輸入參數的C＃MySQL的句法

Question

我試着輸入值，但@numVal所行不行（上線與ARR開始[10]）

using System; 
    using System.Collections.Generic; 
    using System.Linq; 
    using System.Text; 
    using MySql.Data.MySqlClient; 

    namespace ConsoleApplication2 
    { 
     class Program 
     { 
      static void Main(string[] args) 
      { 


       MySqlConnection conDatabase = new MySqlConnection("Data Source=localhost;" + 
              "Persist Security Info=yes;" + 
              "UserId=tee; PWD=t5794849; database=ph3;"); 
       conDatabase.Open(); 
       // MySqlCommand cmdDatabase = new MySqlCommand("DROP TABLE IF EXISTS `q_mem_sur`; create table q_mem_sur as SELECT Count(*) As rowa, member.Ssurname, Sum(Case When ((member.status = '1')) Then 1 Else 0 End) As Status11 From member Group By member.Ssurname Order By rowa Desc;", conDatabase); 


       Console.WriteLine("Enter username"); 
       string input = Console.ReadLine(); 

       try 
       { 
        int numVal = Convert.ToInt16(input); 
       } 
       catch (FormatException) 
       { 
        Console.WriteLine("Input string is not a sequence of digits."); 
       } 
       catch (OverflowException) 
       { 
        Console.WriteLine("The number cannot fit in an Int32."); 
       } 






