我有一个 csv 文件,我将它插入到 gridview,然后显示它。之后,我需要将它存储到数据库中,所有来自 gridview 的记录。
因此,在单击按钮时,我使用以下代码:
using (SqlConnection scn = new SqlConnection("Data Source=(local); Database='WaselProject'; Integrated Security = yes;"))
{
scn.Open();
string query = "INSERT INTO Wasel_Card (RECORD, CARD_ID, FULL_NAME, SERVICE_ID, PROC_COUNT, READ_COUNT) VALUES (@record, @cardid, @fullname, @serviceid, @proccount, @readcount)";
using (SqlCommand scm = new SqlCommand(query, scn))
{
for (int i = 0; i < dataGridView1.Rows.Count; i++)
{
scm.Parameters.AddWithValue("@record", dataGridView1.Rows[i].Cells["Record"].Value.ToString());
scm.Parameters.AddWithValue("@cardid", dataGridView1.Rows[i].Cells["CARD_ID"].Value.ToString());
scm.Parameters.AddWithValue("@fullname", dataGridView1.Rows[i].Cells["FULL_NAME"].Value.ToString());
scm.Parameters.AddWithValue("@serviceid", dataGridView1.Rows[i].Cells["SERVICE_ID"].Value.ToString());
scm.Parameters.AddWithValue("@proccount", dataGridView1.Rows[i].Cells["PROC_COUNT"].Value.ToString());
scm.Parameters.AddWithValue("@readcount", dataGridView1.Rows[i].Cells["READ_COUNT"].Value.ToString());
scm.ExecuteNonQuery();
}
}
}
但是我得到一个错误:
Additional information: The variable name '@record' has already been declared. Variable names must be unique within a query batch or stored procedure.
有什么帮助吗?
提前致谢。
最佳答案
您的问题是您一直在循环内定义参数,显然不能为同一命令多次定义相同的参数。解决问题的两种方法。
方法一
在循环内对您的参数调用 Clear()
。
for (int i = 0; i < dataGridView1.Rows.Count; i++)
{
scm.Parameters.AddWithValue("@record", dataGridView1.Rows[i].Cells["Record"].Value.ToString());
scm.Parameters.AddWithValue("@cardid", dataGridView1.Rows[i].Cells["CARD_ID"].Value.ToString());
scm.Parameters.AddWithValue("@fullname", dataGridView1.Rows[i].Cells["FULL_NAME"].Value.ToString());
scm.Parameters.AddWithValue("@serviceid", dataGridView1.Rows[i].Cells["SERVICE_ID"].Value.ToString());
scm.Parameters.AddWithValue("@proccount", dataGridView1.Rows[i].Cells["PROC_COUNT"].Value.ToString());
scm.Parameters.AddWithValue("@readcount", dataGridView1.Rows[i].Cells["READ_COUNT"].Value.ToString());
scm.ExecuteNonQuery();
scm.Parameters.Clear();
}
方法二
只在循环内添加值,但在循环外声明一次参数。
// Define here just once
var paramRecord = scm.Parameters.Add("@record", System.Data.SqlDbType.Variant ); // There are 6 Add methods in total. 5 of them return SqlParameter so you can use any of those 5
// the other parameters
for (int i = 0; i < dataGridView1.Rows.Count; i++)
{
paramRecord.Value = dataGridView1.Rows[i].Cells["Record"].Value.ToString());
// other parameter values here
scm.ExecuteNonQuery();
}
关于c# - 如何从 gridview 将多条记录添加到 SQL Server 表中?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41194609/