C# 如何在C中返回字符串数组列表
我是一个完全100%的初学者,所以请原谅我的无知提前C# 如何在C中返回字符串数组列表,c#,mysql,sql,c#-5.0,C#,Mysql,Sql,C# 5.0,我是一个完全100%的初学者,所以请原谅我的无知提前 有人能帮我从c数据库查询中返回这个列表数组吗?我正在使用VisualStudio编写一个c应用程序,它连接到我创建的MySQL数据库 这是我遇到问题的代码。我已经搜索了很多次,但我只是不明白的东西,请帮助 public List<string>[] clientList() // Select from customer table in MySQL db { string query = "SELECT "
有人能帮我从c数据库查询中返回这个列表数组吗?我正在使用VisualStudio编写一个c应用程序,它连接到我创建的MySQL数据库 这是我遇到问题的代码。我已经搜索了很多次,但我只是不明白的东西,请帮助
public List<string>[] clientList() // Select from customer table in MySQL db
{
string query = "SELECT " + thisItem + " FROM " + thisTable;
// Create list to store the results result
List<string>[] list = new List<string>[9];
list[0] = new List<string>();
list[1] = new List<string>();
list[2] = new List<string>();
list[3] = new List<string>();
list[4] = new List<string>();
list[5] = new List<string>();
list[6] = new List<string>();
list[7] = new List<string>();
list[8] = new List<string>();
if (this.OpenConnection() == true) // Open connection
{
MySqlCommand cmd = new MySqlCommand(query, connection); // Create Command
MySqlDataReader dataReader = cmd.ExecuteReader(); // Create data reader and Execute command
// Read data and store in list
// Request data from SQL db
Console.WriteLine("AQUIRRING DATA FROM SQL SERVER....");
while (dataReader.Read())
{
if (thisItem == "*" && (thisTable == "CUSTOMER") || (thisTable == "customer"))
{
list[0].Add(dataReader["ID"] + "");
list[1].Add(dataReader["NAME"] + "");
list[2].Add(dataReader["COMPANY"] + "");
list[3].Add(dataReader["PLANT"] + "");
list[4].Add(dataReader["CITY"] + "");
list[5].Add(dataReader["STATE"] + "");
list[6].Add(dataReader["CREATED"] + "");
list[7].Add(dataReader["VIEWED"] + "");
list[8].Add(dataReader["MODIFIED"] + "");
}
else
{
list[0].Add(dataReader[thisItem] + "");
}
}
dataReader.Close();
this.CloseConnection(); //Close Connection
return list[0]; // Return list to be used
}
else
{
return list[0]; // Return non-updated list if connection failed
}
有人能帮助解决这个很可能非常简单的问题吗?最好使用具有数据属性的类来保存您的信息。 写在记事本上,所以请原谅任何错误
public class Whatever
{
public List<Company> clientList() // Select from customer table in MySQL db
{
string query = "SELECT " + thisItem + " FROM " + thisTable;
// Create list to store the results result
List<Company> list = new List<Company>();
if (this.OpenConnection() == true) // Open connection
{
MySqlCommand cmd = new MySqlCommand(query, connection); // Create Command
MySqlDataReader dataReader = cmd.ExecuteReader(); // Create data reader and Execute command
// Read data and store in list
// Request data from SQL db
Console.WriteLine("AQUIRRING DATA FROM SQL SERVER....");
while (dataReader.Read())
{
if (thisItem == "*" && (thisTable == "CUSTOMER") || (thisTable == "customer"))
{
Company newCompany = new Company();
newCompany.ID = dataReader["ID"].ToString();
newCompany.Name = dataReader["NAME"].ToString();
...
...
... (You get the jist of it.)
list.add(newCompany);
}
}
dataReader.Close();
this.CloseConnection(); //Close Connection
return list; // Return list to be used
}
return list;
}
}
public class Company
{
ID {get;set;}
NAME {get;set;}
COMPANY {get;set;}
PLANT {get;set;}
CITY {get;set;}
STATE {get;set;}
CREATED {get;set;}
VIEWED {get;set;}
MODIFIED {get;set;}
}
您忘记了c-5.0标记。我正在使用visual basic编写一个c应用程序,它连接到我创建的MySQL数据库。你是说Visual Studio吗?为什么这些标记为C?return list而不是return list[0],它将编译您尝试创建列表列表?谢谢,我喜欢这个解决方案并将尝试实现它,看起来它将简化一些事情。
System.Collections.Generic.List`1[System.String]
public class Whatever
{
public List<Company> clientList() // Select from customer table in MySQL db
{
string query = "SELECT " + thisItem + " FROM " + thisTable;
// Create list to store the results result
List<Company> list = new List<Company>();
if (this.OpenConnection() == true) // Open connection
{
MySqlCommand cmd = new MySqlCommand(query, connection); // Create Command
MySqlDataReader dataReader = cmd.ExecuteReader(); // Create data reader and Execute command
// Read data and store in list
// Request data from SQL db
Console.WriteLine("AQUIRRING DATA FROM SQL SERVER....");
while (dataReader.Read())
{
if (thisItem == "*" && (thisTable == "CUSTOMER") || (thisTable == "customer"))
{
Company newCompany = new Company();
newCompany.ID = dataReader["ID"].ToString();
newCompany.Name = dataReader["NAME"].ToString();
...
...
... (You get the jist of it.)
list.add(newCompany);
}
}
dataReader.Close();
this.CloseConnection(); //Close Connection
return list; // Return list to be used
}
return list;
}
}
public class Company
{
ID {get;set;}
NAME {get;set;}
COMPANY {get;set;}
PLANT {get;set;}
CITY {get;set;}
STATE {get;set;}
CREATED {get;set;}
VIEWED {get;set;}
MODIFIED {get;set;}
}