You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: db.xo.go
    path of file: ./repos/xo/_examples/django/oracle
    
    the code of the file until where you have to start completion: package oracle

// Code generated by xo. DO NOT EDIT.

import (
	"context"
	"database/sql"
	"fmt"
	"io"
)

var (
	// logf is used by generated code to log SQL queries.
	logf = func(string,
    
func convLogger(logger interface{}) func(string, ...interface{}) {
	switch z := logger.(type) {
	case io.Writer:
		return func(s string, v ...interface{}) {
			fmt.Fprintf(z, s, v...)
		}
	case func(string, ...interface{}) (int, error): // fmt.Printf
		return func(s string, v ...interface{}) {
			_, _ = z(s, v...)
		}
	case func(string, ...interface{}): // log.Printf
		return z
	}
	panic(fmt.Sprintf("unsupported logger type %T", logger))
}