Question

public bool location() 
{

    string OUI = "OUI";

    SqlConnection con = new SqlConnection(@"Data Source=WIN-218NC1F1FE2\SQLEXPRESS;Initial Catalog=projet;Integrated Security=True");
    con.Open();
    SqlCommand cmd = new SqlCommand("select max(id_reservation) from reservation");
    cmd.Connection = con;
    Int32 maxId = (Int32)cmd.ExecuteScalar();
    string v = Convert.ToString(maxId);
    //correct 


    SqlCommand q = new SqlCommand("insert into reservation(location) values('" + OUI + "') where id_reservation ='"+ maxId + "'", con);
    SqlDataReader da = q.ExecuteReader();
    return true ;
}

问题在命令中：关键字'where'附近的语法不正确。帮助!!!

Answer 1

where语句中不能包含insert子句。这就是它的全部。如果要插入，请删除where子句。如果您需要更新符合条件的记录，请不要使用insert，而是使用update。

此外，如果您对查询结果不是真的感兴趣，请不要使用ExecuteReader，而是使用ExecuteNonQuery。

Answer 2

Thorsten回答很清楚我只是为每个案例添加代码：

 SqlConnection con = new SqlConnection(@"Data Source=WIN-218NC1F1FE2\SQLEXPRESS;Initial Catalog=projet;Integrated Security=True");
    con.Open();
    SqlCommand cmd = new SqlCommand("select max(id_reservation) from reservation");
    cmd.Connection = con;
    Int32 maxId = (Int32)cmd.ExecuteScalar();  
     string ID=maxId.TOString();
    //correct 

 /////INSERT  
    SqlCommand q = new SqlCommand("insert into reservation(location) values(@location,@ID)", con);
          q.Parameters.AddWithValue( "@location",OUI);
          q.Parameters.AddWithValue("@ID",ID);
          q.ExecuteNonQuery(); 
          return true ;
////////UPDATE

     SqlCommand q = new SqlCommand("update  reservation set location=@location where id_reservation =@ID", con);
              q.Parameters.AddWithValue( "@location",OUI);
              q.Parameters.AddWithValue("@ID",ID);
              q.ExecuteNonQuery(); 
               return true ;

关键字'where'附近的语法不正确

2 个答案: