init

internal/database/database.go

@@ -0,0 +1,46 @@
+package database
+
+import (
+	"fmt"
+	"log"
+
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+// Initialize creates and configures the database connection
+// Uses MySQL driver with proper connection pooling and charset support
+func Initialize(host, port, user, password, dbname, charset string) (*gorm.DB, error) {
+	// Configure GORM logger
+	gormLogger := logger.Default.LogMode(logger.Info)
+
+	// Build MySQL DSN (Data Source Name)
+	// Format: user:password@tcp(host:port)/dbname?charset=utf8mb4&parseTime=True&loc=Local
+	dsn := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=%s&parseTime=True&loc=Local",
+		user, password, host, port, dbname, charset)
+
+	// Open MySQL database connection
+	db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{
+		Logger: gormLogger,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("failed to connect to database: %w", err)
+	}
+
+	// Get underlying SQL DB for connection pool configuration
+	sqlDB, err := db.DB()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get underlying database: %w", err)
+	}
+
+	// Configure connection pool for MySQL
+	sqlDB.SetMaxIdleConns(10)      // Maximum number of idle connections
+	sqlDB.SetMaxOpenConns(100)     // Maximum number of open connections
+	sqlDB.SetConnMaxLifetime(3600) // Maximum connection lifetime (1 hour)
+	sqlDB.SetConnMaxIdleTime(600)  // Maximum idle time (10 minutes)
+
+	log.Printf("Database connected: %s@%s:%s/%s", user, host, port, dbname)
+
+	return db, nil
+}