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factory.go
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factory.go
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package database
import (
"errors"
"github.com/goal-web/contracts"
"github.com/goal-web/database/drivers"
"github.com/goal-web/supports/utils"
)
type Factory struct {
events contracts.EventDispatcher
connections map[string]contracts.DBConnection
drivers map[string]contracts.DBConnector
dbConfig Config
}
func NewFactory(config Config, events contracts.EventDispatcher) contracts.DBFactory {
return &Factory{
events: events,
dbConfig: config,
connections: make(map[string]contracts.DBConnection),
drivers: map[string]contracts.DBConnector{
"mysql": drivers.MysqlConnector,
"postgres": drivers.PostgresSqlConnector,
"sqlite": drivers.SqliteConnector,
"clickhouse": drivers.ClickHouseConnector,
},
}
}
func (factory *Factory) Connection(name ...string) contracts.DBConnection {
connection := factory.dbConfig.Default
if len(name) > 0 && name[0] != "" {
connection = name[0]
}
if conn, existsConnection := factory.connections[connection]; existsConnection {
return conn
}
factory.connections[connection] = factory.make(connection)
return factory.connections[connection]
}
func (factory *Factory) Extend(name string, driver contracts.DBConnector) {
factory.drivers[name] = driver
}
func (factory *Factory) make(name string) contracts.DBConnection {
config := factory.dbConfig
if connectionConfig, existsConnection := config.Connections[name]; existsConnection {
driverName := utils.GetStringField(connectionConfig, "driver")
if driver, existsDriver := factory.drivers[driverName]; existsDriver {
return driver(connectionConfig, factory.events)
}
panic(DBConnectionException{
Err: errors.New("该数据库驱动不存在:" + driverName),
Code: DbDriverDontExist,
Config: connectionConfig,
})
}
panic(DBConnectionException{
Err: errors.New("数据库连接不存在:" + name),
Code: DbConnectionDontExist,
Connection: name,
})
}