Go-sql-driver packet implementation MySQL indefinite field query

Go-sql-driver package is a third party Package /http/github.com/go-sql-driver/mysql directly below the code

Package Mainimport ("Database/sql" "Fmt" _ "Github.com/go-sql-driver/mysql") func main () {//Connect database db, err: = SQL. Open ("MySQL", "Root: @tcp (localhost:3306)/go?charset=utf8") if err! = Nil {fmt. PRINTLN ("Connection database Failed", err.) Error ()) Return}defer db. Close ()//queries the database for query, err: = db. Query ("SELECT * from Go_user") if err! = Nil {fmt. PRINTLN ("Query database Failed", err.) Error ()) Return}defer query. Close ()//read out the Queried column field name Cols, _: = Query. Columns ()//values is the value of each column, which gets into byte values: = Make ([][]byte, Len (cols))//query. Scan parameters, because each query comes out of the column is indefinite, with Len (cols) fixed the length of the query when scans: = Make ([]interface{}, Len (cols))//Let each row of data are populated [][]byte inside for I: = Range values {Scans[i] = &values[i]}//last obtained mapresults: = Make (map[int]map[string]string) I: = 0for query. Next () {//loop, let the cursor push down if err: = Query. Scan (Scans ...); Err! = Nil {//query. The indefinite Long value of the scan query is placed in scans[i] = &values[i], i.e. each line is placed in the values of the FMT. PRINTLN (err) Return}row: = Make (map[string]string)/per line of data for k, V: = range values {//each row of data is placed in values, now move it to row key: = Cols [K]row[key] = string (v)}results[i] = row//loading result setThe i++}//query comes out of the array for k, V: = Range Results {FMT. Println (k, v)}db. Close ()//run out close}

Note: The original is http://www.du52.com/text.php?id=562 I made a comment, so easy to understand point

Go-sql-driver packet implementation MySQL indefinite field query