Golang如何使用抽象工厂模式创建多产品族_Golang Abtract Factory模式应用技巧

<strong>2. 定义抽象工厂接口</strong>

```go

type DatabaseFactory interface {

    CreateConnection() Connection

    CreateTransaction() Transaction

}

// MySQL产品族

type MySQLConnection struct{}

func (m *MySQLConnection) Connect() string { return "MySQL connected" }

type MySQLTransaction struct{}

func (m *MySQLTransaction) Begin() string { return "MySQL transaction started" }

type MySQLFactory struct{}

func (f *MySQLFactory) CreateConnection() Connection {

    return &MySQLConnection{}

}

func (f *MySQLFactory) CreateTransaction() Transaction {

    return &MySQLTransaction{}

}

// PostgreSQL产品族

type PGConnection struct{}

func (p *PGConnection) Connect() string { return "PostgreSQL connected" }

type PGTransaction struct{}

func (p *PGTransaction) Begin() string { return "PostgreSQL transaction started" }

type PostgresFactory struct{}

func (f *PostgresFactory) CreateConnection() Connection {

    return &PGConnection{}

}

func (f *PostgresFactory) CreateTransaction() Transaction {

    return &PGTransaction{}

}

func main() {

    var factory DatabaseFactory

    // 切换工厂即可切换整个产品族

    dbType := "mysql"

    if dbType == "postgres" {

        factory = &PostgresFactory{}

    } else {

        factory = &MySQLFactory{}

    }

    conn := factory.CreateConnection()

    tx := factory.CreateTransaction()

    fmt.Println(conn.Connect()) // 输出对应数据库连接信息

    fmt.Println(tx.Begin())     // 输出对应事务信息

}