在 SQLite C API 中使用 sqlite3_data_count() 而不是 sqlite3_column_count() 有什么好处?

2021-11-15 00:00:00 api c sqlite

阅读文档后,似乎函数 sqlite3_column_count 做的都是一样的,但没有 sqlite3_data_count 的限制.

After reading the docs, it seems the the function sqlite3_column_count does all the same, but doesn't have the restrictions that sqlite3_data_count has.

为什么我要使用 sqlite3_data_count 而不是 sqlite3_column_count?谢谢!

Why would I ever want to use sqlite3_data_count over sqlite3_column_count? thanks!

推荐答案

sqlite3_data_count 返回当前执行语句的值(列)数.没有结果则返回 0.

sqlite3_data_count returns the number of values (columns) of the currently executing statement. With no results it returns 0.

sqlite3_column_count 另一方面,总是返回列数,有或没有结果.

sqlite3_column_count on the other hand, returns always the number of columns, with or without results.

您将使用哪一个取决于您是否必须获取列数.

Which one you'll use depends on whether you must get the number of columns or not.

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