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go存储之CSV
source link: https://blog.51cto.com/u_3764469/5580616
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go存储之CSV
精选 原创CSV格式是一种文本格式，应用比较广泛，可以通过encoding/csv包进行操作。
type Person struct {
Id int
Name string
}
csvFile, err := os.Create("person.csv")
if err != nil {
panic(err)
}
defer csvFile.Close()
allPersons := []Person{
Person{Id: 1, Name: "刘备"},
Person{Id: 2, Name: "关羽"},
Person{Id: 3, Name: "张飞"},
Person{Id: 4, Name: "刘备"},
}
writer := csv.NewWriter(csvFile)
for _, person := range allPersons {
line := []string{
strconv.Itoa(person.Id),
person.Name,
}
err := writer.Write(line)
if err != nil {
panic(err)
}
}
Id int
Name string
}
csvFile, err := os.Create("person.csv")
if err != nil {
panic(err)
}
defer csvFile.Close()
allPersons := []Person{
Person{Id: 1, Name: "刘备"},
Person{Id: 2, Name: "关羽"},
Person{Id: 3, Name: "张飞"},
Person{Id: 4, Name: "刘备"},
}
writer := csv.NewWriter(csvFile)
for _, person := range allPersons {
line := []string{
strconv.Itoa(person.Id),
person.Name,
}
err := writer.Write(line)
if err != nil {
panic(err)
}
}
先用Create方法生成csv文件，allPersons是需要写入文件的数据，NewWriter函数创建一个写入器，并把文件用作参数，将其传递给写入器，最后调用写入器的Write方法，将一系列由字符串组成的切片写入CSV文件。
file, err := os.Open("person.csv")
if err != nil {
panic(err)
}
defer file.Close()
reader := csv.NewReader(file)
reader.FieldsPerRecord = -1
record, err := reader.ReadAll()
if err != nil {
panic(err)
}
var persons []Person
for _, item := range record {
id, _ := strconv.ParseInt(item[0], 0, 0)
person := Person{Id: int(id), Name: item[1]}
persons = append(persons, person)
}
if err != nil {
panic(err)
}
defer file.Close()
reader := csv.NewReader(file)
reader.FieldsPerRecord = -1
record, err := reader.ReadAll()
if err != nil {
panic(err)
}
var persons []Person
for _, item := range record {
id, _ := strconv.ParseInt(item[0], 0, 0)
person := Person{Id: int(id), Name: item[1]}
persons = append(persons, person)
}
先Open打开文件，使用NewReader生成读取器，使用ReadAll方法读取全部记录，返回数据切片，最后循环切片组装数据为Person切片
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