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Merge pull request #237 from LuisBosquez/master
Adding go tutorials
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‎samples/tutorials/go/README.md‎

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# Set up instructions
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1. `go get github.com/denisenkom/go-mssqldb`
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1. `go install github.com/denisenkom/go-mssqldb`
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1. `go run <your_sample>.go`

‎samples/tutorials/go/columnstore.go‎

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package main
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import _ "github.com/denisenkom/go-mssqldb"
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import "database/sql"
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import "log"
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import "fmt"
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import "time"
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var server = "localhost"
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var port = 1433
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var user = "sa"
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var password = "your_password"
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var database = "SampleDB"
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// Delete an employee from database
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func ExecuteAggregateStatement(db *sql.DB) {
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result, err := db.Prepare("SELECT SUM(Price) as sum FROM Table_with_5M_rows")
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if err != nil {
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fmt.Println("Error preparing query: " + err.Error())
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}
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row := result.QueryRow()
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var sum string
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err = row.Scan(&sum)
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fmt.Printf("Sum: %s\n", sum)
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}
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func main() {
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// Connect to database
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connString := fmt.Sprintf("server=%s;user id=%s;password=%s;port=%d;database=%s;",
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server, user, password, port, database)
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conn, err := sql.Open("mssql", connString)
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if err != nil {
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log.Fatal("Open connection failed:", err.Error())
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}
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fmt.Printf("Connected!\n")
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defer conn.Close()
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t1 := time.Now()
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fmt.Printf("Start time: %s\n", t1)
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ExecuteAggregateStatement(conn)
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t2 := time.Since(t1)
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fmt.Printf("The query took: %s\n", t2)
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}

‎samples/tutorials/go/connect.go‎

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package main
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import _ "github.com/denisenkom/go-mssqldb"
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import "database/sql"
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import "log"
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import "fmt"
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var server = "localhost"
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var port = 1433
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var user = "sa"
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var password = "your_password"
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func main() {
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connString := fmt.Sprintf("server=%s;user id=%s;password=%s;port=%d",
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server, user, password, port)
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conn, err := sql.Open("mssql", connString)
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if err != nil {
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log.Fatal("Open connection failed:", err.Error())
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}
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fmt.Printf("Connected!\n")
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defer conn.Close()
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stmt, err := conn.Prepare("select @@version")
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row := stmt.QueryRow()
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var result string
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err = row.Scan(&result)
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if err != nil {
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log.Fatal("Scan failed:", err.Error())
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}
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fmt.Printf("%s\n", result)
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}

‎samples/tutorials/go/crud.go‎

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package main
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import _ "github.com/denisenkom/go-mssqldb"
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import "database/sql"
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import "log"
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import "fmt"
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var server = "localhost"
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var port = 1433
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var user = "sa"
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var password = "your_password"
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var database = "SampleDB"
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// Create an employee
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func CreateEmployee(db *sql.DB, name string, location string) (int64, error) {
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tsql := fmt.Sprintf("INSERT INTO TestSchema.Employees (Name, Location) VALUES ('%s','%s');",
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name, location)
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result, err := db.Exec(tsql)
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if err != nil {
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fmt.Println("Error inserting new row: " + err.Error())
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return -1, err
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}
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return result.LastInsertId()
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}
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// Read all employees
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func ReadEmployees(db *sql.DB) (int, error) {
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tsql := fmt.Sprintf("SELECT Id, Name, Location FROM TestSchema.Employees;")
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rows, err := db.Query(tsql)
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if err != nil {
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fmt.Println("Error reading rows: " + err.Error())
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return -1, err
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}
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defer rows.Close()
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var count int = 0
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for rows.Next(){
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var name, location string
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var id int
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err := rows.Scan(&id, &name, &location)
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if err != nil {
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fmt.Println("Error reading rows: " + err.Error())
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return -1, err
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}
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fmt.Printf("ID: %d, Name: %s, Location: %s\n", id, name, location)
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count++
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}
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return count, nil
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}
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// Update an employee's information
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func UpdateEmployee(db *sql.DB, name string, location string) (int64, error) {
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tsql := fmt.Sprintf("UPDATE TestSchema.Employees SET Location = '%s' WHERE Name= '%s'",
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location, name)
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result, err := db.Exec(tsql)
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if err != nil {
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fmt.Println("Error updating row: " + err.Error())
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return -1, err
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}
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return result.LastInsertId()
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}
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// Delete an employee from database
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func DeleteEmployee(db *sql.DB, name string) (int64, error) {
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tsql := fmt.Sprintf("DELETE FROM TestSchema.Employees WHERE Name='%s';", name)
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result, err := db.Exec(tsql)
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if err != nil {
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fmt.Println("Error deleting row: " + err.Error())
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return -1, err
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}
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return result.RowsAffected()
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}
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func main() {
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// Connect to database
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connString := fmt.Sprintf("server=%s;user id=%s;password=%s;port=%d;database=%s;",
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server, user, password, port, database)
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conn, err := sql.Open("mssql", connString)
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if err != nil {
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log.Fatal("Open connection failed:", err.Error())
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}
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fmt.Printf("Connected!\n")
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defer conn.Close()
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// Create employee
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createId, err := CreateEmployee(conn, "Jake", "United States")
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fmt.Printf("Inserted ID: %d successfully.\n", createId)
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// Read employees
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count, err := ReadEmployees(conn)
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fmt.Printf("Read %d rows successfully.\n", count)
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// Update from database
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updateId, err := UpdateEmployee(conn, "Jake", "Poland")
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fmt.Printf("Updated row with ID: %d successfully.\n", updateId)
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// Delete from database
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rows, err := DeleteEmployee(conn, "Jake")
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fmt.Printf("Deleted %d rows successfully.\n", rows)
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}

