MySQL带有参数的选择查询 [英] MySQL select query with parameter

问题描述

我正在尝试通过c#使用MYSQL选择查询.

I am trying to use MYSQL select query with c#.

以下用于搜索"ID"的查询工作正常:

Following query for searching "ID" is working fine:

conn = new MySqlConnection(cs);
conn.Open();
cmd = conn.CreateCommand();
cmd.CommandText = "select * from catalog_product_entity where entity_id = ?Id";
MySqlDataAdapter adp = new MySqlDataAdapter(cmd);
cmd.Parameters.Add("?Id", SqlDbType.Text).Value = ProductList[i].ProductId.ToString();
adp.Fill(MagentoProduct);

现在，我想在表中搜索确切的字符串值.我正在使用以下代码，其结果为空:

Now, I want to search exact string value in table. I am using following code and its giving empty result:

我的代码:

                            conn = new MySqlConnection(cs);
                            conn.Open();
                            cmd = new MySqlCommand("select * from catalog_category_entity_varchar where value = @Value;", conn);
                            cmd.Parameters.AddWithValue("@Value", "Storybooks");
                            MySqlDataReader r = cmd.ExecuteReader();

                            while (r.Read())
                            {
                                log.WriteEntry(r.GetString("value"));
                            }

推荐答案

您可以尝试使用SQL Reader

You could try SQL Reader

c = new MySqlCommand("select * from catalog_product_entity where column_nam = @Value;", conn);
c.Parameters.AddWithValue("@Value", your string);
MySqlDataReader r = c.ExecuteReader();

，然后使用Reader方法，例如reader.GetString("column_name")，....

and then use Reader methods like reader.GetString("column_name"), ....

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