• 请注意导入 github.com/lib/pq 的副作用
• 在此之后，可以通过db.Query（）或db.Exec（）运行查询
• https://golang.org/pkg/database/sql/#example_DB_Query
• https://golang.org/pkg/database/sql/#pkg-examples

import (
    "database/sql"
    "fmt"
    _ "github.com/lib/pq"
)
func MakeRedshfitConnection(username, password, host, port, dbName string) (*sql.DB, error) {
    url := fmt.Sprintf("sslmode=require user=%v password=%v host=%v port=%v dbname=%v",
        username,
        password,
        host,
        port,
        dbName)
    var err error
    var db *sql.DB
    if db, err = sql.Open("postgres", url); err != nil {
        return nil, fmt.Errorf("redshift conn error : (%v)", err)
    }
    if err = db.Ping(); err != nil {
        return nil, fmt.Errorf("redshift ping error : (%v)", err)
    }
    return db, nil
}

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