go-ora

Pure go oracle client

important notes:

• the client is tested against oracle 10G, 11G and 12G and working properly
• supported parameter types is integer, double, strings and time.Time
• named parameter not supported to define parameter just put ':' + parameter_name in sql statment
• integeration with sql/database is done using simple form

Usage:

there are 2 way to use the client

A. Using sql/database interface

1- importing:

import (
  "database/sql"
  "fmt"
  _ "go-ora"
  "time"
)

2- create the connection

conn, err := sql.Open("oracle", "oracle://user:pass@dbname/service_name")
// check for error
defer conn.Close()

3- create statment

stmt, err := conn.Prepare("SELECT col_1, col_2, col_3 FROM table WHERE col_1 = :1 or col_2 = :2")
// check for error
defer stmt.CLose()

4- query

// suppose we have 2 params one time.Time and other is double
rows, err := stmt.Query(time.Date(2020, 9, 1, 0, 0, 0, 0, time.UTC), 9.2)
// check for error
defer rows.Close()

5- extract data using next

 for rows.Next() {
    // define vars
    err = rows.Scan(/*vars here */)
    // check for error
 }

6- use exec instead of query for update and insert stmt

// i make change in parameter no 4 to explain that you can use string in parameter name instead of numbers
stmt, err := conn.Prepare("UPDATE table SET col_1=:1, col_2=:2 WHERE col_3 = :3 or col_4 = :col_4_par")
// check for error
defer stmt.Close()
result, err := stmt.Exec(/*pars value*/)
// check for error
fmt.Println(result.RowsAffected())

7- using transaction:

// after step 2 "Create Connection"
tx, err := conn.Begin()
// check for error
stmt, err := tx.Prepare("sql text")
// check for error
// continue as above
tx.Commit()
// or
tx.Rollback()
// note: any stmt created from conn will not be committed or rolled back

B. direct use of the package

the benefit here is that you can use pl/sql and output parameters

1- import go_ora "go-ora"

2- create connection

conn, err := go_ora.NewConnection("oracle://user:pass@dbname/service_name")
// check for error
err = conn.Open()
// check for error
defer conn.Close()

2- create stmt

stmt := go_ora.NewStmt("sql or pl/sql text", conn)
defer stmt.Close()

3- add parameters

stmt.AddParam("name", value, size, go_ora.Input /* or go_ora.Output*/)
// note that size is need when you define string output parameters

4- exec or query as above and pass nil for parameters

5- after that you can read the output parameters using Pars variable of stmt structure