fix: reject queries that contain no SQL statement

[DaveyEke]

sqlite3_prepare_v2 returns SQLITE_OK with a null statement when the query contains no SQL, such as an empty string or nothing but comments. SQLite's own sqlite3_exec guards for it:

if( !pStmt ){
  /* this happens for a comment or white-space */
  zSql = zLeftover;
  continue;
}

prepareStatement only checked the status code. So db.prepare('') returned a statement reporting isFinalized === true before it had ever been used, and db.execute('') reached sqlite3_step with a null statement.

The guard goes in prepareStatement so both paths report the same error.

[vercel]

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Project	Deployment	Actions	Updated
react-native-nitro-sqlite	Ready	Preview	Sep 20, 2026 6:16pm UTC