/// <summary>
/// 根据数据库提供程序名称获取 <see cref="NDF.Data.Common.DbScriptParameterParser"/> 对象，该对象可用于对 SQL 脚本中定义的参数列表进行解析。
/// </summary>
/// <param name="providerName">数据库提供程序名称.</param>
/// <returns>返回一个 <see cref="NDF.Data.Common.DbScriptParameterParser"/> 对象，该对象可用于对 SQL 脚本中定义的参数列表进行解析。</returns>
public static DbScriptParameterParser GetScriptParameterParser(string providerName)
{
Check.NotEmpty(providerName, "providerName");
DbScriptParameterParser parser = null;
lock (_locker)
{
if (!DbScriptParameterParserCache.TryGetValue(providerName, out parser))
{
Type type = typeof(DbScriptParameterParser).GetSubClass().FirstOrDefault(t =>
{
var attribute = t.GetCustomAttributes(typeof(DbProviderAttribute), true).OfType <DbProviderAttribute>().FirstOrDefault();
return(attribute != null && attribute.ProviderName == providerName);
});
if (type == null)
{
if (!DbProviderFactoryExtensions.DbProviderFactoryClasses.Any(item => item.InvariantName == providerName))
{
throw new InvalidOperationException(string.Format(Resources.NotExistsAllowedDbProviderAttributeDbScriptParameterParser, providerName));
}
type = typeof(GenericScriptParameterParser);
}
parser = Activator.CreateInstance(type, providerName) as DbScriptParameterParser;
DbScriptParameterParserCache.Add(providerName, parser);
}
}
return(parser);
}
/// <summary>
/// 为 <see cref="System.Data.Common.DbProviderFactory"/> 实例提供一组工具方法扩展。
/// </summary>
/// <param name="factory">表示一个 <see cref="System.Data.Common.DbProviderFactory"/> 对象。</param>
/// <returns>返回一个 <see cref="NDF.Data.Common.DbScriptParameterParser"/> 对象，该对象可用于对 SQL 脚本中定义的参数列表进行解析。</returns>
public static DbScriptParameterParser GetScriptParameterParser(this DbProviderFactory factory)
{
string providerName = GetProviderName(factory);
return(DbScriptParameterParser.GetScriptParameterParser(providerName));
}