‎samples/tutorials/go/orm.go‎

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package main
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import (
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"fmt"
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"github.com/jinzhu/gorm"
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_ "github.com/jinzhu/gorm/dialects/mssql"
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)
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var server = "localhost"
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var port = 1433
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var user = "sa"
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var password = "your_password"
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var database = "SampleDB"
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type User struct {
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gorm.Model
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FirstName string
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LastName string
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}
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type Task struct {
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gorm.Model
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Title string
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DueDate string
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IsComplete bool
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UserID uint
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}
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func ReadAllTasks(db *gorm.DB){
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var users []User
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var tasks []Task
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db.Find(&users)
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for _, user := range users{
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db.Model(&user).Related(&tasks)
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fmt.Printf("%s %s's tasks:\n", user.FirstName, user.LastName)
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for _, task := range tasks {
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fmt.Printf("Title: %s\nDueDate: %s\nIsComplete:%t\n\n",
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task.Title, task.DueDate, task.IsComplete)
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}
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}
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}
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func UpdateSomeonesTask(db *gorm.DB, userId int){
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var task Task
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db.Where("user_id = ?", userId).First(&task).Update("Title", "Buy donuts for Luis")
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fmt.Printf("Title: %s\nDueDate: %s\nIsComplete:%t\n\n",
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task.Title, task.DueDate, task.IsComplete)
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}
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func DeleteSomeonesTasks(db *gorm.DB, userId int){
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db.Where("user_id = ?", userId).Delete(&Task{})
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fmt.Printf("Deleted all tasks for user %d", userId)
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}
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func main() {
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connectionString := fmt.Sprintf("server=%s;user id=%s;password=%s;port=%d;database=%s",
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server, user, password, port, database)
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db, err := gorm.Open("mssql", connectionString)
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if err != nil {
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panic("failed to connect database")
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}
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gorm.DefaultCallback.Create().Remove("mssql:set_identity_insert")
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defer db.Close()
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fmt.Println("Migrating models...")
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db.AutoMigrate(&User{})
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db.AutoMigrate(&Task{})
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// Create awesome Users
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fmt.Println("Creating awesome users...")
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db.Create(&User{FirstName: "Andrea", LastName: "Lam"}) //UserID: 1
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db.Create(&User{FirstName: "Meet", LastName: "Bhagdev"}) //UserID: 2
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db.Create(&User{FirstName: "Luis", LastName: "Bosquez"}) //UserID: 3
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// Create appropriate Tasks for each user
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fmt.Println("Creating new appropriate tasks...")
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db.Create(&Task{
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Title: "Do laundry", DueDate: "2017-03-30", IsComplete: false, UserID: 1})
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db.Create(&Task{
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Title: "Mow the lawn", DueDate: "2017-03-30", IsComplete: false, UserID: 2})
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db.Create(&Task{
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Title: "Do more laundry", DueDate: "2017-03-30", IsComplete: false, UserID: 3})
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db.Create(&Task{
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Title: "Watch TV", DueDate: "2017-03-30", IsComplete: false, UserID: 3})
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// Read
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fmt.Println("Reading all the tasks...")
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ReadAllTasks(db)
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// Update - update Task title to something more appropriate
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fmt.Println("Updating Andrea's task...")
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UpdateSomeonesTask(db, 1)
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// Delete - delete Luis's task
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DeleteSomeonesTasks(db, 3)
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}

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