使用C#获取插入行的id

Question

我有一个查询要在表中插入一行,该表有一个名为ID的字段,该字段使用列上的AUTO_INCREMENT填充.我需要为下一部分功能获取此值,但是当我运行以下操作时,即使实际值不为0,它也始终返回0:

MySqlCommand comm = connect.CreateCommand();
comm.CommandText = insertInvoice;
comm.CommandText += "\'" + invoiceDate.ToString("yyyy:MM:dd hh:mm:ss") + "\', " + bookFee + ", " + adminFee + ", " + totalFee + ", " + customerID +  ")";
int id = Convert.ToInt32(comm.ExecuteScalar());

根据我的理解,这应该返回ID列,但每次只返回0.有任何想法吗？

编辑:

当我跑:

"INSERT INTO INVOICE (INVOICE_DATE, BOOK_FEE, ADMIN_FEE, TOTAL_FEE, CUSTOMER_ID) VALUES ('2009:01:01 10:21:12', 50, 7, 57, 2134);last_insert_id();"

我明白了:

{"You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'last_insert_id()' at line 1"}

Answer 1

MySqlCommand comm = connect.CreateCommand();
comm.CommandText = insertStatement;  // Set the insert statement
comm.ExecuteNonQuery();              // Execute the command
long id = comm.LastInsertedId;       // Get the ID of the inserted item

Answer 2

[编辑:在引用last_insert_id()之前添加"select"]

select last_insert_id();插入后运行" " 怎么样？

MySqlCommand comm = connect.CreateCommand();
comm.CommandText = insertInvoice;
comm.CommandText += "\'" + invoiceDate.ToString("yyyy:MM:dd hh:mm:ss") + "\', "  
    + bookFee + ", " + adminFee + ", " + totalFee + ", " + customerID +  ");";
    + "select last_insert_id();"

int id = Convert.ToInt32(comm.ExecuteScalar());

编辑:正如duffymo所提到的,使用像这样的参数化查询你会得到很好的服务.

编辑:直到你切换到参数化版本,你可能会发现与string.Format和平:

comm.CommandText = string.Format("{0} '{1}', {2}, {3}, {4}, {5}); select last_insert_id();",
  insertInvoice, invoiceDate.ToString(...), bookFee, adminFee, totalFee, customerID);