[sqlite] PRAGMA synchronous = NORMAL and Error = 21

[learning Sqlite3]

Hello,

I use the function:

apr_dbd_query(driver, sqlite3, &nrows, "PRAGMA  synchronous = NORMAL");

But I always get the error and error code is 21. In addtion, rows=(null).

Does it mean I should insert some rows into SQlite3 before I use 
apr_dbd_query()?

Thanks!

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