       string[] arr = new string[11]; 
       arr[0] = "UPDATE `member` SET `amphurecode`= SUBSTRING(member.own,3,4)"; 
       arr[1] = "UPDATE `member` SET `provincecode`= SUBSTRING(member.own,3,2)"; 
       arr[2] = "DROP TABLE IF EXISTS `q_mem_tim`; create table q_mem_tim as SELECT member.idmember, member.own, member.provincecode, province.PROVINCE_NAME, member.amphurecode, amphur.AMPHUR_NAME, member.novote, member.Sname, member.Ssurname, member.Hno, member.Moo, member.Sex, member.tambol, member.dateofbirth, member.migratedate, Year(Current_Date()) - Year(member.dateofbirth) AS y, DATEDIFF('2011-08-01',(migratedate)) AS d FROM member LEFT JOIN amphur ON (member.amphurecode = amphur.AMPHUR_CODE) LEFT JOIN province ON member.provincecode = province.PROVINCE_CODE"; 
       arr[3] = "DROP TABLE IF EXISTS `q_mem_sur`; create table q_mem_sur as SELECT Count(*) As rowa, member.Ssurname, Sum(Case When ((member.status = '1')) Then 1 Else 0 End) As Status11 From member Group By member.Ssurname Order By rowa Desc"; 
       arr[4] = "DROP TABLE IF EXISTS `q_mem_hno` ; create table q_mem_hno as select member.Hno, member.Moo, member.tambol, COUNT(member.Hno) AS cntHno, COUNT(DISTINCT member.Ssurname) as NoSur FROM member GROUP BY member.Hno, member.Moo, member.tambol ORDER BY cntHno DESC "; 
       arr[5] = "DROP TABLE IF EXISTS `q_pro_ori`; create table q_pro_ori as Select member.provincecode, count(*) As cnt From member Group By member.provincecode Order By cnt Desc "; 
       arr[6] = "DROP TABLE IF EXISTS `q_am_ori`; create table q_am_ori as Select member.amphurecode, member.provincecode, count(*) As cnt From member Group By member.amphurecode, member.provincecode Order By cnt Desc "; 
       arr[7] = "DROP TABLE IF EXISTS `Sur_Hno_`; create table Sur_Hno_ as SELECT count(* ) , Ssurname, q_mem_tim.Hno, q_mem_tim.Moo, q_mem_tim.tambol FROM q_mem_tim GROUP BY q_mem_tim.Ssurname, q_mem_tim.Hno, q_mem_tim.Moo, q_mem_tim.tambol ORDER BY count(*) DESC"; 
       arr[8] = "DROP TABLE IF EXISTS `q_dup_own`; create table q_dup_own as SELECT Count(*) as n ,member.own FROM member GROUP BY member.own order by n DESC "; 
      // arr[9] = "drop table if exists q_mem_birth; create table q_mem_birth as SELECT member.idmember, member.own, member.provincecode, province.PROVINCE_NAME, member.amphurecode, amphur.AMPHUR_NAME, member.Sname, member.Ssurname, member.Hno, member.Moo, member.Sex, member.tambol, member.dateofbirth, member.migratedate, member.fathercode , member.mathercode, Year(Current_Date()) - Year(member.dateofbirth) AS y, DATEDIFF('2011-08-01',(migratedate)) AS d ,member.inputstaf FROM member LEFT JOIN amphur ON (member.amphurecode = amphur.AMPHUR_CODE) LEFT JOIN province ON member.provincecode = province.PROVINCE_CODE WHERE DAYOFYEAR(member.dateofbirth)-DAYOFYEAR(NOW()) < 30 and DAYOFYEAR(member.dateofbirth)-DAYOFYEAR(NOW()) > -1 order by DAYOFYEAR(member.dateofbirth)"; 
       arr[9] = "ALTER TABLE `q_mem_tim` ADD `agec` VARCHAR(10) NULL "; 
      // arr[10] = "UPDATE q_mem_birth SET agec = CASE WHEN y < 10 THEN 'ด' WHEN y > 10 and y < 20 and Sex='ญ' THEN 'วญ' WHEN y > 10 and y < 20 and Sex='ช' THEN 'วช' ELSE 'ผญ' END"; 
       arr[10] = "drop table if exists q_mem_birth; create table q_mem_birth as SELECT q_mem_tim.idmember,q_mem_tim.own,q_mem_tim.PROVINCE_NAME,q_mem_tim.AMPHUR_NAME,q_mem_tim.novote,q_mem_tim.Sname,q_mem_tim.Ssurname,q_mem_tim.Hno,q_mem_tim.Moo,q_mem_tim.Sex,q_mem_tim.tambol,q_mem_tim.dateofbirth,q_mem_tim.migratedate,q_mem_tim.y,q_mem_tim.d,q_mem_tim.agec FROM q_mem_tim where q_mem_tim.dateofbirth is not null and q_mem_tim.dateofbirth != '00000000' and day(q_mem_tim.dateofbirth) != '00' and day(q_mem_tim.dateofbirth) > 0 and day(q_mem_tim.dateofbirth) < 11 and month(q_mem_tim.dateofbirth) != '00' and month(q_mem_tim.dateofbirth) = @numVal order by tambol,Moo, month(dateofbirth),day(dateofbirth) "; 


       foreach (string s in arr) 
       { 
        Console.WriteLine(s); 
        MySqlCommand cmdDbase = new MySqlCommand((s), conDatabase); 
        cmdDbase.CommandTimeout = 500; 
        cmdDbase.ExecuteNonQuery(); 
       } 
       conDatabase.Close(); 
      } 

      } 
     } 

Answer 1

1）截斷表;不要刪除它們並重新制作它們，因爲當你刪除它們時，你必須做索引並再次添加主鍵。

using(var cm = _dbConnection.CreateCommand()) 
{ 
    cm.CommandText = @"Truncate Table Table"; 
    cm.CommandType = CommandType.Text; 
    cm.ExecuteNonQuery(); 
} 

2）不要忘記@符號;它與任何SQL幫助：

using(var cm = _dbConnection.CreateCommand()) 
    { 
     cm.CommandText = @"Select * 
          From table 
          Where Id = @Id"; 
     cm.CommandType = CommandType.Text; 
     cm.Parameter.AddWithValue("Id", id); 
     cm.ExecuteNonQuery(); 
    } 

我知道你不會做這種方式和你使用的字符串數組（只放一個foreach循環using語句外，用說明的cm.CommandText值字符串的值），但它的例子應該幫助你，或者至少給你一些想法。

Answer 2

您需要添加一個MySqlParameter名爲numVal命令。