我在SQL Server Management Studio中运行了SQL查询,但它运行良好。
我的WinForm C#应用程序中出现以下错误
The parameterized query '(@word1 text)SELECT distinct [database].[dbo].[tableName].[n' expects the parameter '@word1', which was not supplied.
这是我的代码
private void buttonRunQuery_Click(object sender, EventArgs e)
{
if (connection == null)
{
connection = ConnectionStateToSQLServer();
SqlCommand command = new SqlCommand(null, connection);
command = createSQLQuery(command);
GetData(command);
}
else
{
SqlCommand command = new SqlCommand(null, connection);
command = createSQLQuery(command);
GetData(command);
}
}
private SqlCommand createSQLQuery(SqlCommand command)
{
string[] allTheseWords;
if (textBoxAllTheseWords.Text.Length > 0)
{
allTheseWords = textBoxAllTheseWords.Text.Split(' ');
string SQLQuery = "SELECT distinct [database].[dbo].[customerTable].[name], [database].[dbo].[customerTable].[dos], [database].[dbo].[customerTable].[accountID], [database].[dbo].[reportTable].[customerID], [database].[dbo].[reportTable].[accountID], [database].[dbo].[reportTable].[fullreport] FROM [database].[dbo].[reportTable], [database].[dbo].[customerTable] WHERE ";
int i = 1;
foreach (string word in allTheseWords)
{
var name = "@word" + (i++).ToString();
command.Parameters.Add(name, SqlDbType.Text);
//(name, SqlDbType.Text).Value = word;
SQLQuery = SQLQuery + String.Format(" [database].[dbo].[reportTable].[fullreport] LIKE {0} AND ", name);
}
SQLQuery = SQLQuery + " [database].[dbo].[customerTable].[accountID] = [database].[dbo].[reportTable].[accountID]";
command.CommandText = SQLQuery;
}
MessageBox.Show(command.CommandText.ToString());
return command;
}
public DataTable GetData(SqlCommand cmd)
{
//SqlConnection con = new SqlConnection(connString);
//SqlCommand cmd = new SqlCommand(sqlcmdString, cn);
SqlDataAdapter da = new SqlDataAdapter(cmd);
connection.Open();
DataTable dt = new DataTable();
da.Fill(dt);
connection.Close();
return dt;
}
错误发生在da.Fill(dt)
上任何建议都会有所帮助
谢谢
答案 0 :(得分:1)
On var name =“@ word”+(i ++)。ToString();只使用我,在其他地方增加。
答案 1 :(得分:1)
在您的示例中,您已注释掉设置参数值的行:
command.Parameters.Add(name, SqlDbType.Text);
//(name, SqlDbType.Text).Value = word;
如果没有为参数设置值,则会忽略它(并且不会存在)。 改为:
command.Parameters.AddWithValue(name, word);
为清楚起见,请考虑以下引用:
要添加的值。使用DBNull.Value而不是null来指示空值。