C＃和SQL Server 2012參數化插入未執行

Question

當執行SqlCommand.ExecuteNonQuery ，本地數據庫不會填充，並且在命令之前或之后均不包含表。 這是編碼的問題，還是數據庫的建立？ 我可以手動向表中行，然后查詢並從中讀取，但不能插入。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.IO;

namespace FillGeologyDB
{
    public partial class Form1 : Form
    {
        Rock rock;
        List<Rock> rocks;
        string connectionString;
        string commandStatement;

        public Form1()
        {
            InitializeComponent();
            rock = new Rock();
            rocks = new List<Rock>();
            connectionString = @"Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\BitMaintenance.mdf;Integrated Security=True;Connect Timeout=30";
            commandStatement = "INSERT INTO Metamorphic (rock_Name, rock_Color, rock_Feature, rock_Mineral),"
            + "VALUES (@rock_Name, @rock_Color, @rock_Features, @rock_Mineral)";
        }

        private void btnStart_Click(object sender, EventArgs e)
        {
            StreamReader reader = new StreamReader("Metamorphic Rock.txt");
            while(reader.Peek() > -1)
            {
                rock.RockName = reader.ReadLine();
                rocks.Add(rock);   
            }
            reader.Close();

            int i = 0;
            reader = new StreamReader("Color.txt");
            while (reader.Peek() > -1)
            {
                rocks[i].RockColor = reader.ReadLine();
                i++;
            }
            reader.Close();

            i = 0;
            reader = new StreamReader("Features.txt");
            while (reader.Peek() > -1)
            {
                rocks[i].RockFeatures = reader.ReadLine();
                i++;
            }
            reader.Close();

            i = 0;
            reader = new StreamReader("Mineral.txt");
            while (reader.Peek() > -1)
            {
                rocks[i].RockMineral = reader.ReadLine();
                i++;
            }
            reader.Close();
        }

        public void LoadData()
        {

           using(SqlConnection connection = new SqlConnection(connectionString))

                foreach (Rock r in rocks)
                {
                    using(SqlCommand command = new SqlCommand(commandStatement, connection))
                    {   
                        command.Parameters.AddWithValue("@rock_Name", rock.RockName);
                        command.Parameters.AddWithValue("@rock_Color", rock.RockColor);
                        command.Parameters.AddWithValue("@rock_Features", rock.RockFeatures);
                        command.Parameters.AddWithValue("@rock_Mineral", rock.RockMineral);
                        try
                        {
                            connection.Open();
                            command.ExecuteNonQuery();
                        }
                        catch(SqlException ex)
                        {
                            throw ex;
                        }
                        finally
                        {
                            connection.Close();
                        }
                    }

                }
        }
    }
}

Answer 1

 commandStatement = "INSERT INTO Metamorphic (rock_Name, rock_Color, rock_Feature, rock_Mineral),"
            + "VALUES (@rock_Name, @rock_Color, @rock_Features, @rock_Mineral)";

您在VALUES之前有,也沒有" " ，則應解決此問題。 您也可以使用符號@在多行中寫字符串：

commandStatement = @"INSERT INTO 
                         Metamorphic (rock_Name, rock_Color, rock_Feature, rock_Mineral)
                     VALUES 
                         (@rock_Name, @rock_Color, @rock_Features, @rock_Mineral)";

PS：當您有疑問時，請添加您的問題。 不工作不是問題。 該代碼返回一個異常，這對於理解您的問題可能很有價值。 因此，您必須始終在問題中寫異常消息。

Answer 2

正如mybirthname所指出的那樣，我已經在本地創建並運行此文件，它似乎已解決了該問題。

您可以在本地運行此示例：

class Program
{
    static void Main(string[] args)
    {
        var connectionString = @"Your Connection string goes here";
        var commandStatement = "INSERT INTO Metamorphic (rock_Name, rock_Color, rock_Feature, rock_Mineral)"
        + "VALUES (@rock_Name, @rock_Color, @rock_Features, @rock_Mineral)";

        using (SqlConnection connection = new SqlConnection(connectionString))
        using (SqlCommand command = new SqlCommand(commandStatement, connection))
        {
            command.Parameters.AddWithValue("@rock_Name", "One");
            command.Parameters.AddWithValue("@rock_Color", "Two");
            command.Parameters.AddWithValue("@rock_Features", "Thre");
            command.Parameters.AddWithValue("@rock_Mineral", "Four");
            try
            {
                connection.Open();
                command.ExecuteNonQuery();
            }
            catch (SqlException ex)
            {
                throw ex;
            }
            finally
            {
                connection.Close();
            }
        } 
    }
}