Question

string updateIncomeData = @"INSERT INTO TEAM_FUNDS_DETAILS("
   + "COMPONENT_TYPE,COMPONENT_NAME,COMPONENT_AMOUNT, YEAR_FOR, MONTH_FOR)"
   + "VALUES(" + Convert.ToInt32(TeamFundDetailsEnumClass.ComponentType.Income) 
   + " , ?, ?," 
   + ddlYear.SelectedIndex + ", " + ddlMonth.SelectedIndex + ")"

这个参数化查询给了我一个异常，告诉我“？”附近有错误。什么是错误。请更正。

Answer 1

我纯粹猜测，但它应该是year.selecteditem？没选择指数？

Answer 2

我不明白你为什么要混淆参数替换。

将所有五列指定为参数并以此方式设置值。

"INSERT INTO TEAM_FUNDS_DETAILS " +
"(COMPONENT_TYPE,COMPONENT_NAME,COMPONENT_AMOUNT, YEAR_FOR, MONTH_FOR) " +
"VALUES(? , ?, ?,?, ?)"

Answer 3

您必须设置参数化值（带问号的值）。这是VB.NET中的一个类似示例：

' Make a Command for this connection
' and this transaction.
Dim cmd As New OleDb.OleDbCommand( _
    "SELECT * FROM People WHERE FirstName=? AND " & _
        "LastName=?", _
    connUsers)

' Create parameters for the query.
cmd.Parameters.Add(New _
    OleDb.OleDbParameter("FirstName", first_name))
cmd.Parameters.Add(New OleDb.OleDbParameter("LastName", _
    last_name))

如果您不想使用参数化查询，只需将问号替换为默认值，或将变量替换为值：

string updateIncomeData = @"INSERT INTO TEAM_FUNDS_DETAILS("
   + "COMPONENT_TYPE,COMPONENT_NAME,COMPONENT_AMOUNT, YEAR_FOR, MONTH_FOR)"
   + "VALUES(" + Convert.ToInt32(TeamFundDetailsEnumClass.ComponentType.Income) 
   + " , '', 0," 
   + ddlYear.SelectedIndex + ", " + ddlMonth.SelectedIndex + ")"

或

string updateIncomeData = @"INSERT INTO TEAM_FUNDS_DETAILS("
   + "COMPONENT_TYPE,COMPONENT_NAME,COMPONENT_AMOUNT, YEAR_FOR, MONTH_FOR)"
   + "VALUES(" + Convert.ToInt32(TeamFundDetailsEnumClass.ComponentType.Income) 
   + " , '" + myComponentName + "', " + myComponentAmount," 
   + ddlYear.SelectedIndex + ", " + ddlMonth.SelectedIndex + ")"

Answer 4

ddlMonth.SelectedItem.Value

为什么这个查询会给我一个例外？

4 个答案: