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main.go
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main.go
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package main
import (
"database/sql"
"flag"
"fmt"
"os"
"strings"
"time"
_ "github.com/illacloud/go-ora-v1"
)
func createTable(conn *sql.DB) error {
t := time.Now()
sqlText := `CREATE TABLE GOORA_TEMP_VISIT(
VISIT_ID number(10) NOT NULL,
NAME VARCHAR(200),
VAL number(10,2),
VISIT_DATE date,
PRIMARY KEY(VISIT_ID)
)`
_, err := conn.Exec(sqlText)
if err != nil {
return err
}
fmt.Println("Finish create table GOORA_TEMP_VISIT :", time.Now().Sub(t))
return nil
}
func insertData(conn *sql.DB) error {
t := time.Now()
index := 1
stmt, err := conn.Prepare(`INSERT INTO GOORA_TEMP_VISIT(VISIT_ID, NAME, VAL, VISIT_DATE)
VALUES(:1, :2, :3, :4)`)
if err != nil {
return err
}
defer func() {
_ = stmt.Close()
}()
nameText := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
val := 1.1
for index = 1; index <= 100; index++ {
_, err = stmt.Exec(index, nameText, val, time.Now())
if err != nil {
return err
}
val += 1.1
}
fmt.Println("100 rows inserted: ", time.Now().Sub(t))
return nil
}
func dropTable(conn *sql.DB) error {
t := time.Now()
_, err := conn.Exec("drop table GOORA_TEMP_VISIT purge")
if err != nil {
return err
}
fmt.Println("Finish drop table: ", time.Now().Sub(t))
return nil
}
func queryOutputPars(conn *sql.DB) error {
t := time.Now()
sqlText := `BEGIN
SELECT VISIT_ID, NAME, VAL, VISIT_DATE INTO :1, :2, :3, :4 FROM GOORA_TEMP_VISIT WHERE VISIT_ID = 1;
END;`
var (
id int64
name string
val float64
date time.Time
)
name = strings.Repeat(" ", 200)
_, err := conn.Exec(sqlText, sql.Out{Dest: &id}, sql.Out{Dest: &name},
sql.Out{Dest: &val}, sql.Out{Dest: &date})
if err != nil {
return err
}
fmt.Println("ID: ", id)
fmt.Println("Name: ", name)
fmt.Println("Val: ", val)
fmt.Println("Date: ", date)
fmt.Println("Finish query output pars: ", time.Now().Sub(t))
return nil
}
func usage() {
fmt.Println()
fmt.Println("output_par")
fmt.Println(" a complete code of create table insert, return output parameter then drop table.")
fmt.Println()
fmt.Println("Usage:")
fmt.Println(` output_par -server server_url`)
flag.PrintDefaults()
fmt.Println()
fmt.Println("Example:")
fmt.Println(` output_par -server "oracle://user:pass@server/service_name"`)
fmt.Println()
}
func main() {
var (
server string
)
flag.StringVar(&server, "server", "", "Server's URL, oracle://user:pass@server/service_name")
flag.Parse()
connStr := os.ExpandEnv(server)
if connStr == "" {
fmt.Println("Missing -server option")
usage()
os.Exit(1)
}
fmt.Println("Connection string: ", connStr)
conn, err := sql.Open("oracle", server)
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 = conn.Ping()
if err != nil {
fmt.Println("Can't ping connection", 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 = insertData(conn)
if err != nil {
fmt.Println("Can't insert data", err)
return
}
err = queryOutputPars(conn)
if err != nil {
fmt.Println("Can't get output parameters", err)
return
}
}