ADO.Net练习1

一、

1、Car表数据查出显示
2、请输入要查的汽车名称：
     请输入要查的汽车油耗：
     请输入要查的汽车马力：

        static void Main(string[] args)
        {
            SqlConnection Car = new SqlConnection("server=.;database=bosamvs;user=sa;pwd=123456;");
            #region 1、Car表数据查出显示
            SqlCommand cmd = Car.CreateCommand();
            cmd.CommandText = "select code,name,oil,powers,exhaust,price from car";
            Car.Open();
            SqlDataReader table = cmd.ExecuteReader();
            if (table.HasRows)
            {
                while (table.Read())
                {
                    Console.WriteLine("编号：{0}	名字：{1}	油耗：{2}	马力：{3}	排量：{4}	价格：{5}", table["code"], table["name"], table["oil"], table["powers"], table["exhaust"], table["price"]);
                }
            }
            Car.Close();
            #endregion
            Console.ReadLine();
            Console.Clear();
            #region 2、请输入要查的汽车名称，油耗，马力：
            while (true)
            {
                Console.Write("请输入查询的汽车名称：");
                string name = Console.ReadLine();
                Console.Write("请输入查询的汽车油耗：");
                string oil = Console.ReadLine();
                Console.Write("请输入查询的汽车马力：");
                string powers = Console.ReadLine();
                #region 输入全部为空
                if (name == "" && oil == "" && powers == "")
                {
                    Console.WriteLine("***********************全部信息***********************");
                    SqlCommand cmd0 = Car.CreateCommand();
                    cmd0.CommandText = "select*from car";
                    try
                    {
                        Car.Open();
                        SqlDataReader table0 = cmd0.ExecuteReader();
                        if (table0.HasRows)
                        {
                            while (table0.Read())
                            {
                                Console.WriteLine("ID：{0}	编号：{1}	名字：{2}	系列：{3}	出厂日期：{4}	油耗：{5}	马力：{6}	排量：{7}	价格：{8}", table0["ids"], table0["code"], table0["name"], table0["brand"], table0["time"], table0["oil"], table0["powers"], table0["exhaust"], table0["price"]);
                            }
                        }
                        Car.Close();
                    }
                    catch
                    {
                        Console.WriteLine("查询出错！");
                    }
                }
                #endregion
                else
                {
                    #region 输入车名不为空
                    if (name != "")
                    {
                        #region 输入油耗为空
                        if (oil == "" && powers != "")
                        {
                            int powers1 = Convert.ToInt32(powers);
                            SqlCommand cmd1 = Car.CreateCommand();
                            cmd1.CommandText = "select code,name,oil,powers,exhaust,price from car where name like '%" + name + "%' or powers = " + powers1;
                            try
                            {
                                Car.Open();
                                SqlDataReader table1 = cmd1.ExecuteReader();
                                if (table1.HasRows)
                                {
                                    while (table1.Read())
                                    {
                                        Console.WriteLine("编号：{0}	名字：{1}	油耗：{2}	马力：{3}	排量：{4}	价格：{5}	", table1["code"], table1["name"], table1["oil"], table1["powers"], table1["exhaust"], table1["price"]);
                                    }
                                }
                                Car.Close();
                            }
                            catch
                            {
                                Console.WriteLine("查询出错！");
                            }
                        }
                        #endregion
                        #region 输入马力为空
                        else if (oil != "" && powers == "")
                        {
                            decimal oil1 = Convert.ToDecimal(oil);
                            SqlCommand cmd2 = Car.CreateCommand();
                            cmd2.CommandText = "select code,name,oil,powers,exhaust,price from car where name like '%" + name + "%' or oil = " + oil1;
                            try
                            {
                                Car.Open();
                                SqlDataReader table2 = cmd2.ExecuteReader();
                                if (table2.HasRows)
                                {
                                    while (table2.Read())
                                    {
                                        Console.WriteLine("编号：{0}	名字：{1}	油耗：{2}	马力：{3}	排量：{4}	价格：{5}	", table2["code"], table2["name"], table2["oil"], table2["powers"], table2["exhaust"], table2["price"]);
                                    }
                                }
                                Car.Close();
                            }
                            catch
                            {
                                Console.WriteLine("查询出错！");
                            }
                        }
                        #endregion
                        #region 输入油耗和马力都为空
                        else if (oil == "" && powers == "")
                        {
