How to connect golang to oracle

With the advent of the big data era, massive data has begun to be widely used in various aspects. Whether it is e-commerce, finance, medical care or artificial intelligence, a large amount of data needs to be processed. For this reason, data storage technology is changing. In this transformation process, relational database is still the most important data storage technology. Oracle database is one of the most important commercial relational databases on the market today. This article will introduce how to use Go language to connect to Oracle database.

1. Installing Oracle
   First, you need to install the Oracle database locally. The installation program provided by Oracle's official website can automatically set up all necessary configurations, and the installation program can run on Microsoft Windows and Linux operating systems. During the installation process, you need to pay attention to setting all necessary information for TNS, including service name, IP, user name and password, so that the application can use the Oracle database.
2. Install go-oci8
   The ORM framework of Go language is a ready-made solution, but you need to install the Oracle driver during use. go-oci8 is Oracle's driver for Golang and has good performance when connecting to Oracle databases. The following are the steps to install go-oci8:

go get gopkg.in/goracle.v2

3. Writing the connection code
   After installing the driver, you can start writing the Golang program to connect to the Oracle database. The following sample code will show how to create a program that connects to an Oracle database.

package main

import (
    "database/sql"
    "fmt"
    "log"
    _ "gopkg.in/goracle.v2"
)

func main() {
    db, err := sql.Open("goracle", "username/[email protected](ip:port)/database")
    if err != nil {
        log.Fatal(err)
    }
    defer db.Close()

    rows, err := db.Query("SELECT username FROM ALL_USERS")
    if err != nil {
        log.Fatal(err)
    }

    defer rows.Close()

    for rows.Next() {
        var username string
        if err := rows.Scan(&username); err != nil {
            log.Fatal(err)
        }
        fmt.Println(username)
    }

    if err := rows.Err(); err != nil {
        log.Fatal(err)
    }
}

In the above program, we first import the following packages:

• database/sql: Golang’s standard database interface
• log: Golang The standard logging library. We can use this to log error messages
• goracle: Oracle driver for Golang

Next, a connection to the Oracle database will be opened. Here, we use the connection method of "username/[email protected](ip:port)/database", where username and password are the user's authentication information, ip and port are the information of the database server, database Is the database to connect to. Finally, we use the db.Query() method to get some data from the database.

4. Conclusion
   So far we have completed learning how to use Golang to connect to the Oracle database. In the era of big data, Oracle is an important relational database and one of the core systems used by many enterprises. This article introduces how to connect to the Oracle database through the go-oci8 driver, which has good use value in practical applications. For Golang developers, this is a technical point that cannot be ignored.

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