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This article mainly shows you "FMDB how to use Cached Statement function", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "FMDB how to use Cached Statement function" this article.

FMDB uses the Cached Statement feature

In FMDB, Cached Statement function is a technology to improve SQLite database access. In SQLite, all SQL statements are compiled to form a preprocessing statement Prepared Statements, which is then executed. In SQLite, a proprietary structure, sqlite3_stmt, is provided to hold the Prepared Statements and a series of methods are provided. FMDB encapsulates these to form a class FMStatement that can be called by other classes.

In development, if a large number of SQL statements are executed repeatedly, using this feature can improve App performance. However, if you do not repeat, you can consider turning off this feature to save resources. In FMDB, developers can use the setShouldCacheStatements method to turn the feature on or off, and use the shouldCacheStatements method to determine the status. When you are finished, you can use the clearCachedStatements method to clear the cache.

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