Question

尝试在我的代码中更新用户信息时出现此错误...

ErrorSystem.Data.OleDb.OleDbException（0x80040E14）：语法错误更新声明。在 System.Data.OleDb.OleDbCommand.ExecuteCommandTextErrorHandling（OleDbHResult hr）at System.Data.OleDb.OleDbCommand.ExecuteCommandTextForSingleResult（tagDBPARAMS dbParams，Object＆amp; executeResult）at System.Data.OleDb.OleDbCommand.ExecuteCommandText（对象＆安培; executeResult）at System.Data.OleDb.OleDbCommand.ExecuteCommand（的CommandBehavior 行为，对象＆amp; executeResult）at System.Data.OleDb.OleDbCommand.ExecuteReaderInternal（的CommandBehavior 行为，String方法）at System.Data.OleDb.OleDbCommand.ExecuteNonQuery（）at clsDataLayer.UpdateUser（String userName，String favProgram，String City，String leastFav，String State，DateTime Date，Int32 userID1）in c：\ Users \ John Vinson \ Documents \ Visual Studio 2015 \ WebSites \ ProgramAnonymous \ App_Code \ clsDataLayer.cs：第56行 useraccount_details.updateinfo_Click（Object sender，EventArgs e）in c：\ Users \ John Vinson \ Documents \ Visual Studio 2015 \ WebSites \ ProgramAnonymous \ useraccount_details.aspx.cs：第57行

这是代码......

public void UpdateUser(string userName, string favProgram, string City, string leastFav,
        string State, DateTime Date, int userID1)
    {
        dbConnection.Open();

        string sqlStmt = "UPDATE users SET userName = @username1, " +
            "favProgram = @favprogram1, " +
            "city = @city1, " +
            "state = @state1, " +
            "leastFavProgram = @leastfavprogram, " +
            "dateComplete = @datecomplete, " +
            "WHERE (users.userID = @id)";

        OleDbCommand dbCommand = new OleDbCommand(sqlStmt, dbConnection);

        OleDbParameter param = new OleDbParameter("@username1", userName);
        dbCommand.Parameters.Add(param);

        dbCommand.Parameters.Add(new OleDbParameter("@favprogram1", favProgram));
        dbCommand.Parameters.Add(new OleDbParameter("@city1", City));
        dbCommand.Parameters.Add(new OleDbParameter("@state1", State));
        dbCommand.Parameters.Add(new OleDbParameter("@leastfavprogram", leastFav));
        dbCommand.Parameters.Add(new OleDbParameter("@datecomplete", Date));
        dbCommand.Parameters.Add(new OleDbParameter("@id", userID1));

        dbCommand.ExecuteNonQuery();

        dbConnection.Close();

    }

Answer 1

为了避免这样讨厌的语法错误，不要从块中构建（连接）查询，使用 verbatim 字符串将查询设置为单，可读字符串：

    string sqlStmt = 
      @"UPDATE users
           SET userName = @username1,
               favProgram = @favprogram1,
               city = @city1,
               leastFavProgram = @leastfavprogram,
               dateComplete = @datecomplete -- <- no comma ',' should be here
         WHERE (users.userID = @id)";

有一个简单的开发过程：打开SQL编辑器，编写正确的查询然后将其（复制+粘贴）放入@""

试图发现语法错误

1 个答案: