我有一个向表中插入一行的查询,该表有一个名为ID的字段,该字段是使用列上的AUTO_INCREMENT填充的。我需要为下一步的功能获取这个值,但是当我运行以下命令时,即使实际值不是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,但它每次都只返回0。有什么想法吗?
编辑:
当我运行时:
"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"}
发布于 2009-01-02 02:48:54
编辑:在引用last_insert_id()之前添加"select“
在插入之后运行"select last_insert_id();
“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提到的,使用参数化查询like this真的会为你提供很好的服务。
编辑:在您切换到参数化版本之前,您可能会发现string.Format很好用:
comm.CommandText = string.Format("{0} '{1}', {2}, {3}, {4}, {5}); select last_insert_id();",
insertInvoice, invoiceDate.ToString(...), bookFee, adminFee, totalFee, customerID);
发布于 2013-02-06 19:07:33
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
发布于 2011-10-28 19:38:30
使用LastInsertedId。
在这里查看我的建议和示例:http://livshitz.wordpress.com/2011/10/28/returning-last-inserted-id-in-c-using-mysql-db-provider/
https://stackoverflow.com/questions/405910
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