                            SqlCommand cmd3 = Car.CreateCommand();
                            cmd3.CommandText = "select code,name,oil,powers,exhaust,price from car where name like '%" + name + "%'";
                            try
                            {
                                Car.Open();
                                SqlDataReader table3 = cmd3.ExecuteReader();
                                if (table3.HasRows)
                                {
                                    while (table3.Read())
                                    {
                                        Console.WriteLine("编号：{0}	名字：{1}	油耗：{2}	马力：{3}	排量：{4}	价格：{5}	", table3["code"], table3["name"], table3["oil"], table3["powers"], table3["exhaust"], table3["price"]);
                                    }
                                }
                                Car.Close();
                            }
                            catch
                            {
                                Console.WriteLine("查询出错！");
                            }
                        }
                        #endregion
                        #region 全部输入
                        else if (oil != "" && powers != "")
                        {
                            decimal oil1 = Convert.ToDecimal(oil);
                            int powers1 = Convert.ToInt32(powers);
                            SqlCommand cmd4 = Car.CreateCommand();
                            cmd4.CommandText = "select code,name,oil,powers,exhaust,price from car where name like '%" + name + "%' or oil = " + oil1 + " or powers = " + powers1;
                            try
                            {
                                Car.Open();
                                SqlDataReader table4 = cmd4.ExecuteReader();
                                if (table4.HasRows)
                                {
                                    while (table4.Read())
                                    {
                                        Console.WriteLine("编号：{0}	名字：{1}	油耗：{2}	马力：{3}	排量：{4}	价格：{5}	", table4["code"], table4["name"], table4["oil"], table4["powers"], table4["exhaust"], table4["price"]);
                                    }
                                }
                                Car.Close();
                            }
                            catch
                            {
                                Console.WriteLine("查询出错！");
                            }
                        }
                        #endregion
                    }
                    #endregion
                    #region 输入油耗不为空
                    else if (oil != "")
                    {
                        #region 输入车名为空
                        if (name == "" && powers != "")
                        {
                            decimal oil2 = Convert.ToDecimal(oil);
                            int powers2 = Convert.ToInt32(powers);
                            SqlCommand cmd5 = Car.CreateCommand();
                            cmd5.CommandText = "select code,name,oil,powers,exhaust,price from car where oil=" + oil2 + " or powers=" + powers2;
                            try
                            {
                                Car.Open();
                                SqlDataReader table5 = cmd5.ExecuteReader();
                                if (table5.HasRows)
                                {
                                    while (table5.Read())
                                    {
                                        Console.WriteLine("编号：{0}	名字：{1}	油耗：{2}	马力：{3}	排量：{4}	价格：{5}	", table5["code"], table5["name"], table5["oil"], table5["powers"], table5["exhaust"], table5["price"]);
                                    }
                                }
                                Car.Close();
                            }
                            catch
                            {
                                Console.WriteLine("查询出错！");
                            }
                        }
                        #endregion
                        #region 输入马力为空
                        else if (name != "" && powers == "")
                        {
                            decimal oil2 = Convert.ToDecimal(oil);
                            SqlCommand cmd6 = Car.CreateCommand();
                            cmd6.CommandText = "select code,name,oil,powers,exhaust,price from car where name like '%" + name + "%' or oil=" + oil2;
                            try
                            {
                                Car.Open();
                                SqlDataReader table6 = cmd6.ExecuteReader();
                                if (table6.HasRows)
                                {
                                    while (table6.Read())
                                    {
                                        Console.WriteLine("编号：{0}	名字：{1}	油耗：{2}	马力：{3}	排量：{4}	价格：{5}	", table6["code"], table6["name"], table6["oil"], table6["powers"], table6["exhaust"], table6["price"]);
                                    }
                                }
                                Car.Close();
                            }
                            catch
                            {
                                Console.WriteLine("查询出错！");
                            }
                        }
