go access database demo

package main

import (
    "database/sql"
    "fmt"
    _ "github.com/lib/pq"
    "pricetable"
    "strconv"
    "strings"
)
const (
    FILEPATH    = "D:/test/pricetable/"
    DB_USER     = "xxxxtalog"
    DB_PASSWORD = "xxxx27yeA"
    DB_NAME     = "xxxx7"
    DB_HOST     = "xxxxx.wwwww.com"
    DB_PORT     = ""
)
func main() {

    // for
    callForavx6a()

}
func callForavx6a() {
    //Start
    fmt.Println("# Execute Start !")

    //get model

    //ts := pricetable.GetTable_my_mec_ch_avx6a_prices()
    ts := pricetable.GetTable_my_pmec_ch_avx6a_prices()

    //check file make sure file is new
    pricetable.CheckfileExistAndDelete(FILEPATH, ts.TableName+".sql")

    /*
        //get db connection
        dbinfo := fmt.Sprintf("user=%s password=%s host=%s port=%s dbname=%s sslmode=disable",
            DB_USER, DB_PASSWORD, DB_HOST, DB_PORT, DB_NAME)
        db, err := sql.Open("postgres", dbinfo)
    */

    //get db connection
    dbinfo := fmt.Sprintf("user=%s password=%s host=%s port=%s dbname=%s sslmode=disable",
        DB_USER_N, DB_PASSWORD_N, DB_HOST_N, DB_PORT_N, DB_NAME_N)
    db, err := sql.Open("postgres", dbinfo)

    pricetable.CheckErr(err)
    defer db.Close()

    queryAvx6a(ts, db)

    //Print Execute finished info
    fmt.Println("# Execute End !")
}

func queryAvx6a(ts *pricetable.TableStruct, db *sql.DB) {

    tbname := ts.TableName
    tbcolums := ts.TableColums

    fmt.Println("# Querying")
    //fmt.Println(len(tablecolums))
    for i, v := range tbcolums {

        //test sentence
        if false {
            fmt.Println(i, v)
        }

        //combin query sql
        //qstr := "SELECT  \"model\",\"" + v + "\"  FROM my_" + strings.TrimLeft(tbname, "my_")
        qstr := "SELECT  \"model\",\"" + v + "\"  FROM " + tbname
        fmt.Println(qstr)
        rows, err := db.Query(qstr)
        pricetable.CheckErr(err)

        for rows.Next() {

            var Model_id string
            var val string

            err = rows.Scan(&Model_id, &val)
            pricetable.CheckErr(err)

            if val == "N/A" {
                continue
            }

            var vv string

            f, err := strconv.ParseFloat(val, )

            if err == nil {
                if v == "CE21" {
                    vv = val
                } else {
                    //do float round
                    vv = strconv.FormatFloat(pricetable.MyRound(f, ), 'f', , )

                }

            } else {
                vv = val
            }

            //select * from price_constants
            //filter fields
            vv = pricetable.FilterString(vv)

            //("pid", "unit_name", "model", "refrigerant", "price_option", "y2013", "guid")
            var pixstr string = "insert into " + strings.TrimLeft(tbname, "my_") + "  (\"pid\", \"model\",\"price_option\", \"y2013\") VALUES ("

            contents := pixstr + "(select \"max\"(pid)  from " + strings.TrimLeft(tbname, "my_") + ")" + " ,'" + strings.Trim(Model_id, " ") + "','" + strings.Trim(v, " ") + "','" + vv + "' );\n"

            //test print to console
            //fmt.Println(contents)

            //writer to file
            pricetable.Writertofile(contents, tbname+".sql", FILEPATH)
        }
    }

}

//======================================END==============

//pricetable

package pricetable

type TableStruct struct {
    TableName   string
    TableColums []string
}

func GetTablea() *TableStruct {
    ts := new(TableStruct)
    ts.TableName = "Tablea"
    ts.TableColums = []string{"acolumA", "acolumB"}
    return ts
}

func GetTableb() *TableStruct {
    ts := new(TableStruct)
    ts.TableName = "Tableb"
    ts.TableColums = []string{"bcolumA", "bcolumB"}
    return ts
}

