Use method DB() to get database connection handle

README.md

@@ -76,10 +76,13 @@ db, err := Open("postgres", "user=gorm dbname=gorm sslmode=disable")
 // db, err = Open("mysql", "gorm:gorm@/gorm?charset=utf8&parseTime=True")
 // db, err = Open("sqlite3", "/tmp/gorm.db")
 
+// Get database connection handle [*sql.DB](http://golang.org/pkg/database/sql/#DB)
+d := db.DB()
 
-// Set the maximum idle database connections
-db.SetPool(100)
-
+// With it you could use package `database/sql`'s builtin methods
+db.DB().SetMaxIdleConns(10)
+db.DB().SetMaxOpenConns(100)
+db.DB().Ping()
 
 // By default, table name is plural of struct type, you can use struct type as table name with:
 db.SingularTable(true)

gorm_test.go

@@ -91,7 +91,7 @@ func init() {
 		// CREATE DATABASE 'gorm';
 		// GRANT ALL ON gorm.* TO 'gorm'@'localhost';
 		fmt.Println("testing mysql...")
-		db, err = Open("mysql", "gorm:gorm@/gorm?charset=utf8&parseTime=True")
+		db, err = Open("mysql", "gorm:gorm@/gorim?charset=utf8&parseTime=True")
 	case "sqlite":
 		fmt.Println("testing sqlite3...")
 		db, err = Open("sqlite3", "/tmp/gorm.db")
@@ -101,12 +101,11 @@ func init() {
 	}
 	// db.SetLogger(log.New(os.Stdout, "\r\n", 0))
 	// db.LogMode(true)
-
 	if err != nil {
 		panic(fmt.Sprintf("No error should happen when connect database, but got %+v", err))
 	}
 
-	db.SetPool(10)
+	db.DB().SetMaxIdleConns(10)
 
 	if err := db.DropTable(&User{}).Error; err != nil {
 		fmt.Printf("Got error when try to delete table users, %+v\n", err)

main.go

@@ -2,6 +2,7 @@ package gorm
 
 import (
 	"database/sql"
+
 	"github.com/jinzhu/gorm/dialect"
 )
 
@@ -26,6 +27,10 @@ func Open(driver, source string) (db DB, err error) {
 	return
 }
 
+func (s *DB) DB() *sql.DB {
+	return s.db.(*sql.DB)
+}
+
 func (s *DB) SetPool(n int) {
 	if db, ok := s.parent.db.(sqlDb); ok {
 		db.SetMaxIdleConns(n)