                        #endregion
                        #region 输入车名和马力都为空
                        else if (name == "" && powers == "")
                        {
                            decimal oil2 = Convert.ToDecimal(oil);
                            SqlCommand cmd7 = Car.CreateCommand();
                            cmd7.CommandText = "select code,name,oil,powers,exhaust,price from car where oil=" + oil2;
                            Car.Open();
                            SqlDataReader table7 = cmd7.ExecuteReader();
                            if (table7.HasRows)
                            {
                                while (table7.Read())
                                {
                                    Console.WriteLine("编号：{0}	名字：{1}	油耗：{2}	马力：{3}	排量：{4}	价格：{5}	", table7["code"], table7["name"], table7["oil"], table7["powers"], table7["exhaust"], table7["price"]);
                                }
                            }
                            Car.Close();
                        }
                        #endregion
                    }
                    #endregion
                    #region 输入马力不为空
                    else if (powers != "")
                    {
                        #region 输入车名为空
                        if (name == "" && oil != "")
                        {
                            decimal oil2 = Convert.ToDecimal(oil);
                            int powers2 = Convert.ToInt32(powers);
                            SqlCommand cmd8 = Car.CreateCommand();
                            cmd8.CommandText = "select code,name,oil,powers,exhaust,price from car where oil=" + oil2 + " or powers=" + powers2;
                            try
                            {
                                Car.Open();
                                SqlDataReader table8 = cmd8.ExecuteReader();
                                if (table8.HasRows)
                                {
                                    while (table8.Read())
                                    {
                                        Console.WriteLine("编号：{0}	名字：{1}	油耗：{2}	马力：{3}	排量：{4}	价格：{5}	", table8["code"], table8["name"], table8["oil"], table8["powers"], table8["exhaust"], table8["price"]);
                                    }
                                }
                                Car.Close();
                            }
                            catch
                            {
                                Console.WriteLine("查询出错！");
                            }
                        }
                        #endregion
                        #region 输入油耗为空
                        else if (name != "" && oil == "")
                        {
                            int powers2 = Convert.ToInt32(powers);
                            SqlCommand cmd9 = Car.CreateCommand();
                            cmd9.CommandText = "select code,name,oil,powers,exhaust,price from car where name like '%" + name + "%' or powers=" + powers2;
                            try
                            {
                                Car.Open();
                                SqlDataReader table9 = cmd9.ExecuteReader();
                                if (table9.HasRows)
                                {
                                    while (table9.Read())
                                    {
                                        Console.WriteLine("编号：{0}	名字：{1}	油耗：{2}	马力：{3}	排量：{4}	价格：{5}	", table9["code"], table9["name"], table9["oil"], table9["powers"], table9["exhaust"], table9["price"]);
                                    }
                                }
                                Car.Close();
                            }
                            catch
                            {
                                Console.WriteLine("查询出错！");
                            }
                        }
                        #endregion
                        #region 输入车名和油耗都为空
                        else if (name == "" && oil == "")
                        {
                            int powers2 = Convert.ToInt32(powers);
                            SqlCommand cmd10 = Car.CreateCommand();
                            cmd10.CommandText = "select code,name,oil,powers,exhaust,price from car where powers=" + powers2;
                            try
                            {
                                Car.Open();
                                SqlDataReader table10 = cmd10.ExecuteReader();
                                if (table10.HasRows)
                                {
                                    while (table10.Read())
                                    {
                                        Console.WriteLine("编号：{0}	名字：{1}	油耗：{2}	马力：{3}	排量：{4}	价格：{5}	", table10["code"], table10["name"], table10["oil"], table10["powers"], table10["exhaust"], table10["price"]);
                                    }
                                }
                                Car.Close();
                            }
                            catch
                            {
                                Console.WriteLine("查询出错！");
                            }
                        }
                        #endregion
                    }
                    #endregion
                }
            }
            #endregion
            Console.ReadLine();