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Demonstration of float scan bug in github.com/go-sql-driver/mysql
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| package main | |
| import ( | |
| "database/sql" | |
| "fmt" | |
| "log" | |
| _ "github.com/go-sql-driver/mysql" | |
| ) | |
| func main() { | |
| db, err := sql.Open("mysql", "root:@tcp(localhost:3306)/float_bug") | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| printRows(db.Query("SELECT id, lat, lon FROM lat_lons WHERE id = 1")) | |
| printRows(db.Query("SELECT id, lat, lon FROM lat_lons WHERE id = ?", 1)) | |
| } | |
| func printRows(rows *sql.Rows, err error) { | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| var ( | |
| id int | |
| lat, lon *float64 | |
| ) | |
| for rows.Next() { | |
| if err = rows.Scan(&id, &lat, &lon); err != nil { | |
| log.Fatal(err) | |
| } | |
| fmt.Println(id, *lat, *lon) | |
| } | |
| rows.Close() | |
| } |
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| DROP TABLE `lat_lons`; | |
| CREATE TABLE `lat_lons` ( | |
| `id` int, | |
| `lat` float, | |
| `lon` float | |
| ); | |
| INSERT INTO `lat_lons` VALUES (1, 33.9534, -117.396); |
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