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main.go
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main.go
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package main
import (
"database/sql"
"fmt"
_ "github.com/sijms/go-ora/v2"
"os"
"time"
)
func createTable(conn *sql.DB) error {
t := time.Now()
sqlText := `CREATE TABLE TEMP_TABLE_350(
ID number(10) NOT NULL,
NAME VARCHAR2(500),
NAME2 NVARCHAR2(500),
VAL number(10,2),
VAL2 number(10),
LDATE date,
LDATE2 TIMESTAMP,
LDATE3 TIMESTAMP WITH TIME ZONE,
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 TEMP_TABLE_350 purge")
if err != nil {
return err
}
fmt.Println("finish drop table: ", time.Now().Sub(t))
return nil
}
func query2(conn *sql.DB) error {
rows, err := conn.Query(`select OWNER, TABLE_NAME, COLUMN_NAME, DATA_TYPE, COLUMN_ID, DATA_DEFAULT, NULLABLE,
COLLATION from ALL_TAB_COLUMNS WHERE TABLE_NAME = 'TEMP_TABLE_35'`)
if err != nil {
return err
}
defer func() {
err = rows.Close()
if err != nil {
fmt.Println("can't close rows: ", err)
}
}()
var (
schemaName, tableName, columnName, columnType, defaultStr, nullable, collation sql.NullString
columnPosition int
)
for rows.Next() {
err = rows.Scan(&schemaName, &tableName, &columnName, &columnType, &columnPosition, &defaultStr, &nullable, &collation)
if err != nil {
return err
}
}
return nil
}
func query(conn *sql.DB) error {
rows, err := conn.Query(`SELECT ID FROM TEMP_TABLE_350`)
if err != nil {
return err
}
defer func() {
err = rows.Close()
if err != nil {
fmt.Println("can't close rows: ", err)
}
}()
var id int
for rows.Next() {
err = rows.Scan(&id)
if err != nil {
return err
}
fmt.Println(id)
}
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)
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 = query2(conn)
if err != nil {
fmt.Println("can't query: ", err)
return
}
}