Question

我的sql语句如下 insert语句只能起作用更新和删除语句不起作用

Purchase_InvoiceNo是Purchase表的主键列我得到这样的值，并将其值插入PurchaseProduct表 “SELECT IDENT_CURRENT（'Purchase'）AS [Purchase_InvoiceNo]”

        string deletecmd_PurchaseProduct =
            @"DELETE FROM PurchaseProduct " +
            "PurchaseProduct_No=@PurchaseProduct_No and "+
            "Purchase_InvoiceNo=@Purchase_InvoiceNo ";

        string updatcmd_PurchaseProduct =
            "UPDATE PurchaseProduct "
        + "  SET    "
        + "  PurchaseProduct_SerialNo =@PurchaseProduct_SerialNo"
        + ", Purchase_InvoiceNo =@Purchase_InvoiceNo"
        + ", ProductNo =@ProductNo"
        + " PurchaseProduct_Quantity =@PurchaseProduct_Quantity "
        + ", PurchaseProduct_Unit =@PurchaseProduct_Unit"
        + ", PurchaseProduct_Price =@PurchaseProduct_Price"
        + " Where "
        + " PurchaseProduct_No=@PurchaseProduct_No";



        string insertcmd_PurchaseProduct = "INSERT INTO PurchaseProduct" +
                           "(" +
                           " PurchaseProduct_SerialNo"+
                           ",Purchase_InvoiceNo" +
                           ",ProductNo" +
                           ",PurchaseProduct_Quantity " +
                           ",PurchaseProduct_Price" +
                           ",PurchaseProduct_Unit" +    //6
                           ")" +
                            "Values" +
                           "(" +
                           " @PurchaseProduct_SerialNo"+
                           ",@Purchase_InvoiceNo" +
                           ",@ProductNo " +
                           ",@PurchaseProduct_Quantity " +
                           ",@PurchaseProduct_Price" +
                           ",@PurchaseProduct_Unit" +       //6
                           ");";

Answer 1

您的删除命令似乎不完整：

string deletecmd_PurchaseProduct =
            @"DELETE FROM PurchaseProduct " +
            "PurchaseProduct_No=@PurchaseProduct_No and "+
            "Purchase_InvoiceNo=@Purchase_InvoiceNo ";

应该是：

string deletecmd_PurchaseProduct =
            @"DELETE FROM PurchaseProduct WHERE" +
            "PurchaseProduct_No=@PurchaseProduct_No and "+
            "Purchase_InvoiceNo=@Purchase_InvoiceNo ";

~~除非您插入重复的主键值，或者您没有将数据插入到没有默认值的非可空字段中，否则我无法理解为什么INSERT会失败。~~

    string updatcmd_PurchaseProduct =
      "UPDATE PurchaseProduct "
    + "SET    PurchaseProduct_SerialNo = @PurchaseProduct_SerialNo, "
    + "Purchase_InvoiceNo = @Purchase_InvoiceNo, "
    + "ProductNo = @ProductNo, "
    + "PurchaseProduct_Quantity = @PurchaseProduct_Quantity, "
    + "PurchaseProduct_Unit = @PurchaseProduct_Unit, "
    + "PurchaseProduct_Price = @PurchaseProduct_Price "
    + "Where PurchaseProduct_No = @PurchaseProduct_No";

上面有一个丢失的逗号。

DataAdapter.Update（）无法更新

1 个答案: