Postgresql with golang !

To use PostgreSQL with Go (also known as Golang), you will need to have Go and PostgreSQL installed on your system. If you have not yet installed Go and PostgreSQL, you can follow the instructions in previous answers to install them.

Once you have Go and PostgreSQL installed, you can use the database/sql package in Go to connect to and interact with the PostgreSQL database. The database/sql package provides a generic interface for working with SQL databases, and can be used with a variety of SQL database drivers. To use the database/sql package with PostgreSQL, you will need to install the github.com/lib/pq driver.

To connect to a PostgreSQL database using the database/sql package, you can use the sql.Open() function to establish a connection. This function takes the name of the SQL database driver and the database connection string as arguments, and returns a *sql.DB object representing the connection to the database.

Once you have a *sql.DB object, you can use it to execute SQL queries and statements. For example, to read data from the database, you can use the DB.Query() method to execute a SQL SELECT query and retrieve the results as a *sql.Rows object. You can then use the Rows.Scan() method to iterate over the rows in the results and retrieve the values of each column.

To update the database, you can use the DB.Exec() method to execute a SQL UPDATE statement. This method takes the SQL statement as an argument, and returns a sql.Result object containing information about the query, such as the number of rows affected.

To insert data into the database, you can use the DB.Exec() method to execute a SQL INSERT statement. This method takes the SQL statement as an argument, and returns a sql.Result object containing information about the query, such as the number of rows affected.

To delete data from the database, you can use the DB.Exec() method to execute a SQL DELETE statement. This method takes the SQL statement as an argument, and returns a sql.Result object containing information about the query, such as the number of rows affected.

Here is an example Go program that demonstrates how to connect to a PostgreSQL database, read and update data, and insert and delete rows.

List with postgresql

package main

import (
    "database/sql"
    "encoding/json"
    "fmt"
    "log"
    "net/http"

    _ "github.com/lib/pq" // Import the PostgreSQL driver.
)

// Define a "user" struct type with "id" and "name" fields.
type user struct {
    ID   int    `json:"id"`
    Name string `json:"name"`
}

// Connect to the PostgreSQL database and return a *sql.DB object.
func connect() *sql.DB {
    // Open a connection to the "postgres" database.
    db, err := sql.Open("postgres", "postgres://postgres@localhost/postgres?sslmode=disable")
    if err != nil {
        panic(err)
    }

    // Check the connection status.
    err = db.Ping()
    if err != nil {
        panic(err)
    }

    return db
}

// Handle an HTTP GET request to list all users.
func listUsers(w http.ResponseWriter, r *http.Request) {
    // Connect to the database.
    db := connect()
    defer db.Close()

    // Execute a SQL SELECT query to retrieve all users.
    rows, err := db.Query("SELECT id, name FROM users")
    if err != nil {
       

Delete with postgreSQL

package main

import (
    "database/sql"
    "fmt"
    "log"
    "net/http"
    "strconv"

    _ "github.com/lib/pq" // Import the PostgreSQL driver.
)

// Connect to the PostgreSQL database and return a *sql.DB object.
func connect() *sql.DB {
    // Open a connection to the "postgres" database.
    db, err := sql.Open("postgres", "postgres://postgres@localhost/postgres?sslmode=disable")
    if err != nil {
        panic(err)
    }

    // Check the connection status.
    err = db.Ping()
    if err != nil {
        panic(err)
    }

    return db
}

// Handle an HTTP DELETE request to delete a user by ID.
func deleteUser(w http.ResponseWriter, r *http.Request) {
    // Get the user ID from the URL query string.
    id, err := strconv.Atoi(r.URL.Query().Get("id"))
    if err != nil {
        http.Error(w, err.Error(), http.StatusBadRequest)
        return

Insert with postgresql

Here is an example Go program that implements a simple API that can be used to insert a user into a PostgreSQL database.

package main
package main

import (
    "database/sql"
    "fmt"
    "log"
    "net/http"

    _ "github.com/lib/pq" // Import the PostgreSQL driver.
)

// Define a "user" struct type with "id" and "name" fields.
type user struct {
    ID   int    `json:"id"`
    Name string `json:"name"`
}

// Connect to the PostgreSQL database and return a *sql.DB object.
func connect() *sql.DB {
    // Open a connection to the "postgres" database.
    db, err := sql.Open("postgres", "postgres://postgres@localhost/postgres?sslmode=disable")
    if err != nil {
        panic(err)
    }

    // Check the connection status.
    err = db.Ping()
    if err != nil {
        panic(err)
    }

    return db
}

// Handle an HTTP POST request to insert a new user.
func insertUser(w http.ResponseWriter, r *http.Request) {
    // Decode the JSON request body into a "user" struct.
    var u user
    if err := json.NewDecoder(r.Body).Decode(&u); err != nil {
        http.Error(w, err.Error(), http.StatusBadRequest)
        return
    }

    // Connect to the database.
    db := connect()
    defer db.Close()

    // Execute a SQL INSERT statement to insert the user.
    result, err := db.Exec("INSERT INTO users (id, name)")