/// <summary>
/// 使用指定的连接字符串创建<see cref="IDbProvider"/>对象
/// </summary>
/// <param name="connString">A connectionString.</param>
/// <returns>A DbProvider.</returns>
private static IDbProvider CreateDbProvider(string connString)
{
if (string.IsNullOrEmpty(connString))
{
throw new ArgumentException("the connectionString provided to the provider can not be null.", "connString");
}
IDbProvider dbProvider = DbProviderFactoryObj.GetProvider();
dbProvider.ConnectionString = connString;
return(dbProvider);
}
public DbHelper(string providerInvariantName)
{
dbProvider = DbProviderFactoryObj.GetProvider(providerInvariantName);
}
public DbHelper()
{
dbProvider = DbProviderFactoryObj.GetProvider();
}
