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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"
)
type Product struct {
Id int `udt:"ID"`
Name string `udt:"NAME"`
Desc string `udt:"DESCR"`
}
type Customer struct {
Id int `udt:"ID"`
Name string `udt:"NAME"`
Products []Product `udt:"PRODUCTS"`
FavProduct *Product `udt:"FAV_PRODUCT"`
}
func execCmd(db *sql.DB, stmts ...string) error {
for _, stmt := range stmts {
if _, err := db.Exec(stmt); err != nil {
if len(stmts) > 1 {
return fmt.Errorf("error: %v in execuation of stmt: %s", err, stmt)
} else {
return err
}
}
}
return nil
}
func createTypes(db *sql.DB) error {
return execCmd(db, `
create or replace type PRODUCT as object(
ID number,
NAME varchar2(100),
DESCR varchar2(100)
)`, `create or replace type ProductCol as table of product`, `
create or replace type CUSTOMER as object(
ID number,
FAV_PRODUCT PRODUCT,
NAME varchar2(100),
PRODUCTS ProductCol
)`)
}
func dropTypes(db *sql.DB) error {
return execCmd(db, "DROP TYPE CUSTOMER", "DROP TYPE ProductCol", "DROP TYPE PRODUCT")
}
func fullInputFullOutput(db *sql.DB) error {
input := Customer{
Id: 1,
Name: "customer_",
FavProduct: &Product{
1, "product_1", "description of product_1",
},
Products: []Product{
{1, "prduct_1", "description of product_1"},
{2, "prduct_2", "description of product_2"},
},
}
var output Customer
_, err := db.Exec(`
DECLARE
l_customer customer;
BEGIN
l_customer := :1;
l_customer.id := l_customer.id + 2;
l_customer.name := l_customer.name || '3';
l_customer.FAV_PRODUCT := PRODUCT(3, 'product_3', 'description of product_3');
for x in 3..5 loop
l_customer.products.extend;
l_customer.products(x) := product(x, 'product_' || x, 'description of product_' || x);
end loop;
:2 := l_customer;
END;`, go_ora.Object{Name: "Customer", Value: input},
go_ora.Object{Name: "Customer", Value: &output})
if err != nil {
return err
}
fmt.Println("full input full output: ", output)
if output.FavProduct != nil {
fmt.Println("fav product: ", output.FavProduct)
}
return nil
}
func fullInputNullOutput(db *sql.DB) error {
input := Customer{
Id: 1,
Name: "customer_",
FavProduct: &Product{
1, "product_1", "description of product_1",
},
Products: []Product{
{1, "prduct_1", "description of product_1"},
{2, "prduct_2", "description of product_2"},
},
}
var output Customer
_, err := db.Exec(`
DECLARE
l_customer customer;
BEGIN
l_customer := :1;
l_customer.id := l_customer.id + 2;
l_customer.name := l_customer.name || '3';
l_customer.FAV_PRODUCT := null;
l_customer.products := null;
:2 := l_customer;
END;`, go_ora.Object{Name: "Customer", Value: input},
go_ora.Object{Name: "Customer", Value: &output})
if err != nil {
return err
}
fmt.Println("full input null output: ", output)
if output.FavProduct != nil {
fmt.Println("fav product: ", output.FavProduct)
}
return nil
}
func nullInputFullOutput(db *sql.DB) error {
input := Customer{
Id: 1,
Name: "customer_",
}
var output Customer
_, err := db.Exec(`
DECLARE
l_customer customer;
BEGIN
l_customer := :1;
l_customer.id := l_customer.id + 2;
l_customer.name := l_customer.name || '3';
l_customer.FAV_PRODUCT := PRODUCT(1, 'product_1', 'description of product_1');
l_customer.Products := productCol();
for x in 1..5 loop
l_customer.products.extend;
l_customer.products(x) := product(x, 'product_' || x, 'description of product_' || x);
end loop;
:2 := l_customer;
END;`, go_ora.Object{Name: "Customer", Value: input},
go_ora.Object{Name: "customer", Value: &output})
if err != nil {
return err
}
fmt.Println("null input full output: ", output)
if output.FavProduct != nil {
fmt.Println("fav product: ", output.FavProduct)
}
return nil
}
func nullObject(db *sql.DB) error {
var output *Product
var output2 string
_, err := db.Exec(`
DECLARE
l_product Product := null;
BEGIN
:1 := l_product;
:2 := 'this is a test';
END;`, go_ora.Object{Name: "Product", Value: &output}, go_ora.Out{Dest: &output2, Size: 20})
fmt.Println(output)
fmt.Println(output2)
return err
}
func nullArray(db *sql.DB) error {
var output []Product
//output = append(output, Product{3, "product_3", "desc_3"})
var output2 string
_, err := db.Exec(`
DECLARE
l_products productCol := null;
BEGIN
:1 := l_products;
:2 := 'this is a test';
END;`, go_ora.Object{Name: "ProductCol", Value: &output}, go_ora.Out{Dest: &output2, Size: 30})
fmt.Println(output)
fmt.Println(output2)
return err
}
// passing nil nested type and receiving it
// passing nil nested array and receving it
func nullInputNullOutput(db *sql.DB) error {
input := Customer{
Id: 1,
Name: "customer_",
}
var output Customer
_, err := db.Exec(`
DECLARE
l_customer customer;
BEGIN
l_customer := :1;
l_customer.id := l_customer.id + 2;
l_customer.name := l_customer.name || '3';
:2 := l_customer;
END;`, go_ora.Object{Name: "Customer", Value: input},
go_ora.Object{Name: "customer", Value: &output})
if err != nil {
return err
}
fmt.Println("null input null output: ", output)
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 database: ", err)
}
}()
err = createTypes(db)
if err != nil {
fmt.Println("can't create types: ", err)
return
}
defer func() {
err = dropTypes(db)
if err != nil {
fmt.Println("can't drop types: ", err)
}
}()
err = go_ora.RegisterType(db, "product", "ProductCol", Product{})
if err != nil {
fmt.Println("can't register product: ", err)
return
}
err = go_ora.RegisterType(db, "customer", "", Customer{})
if err != nil {
fmt.Println("can't register customer: ", err)
return
}
err = nullInputNullOutput(db)
if err != nil {
fmt.Println("can't send null input null output: ", err)
return
}
fmt.Println()
err = nullInputFullOutput(db)
if err != nil {
fmt.Println("can't send null input full output: ", err)
return
}
fmt.Println()
err = fullInputFullOutput(db)
if err != nil {
fmt.Println("can't send full input full output: ", err)
return
}
fmt.Println()
err = fullInputNullOutput(db)
if err != nil {
fmt.Println("can't send full input null output: ", err)
return
}
fmt.Println()
err = nullArray(db)
if err != nil {
fmt.Println("can't get null array: ", err)
return
}
fmt.Println()
err = nullObject(db)
if err != nil {
fmt.Println("can't get null object: ", err)
return
}
}