/// <summary>
/// 获取 Provider 的配置。
/// </summary>
/// <param name="setting">数据库实例配置对象。</param>
/// <param name="section">提供者配置节对象。</param>
/// <returns>一个提供者配置对象。</returns>
private static ProviderConfigurationSetting GetProviderSetting(IInstanceConfigurationSetting setting, ProviderConfigurationSection section)
{
if (section == null || string.IsNullOrEmpty(setting.ProviderName))
{
return(null);
}
return(section.Settings[setting.ProviderName]);
}
/// <summary>
/// 根据 <paramref name="setting"/> 获取对应的 <see cref="IProvider"/> 对象。
/// </summary>
/// <param name="setting">配置节信息。</param>
/// <returns></returns>
public static IProvider GetDefinedProviderInstance(IInstanceConfigurationSetting setting)
{
if (!string.IsNullOrEmpty(setting.ProviderName))
{
return(GetDefinedProviderInstance(setting.ProviderName));
}
return(GetDefinedProviderInstance(setting.ProviderType));
}
/// <summary>
/// 使用数据库配置实例创建一个 <see cref="Database"/> 实例对象。
/// </summary>
/// <param name="setting">实例配置对象。</param>
/// <returns>一个 <see cref="Database"/> 实例对象。</returns>
public static IDatabase CreateDatabase(IInstanceConfigurationSetting setting)
{
Guard.ArgumentNull(setting, "setting");
var section = ConfigurationUnity.GetSection <ProviderConfigurationSection>();
var providerSetting = GetProviderSetting(setting, section);
var provider = GetProvider(setting, providerSetting);
Guard.Assert(provider != null, new Exception(SR.GetString(SRKind.ProviderNotSupported)));
var database = new Database(setting.ConnectionString, provider);
return(database);
}
/// <summary>
/// 使用数据库配置实例创建一个 <see cref="Database"/> 实例对象。
/// </summary>
/// <param name="setting">实例配置对象。</param>
/// <param name="serviceProvider">检索服务提供者。</param>
/// <returns>一个 <see cref="Database"/> 实例对象。</returns>
public static IDatabase CreateDatabase(IInstanceConfigurationSetting setting, IServiceProvider serviceProvider = null)
{
Guard.ArgumentNull(setting, nameof(setting));
var section = ConfigurationUnity.GetSection <ProviderConfigurationSection>();
var providerSetting = GetProviderSetting(setting, section);
var provider = GetProvider(setting, providerSetting);
Guard.Assert(provider != null, new Exception(SR.GetString(SRKind.ProviderNotSupported)));
if (setting.Clusters.Count > 0)
{
return(new ScopedDatabase(GetDistributedConnections(setting), provider));
}
return(new ScopedDatabase(setting.ConnectionString, provider));
}
/// <summary>
/// 获取分布式的数据库连接串。
/// </summary>
/// <param name="setting"></param>
/// <returns></returns>
private static List <DistributedConnectionString> GetDistributedConnections(IInstanceConfigurationSetting setting)
{
if (setting.Clusters.Count > 0)
{
var connections = new List <DistributedConnectionString>();
foreach (var cluster in setting.Clusters)
{
connections.Add(new DistributedConnectionString(cluster.ConnectionString)
{
Mode = cluster.Mode,
Weight = cluster.Weight
});
}
return(connections);
}
return(null);
}
/// <summary>
/// 获取 IProvidre，如果没有 setting，则获取预定义类别的 IProvider 单例。
/// </summary>
/// <param name="setting">数据库实例配置对象。</param>
/// <param name="providerSetting">提供者配置对象。</param>
/// <returns>一个提供者对象。</returns>
private static IProvider GetProvider(IInstanceConfigurationSetting setting, ProviderConfigurationSetting providerSetting)
{
var providerName = providerSetting != null ? providerSetting.Name : setting.ProviderType;
return(ProviderHelper.GetDefinedProviderInstance(providerName));
}