used in some historical versions on the apple-osx branch but was removed by check-in [27e20d699872b2b8]. Restore it so that old code that actually references that result code will still compile. (check-in: 9f40383eed user: drh tags: trunk)
2018-06-12
19:35
Documentation update: clarify that sqlite3_errcode() and related interfaces do not themselves modify the error code. (check-in: 858fc52b23 user: drh tags: trunk)
19:22
Documentation updates: clarify the behavior of sqlite3_column and sqlite3_value interfaces following an OOM error. (check-in: 428c581e4b user: drh tags: trunk)
Changes
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** CAPI3REF: Error Codes And Messages
** METHOD: sqlite3
**
** ^If the most recent sqlite3_* API call associated with 
** [database connection] D failed, then the sqlite3_errcode(D) interface
** returns the numeric [result code] or [extended result code] for that
** API call.
** If the most recent API call was successful,
** then the return value from sqlite3_errcode() is undefined.
** ^The sqlite3_extended_errcode()
** interface is the same except that it always returns the 
** [extended result code] even when extended result codes are
** disabled.
**
** The values returned by sqlite3_errcode() and/or
** sqlite3_extended_errcode() might change with each API call.
** Except, there are some interfaces that are guaranteed to never
** change the value of the error code.  The error-code preserving
** interfaces are:
**
** <ul>
** <li> sqlite3_errcode()
** <li> sqlite3_extended_errcode()
** <li> sqlite3_errmsg()
** <li> sqlite3_errmsg16()
** </ul>
**
** ^The sqlite3_errmsg() and sqlite3_errmsg16() return English-language
** text that describes the error, as either UTF-8 or UTF-16 respectively.
** ^(Memory to hold the error message string is managed internally.
** The application does not need to worry about freeing the result.
** However, the error string might be overwritten or deallocated by
** subsequent calls to other SQLite interface functions.)^
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