SQL C＃附近的語法不正確

Question

我試圖編寫代碼以將所有數據從網格插入表中。 在網格中，我顯示了我所需要的，這不是問題，或者沒有給出錯誤

顯示此錯誤：

System.Data.SqlClient.SqlException：“ {”附近的語法不正確

string StrQuery;
                try
                {
                    using (SqlConnection conn = new SqlConnection(stringcon))
                    {
                        using (SqlCommand comm = new SqlCommand())
                        {
                            comm.Connection = conn;
                            conn.Open();
                            for (int i = 1; i < bunifuCustomDataGrid2.Rows.Count; i++)
                            {
                           StrQuery = @"INSERT INTO concediati VALUES ("
                            + bunifuCustomDataGrid2.Rows[i].Cells["firstname"].ToString() + ", "
                             + bunifuCustomDataGrid2.Rows[i].Cells["lastname"].ToString() + ", "
                             + bunifuCustomDataGrid2.Rows[i].Cells["CARS"].ToString() + ", "
                             + bunifuCustomDataGrid2.Rows[i].Cells["RENT"].ToString() + ", "
                            + bunifuCustomDataGrid2.Rows[i].Cells["CLIENT"].ToString() + ");";
                        comm.CommandText = StrQuery;
                        comm.ExecuteNonQuery();
                            }
                        }
                    }
                }
                catch (Exception)
                {
                    throw;
                }

更新了參數。

string StrQuery;
            try
            {
                using (SqlConnection conn = new SqlConnection(stringcon))
                {
                    using (SqlCommand comm = new SqlCommand())
                    {
                        comm.Connection = conn;
                        conn.Open();
                        for (int i = 0; i < bunifuCustomDataGrid2.Rows.Count; i++)
                        {


                            StrQuery = @"INSERT INTO concediati(nume,prenume,idcar,idrent,idclient) VALUES (@name,@lastname,@car,@rent,@client)";
                            comm.Parameters.AddWithValue("@name", Convert.ToString(bunifuCustomDataGrid2.Rows[i].Cells["firstname"].ToString()));
                            comm.Parameters.AddWithValue("@lastname", Convert.ToString(bunifuCustomDataGrid2.Rows[i].Cells["lastname"].ToString()));
                            comm.Parameters.AddWithValue("@car", Convert.ToInt32(bunifuCustomDataGrid2.Rows[i].Cells["CARS"].ToString()));
                            comm.Parameters.AddWithValue("@rent", Convert.ToInt32(bunifuCustomDataGrid2.Rows[i].Cells["RENT"].ToString()));
                            comm.Parameters.AddWithValue("@client", Convert.ToInt32(bunifuCustomDataGrid2.Rows[i].Cells["CLIENT"].ToString()));



                            comm.CommandText = StrQuery;
                            comm.ExecuteNonQuery();
                        }
                    }
                }
            }
            catch (Exception)
            {
                throw;


}

現在，它給出了另一個錯誤：

System.FormatException：'輸入字符串的格式不正確。

圖片： capture1 capture25 capture25 capture25 capture5

表：

CREATE TABLE [dbo].[concediati] (
    [Id]       INT          IDENTITY (1, 1) NOT NULL,
    [nume]     VARCHAR (50) NULL,
    [prenume]  VARCHAR (50) NULL,
    [idclient] INT          NULL,
    [idrent]   INT          NULL,
    [idcar]    INT          NULL,
    PRIMARY KEY CLUSTERED ([Id] ASC)
);

Answer 1

bunifuCustomDataGrid2.Rows[i].Cells["firstname"].ToString())為您提供ToString方法的替代實現。 這意味着您沒有從上述代碼中獲得實際值。 您應該改用bunifuCustomDataGrid2.Rows[i].Cells["firstname"].Value 。

如果有幫助，請標記為已回答。

Answer 2

INSERT的文檔在表名和列列表之間顯示一個空格，因此最好遵循該空格。

另外，您可以在循環外創建一次參數，然后在循環中設置它們的值（否則，您需要在參數上調用.Clear（），並在每次迭代時重新創建它們）：

string sql = @"INSERT INTO concediati (nume, prenume, idcar, idrent, idclient) VALUES (@name, @lastname, @car, @rent, @client)";
using (SqlConnection conn = new SqlConnection(stringcon))
{
    using (SqlCommand comm = new SqlCommand(sql, conn))
    {
        comm.Parameters.Add(new SqlParameter { ParameterName = "@name", SqlDbType = SqlDbType.VarChar, Size = 50 });
        comm.Parameters.Add(new SqlParameter { ParameterName = "@lastname", SqlDbType = SqlDbType.VarChar, Size = 50 });
        comm.Parameters.Add(new SqlParameter { ParameterName = "@car", SqlDbType = SqlDbType.Int });
        comm.Parameters.Add(new SqlParameter { ParameterName = "@rent", SqlDbType = SqlDbType.Int });
        comm.Parameters.Add(new SqlParameter { ParameterName = "@client", SqlDbType = SqlDbType.Int });

        conn.Open();

        for (int i = 0; i < bunifuCustomDataGrid2.Rows.Count; i++)
        {
            string firstName = Convert.ToString(bunifuCustomDataGrid2.Rows[i].Cells["firstname"].Value);
            string lastName = Convert.ToString(bunifuCustomDataGrid2.Rows[i].Cells["lastname"].Value);
            int car = Convert.ToInt32(bunifuCustomDataGrid2.Rows[i].Cells["CARS"].Value);
            int rent = Convert.ToInt32(bunifuCustomDataGrid2.Rows[i].Cells["RENT"].Value);
            int client = Convert.ToInt32(bunifuCustomDataGrid2.Rows[i].Cells["CLIENT"].Value);

            comm.Parameters["@name"].Value = firstName;
            comm.Parameters["@lastname"].Value = lastName;
            comm.Parameters["@car"].Value = car;
            comm.Parameters["@rent"].Value = rent;
            comm.Parameters["@client"].Value = client;

            comm.ExecuteNonQuery();

        }
    }
}

Answer 3

我檢查了您的代碼並進行了更改。 您可以使用以下代碼。

 string StrQuery;
        try
        {
            using (SqlConnection conn = new SqlConnection(stringcon))
            {

                    for (int i = 0; i < bunifuCustomDataGrid2.Rows.Count; i++)
                    {
                        SqlCommand comm = new SqlCommand();
                        comm.Connection = conn;
                        StrQuery = @"INSERT INTO concediati(nume,prenume,idcar,idrent,idclient) VALUES (@name,@lastname,@car,@rent,@client)";
                        comm.Parameters.AddWithValue("@name", Convert.ToString(bunifuCustomDataGrid2.Rows[i].Cells["firstname"].ToString()));
                        comm.Parameters.AddWithValue("@lastname", Convert.ToString(bunifuCustomDataGrid2.Rows[i].Cells["lastname"].ToString()));
                        comm.Parameters.AddWithValue("@car", Convert.ToInt32(bunifuCustomDataGrid2.Rows[i].Cells["CARS"].ToString()));
                        comm.Parameters.AddWithValue("@rent", Convert.ToInt32(bunifuCustomDataGrid2.Rows[i].Cells["RENT"].ToString()));
                        comm.Parameters.AddWithValue("@client", Convert.ToInt32(bunifuCustomDataGrid2.Rows[i].Cells["CLIENT"].ToString()));

                        comm.CommandText = StrQuery;

                        conn.Open();
                        comm.ExecuteNonQuery();
                        conn.Close();

                    }
                }

        }
        catch (Exception ex)
        {
            throw;
        }