c# - 如何在表格中添加多行？

Question

string date = p_text_data.Text;
string sql = @"INSERT INTO Warehouse (title,count,price,date) ";
try
{
    using (SqlConnection connection = ConnectToDataBase.GetConnection())
    {
        SqlCommand command = new SqlCommand(sql, connection);
        for (int i = 0; i < mdc.Count; i++)
        {
            sql += "SELECT @title" + i + ",@count" + i + ",@price" + i + ",@date" + i + " ";
            command.Parameters.AddWithValue("@title" + i, mdc[i].Title);
            command.Parameters.AddWithValue("@count" + i, mdc[i].Count);
            command.Parameters.AddWithValue("@price" + i, mdc[i].Price);
            command.Parameters.AddWithValue("@date" + i, Conver_Data(date));
            if (mdc.Count-1 != i)
                sql += "UNION ALL ";
        }
        sql += " ;";
        connection.Open();// *sql
        string id_Partner = command.ExecuteScalar().ToString();
    }
}
catch (SqlException se)
{
    MessageBox.Show(se.Message);
}

*sql = "INSERT INTO Warehouse (title,count,price,date) SELECT @title0,@count0,@price0,@date0 UNION ALL SELECT @title1,@count1,@price1,@date1 ;"

然后他飞了个异常(exception)

Incorrect syntax near ')'

clarify - count - int, price - double, date - 日期

我做错了什么？

编辑:表格

CREATE TABLE [dbo].[Warehouse] (
  [ID] int IDENTITY(1, 1) NOT NULL,
  [title] char(30) COLLATE Cyrillic_General_CI_AS NULL,
  [count] int NULL,
  [price] float NULL,
  [date] datetime NULL,
  CONSTRAINT [PK__Warehous__3214EC277F60ED59] PRIMARY KEY CLUSTERED ([ID])
)
ON [PRIMARY]
GO

我用过 SQL Server 2008

Answer 1

问题是您永远不会用“)”之后的任何内容更新 command 对象的 SQL 命令文本。仅仅因为您更新了 sql 变量并不意味着 SqlCommand 对象将看到该更新。

(您将遇到的另一个问题是您没有从此查询返回任何内容，因此您将无法使用 ExecuteScalar()。)

试试这个:

string date = p_text_data.Text; 
string sql = @"INSERT INTO Warehouse (title,count,price,date) "; 
try 
{ 
    using (SqlConnection connection = ConnectToDataBase.GetConnection()) 
    { 
        SqlCommand command = new SqlCommand(sql, connection); 
        for (int i = 0; i < mdc.Count; i++) 
        { 
            sql += "SELECT @title" + i + ",@count" + i + ",@price" + i + ",@date" + i + " "; 
            command.Parameters.AddWithValue("@title" + i, mdc[i].Title); 
            command.Parameters.AddWithValue("@count" + i, mdc[i].Count); 
            command.Parameters.AddWithValue("@price" + i, mdc[i].Price); 
            command.Parameters.AddWithValue("@date" + i, Conver_Data(date)); 
            if (mdc.Count-1 != i) 
                sql += "UNION ALL "; 
        } 
        sql += " ;"; 
        command.CommandText = sql;    //  Set your SQL Command to the whole statement.
        connection.Open();// *sql 
        command.ExecuteNonQuery();    //  Execute a query with no return value.
    } 
} 
catch (SqlException se) 
{ 
    MessageBox.Show(se.Message); 
}