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}\t名字：{1}\t油耗：{2}\t马力：{3}\t排量：{4}\t价格：{5}", table["code"], table["name"], table["oil"], table["powers"], table["exhaust"], table["price"]);}}Car.Close();#endregionConsole.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}\t编号：{1}\t名字：{2}\t系列：{3}\t出厂日期：{4}\t油耗：{5}\t马力：{6}\t排量：{7}\t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！");}}#endregionelse{#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}\t名字：{1}\t油耗：{2}\t马力：{3}\t排量：{4}\t价格：{5}\t", 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}\t名字：{1}\t油耗：{2}\t马力：{3}\t排量：{4}\t价格：{5}\t", 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}\t名字：{1}\t油耗：{2}\t马力：{3}\t排量：{4}\t价格：{5}\t", 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}\t名字：{1}\t油耗：{2}\t马力：{3}\t排量：{4}\t价格：{5}\t", 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}\t名字：{1}\t油耗：{2}\t马力：{3}\t排量：{4}\t价格：{5}\t", 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}\t名字：{1}\t油耗：{2}\t马力：{3}\t排量：{4}\t价格：{5}\t", 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}\t名字：{1}\t油耗：{2}\t马力：{3}\t排量：{4}\t价格：{5}\t", 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}\t名字：{1}\t油耗：{2}\t马力：{3}\t排量：{4}\t价格：{5}\t", 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}\t名字：{1}\t油耗：{2}\t马力：{3}\t排量：{4}\t价格：{5}\t", 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}\t名字：{1}\t油耗：{2}\t马力：{3}\t排量：{4}\t价格：{5}\t", table10["code"], table10["name"], table10["oil"], table10["powers"], table10["exhaust"], table10["price"]);}}Car.Close();}catch{Console.WriteLine("查询出错！");}}#endregion}#endregion}}#endregionConsole.ReadLine();