add sql example

core/nkode/nkode_sqlite.go

@@ -1 +0,0 @@
-package nkode

core/sql-driver/sql_driver.go

@@ -0,0 +1,86 @@
+package sql_driver
+
+import (
+	"database/sql"
+	"fmt"
+	_ "github.com/mattn/go-sqlite3" // Import the SQLite3 driver
+	"log"
+)
+
+func InitTables() {
+	db, err := sql.Open("sqlite3", "./example.db")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	// Create a table
+	createTableSQL := `
+    CREATE TABLE IF NOT EXISTS users (
+        id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+        name TEXT,
+        age INTEGER
+    );
+    `
+	_, err = db.Exec(createTableSQL)
+	if err != nil {
+		log.Fatalf("Error creating table: %s", err)
+	}
+
+	// Insert data into the table
+	insertUserSQL := `INSERT INTO users (name, age) VALUES (?, ?)`
+	_, err = db.Exec(insertUserSQL, "Alice", 30)
+	if err != nil {
+		log.Fatalf("Error inserting data: %s", err)
+	}
+
+	_, err = db.Exec(insertUserSQL, "Bob", 25)
+	if err != nil {
+		log.Fatalf("Error inserting data: %s", err)
+	}
+
+	// Query the data
+	queryUserSQL := `SELECT id, name, age FROM users`
+	rows, err := db.Query(queryUserSQL)
+	if err != nil {
+		log.Fatalf("Error querying data: %s", err)
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var id int
+		var name string
+		var age int
+		err = rows.Scan(&id, &name, &age)
+		if err != nil {
+			log.Fatalf("Error scanning data: %s", err)
+		}
+		fmt.Printf("User: ID=%d, Name=%s, Age=%d\n", id, name, age)
+	}
+
+	// Update data
+	updateUserSQL := `UPDATE users SET age = ? WHERE name = ?`
+	_, err = db.Exec(updateUserSQL, 35, "Alice")
+	if err != nil {
+		log.Fatalf("Error updating data: %s", err)
+	}
+
+	// Verify the update
+	fmt.Println("After update:")
+	rows, err = db.Query(queryUserSQL)
+	if err != nil {
+		log.Fatalf("Error querying data: %s", err)
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var id int
+		var name string
+		var age int
+		err = rows.Scan(&id, &name, &age)
+		if err != nil {
+			log.Fatalf("Error scanning data: %s", err)
+		}
+		fmt.Printf("User: ID=%d, Name=%s, Age=%d\n", id, name, age)
+	}
+}

core/sql-driver/sql_driver_test.go

@@ -0,0 +1,7 @@
+package sql_driver
+
+import "testing"
+
+func TestInitTables(t *testing.T) {
+	InitTables()
+}