Pointers 在结构片上循环并更新值
我从源A获取数据,并将其存储在结构片中,如下所示:Pointers 在结构片上循环并更新值,pointers,go,struct,slice,Pointers,Go,Struct,Slice,我从源A获取数据,并将其存储在结构片中,如下所示: type ProductPrice struct { Type string Sku string UnitPrice string PriceList string standardPrice string specialPrice string specialStart string specialEnd stri
type ProductPrice struct {
Type string
Sku string
UnitPrice string
PriceList string
standardPrice string
specialPrice string
specialStart string
specialEnd string
pricingUnit string
categoryCode string
isOnSpecial bool
}
func getProductPricesFromDatabase(instance string) []ProductPrice {
rows, err := myDBConnection.Query(// My query here)
if err != nil {
log.Fatal("There was an issue with the query for product price: ", err)
}
defer rows.Close()
var productPrices []ProductPrice
for rows.Next() {
var product = ProductPrice{}
err := rows.Scan(
&product.Type,
&product.Sku,
&product.standardPrice,
&product.specialPrice,
&product.specialStart,
&product.specialEnd,
&product.pricingUnit,
&product.PriceList,
&product.categoryCode,
)
if err != nil {
log.Fatal("product price scan error: ", err)
}
productPrices = append(productPrices, product)
}
return productPrices
}
type ContractProductPrice struct {
CustID string
PriceBy string
AppliesTo string
PriceList string
StartDate string
EndDate string
PricingAdjustmentType string
PricingAdjustmentValue string
UseLowest string
}
func getContractProductPricesFromDatabase(instance string) []ContractProductPrice {
rows, err := myDBConnection.Query(// My query here)
if err != nil {
log.Fatal("There was an issue with the query for contract product price: ", err)
}
defer rows.Close()
var contractProductPrices []ContractProductPrice
for rows.Next() {
var product = ContractProductPrice{}
err := rows.Scan(
&product.CustID,
&product.PriceBy,
&product.AppliesTo,
&product.PriceList,
&product.StartDate,
&product.EndDate,
&product.PricingAdjustmentType,
&product.PricingAdjustmentValue,
&product.UseLowest,
)
if err != nil {
log.Fatal("contract product price scan error: ", err)
}
contractProductPrices = append(contractProductPrices, product)
}
return contractProductPrices
}
然后,我从源B获取一些数据,并将其存储在结构片中,如下所示:
type ProductPrice struct {
Type string
Sku string
UnitPrice string
PriceList string
standardPrice string
specialPrice string
specialStart string
specialEnd string
pricingUnit string
categoryCode string
isOnSpecial bool
}
func getProductPricesFromDatabase(instance string) []ProductPrice {
rows, err := myDBConnection.Query(// My query here)
if err != nil {
log.Fatal("There was an issue with the query for product price: ", err)
}
defer rows.Close()
var productPrices []ProductPrice
for rows.Next() {
var product = ProductPrice{}
err := rows.Scan(
&product.Type,
&product.Sku,
&product.standardPrice,
&product.specialPrice,
&product.specialStart,
&product.specialEnd,
&product.pricingUnit,
&product.PriceList,
&product.categoryCode,
)
if err != nil {
log.Fatal("product price scan error: ", err)
}
productPrices = append(productPrices, product)
}
return productPrices
}
type ContractProductPrice struct {
CustID string
PriceBy string
AppliesTo string
PriceList string
StartDate string
EndDate string
PricingAdjustmentType string
PricingAdjustmentValue string
UseLowest string
}
func getContractProductPricesFromDatabase(instance string) []ContractProductPrice {
rows, err := myDBConnection.Query(// My query here)
if err != nil {
log.Fatal("There was an issue with the query for contract product price: ", err)
}
defer rows.Close()
var contractProductPrices []ContractProductPrice
for rows.Next() {
var product = ContractProductPrice{}
err := rows.Scan(
&product.CustID,
&product.PriceBy,
&product.AppliesTo,
&product.PriceList,
&product.StartDate,
&product.EndDate,
&product.PricingAdjustmentType,
&product.PricingAdjustmentValue,
&product.UseLowest,
)
if err != nil {
log.Fatal("contract product price scan error: ", err)
}
contractProductPrices = append(contractProductPrices, product)
}
return contractProductPrices
}
从源B获取数据后,我想用源B中的一些数据更新源A中的结构片
productPrices := getProductPricesFromDatabase(instance)
contractProductPrices := getContractProductPricesFromDatabase(instance)
processedProductPrices := processProductPricesFromDatabase(productPrices, contractProductPrices)
func processProductPricesFromDatabase(productPrices []ProductPrice, contractProductPrices []ContractProductPrice) []ProductPrice {
// Loop over contact prices and update relevant product prices
for _, contractPrice := range contractProductPrices {
for _, product := range productPrices {
if contractPrice.AppliesTo == product.Sku {
product.UnitPrice = contractPrice.PricingAdjustmentValue
}
}
}
return productPrices
}
但是,在此运行之后,processedProductPrices
中的单价仍然为空
从我的搜索中,我了解了问题所在;Go通过值传递,因此我不会更新原始内存地址,因此值不会更改。
然而,我不明白/不知道我需要修改什么来解决这个问题,因为我使用的是一个结构片,而不是一个简单的数字/字符串片示例
如何更新
productPrices
,以便在返回时,processedProductPrices
等于更新后的productPrices
结构切片?在处理需要修改的值时,至少在我看来,最好使用指针。他们会让你的生活更轻松
因此,不是:
func getProductPricesFromDatabase(instance string) []ProductPrice {
// ...
var productPrices []ProductPrice
for rows.Next() {
var product = ProductPrice{}
// ...
}
return productPrices
}
我建议您重构代码,以便:
func getProductPricesFromDatabase(instance string) []*ProductPrice {
// ...
var productPrices []*ProductPrice
for rows.Next() {
var product = new(ProductPrice)
// ...
}
return productPrices
}
现在对getContractProductPricesFromDatabase
执行相同的操作,最后将参数类型更新为processProductPricesFromDatabase
函数:
func processProductPricesFromDatabase(productPrices []*ProductPrice, contractProductPrices []*ContractProductPrice) []*ProductPrice {
// Loop over contact prices and update relevant product prices
for _, contractPrice := range contractProductPrices {
for _, product := range productPrices {
if contractPrice.AppliesTo == product.Sku {
product.UnitPrice = contractPrice.PricingAdjustmentValue
}
}
}
return productPrices
}
另一种选择是,如果希望继续使用非指针类型,可以通过索引到切片中来直接修改切片引用的值
func processProductPricesFromDatabase(productPrices []ProductPrice, contractProductPrices []ContractProductPrice) []ProductPrice {
// Loop over contact prices and update relevant product prices
for _, contractPrice := range contractProductPrices {
for i, _ := range productPrices {
if contractPrice.AppliesTo == productPrices[i].Sku {
productPrices[i].UnitPrice = contractPrice.PricingAdjustmentValue
}
}
}
return productPrices
}
您需要循环使用
[]*ProductPrice
,即指针,以便能够修改它们,否则您在循环中看到的是您已经知道的每个切片元素的副本。或者使用索引productPrices[i]。单价=…
@mkopriva您能给我举个例子吗?我不知道如何按照你的建议进行重构?或者@mkopriva您的评论属于答案。谢谢您的指导!工作完美。