update README.md and add example for LONG data type

README.md

@@ -11,7 +11,10 @@
       always ensure that you get latest release
     - See examples for more help
 ```
-
+### version 2.6.8: Fix return long data type with lob prefetch option:
+* know you can return up to 0x3FFFFFFF of data from long coumn type
+* examples/long insert 0x3FFF bytes of data into long column and query it again
+* for large data size better use `lob fetch=post`
 ### version 2.6.5: Add New Url Options (Language and Territory)
 * this will control the language of the server messages
 ```golang

examples/long/main.go

@@ -0,0 +1,111 @@
+package main
+
+import (
+	"database/sql"
+	"fmt"
+	_ "github.com/sijms/go-ora/v2"
+	"os"
+	"strings"
+	"time"
+)
+
+var longText = strings.Repeat("*", 0x3FFF)
+
+func createTable(conn *sql.DB) error {
+	t := time.Now()
+	sqlText := `CREATE TABLE GOORA_TEMP_LONG(
+	ID	number(10)	NOT NULL,
+	NAME		VARCHAR(200),
+	NAME_LONG   LONG,
+	VAL			number(10,2),
+	VISIT_DATE	date,
+	PRIMARY KEY(ID)
+	)`
+	_, err := conn.Exec(sqlText)
+	if err != nil {
+		return err
+	}
+	fmt.Println("Finish create table :", time.Now().Sub(t))
+	return nil
+}
+
+func dropTable(conn *sql.DB) error {
+	t := time.Now()
+	_, err := conn.Exec("drop table GOORA_TEMP_LONG purge")
+	if err != nil {
+		return err
+	}
+	fmt.Println("Finish drop table: ", time.Now().Sub(t))
+	return nil
+}
+
+func insertData(conn *sql.DB) error {
+	t := time.Now()
+	_, err := conn.Exec(`INSERT INTO GOORA_TEMP_LONG(ID, NAME, NAME_LONG, VAL, VISIT_DATE) VALUES(:1, :2, :3, :4, :5)`,
+		1, "test name", longText, 1.1, time.Now())
+	if err != nil {
+		return err
+	}
+	fmt.Println("Finish insert one row: ", time.Now().Sub(t))
+	return nil
+
+}
+
+func queryData(conn *sql.DB) error {
+	t := time.Now()
+	var (
+		name, nameLong string
+		val            float64
+		date           time.Time
+	)
+	err := conn.QueryRow("SELECT NAME, NAME_LONG, VAL, VISIT_DATE FROM GOORA_TEMP_LONG WHERE ID = 1").Scan(&name,
+		&nameLong, &val, &date)
+	if err != nil {
+		return err
+	}
+	fmt.Println("name: ", name)
+	fmt.Println("val: ", val)
+	fmt.Println("date: ", date)
+	if longText == nameLong {
+		fmt.Println("long text equal")
+	} else {
+		fmt.Println("long text not equal")
+	}
+	fmt.Println("Finish query: ", time.Now().Sub(t))
+	return nil
+}
+func main() {
+	conn, err := sql.Open("oracle", os.Getenv("DSN"))
+	if err != nil {
+		fmt.Println("can't open connection: ", err)
+		return
+	}
+	defer func() {
+		err = conn.Close()
+		if err != nil {
+			fmt.Println("can't close connection: ", err)
+		}
+	}()
+
+	err = createTable(conn)
+	if err != nil {
+		fmt.Println("can't create table: ", err)
+		return
+	}
+	defer func() {
+		err = dropTable(conn)
+		if err != nil {
+			fmt.Println("can't drop table: ", err)
+		}
+	}()
+
+	err = insertData(conn)
+	if err != nil {
+		fmt.Println("can't insert data: ", err)
+		return
+	}
+	err = queryData(conn)
+	if err != nil {
+		fmt.Println("can't query: ", err)
+	}
+}