Question

我调用了这个方法，结果只显示了前四个表的访问文件，并且错误信息出现在try-catch的消息框中。在添加table6，table7和一些键之前，这个方法还可以。有什么解决方案吗？

public void createStockAccess()
{
    ADOX.Catalog cat = new ADOX.Catalog();
    ADOX.Table table = new ADOX.Table();
    ADOX.Table table2 = new ADOX.Table();
    ADOX.Table table3 = new ADOX.Table();
    ADOX.Table table4 = new ADOX.Table();
    ADOX.Table table5 = new ADOX.Table();
    ADOX.Table table6 = new ADOX.Table();
    ADOX.Table table7 = new ADOX.Table();
    //Create the table and it's fields. 
    table.Name = "Gold";
    table.Columns.Append("Weight", ADOX.DataTypeEnum.adDouble);
    table.Columns.Append("DollarPerGram", ADOX.DataTypeEnum.adCurrency);

    table2.Name = "Diamond";
    table2.Columns.Append("Size", ADOX.DataTypeEnum.adVarWChar, 4);
    table2.Columns.Append("Quantity", ADOX.DataTypeEnum.adInteger, 4);
    table2.Columns.Append("Carat", ADOX.DataTypeEnum.adDouble);
    table2.Columns.Append("DollarPerCarat", ADOX.DataTypeEnum.adCurrency);
    table2.Keys.Append("DiamondPK", KeyTypeEnum.adKeyPrimary, "Size");

    table3.Name = "Parts";
    table3.Columns.Append("Number", ADOX.DataTypeEnum.adVarWChar, 10);
    table3.Columns.Append("Weight", ADOX.DataTypeEnum.adDouble);
    table3.Columns.Append("DollarPerGram", ADOX.DataTypeEnum.adCurrency);
    table3.Keys.Append("PartsPK", KeyTypeEnum.adKeyPrimary, "Number");

    table4.Name = "Jewel";
    table4.Columns.Append("Number", ADOX.DataTypeEnum.adVarWChar, 9);
    table4.Columns.Append("TypeNumber", ADOX.DataTypeEnum.adVarWChar, 10);
    table4.Columns.Append("Manufacturer", ADOX.DataTypeEnum.adVarWChar, 30);
    table4.Columns.Append("ManuCost", ADOX.DataTypeEnum.adCurrency);
    table4.Columns.Append("Price", ADOX.DataTypeEnum.adCurrency);
    table4.Columns.Append("GoldColor", ADOX.DataTypeEnum.adVarWChar, 10);
    table4.Columns.Append("GoldCarat", ADOX.DataTypeEnum.adVarWChar, 3);
    table4.Columns.Append("GoldWeight", ADOX.DataTypeEnum.adDouble);
    table4.Columns.Append("Type", ADOX.DataTypeEnum.adVarWChar, 20);
    table4.Columns.Append("Cost", ADOX.DataTypeEnum.adCurrency);
    table4.Columns.Append("Status", ADOX.DataTypeEnum.adVarWChar, 15);
    table4.Columns["Manufacturer"].Attributes = ColumnAttributesEnum.adColNullable;
    table4.Columns["ManuCost"].Attributes = ColumnAttributesEnum.adColNullable;
    table4.Columns["GoldCarat"].Attributes = ColumnAttributesEnum.adColNullable;
    table4.Columns["GoldWeight"].Attributes = ColumnAttributesEnum.adColNullable;
    table4.Columns["Cost"].Attributes = ColumnAttributesEnum.adColNullable;
    table4.Keys.Append("PrimaryKey", KeyTypeEnum.adKeyPrimary, "Number", "JewelDiamond", "Number");            

    table5.Name = "JewelDiamond";
    table5.Columns.Append("Number", ADOX.DataTypeEnum.adVarWChar, 9);
    table5.Columns.Append("Size", ADOX.DataTypeEnum.adVarWChar, 4);
    table5.Columns.Append("Quantity", ADOX.DataTypeEnum.adInteger, 4);
    table5.Columns.Append("Carat", ADOX.DataTypeEnum.adDouble);
    table5.Columns.Append("Type", ADOX.DataTypeEnum.adVarWChar, 20);
    table5.Keys.Append("PrimaryKeyJD", KeyTypeEnum.adKeyPrimary, "Number");
    table5.Keys["PrimaryKeyJD"].Columns.Append("Size", ADOX.DataTypeEnum.adVarWChar, 4);
    table5.Keys.Append("ForeignKeyJD", KeyTypeEnum.adKeyForeign, "Number", "Jewel", "Number");

    table6.Name = "Type";
    table6.Columns.Append("TypeNumber", ADOX.DataTypeEnum.adVarWChar, 10);
    table6.Columns.Append("Picture", ADOX.DataTypeEnum.adVarWChar, 150);
    table6.Columns["Picture"].Attributes = ColumnAttributesEnum.adColNullable;
    table6.Keys.Append("typePK", KeyTypeEnum.adKeyPrimary, "TypeNumber");

    table7.Name = "TypeInfo";
    table7.Columns.Append("TypeNumber", ADOX.DataTypeEnum.adVarWChar, 10);
    table7.Columns.Append("Size", ADOX.DataTypeEnum.adVarWChar, 4);
    table7.Columns.Append("Quantity", ADOX.DataTypeEnum.adDouble);
    table7.Keys.Append("infoPK", KeyTypeEnum.adKeyPrimary, "TypeNumber");
    table7.Keys["infoPK"].Columns.Append("Size", ADOX.DataTypeEnum.adVarWChar, 4);
    table7.Keys.Append("infoFK", KeyTypeEnum.adKeyForeign, "TypeNumber", "Type", "TypeNumber");

    table4.Keys.Append("ForeignKey", KeyTypeEnum.adKeyForeign, "TypeNumber", "Type", "TypeNumber");
    try
    {
        cat.Create("Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=Stock.mdb; Jet OLEDB:Engine Type=5");
        cat.Tables.Append(table);
        cat.Tables.Append(table2);
        cat.Tables.Append(table3);
        cat.Tables.Append(table4);
        cat.Tables.Append(table5);
        cat.Tables.Append(table6);
        cat.Tables.Append(table7);
        //Now Close the database
        Interop.Adodb.Connection con = cat.ActiveConnection as Interop.Adodb.Connection;
        if (con != null)
            con.Close();
    }
    catch (Exception ex)
    {
        MessageBox.Show("cannot create stock database.");
    }
    cat = null;
}

Answer 1

始终在错误捕获时提供异常消息和堆栈跟踪 - 这是问题解决方案的关键。

我猜，最可能的问题是以下代码行：

table4.Keys.Append("PrimaryKey", KeyTypeEnum.adKeyPrimary, "Number", "JewelDiamond", "Number");

添加主键并定义相关的表和列。也许，你复制代码时就错过了这个。

应该是：

table4.Keys.Append("PrimaryKey", KeyTypeEnum.adKeyPrimary, "Number");

无法在C＃中创建Access文件

1 个答案: