mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-05 05:52:05 +00:00
93 lines
1.9 KiB
Go
93 lines
1.9 KiB
Go
package main
|
|
|
|
import (
|
|
"database/sql"
|
|
"flag"
|
|
"fmt"
|
|
_ "github.com/go-sql-driver/mysql"
|
|
"log"
|
|
"os"
|
|
)
|
|
|
|
func main() {
|
|
host := flag.String("host", "localhost", "mysql server address")
|
|
port := flag.Uint("port", 3306, "mysql server port")
|
|
user := flag.String("user", "", "username")
|
|
password := flag.String("password", "", "password")
|
|
database := flag.String("database", "", "database to authenticate against")
|
|
flag.Parse()
|
|
|
|
logger := log.New(os.Stderr, "", 0)
|
|
dataSource := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s", *user, *password, *host, *port, *database)
|
|
db, err := sql.Open("mysql", dataSource)
|
|
|
|
if err != nil {
|
|
logger.Fatal(err)
|
|
}
|
|
defer db.Close()
|
|
|
|
runQuery := func(query string, processRows func(*sql.Rows) error) {
|
|
rows, err := db.Query(query)
|
|
if err != nil {
|
|
logger.Fatal(err)
|
|
}
|
|
|
|
columns, err := rows.Columns()
|
|
fmt.Println("Columns:")
|
|
for _, name := range columns {
|
|
fmt.Println(name)
|
|
}
|
|
|
|
columnsTypes, err := rows.ColumnTypes()
|
|
fmt.Println("Column types:")
|
|
for _, column := range columnsTypes {
|
|
fmt.Printf("%s %s\n", column.Name(), column.DatabaseTypeName())
|
|
}
|
|
|
|
fmt.Println("Result:")
|
|
err = processRows(rows)
|
|
if err != nil {
|
|
logger.Fatal(err)
|
|
}
|
|
|
|
err = rows.Close()
|
|
if err != nil {
|
|
logger.Fatal(err)
|
|
}
|
|
err = rows.Close()
|
|
if err != nil {
|
|
logger.Fatal(err)
|
|
}
|
|
}
|
|
|
|
processRows := func(rows *sql.Rows) error {
|
|
var x int
|
|
for rows.Next() {
|
|
err := rows.Scan(&x)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
fmt.Println(x)
|
|
}
|
|
return rows.Err()
|
|
}
|
|
runQuery("select number as a from system.numbers limit 2", processRows)
|
|
|
|
processRows = func(rows *sql.Rows) error {
|
|
var name string
|
|
var a int
|
|
for rows.Next() {
|
|
err := rows.Scan(&name, &a)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
fmt.Println(name, a)
|
|
}
|
|
return rows.Err()
|
|
}
|
|
runQuery("select name, 1 as a from system.tables where name == 'tables'", processRows)
|
|
|
|
runQuery("select 'тест' as a, 1 as b", processRows)
|
|
|
|
}
|