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main.go
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main.go
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package main
import (
"database/sql"
"database/sql/driver"
"flag"
"fmt"
go_ora "github.com/sijms/go-ora/v2"
"os"
"time"
)
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 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 bulkInsert(databaseUrl string) error {
conn, err := go_ora.NewConnection(databaseUrl)
if err != nil {
return err
}
err = conn.Open()
if err != nil {
return err
}
defer func() {
err = conn.Close()
if err != nil {
fmt.Println("Can't close connection: ", err)
}
}()
t := time.Now()
sqlText := `INSERT INTO GOORA_TEMP_VISIT(VISIT_ID, NAME, VAL, VISIT_DATE) VALUES(:1, :2, :3, :4)`
rowNum := 100
visitID := make([]driver.Value, rowNum)
nameText := make([]driver.Value, rowNum)
val := make([]driver.Value, rowNum)
date := make([]driver.Value, rowNum)
initalVal := 1.1
for index := 0; index < rowNum; index++ {
visitID[index] = index + 1
nameText[index] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
val[index] = initalVal
date[index] = time.Now().AddDate(0, index, 0)
initalVal += 1.1
//if index%5 == 0 {
// _, err = stmt.Exec(index, nameText, val, nil)
//} else {
// _, err = stmt.Exec(index, nameText, val, time.Now())
//}
//if err != nil {
// return err
//}
//val += 1.1
}
result, err := conn.BulkInsert(sqlText, rowNum, visitID, nameText, val, date)
if err != nil {
return err
}
rowsAffected, _ := result.RowsAffected()
fmt.Printf("%d rows inserted: %v\n", rowsAffected, time.Now().Sub(t))
return nil
}
func dropPackage(conn *sql.DB) error {
t := time.Now()
_, err := conn.Exec(`drop package GOORA_TEMP_PKG`)
if err != nil {
return err
}
fmt.Println("Drop package: ", time.Now().Sub(t))
return nil
}
func createPackage(conn *sql.DB) error {
t := time.Now()
sqlText := `create or replace package GOORA_TEMP_PKG as
type t_visit_id is table of GOORA_TEMP_VISIT.visit_id%type index by binary_integer;
type t_visit_name is table of GOORA_TEMP_VISIT.name%type index by binary_integer;
type t_visit_val is table of GOORA_TEMP_VISIT.val%type index by binary_integer;
type t_visit_date is table of GOORA_TEMP_VISIT.visit_date%type index by binary_integer;
procedure test_get1(p_visit_id t_visit_id, l_cursor out SYS_REFCURSOR);
procedure test_get2(p_visit_id t_visit_id, p_visit_name out t_visit_name,
p_visit_val out t_visit_val, p_visit_date out t_visit_date);
end GOORA_TEMP_PKG;
`
_, err := conn.Exec(sqlText)
if err != nil {
return err
}
sqlText = `create or replace PACKAGE BODY GOORA_TEMP_PKG as
procedure test_get1(p_visit_id t_visit_id, l_cursor out SYS_REFCURSOR) as
temp t_visit_id := p_visit_id;
begin
OPEN l_cursor for select visit_id, name, val, visit_date from GOORA_TEMP_VISIT
where visit_id in (select column_value from table(temp));
end test_get1;
procedure test_get2(p_visit_id t_visit_id, p_visit_name out t_visit_name,
p_visit_val out t_visit_val, p_visit_date out t_visit_date) as
temp t_visit_id := p_visit_id;
cursor tempCur is select visit_id, name, val, visit_date from GOORA_TEMP_VISIT
where visit_id in (select column_value from table(temp));
tempRow tempCur%rowtype;
idx number := 1;
begin
for tempRow in tempCur loop
p_visit_name(idx) := tempRow.name;
p_visit_val(idx) := tempRow.val;
p_visit_date(idx) := tempRow.visit_date;
idx := idx + 1;
end loop;
end test_get2;
end GOORA_TEMP_PKG;
`
_, err = conn.Exec(sqlText)
if err != nil {
return err
}
fmt.Println("Finish create package: ", time.Now().Sub(t))
return nil
}
// function do something like "SELECT col1, col2, ... FROM table WHERE col1 in (values)"
func query1(conn *sql.DB) error {
t := time.Now()
var cursor go_ora.RefCursor
// sql code take input array of integer and return a cursor that can be queried for result
_, err := conn.Exec(`BEGIN GOORA_TEMP_PKG.TEST_GET1(:1, :2); END;`, []int64{1, 3, 5}, sql.Out{Dest: &cursor})
if err != nil {
return err
}
defer func() {
err = cursor.Close()
if err != nil {
fmt.Println("Can't close RefCursor", err)
}
}()
err = queryCursor(&cursor)
if err != nil {
return err
}
fmt.Println("Finish Query1: ", time.Now().Sub(t))
return nil
}
// this function take one input array and return 3 output arraies of different types
func query2(conn *sql.DB) error {
t := time.Now()
var (
nameArray []string
valArray []float32
dateArray []sql.NullTime
)
// note size here is important and equal to max number of items that array can accommodate
_, err := conn.Exec(`BEGIN GOORA_TEMP_PKG.TEST_GET2(:1, :2, :3, :4); END;`,
[]int{1, 3, 5}, go_ora.Out{Dest: &nameArray, Size: 10},
go_ora.Out{Dest: &valArray, Size: 10},
go_ora.Out{Dest: &dateArray, Size: 10})
if err != nil {
return err
}
fmt.Println(nameArray)
fmt.Println(valArray)
fmt.Println(dateArray)
fmt.Println("Finish Query2: ", time.Now().Sub(t))
return nil
}
func queryCursor(cursor *go_ora.RefCursor) error {
t := time.Now()
rows, err := cursor.Query()
if err != nil {
return err
}
var (
id int64
name string
val float32
date sql.NullTime
)
for rows.Next_() {
err = rows.Scan(&id, &name, &val, &date)
if err != nil {
return err
}
fmt.Println("ID: ", id, "\tName: ", name, "\tval: ", val, "\tDate: ", date)
}
fmt.Println("Finish query RefCursor: ", time.Now().Sub(t))
return rows.Err()
}
func usage() {
fmt.Println()
fmt.Println("array")
fmt.Println(" a complete code dealing with array.")
fmt.Println()
fmt.Println("Usage:")
fmt.Println(` array -server server_url`)
flag.PrintDefaults()
fmt.Println()
fmt.Println("Example:")
fmt.Println(` array -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", connStr)
if err != nil {
fmt.Println("Can't open the driver: ", 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 = bulkInsert(connStr)
if err != nil {
fmt.Println("Can't bulkInsert: ", err)
return
}
// oracle assocuative array need type table indexed by binary_integer which can
// only defined inside the package
err = createPackage(conn)
if err != nil {
fmt.Println("Can't create package: ", err)
}
defer func() {
err = dropPackage(conn)
if err != nil {
fmt.Println("Can't drop package: ", err)
}
}()
err = query1(conn)
if err != nil {
fmt.Println("Can't call query1: ", err)
return
}
err = query2(conn)
if err != nil {
fmt.Println("Can't call query2: ", err)
}
}