private string GetCurrentSql(string tableName)
{
    string sql;
    if (DBType.Name.ToLower() == DbCurrentType.MySql.ToString().ToLower())
    {
        sql = GetMySqlStructure(tableName);
    }
    else if (DBType.Name.ToLower() == DbCurrentType.PgSql.ToString().ToLower())
    {
        sql = GetPgSqlStructure(tableName);
    }
    else
    {
        sql = GetSqlServerStructure(tableName);
    }
    return sql;
}