func GetTable_my_dbair2() *TableStruct {
    ts := new(TableStruct)
    ts.TableName = "my_dbair2"
    ts.TableColums = []string{
        "Basic 380-415/3ph/50Hz  (AU )",
        "Basic 460V/3ph/60Hz (Non-UL) (AR )",
        "Drain Pan (Stainless Steel)",
        "Discharge Plenum (Upflow only)",
        "Steam Generating Humidifier",
        "Hot Gas Bypass DX System Only",
        "Liquid Line Solenoid Valve -DX Systems Only (50Hz)",
        "Liquid Line Solenoid Valve -DX Systems Only (60Hz)",
        "Panel Insulation (Insulflex)",
        "Panel Insulation (Double Skin)",
        "SKD (Complete built up unit, piping joints to be brazed by othe",
        "Variable Frequency Drive (VFD) for Evaporator Blower Motor",
        "UnderFloor Water Detector (PinHole Probe)",
        "Smoke Detector",
        "EEV (50Hz/60Hz)",
        "BMS",
        "Low Ambient Kit to 7°C/45F (at design ambient 95F)",
        "Low Ambient Kit to 0°C/32F (at design ambient 95F)",
        "Low Ambient Kit to -10°C/14F (at design ambient 95F)",
        "Low Ambient Kit to 7°C/45F (at design ambient 105F)",
        "Low Ambient Kit to 0°C/32F (at design ambient 105F)",
        "Low Ambient Kit to -10°C/14F (at design ambient 105F)",
        "Coil Fin - Hydrophilic",
        "Coil Fin - Copper",
        "Black Color Epoxy Powder Coating (In lieu of Std Beige Color)  ",
    }

    return ts
}

//====================for ACPSB==================
func Gettable_my_6acpsb_p() *TableStruct {
    ts := new(TableStruct)
    ts.TableName = "my_6ACPSB_P"
    ts.TableColums = []string{
        //"unit_name",
        //"model",
        "basic-R22",
        "basic-R407C",
        "INS0.5",
        "INS1",
        "DWAL",
        "LAC1",
        "SV",
        "HGBP",
        "HWC",
        "DOL1",
        "DOL2",
        "MII",
        "CTLR",
        "ADS-C",
        "ADS-E",
        "HYD-E",
        "HYD-C",
        "SPG",
        "BotR/S",
        "LIGHT",
        "24VAC",
        "SSB",
        "FR",
    }

    return ts
}
}

package pricetable

import (
    "fmt"
    "math"
    "os"
    "strings"
)

//func ContainMap(target string, ranges map[string]string) bool {
//    var flag bool = false
//    for k, _ := range ranges {
//        if k == target {
//            flag = true
//        }
//    }
//    return flag
//}

func ContainArray(target string, ranges []string) bool {
    var flag bool = false
    for _, v := range ranges {
        if v == target {
            flag = true
        }
    }
    return flag
}
func FilterString(feild string) string {

    if strings.Index(feild, "CONSULT xxxxx") != - {
        feild = "-88888"
    }
    if strings.Index(feild, "Contact factory") != - {
        feild = "-88888"
    }
    if strings.Index(feild, "contact xxxx") != - {
        feild = "-88888"
    }

    if strings.Index(feild, "Consult factory") != - {
        feild = "-88888"
    }
    if strings.Index(feild, "Consult xxx") != - {
        feild = "-33333"
    }
    if strings.ToUpper(feild) == "STD" {
        feild = "-66666"
    }
    if strings.ToUpper(feild) == "N/A" {
        feild = "-77777"
    }

    return feild
}

func Exist(filename string) bool {
    _, err := os.Stat(filename)
    return err == nil || os.IsExist(err)
}

func CheckfileExistAndDelete(path string, filename string) {

    if Exist(path + filename) {

        errs := os.Remove(path + filename)
        if errs == nil {
            fmt.Println("delete old file :" + path + filename + " success !")
        } else {
            fmt.Printf("Error: %s\n", errs)
        }
    } else {
        fmt.Println("file:" + path + filename + " not exist,not need to delete !")
    }
}

func Writertofile(content string, filename string, path string) {

    fil, err := os.OpenFile(path+filename, os.O_RDWR|os.O_APPEND, )
    //fmt.Println(path + filename)
    if err != nil {
        //fmt.Printf("Error: %s\n", err)
        filnew, errnew := os.Create(filename)
        if errnew != nil {
            fmt.Printf("Error: %s\n", errnew)
            filnew.Close()
            return
        } else {
            fmt.Println(path + filename + " Create success !")
            fil = filnew
        }

    }
    defer fil.Close()
    fil.WriteString(content)
}

func CheckErr(err error) {
    if err != nil {
        panic(err)
    }
}

func MyRound(f float64, n int) float64 {
    pow10_n := math.Pow10(n)
    return math.Trunc((f+0.5/pow10_n)*pow10_n) / pow10_n
}

//func strings.TrimLeft(" !!! Achtung !!! ", "! ")
func Substr(str string, start, length int) string {
    rs := []rune(str)
    rl := len(rs)
    end := 

    if start <  {
        start = rl -  + start
    }
    end = start + length

    if start > end {
        start, end = end, start
    }

    if start <  {
        start =
    }
    if start > rl {
        start = rl
    }
    if end <  {
        end =
    }
    if end > rl {
        end = rl
    }

    return string(rs[start:end])
}