Go Mysql

Example1

package main

import (
    "database/sql"
    "fmt"
    _ "github.com/go-sql-driver/mysql"
)

func main() {
    db, err := sql.Open("mysql", "user:password@/database")
    if err != nil {
        panic(err.Error())  // Just for example purpose. You should use proper error handling instead of panic
    }
    defer db.Close()

    // Prepare statement for inserting data
    stmtIns, err := db.Prepare("INSERT INTO squareNum VALUES( ?, ? )") // ? = placeholder
    if err != nil {
        panic(err.Error()) // proper error handling instead of panic in your app
    }
    defer stmtIns.Close() // Close the statement when we leave main() / the program terminates

    // Prepare statement for reading data
    stmtOut, err := db.Prepare("SELECT squareNumber FROM squarenum WHERE number = ?")
    if err != nil {
        panic(err.Error()) // proper error handling instead of panic in your app
    }
    defer stmtOut.Close()

    // Insert square numbers for 0-24 in the database
    for i := 0; i < 25; i++ {
        _, err = stmtIns.Exec(i, (i * i)) // Insert tuples (i, i^2)
        if err != nil {
            panic(err.Error()) // proper error handling instead of panic in your app
        }
    }

    var squareNum int // we "scan" the result in here

    // Query the square-number of 13
    err = stmtOut.QueryRow(13).Scan(&squareNum) // WHERE number = 13
    if err != nil {
        panic(err.Error()) // proper error handling instead of panic in your app
    }
    fmt.Printf("The square number of 13 is: %d", squareNum)

    // Query another number.. 1 maybe?
    err = stmtOut.QueryRow(1).Scan(&squareNum) // WHERE number = 1
    if err != nil {
        panic(err.Error()) // proper error handling instead of panic in your app
    }
    fmt.Printf("The square number of 1 is: %d", squareNum)
}

Example 2

package main

import (
    "database/sql"
    "fmt"
    _ "github.com/go-sql-driver/mysql"
)

func main() {
    // Open database connection
    db, err := sql.Open("mysql", "user:password@/dbname")
    if err != nil {
        panic(err.Error())  // Just for example purpose. You should use proper error handling instead of panic
    }
    defer db.Close()

    // Execute the query
    rows, err := db.Query("SELECT * FROM table")
    if err != nil {
        panic(err.Error()) // proper error handling instead of panic in your app
    }

    // Get column names
    columns, err := rows.Columns()
    if err != nil {
        panic(err.Error()) // proper error handling instead of panic in your app
    }

    // Make a slice for the values
    values := make([]sql.RawBytes, len(columns))

    // rows.Scan wants '[]interface{}' as an argument, so we must copy the
    // references into such a slice
    // See http://code.google.com/p/go-wiki/wiki/InterfaceSlice for details
    scanArgs := make([]interface{}, len(values))
    for i := range values {
        scanArgs[i] = &values[i]
    }

    // Fetch rows
    for rows.Next() {
        // get RawBytes from data
        err = rows.Scan(scanArgs...)
        if err != nil {
            panic(err.Error()) // proper error handling instead of panic in your app
        }

        // Now do something with the data.
        // Here we just print each column as a string.
        var value string
        for i, col := range values {
            // Here we can check if the value is nil (NULL value)
            if col == nil {
                value = "NULL"
            } else {
                value = string(col)
            }
            fmt.Println(columns[i], ": ", value)
        }
        fmt.Println("-----------------------------------")
    }
    if err = rows.Err(); err != nil {
        panic(err.Error()) // proper error handling instead of panic in your app
    }
}