Question

我使用newxt查询插入到表中，但我不知道语法是什么用于告诉我需要插入的查询，其中training_id =＆amp; dateSelected＆amp; ，下面的查询通过使用静态值来测试（2）。

请帮忙。

private void InsertInfo()
    {
        var dateSelected = dpDate.SelectedItem.Value;
        SqlConnection conn = new SqlConnection(GetConnectionString());

    string sql =    "INSERT INTO personTraining (name,training_id, training,trainingDate,trainingHour, trainingSession)SELECT @Val1,training_id,training,trainingDate,trainingHour,trainingSession FROM tbl_training WHERE  training_id = 2";

Answer 1

使用如下参数：

private void InsertInfo()
{
  var dateSelected = dpDate.SelectedItem.Value;
  using(SqlConnection conn = new SqlConnection(GetConnectionString()))
  {
       conn.Open();
       SqlCommand command= conn.CreateCommand();
       command.CommandText=     "INSERT INTO personTraining (name,training_id, training,trainingDate,trainingHour, trainingSession)SELECT @Val1,training_id,training,trainingDate,trainingHour,trainingSession FROM tbl_training WHERE  training_id = @trainingID";

      command.Parameters.AddWithValue("@trainingID",dateSelected);
      command.ExecuteNonQuery();
}

但是，您的查询中还有另一个@Val1参数;我不知道它来自哪里。

Answer 2

这是一个基本的例子。我不知道您是如何执行string sql所以我将使用基于SqlCommand的示例。

SQL：

INSERT INTO personTraining 
(name,training_id, training,trainingDate,trainingHour, trainingSession)
SELECT @Val1,training_id,training,trainingDate,trainingHour,trainingSession
FROM tbl_training 
WHERE training_id = @training_id;

C＃：

SqlCommand cmd = conn.CreateCommand();
cmd.Parameters.AddWithValue("training_id", dateSelected);

Answer 3

将另一个Parameter对象添加到SqlCommand对象，并将Parameter的值设置为dateSelected。

将选定的下拉列表值传递给where子句

3 个答案: