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main.go
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main.go
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package main
import (
"bytes"
"database/sql"
"database/sql/driver"
"flag"
"fmt"
_ "github.com/sijms/go-ora/v2"
go_ora "github.com/sijms/go-ora/v2"
"io/ioutil"
"os"
"strings"
"time"
)
var (
server string
)
func createTable(conn *sql.DB) error {
t := time.Now()
sqlText := `CREATE TABLE GOORA_TEMP_VISIT(
VISIT_ID number(10) NOT NULL,
VISIT_DATA CLOB,
VISIT_DATA2 CLOB,
VISIT_DATA3 BLOB,
VISIT_DATA4 BLOB,
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 readWithOutputParameters2() error {
t := time.Now()
conn, err := go_ora.NewConnection(server)
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 2nd connection: ", err)
}
}()
sqlText := `BEGIN
SELECT VISIT_DATA, VISIT_DATA2, VISIT_DATA3, VISIT_DATA4 INTO :1, :2, :3, :4 FROM GOORA_TEMP_VISIT WHERE VISIT_ID = 1;
END;`
stmt := go_ora.NewStmt(sqlText, conn)
defer func() {
err = stmt.Close()
if err != nil {
fmt.Println("Can't close stmt: ", err)
}
}()
var (
data go_ora.Clob
data2 go_ora.Clob
data3 go_ora.Blob
data4 go_ora.Blob
)
_, err = conn.Exec(sqlText, go_ora.Out{Dest: &data, Size: 100000}, go_ora.Out{Dest: &data2, Size: 10},
go_ora.Out{Dest: &data3, Size: 100000}, go_ora.Out{Dest: &data4, Size: 10})
if err != nil {
return err
}
if tempVal, ok := stmt.Pars[0].Value.(go_ora.Clob); ok {
printLargeString("Data1: ", tempVal.String)
}
printLargeString("Data2: ", data2.String)
if tempVal, ok := stmt.Pars[2].Value.(go_ora.Blob); ok {
printLargeString("Data3: ", string(tempVal.Data))
}
printLargeString("Data4: ", string(data4.Data))
//fmt.Println("Data2: ", data2.String)
//printLargeString("Data3: ", string(data3.Data))
//fmt.Println("Data4: ", string(data4.Data))
fmt.Println("Finish query output pars: ", time.Now().Sub(t))
return nil
}
func readWithOutputParameters(conn *sql.DB) error {
t := time.Now()
sqlText := `BEGIN
SELECT VISIT_DATA, VISIT_DATA2, VISIT_DATA3, VISIT_DATA4 INTO :1, :2, :3, :4 FROM GOORA_TEMP_VISIT WHERE VISIT_ID = 1;
END;`
var (
data go_ora.Clob
data2 go_ora.Clob
data3 go_ora.Blob
data4 go_ora.Blob
)
_, err := conn.Exec(sqlText, go_ora.Out{Dest: &data, Size: 100000}, go_ora.Out{Dest: &data2, Size: 10},
go_ora.Out{Dest: &data3, Size: 100000}, go_ora.Out{Dest: &data4, Size: 10})
if err != nil {
return err
}
printLargeString("Data1: ", data.String)
fmt.Println("Data2: ", data2.String)
printLargeString("Data3: ", string(data3.Data))
fmt.Println("Data4: ", string(data4.Data))
fmt.Println("Finish query output pars: ", time.Now().Sub(t))
return nil
}
func readWithSql(conn *sql.DB) error {
t := time.Now()
rows, err := conn.Query("SELECT VISIT_ID, VISIT_DATA, VISIT_DATA2, VISIT_DATA3, VISIT_DATA4 FROM GOORA_TEMP_VISIT")
if err != nil {
return err
}
defer func() {
err = rows.Close()
if err != nil {
fmt.Println("Can't close dataset: ", err)
}
}()
var (
visitID int64
data1 sql.NullString
data2 sql.NullString
data3 []byte
data4 []byte
)
cnt := 0
for rows.Next() {
err := rows.Scan(&visitID, &data1, &data2, &data3, &data4)
if err != nil {
return err
}
fmt.Println("ID: ", visitID)
if data1.Valid {
printLargeString("Data1: ", data1.String)
} else {
printLargeString("Data1: ", "")
}
fmt.Println("Data2: ", data2)
printLargeString("Data3: ", string(data3))
fmt.Println("Data4: ", string(data4))
cnt++
}
if rows.Err() != nil {
return rows.Err()
}
//if row != nil {
// var (
// visitID int64
// data1 string
// data2 string
// data3 []byte
// data4 []byte
// )
