一尘不染

使用C#获取插入行的ID

mysql

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,该字段在列上使用AUTO_INCREMENT填充。我需要为下一个功能获取此值,但是当我运行以下命令时,即使实际值不为0,它也总是返回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,但每次仅返回0。有任何想法吗?

编辑:

当我跑步时:

"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();"

我得到:

{"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"}

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2020-05-17

共1个答案

一尘不染

[编辑:在引用last_insert_id()之前添加了“选择”]

select last_insert_id();插入后运行“ ”怎么办?

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:
如duffymo所述,使用像这样的参数化查询确实可以很好地为您服务。


编辑: 在切换到参数化版本之前,您可能会发现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);
2020-05-17