golang mysql string <-> id mapper

This lib depends on github.com/go-sql-driver/mysql
Example

package main

import (
    "fmt"
    "github.com/hongjundu/go-mysql-string-id-mapper"
)

func main() {
    if err := idmapper.Init("root:123456@/mydb?charset=utf8&loc=Local", "mydb"); err != nil {
        fmt.Printf("error: %+v", err)
    }

    m := idmapper.GetIdMapper("name", true)

    count := 20

    c := make(chan bool, count)

    for i := 0; i < count; i++ {
        name := fmt.Sprintf("name_%d", i+1)
        go func() {
            id := m.IdFromItem(name, true)
            fmt.Printf("new id for string item %s: %d\n", name, id)
            c <- true
        }()
    }

    // wait all routines done
    for i := 0; i < count; i++ {
        <-c
    }

    fmt.Println()
    fmt.Printf("all string items: %+v\n", m.Items())
    fmt.Println()

    for i := 0; i < count; i++ {
        name := fmt.Sprintf("name_%d", i+1)
        id := m.IdFromItem(name, false)
        fmt.Printf("existing id for string item %s: %d\n", name, id)
    }
    fmt.Println()

    for i := 0; i < count; i++ {
        id := uint32(i + 1)
        item, has := m.ItemFromId(id)
        fmt.Printf("id: %d item: %s has: %v\n", id, item, has)
    }
    fmt.Println()
}