下面是我在向数据库中插入数据后检索自动增量ID的代码。
但是,在将数据插入数据库之前,我得到了自动增量ID。
插入数据库后如何获得自动增量ID?
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
RetrievePRReqID();
}
}
//检索ID方法
private void RetrievePRReqID()
{
try
{
string query = "Select IDENT_CURRENT('tblPRRequest')";
if (sqlCon.State == ConnectionState.Closed)
{
sqlCon.Open();
}
SqlCommand cmd = new SqlCommand(query, sqlCon);
SqlDataReader reader = cmd.ExecuteReader();
while(reader.Read())
{
int value = int.Parse(reader[0].ToString()) ;
txt_PRNO.Text = value.ToString();
}
}
catch(Exception)
{
throw;
}
finally
{
if(con.State == ConnectionState.Open)
{
con.Close();
}
}
}
//请求按钮方法
protected void btn_Request(object sender, EventArgs e)
{
string insertCmd = "INSERT INTO tblPRRequest (RequestTo,RequestFrom,RequestedByName) " +
"VALUES (@RequestTo,@RequestFrom,@RequestedByName)";
using (SqlConnection conn = new SqlConnection(cs))
{
conn.Open();
using (SqlCommand sqlcmd = new SqlCommand(insertCmd, conn))
{
sqlcmd.Parameters.Clear();
SqlCommand sqlCmd = new SqlCommand(insertCmd, sqlCon);
sqlcmd.Parameters.AddWithValue("@RequestTo", lblPurchasingDept.Text);
sqlcmd.Parameters.AddWithValue("@RequestFrom", ddlDept.SelectedItem.Text);
sqlcmd.Parameters.AddWithValue("@RequestedByName", SUserName.Text);
sqlcmd.ExecuteNonQuery();
}
}
***//After Insert into the table, I want to retrieve latest generated Auto Increment ID in here.***
}
通过引用@ Mx.Wolf的示例答案,我做了一些修改以获得正确的答案,下面是正在运行的代码:
protected void btn_Request(object sender, EventArgs e)
{
object id ;
string insertCmd = "INSERT INTO tblPRRequest (RequestTo,RequestFrom,RequestedByName) " +
"output inserted.PRReqID " +
"VALUES (@RequestTo,@RequestFrom,@RequestedByName)";
using (SqlConnection conn = new SqlConnection(cs))
{
conn.Open();
using (SqlCommand sqlcmd = new SqlCommand(insertCmd, conn))
{
sqlcmd.Parameters.AddWithValue("@RequestTo", lblPurchasingDept.Text);
sqlcmd.Parameters.AddWithValue("@RequestFrom", ddlDept.SelectedItem.Text);
sqlcmd.Parameters.AddWithValue("@RequestedByName", SUserName.Text);
id = sqlcmd.ExecuteScalar(); //the result is of Object type, cast it safely
}
}
Debug.WriteLine(id.ToString()); // Access it like this
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