mysql - 如何使用变量从 MySql 查询获取数据集

Question

我有一个这样的查询:

SET @a = (SELECT GROUP_CONCAT(Id) FROM MyTable1 WHERE Id < 10);
SELECT * FROM MyTable2  WHERE find_in_set(IdLite, @a); 
SELECT * FROM MyTable3  WHERE find_in_set(IdLite, @a);
SELECT * FROM MyTable4  WHERE find_in_set(IdLite, @a); 

我尝试使用此代码来获取结果:

Using ds As DataSet = MySqlHelper.ExecuteDataset(CnStr, SqlStr)

但我收到错误:

Fatal error encountered during command execution.

错误消息是:

Parameter '@a' must be defined.

我也尝试过:

SELECT * FROM MyTable2  WHERE find_in_set(IdLite, 
     @a := (SELECT GROUP_CONCAT(Id) FROM MyTable1 WHERE Id < 10)); 
SELECT * FROM MyTable3  WHERE find_in_set(IdLite, @a);
SELECT * FROM MyTable4  WHERE find_in_set(IdLite, @a); 

但我遇到了同样的错误。
将结果放入 DataSet 的正确方法是什么？

Answer 1

 DataSet mydataset =  new DataSet();
 MySqlConnection myConnection = new MySqlConnection();
 myConnection.ConnectionString = "************";
 myConnection.Open();
 string mySelectQuery = "SELECT * FROM table";
 MySqlCommand myCommand = new MySqlCommand(mySelectQuery,myConnection);
 MySqlDataAdapter adapter = new MySqlDataAdapter(myCommand);
 adapter.Fill(mydataset, "table");
 dataGridView1.DataSource = mydataset;
 dataGridView1.DataMember = "table";
 myConnection.Close();

您可以查看以下链接:

http://forums.codeguru.com/showthread.php?448008-How-do-i-load-mysql-data-into-a-dataset-then-into-a-datagrid

http://www.dotnetheaven.com/article/how-to-load-data-from-database-into-datagridview-in-vb.net

如果我的答案是正确的，请标记为正确。谢谢