// err := row.Scan(&visitID, &data1, &data2, &data3, &data4)
// if err != nil {
// return err
// }
// fmt.Println("ID: ", visitID)
// printLargeString("Data1: ", data1)
// //fmt.Println("Data1: ", data1[:10], "...", data1[len(data1)-10:])
// fmt.Println("Data2: ", data2)
// printLargeString("Data3: ", string(data3))
// //fmt.Println("Data3: ", string(data3)[:5], "...", string(data3)[len(data3)-5:])
// fmt.Println("Data4: ", string(data4))
//}
fmt.Printf("%d row readed: %v\n", cnt, time.Now().Sub(t))
return nil
}
func printLargeString(prefix, data string) {
if len(data) <= 25 {
fmt.Println(prefix, data)
return
}
temp := strings.ReplaceAll(data, "\r", "")
temp = strings.ReplaceAll(temp, "\n", "\\n")
fmt.Println(prefix, temp[:25], "...........", temp[len(temp)-25:], "\tsize: ", len(data))
}
func insertData2() error {
t := time.Now()
conn, err := go_ora.NewConnection(server)
if err != nil {
return err
}
err = conn.Open()
defer func() {
err = conn.Close()
if err != nil {
fmt.Println("Can't close connection2: ", err)
}
}()
if err != nil {
return err
}
val, err := ioutil.ReadFile("clob.json")
if err != nil {
return err
}
val2 := go_ora.Clob{String: "string2"}
val1 := go_ora.Clob{String: string(val) + string(val) + string(val) + string(val) + string(val) + string(val) + string(val)}
stmt := go_ora.NewStmt(`INSERT INTO GOORA_TEMP_VISIT(VISIT_DATA, VISIT_DATA2, VISIT_ID) VALUES(:1, :2, :3)`, conn)
defer func() {
err = stmt.Close()
if err != nil {
fmt.Println("Can't close stmt: ", err)
}
}()
_, err = stmt.Exec([]driver.Value{val1, val2, 2})
if err != nil {
return err
}
fmt.Println("1 row inserted: ", time.Now().Sub(t))
return nil
}
func insertData3(conn *sql.DB) error {
t := time.Now()
val, err := ioutil.ReadFile("clob.json")
buffer := bytes.Buffer{}
for x := 0; x < 4; x++ {
buffer.Write(val)
}
_, err = conn.Exec("INSERT INTO GOORA_TEMP_VISIT(VISIT_ID, VISIT_DATA, VISIT_DATA3) VALUES(3, :1, :2)",
go_ora.Clob{String: string(buffer.Bytes())}, go_ora.Blob{Data: buffer.Bytes()})
if err != nil {
return err
}
fmt.Println("1 row inserted: ", time.Now().Sub(t))
return nil
}
func insertData(conn *sql.DB) error {
t := time.Now()
val, err := ioutil.ReadFile("clob.json")
if err != nil {
return err
}
_, err = conn.Exec(`INSERT INTO GOORA_TEMP_VISIT(VISIT_ID, VISIT_DATA, VISIT_DATA2, VISIT_DATA3, VISIT_DATA4)
VALUES(1, :1, :2, :3, :4)`,
string(val), go_ora.Clob{String: "string2"}, val, go_ora.Blob{Data: []byte("string2")})
if err != nil {
return err
}
fmt.Println("1 row inserted: ", time.Now().Sub(t))
return nil
}
func usage() {
fmt.Println()
fmt.Println("clob")
fmt.Println(" a code for using clob by create table GOORA_TEMP_VISIT then insert then drop")
fmt.Println()
fmt.Println("Usage:")
fmt.Println(` clob -server server_url`)
flag.PrintDefaults()
fmt.Println()
fmt.Println("Example:")
fmt.Println(` clob -server "oracle://user:pass@server/service_name"`)
fmt.Println()
}
func main() {
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 = insertData(conn)
if err != nil {
fmt.Println("Can't insert data: ", err)
return
}
err = insertData2()
if err != nil {
fmt.Println("Can't make 2nd insert: ", err)
return
}
err = insertData3(conn)
if err != nil {
fmt.Println("Can't make 3rd insert: ", err)
return
}
err = readWithSql(conn)
if err != nil {
fmt.Println("Can't read data with sql: ", err)
return
}
err = readWithOutputParameters(conn)
if err != nil {
fmt.Println("Can't read data with output1: ", err)
return
}
err = readWithOutputParameters2()
if err != nil {
fmt.Println("Can't read data with output2: ", err)
return
}
}