/// <summary>
/// 查找或者根据约定创建连接字符串
/// </summary>
/// <param name="dbSettingName"></param>
/// <returns></returns>
public static DbSetting FindOrCreate(string dbSettingName)
{
if (dbSettingName == null)
{
throw new ArgumentNullException("dbSetting"); //可以是空字符串。
}
DbSetting setting = null;
if (!_generatedSettings.TryGetValue(dbSettingName, out setting))
{
lock (_generatedSettings)
{
if (!_generatedSettings.TryGetValue(dbSettingName, out setting))
{
var config = ConfigurationHelper.GetConnectionString(dbSettingName);
if (config != null)
{
setting = new DbSetting
{
ConnectionString = config.ConnectionString,
ProviderName = config.ProviderName,
};
}
else
{
setting = Create(dbSettingName);
}
setting.Name = dbSettingName;
_generatedSettings.Add(dbSettingName, setting);
}
}
}
return(setting);
}
//private IDbTransaction _transaction;
#endregion
#region Constructor
/// <summary>
/// Constructor
///
/// this accessor uses <see cref="DbSetting"/> class to find its connection string, and creates connection by itself.
/// </summary>
/// <param name="connectionStringSettingName">the setting name in configuration file.</param>
public DbAccesser(string connectionStringSettingName)
{
var setting = DbSetting.FindOrCreate(connectionStringSettingName);
this.Init(setting);
}
public LongTimeDbAccesser(DbSetting setting) : base(setting)
{
}
