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db.go
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db.go
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package orm
import (
"database/sql"
"fmt"
//mysql
_ "github.com/go-sql-driver/mysql"
"strings"
)
// DB db instance.
type DB struct {
IP string
Port int
DBName string
UserName string
Passwd string
Charset string
TimeOut int
}
//NewDB create db instance, timeout 单位:秒.
func NewDB(ip string, port int, dbName, user, pass, charset string, timeout int) *DB {
return &DB{
IP: ip,
Port: port,
DBName: dbName,
UserName: user,
Passwd: pass,
Charset: charset,
TimeOut: timeout,
}
}
// GetConnection open new connect to db.
func (db *DB) GetConnection() (*sql.DB, error) {
dsn := db.getDSN()
stmtDB, err := sql.Open("mysql", dsn)
if err != nil {
return nil, err
}
stmtDB.SetMaxOpenConns(0)
if err := stmtDB.Ping(); err != nil {
return nil, err
}
return stmtDB, nil
}
func (db *DB) getDSN() string {
dsn := fmt.Sprintf("%s:%s@tcp(%s:%d)/", db.UserName, db.Passwd, db.IP, db.Port)
if len(db.DBName) > 0 {
dsn = fmt.Sprintf("%s%s", dsn, db.DBName)
optStr := db.getOpt()
if len(optStr) > 0 {
dsn = fmt.Sprintf("%s?%s", dsn, optStr)
}
}
return dsn
}
func (db *DB) getOpt() string {
var opts []string
if len(db.Charset) > 0 {
opts = append(opts, fmt.Sprintf("charset=%s", db.Charset))
}
if db.TimeOut > 0 {
opts = append(opts, fmt.Sprintf("timeout=%ds", db.TimeOut))
}
return strings.Join(opts, "&")
}