struct slice

type ExampleStruct struct {
    Name  string
    Value string
}

type ExampleStructSlice []ExampleStruct

func (l ExampleStructSlice) Value() (driver.Value, error) {
    bytes, err := json.Marshal(l)
    return string(bytes), err
}

func (l *ExampleStructSlice) Scan(input interface{}) error {
    switch value := input.(type) {
    case string:
        return json.Unmarshal([]byte(value), l)
    case []byte:
        return json.Unmarshal(value, l)
    default:
        return errors.New("not supported")
    }
}

字符串slice

type ExampleStringSlice []string

func (l ExampleStringSlice) Value() (driver.Value, error) {
    bytes, err := json.Marshal(l)
    return string(bytes), err
}

func (l *ExampleStringSlice) Scan(input interface{}) error {
    switch value := input.(type) {
    case string:
        return json.Unmarshal([]byte(value), l)
    case []byte:
        return json.Unmarshal(value, l)
    default:
        return errors.New("not supported")
    }
}

代码参考：github.com/jinzhu/gorm@v1.9.12/scaner_test.go

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