SQL查詢錯誤 - 「列不能爲空」

Question

我有一個SQL查詢：

String S = Editor1.Content.ToString(); 
    Response.Write(S);  
    string sql = "insert into testcase.ishan(nmae,orders) VALUES ('9',@S)"; 
    OdbcCommand cmd = new OdbcCommand(sql, myConn); 
      cmd.Parameters.AddWithValue("@S", S); 
      cmd.ExecuteNonQuery(); 

Error: Column 'orders' cannot be null at System.Data.Odbc.OdbcConnection.HandleError

Answer 1

從manual：

When CommandType is set to Text, the .NET Framework Data Provider for ODBC does not support passing named parameters to an SQL statement or to a stored procedure called by an OdbcCommand. In either of these cases, use the question mark (?) placeholder. For example:

SELECT * FROM Customers WHERE CustomerID = ? 

The order in which OdbcParameter objects are added to the OdbcParameterCollection must directly correspond to the position of the question mark placeholder for the parameter in the command text.

使用此：

string sql = "insert into testcase.ishan(nmae,orders) VALUES ('9', ?)"; 
OdbcCommand cmd = new OdbcCommand(sql, myConn); 
cmd.Parameters.AddWithValue("you_can_write_anything_here_its_ignored_anyway", S); 
cmd.ExecuteNonQuery(); 

Answer 2

這對你很有幫助

cmd.Parameters.Add("@S", OdbcType.Char, S);