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Started by David L Morris, September 17, 2007, 07:47:15 AM
QuoteInternally, the "fast" query is using sqlite3_prepare() and sqlite3_step until all records are returned when it finally calls sqlite_finalize. The "slow" query is using sqlite3_get_table to get all of the records into memory at one time (this is the approach that I use and most other sqlite database managers use). The benefit is that after the query executes you will know exactly the number of returned rows. Using the other method you will not know the number of rows until you iterate through the entire recordset. A downside of the sqlite3_get_table approach is that the whole recordset is created in memory.... what if your query retruns a billion records? Ouch, I expect that the query would then fail whereas the other approach would continue to work. There are pros and cons with both approaches.