update readme

aorm.go

@@ -13,23 +13,53 @@ type DbContent struct {
 	DbLink     *sql.DB
 }
 
-func Store(destList ...interface{}) {
-	builder.Store(destList...)
+func (dc *DbContent) Db() *sql.DB {
+	return dc.DbLink
+}
+
+func (dc *DbContent) Begin() *sql.Tx {
+	tx, _ := dc.DbLink.Begin()
+	return tx
+}
+
+func (dc *DbContent) Exec(query string, args ...interface{}) (sql.Result, error) {
+	return dc.Exec(query, args...)
+}
+
+func (dc *DbContent) Prepare(query string) (*sql.Stmt, error) {
+	return dc.Prepare(query)
+}
+
+func (dc *DbContent) Query(query string, args ...interface{}) (*sql.Rows, error) {
+	return dc.Query(query, args...)
+}
+
+func (dc *DbContent) QueryRow(query string, args ...interface{}) *sql.Row {
+	return dc.QueryRow(query, args...)
 }
 
 //Open 开始一个数据库连接
-func Open(driverName string, dataSourceName string) (DbContent, error) {
+func Open(driverName string, dataSourceName string) (*DbContent, error) {
 	db, err := sql.Open(driverName, dataSourceName)
 	if err != nil {
-		return DbContent{}, err
+		return &DbContent{}, err
 	}
 
-	return DbContent{
+	err2 := db.Ping()
+	if err2 != nil {
+		return &DbContent{}, err2
+	}
+
+	return &DbContent{
 		DriverName: driverName,
 		DbLink:     db,
 	}, nil
 }
 
+func Store(destList ...interface{}) {
+	builder.Store(destList...)
+}
+
 // Db 开始一个数据库操作
 func Db(linkCommon ...model.LinkCommon) *builder.Builder {
 	b := &builder.Builder{}