create a select function for sqlite that takes a opaquepointer and a string statement as parameters. in swift

Here is how you can create a select function for SQLite in Swift that takes an OpaquePointer and a string statement as parameters:

main.swift
import SQLite3

func selectStatement(_ db: OpaquePointer?, query: String) {
    var queryStatement: OpaquePointer?
    
    if sqlite3_prepare_v2(db, query, -1, &queryStatement, nil) == SQLITE_OK {
        while sqlite3_step(queryStatement) == SQLITE_ROW {
            // Handle the results here
        }
    } else {
        print("Query statement could not be prepared")
    }
    
    sqlite3_finalize(queryStatement)
}
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In this function, we first prepare the SQL query using sqlite3_prepare_v2 and then execute it using sqlite3_step. You can handle the results as per your requirements within the loop. Finally, don't forget to finalize the query using sqlite3_finalize.

Remember to properly handle errors and check for return values in a real-world application.