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}\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();
#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}\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！");
}
}
#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}\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
}
}
#endregion
Console.ReadLine();
时间： 2024-08-07 04:34:17