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main.go
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main.go
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package main
import (
"context"
"database/sql"
"fmt"
go_ora "github.com/sijms/go-ora/v2"
"os"
"time"
)
type Mat struct {
Id sql.NullString
Response go_ora.Clob
}
func MatCol(colname string, mat *Mat) interface{} {
switch colname {
case "ID":
return &mat.Id
case "RESPONSE":
return &mat.Response
default:
return new(string)
}
}
func read(conn *sql.DB) error {
rows, err := conn.Query("SELECT ID, RESPONSE FROM TEMP_TABLE_320")
if err != nil {
return err
}
defer func() {
err = rows.Close()
if err != nil {
fmt.Println("Can't close rows: ", err)
}
}()
columns, err := rows.Columns()
if err != nil {
return err
}
for rows.Next() {
mat := Mat{}
values := make([]interface{}, len(columns))
for i, v := range columns {
values[i] = MatCol(v, &mat)
}
err = rows.Scan(values...)
if err != nil {
return err
}
fmt.Println(values)
}
return nil
}
func createTable(conn *sql.DB) error {
t := time.Now()
sqlText := `CREATE TABLE TEMP_TABLE_320(
ID varchar2(100),
RESPONSE CLOB
)`
_, 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 TEMP_TABLE_320 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 TEMP_TABLE_320(ID, RESPONSE) VALUES('1', 'THIS IS A TEST')")
if err != nil {
return err
}
fmt.Println("Finish insert one row: ", time.Now().Sub(t))
return nil
}
func createRefCursorProc(conn *sql.DB) error {
sqlText := `CREATE OR REPLACE FUNCTION TEMP_PROC_320 RETURN SYS_REFCURSOR AS
L_CURSOR SYS_REFCURSOR;
BEGIN
OPEN L_CURSOR FOR SELECT ID, RESPONSE FROM TEMP_TABLE_320;
return L_CURSOR;
END TEMP_PROC_320;`
t := time.Now()
_, err := conn.Exec(sqlText)
if err != nil {
return err
}
fmt.Println("Finish create refcursor procedure: ", time.Now().Sub(t))
return nil
}
func dropRefCursorProc(conn *sql.DB) error {
t := time.Now()
_, err := conn.Exec("DROP FUNCTION TEMP_PROC_320")
if err != nil {
return err
}
fmt.Println("Finish drop refcursor procedure: ", time.Now().Sub(t))
return nil
}
func readWithRefCursor(conn *sql.DB) error {
var cursor go_ora.RefCursor
var err error
_, err = conn.ExecContext(context.Background(), `BEGIN :1 := TEMP_PROC_320(); END;`, sql.Out{Dest: &cursor})
if err != nil {
return err
}
defer func() {
err = cursor.Close()
if err != nil {
fmt.Println("can't close cursor: ", err)
}
}()
rows, err := cursor.Query()
if err != nil {
return err
}
defer func() {
err = rows.Close()
if err != nil {
fmt.Println("can't close rows: ", err)
}
}()
columns := rows.Columns()
for rows.Next_() {
mat := Mat{}
values := make([]interface{}, len(columns))
for i, v := range columns {
values[i] = MatCol(v, &mat)
}
err = rows.Scan(values...)
if err != nil {
return err
}
fmt.Println(values)
}
return nil
}
func main() {
conn, err := sql.Open("oracle", os.Getenv("DSN"))
if err != nil {
fmt.Println("Can't connect: ", err)
return
}
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 = createRefCursorProc(conn)
if err != nil {
fmt.Println("can't create refcursor proc: ", err)
return
}
defer func() {
err = dropRefCursorProc(conn)
if err != nil {
fmt.Println("can't drop refcursor proc: ", err)
}
}()
err = insertData(conn)
if err != nil {
fmt.Println("can't insert data: ", err)
return
}
err = read(conn)
if err != nil {
fmt.Println("can't read data: ", err)
return
}
err = readWithRefCursor(conn)
if err != nil {
fmt.Println("can't read data with refcursor: ", err)
return
}
}