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main.go
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main.go
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package main
import (
"database/sql"
"fmt"
go_ora "github.com/sijms/go-ora/v2"
"os"
"time"
)
func createTable(conn *sql.DB) error {
t := time.Now()
sqlText := `create table GOORA_TEST_BFILE (
FILE_ID NUMBER(10) NOT NULL,
FILE_DATA BFILE
)`
_, err := conn.Exec(sqlText)
if err == nil {
fmt.Println("Finish create table: ", time.Now().Sub(t))
}
return err
}
func dropTable(conn *sql.DB) error {
t := time.Now()
_, err := conn.Exec(`drop table GOORA_TEST_BFILE purge`)
if err == nil {
fmt.Println("Finish drop table: ", time.Now().Sub(t))
}
return err
}
func insertData(conn *sql.DB, id int, dirName, fileName string) error {
t := time.Now()
var file *go_ora.BFile
var err error
if len(dirName) > 0 {
file, err = go_ora.CreateBFile(conn, dirName, fileName)
if err != nil {
return err
}
} else {
file = go_ora.CreateNullBFile()
}
sqlText := `INSERT INTO GOORA_TEST_BFILE(FILE_ID, FILE_DATA) VALUES(:1, :2)`
_, err = conn.Exec(sqlText, id, file)
if err == nil {
fmt.Println("Finish insert row: ", time.Now().Sub(t))
}
return err
}
func deleteData(db *sql.DB) error {
t := time.Now()
_, err := db.Exec("DELETE FROM GOORA_TEST_BFILE")
if err != nil {
return err
}
fmt.Println("Finish delete: ", time.Now().Sub(t))
return nil
}
func query(db *sql.DB) error {
t := time.Now()
sqlText := "SELECT FILE_ID, FILE_DATA FROM GOORA_TEST_BFILE"
rows, err := db.Query(sqlText)
if err != nil {
return err
}
defer func() {
err = rows.Close()
if err != nil {
fmt.Println("Can't close rows: ", err)
}
}()
var id int64
var file go_ora.BFile
for rows.Next() {
err = rows.Scan(&id, &file)
if err != nil {
return err
}
fmt.Println("id: ", id, "\tDir: ", file.GetDirName(), "\tFile: ", file.GetFileName(), "\tValid: ", file.Valid)
}
fmt.Println("Finish query: ", time.Now().Sub(t))
return nil
}
func BFileOutputPar(db *sql.DB) error {
sqlText := `BEGIN SELECT FILE_ID, FILE_DATA INTO :1, :2 FROM GOORA_TEST_BFILE WHERE FILE_ID = 2; END;`
var (
id int64
file go_ora.BFile
)
_, err := db.Exec(sqlText, go_ora.Out{Dest: &id}, go_ora.Out{Dest: &file})
if err != nil {
return err
}
fmt.Println("ID: ", id)
err = workWithBFile(&file)
if err != nil {
return err
}
return nil
}
func workWithBFile(file *go_ora.BFile) error {
if !file.Valid {
fmt.Println("BFile value is nil")
return nil
}
err := file.Open()
if err != nil {
return err
}
defer func() {
err = file.Close()
if err != nil {
fmt.Println("Can't close file: ", err)
}
}()
exists, err := file.Exists()
if err != nil {
return err
}
if exists {
length, err := file.GetLength()
if err != nil {
return err
}
fmt.Println("File length: ", length)
fmt.Println("Read all data: ")
data, err := file.Read()
if err != nil {
return err
}
fmt.Println(string(data))
if length > 2 {
fmt.Println("Read From Position 2 to the end of the file: ")
data, err = file.ReadFromPos(2)
if err != nil {
return err
}
fmt.Println(string(data))
}
if length > 5 {
fmt.Println("Read 5 bytes starting from position 2: ")
data, err = file.ReadBytesFromPos(2, 5)
if err != nil {
return err
}
fmt.Println(string(data))
}
}
return nil
}
func main() {
db, err := sql.Open("oracle", os.Getenv("DSN"))
if err != nil {
fmt.Println("Can't open database: ", err)
return
}
defer func() {
err = db.Close()
if err != nil {
fmt.Println("can't close connection: ", err)
}
}()
//fmt.Println("Work with BFile object: ")
//bfile, err := go_ora.NewBFile2(db, os.Getenv("DIR_NAME"), os.Getenv("FILE_NAME"))
//if err != nil {
// fmt.Println("Can't create bfile object: ", err)
// return
//}
//err = workWithBFile(bfile)
//if err != nil {
// fmt.Println("BFile error: ", err)
// return
//}
err = createTable(db)
if err != nil {
fmt.Println("Can't create table: ", err)
return
}
defer func() {
err = dropTable(db)
if err != nil {
fmt.Println("Can't drop table: ", err)
}
}()
err = deleteData(db)
if err != nil {
fmt.Println("Can't delete data: ", err)
return
}
err = insertData(db, 1, os.Getenv("DIR_NAME"), os.Getenv("FILE_NAME"))
if err != nil {
fmt.Println("Can't insert data: ", err)
return
}
err = insertData(db, 2, "", "")
if err != nil {
fmt.Println("Can't insert data: ", err)
return
}
err = query(db)
if err != nil {
fmt.Println("Can't query: ", err)
return
}
err = BFileOutputPar(db)
if err != nil {
fmt.Println("Can't output: ", err)
return
}
}