[英]Scan row into slice
I want to Scan a sql.Row into a slice like so:我想将 sql.Row 扫描成一个切片,如下所示:
func printRows(rows *sql.Rows){
defer rows.Close()
for rows.Next() {
var row = []interface{}{}
err := rows.Scan(row...)
if err != nil {
log.Fatal(err)
}
r, err := json.Marshal(row)
if err != nil {
log.Fatal(err)
}
log.Println("row:", r);
}
}
but I am getting this error:但我收到此错误:
2020/02/23 20:05:14 raw query: SELECT * FROM user_table LIMIT 500 2020/02/23 20:05:14 sql: expected 6 destination arguments in Scan, not 0 2020/02/23 20:05:14 原始查询:SELECT * FROM user_table LIMIT 500 2020/02/23 20:05:14 sql:扫描中预期有 6 个目的地 arguments,而不是 0
anyone know how to make this generic without using a slice?任何人都知道如何在不使用切片的情况下制作这个通用的?
You can do it this way:你可以这样做:
cols, err := rows.Columns() // Remember to check err afterwards
vals := make([]interface{}, len(cols))
for i, _ := range cols {
vals[i] = new(string)
}
for rows.Next() {
err = rows.Scan(vals...)
}
on the inte.net they say you can use:在 inte.net 上,他们说您可以使用:
vals[i] = new(sql.RawBytes)
instead of代替
vals[i] = new(string)
but I think (string) is fine, idk但我认为 (string) 很好,idk
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