Question

在你告诉我阅读docs之前，是的，我已经阅读了它们。但是我自己的测试告诉我，我有时可以在一些准备好的语句中反复调用sqlite3_step()而不先重置它们。例如：BEGIN和COMMIT。当我需要重置预先准备好的声明时，您是否可以解释一下，因为我希望尽可能避免拨打电话？

编辑：文档说（我的大胆）：

准备好的陈述对象通常的生命周期如下：

Answer 1

来自sqlite来源：

/* We used to require that sqlite3_reset() be called before retrying
** sqlite3_step() after any error or after SQLITE_DONE.  But beginning
** with version 3.7.0, we changed this so that sqlite3_reset() would
** be called automatically instead of throwing the SQLITE_MISUSE error.
** This "automatic-reset" change is not technically an incompatibility, 
** since any application that receives an SQLITE_MISUSE is broken by
** definition.
**
** Nevertheless, some published applications that were originally written
** for version 3.6.23 or earlier do in fact depend on SQLITE_MISUSE 
** returns, and those were broken by the automatic-reset change.  As a
** a work-around, the SQLITE_OMIT_AUTORESET compile-time restores the
** legacy behavior of returning SQLITE_MISUSE for cases where the 
** previous sqlite3_step() returned something other than a SQLITE_LOCKED
** or SQLITE_BUSY error.
*/

因此，对于版本3.7.0，如果您达到SQLITE_DONE并且想要再次执行，则不需要sqlite_reset。

完成后，您需要调用sqlite3_finalize来释放该语句。查看https://www.sqlite.org/c3ref/finalize.html

Answer 2

我偶然发现，没有重置语句的另一个问题是，在重置准备好的语句之前，数据库可能保持锁定状态。例如。 sqlite3_wal_checkpoint（）将返回SQL_LOCKED。

sqlite3_reset（）何时需要？

2 个答案: