sql - 如何在sql查询中传递整数变量

Question

int no = FormView1.PageIndex;

询问：-

  SqlCommand cmd =  new SqlCommand("select Answer from Questions where QuestionNo = @no", cn);

Answer 1

您必须添加一个参数：

int no = FormView1.PageIndex;
SqlCommand cmd = 
    new SqlCommand("select Answer from Questions where QuestionNo = @no", cn);

// Set the parameter up before executing the command
cmd.Parameters.Add("@no", SqlDbType.Int);
cmd.Parameters["@no"].Value = no;

Answer 2

您需要添加SqlParameter一个SqlCommand：

int no = FormView1.PageIndex;
SqlCommand cmd = new SqlCommand("select Answer from Questions where QuestionNo = @no", cn);
cmd.Parameters.AddWithValue("@no", no);

Answer 3

Use SqlParameters. See the example below.

http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.parameters.aspx

Answer 4

使用 System.Data.SqlClient.SqlParameter 数组

SqlCommand cmd(...);
SqlParameter[] inQueryParameters = ...;
cmd.Parameters.AddRange(inQueryParameters);

Answer 5

您可以使用以下代码：

SqlCommand ageCom = new SqlCommand("select age_phase from PatintInfo where patient_ID=@ptn_id", con);
ageCom.Parameters.Add("@ptn_id",SqlDbType.Int).Value=Convert.ToInt32(TextBox1.Text);

它在我的程序中正常工作。