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我想創建一個數據庫與兩個表。我想在其中之一添加一個外鍵。 但下面的代碼不工作,我調試它,我發現唯一的問題是添加外鍵。如何添加外鍵訪問表使用adox
private static bool creatDatabase()
{
bool result = false;
Catalog cat = new Catalog();
Table tableCustomer = new Table();
Table tableAddresses = new Table();
//Create the table Customer and it's fields.
tableCustomer.Name = "Customer";
tableCustomer.Columns.Append("Customer_ID", ADOX.DataTypeEnum.adInteger);
tableCustomer.Keys.Append("PrimaryKEy", KeyTypeEnum.adKeyPrimary, "Customer_ID");
tableCustomer.Columns.Append("Name", ADOX.DataTypeEnum.adVarWChar, 50);
tableCustomer.Columns.Append("Email", ADOX.DataTypeEnum.adVarWChar, 50);
tableCustomer.Columns.Append("TelNumber", ADOX.DataTypeEnum.adVarWChar, 32);
tableCustomer.Columns.Append("Fax", ADOX.DataTypeEnum.adVarWChar, 32);
tableCustomer.Columns.Append("Street", ADOX.DataTypeEnum.adVarWChar, 50);
tableCustomer.Columns.Append("PostalCode", ADOX.DataTypeEnum.adInteger, 10);
tableCustomer.Columns.Append("City", ADOX.DataTypeEnum.adVarWChar, 50);
tableCustomer.Columns.Append("AdressCounter", ADOX.DataTypeEnum.adSmallInt);
tableAddresses.Name = "Addresses";
tableAddresses.Columns.Append("Address_ID", ADOX.DataTypeEnum.adInteger);
tableAddresses.Keys.Append("PrimaryKEy", KeyTypeEnum.adKeyPrimary, "Address_ID");
//tableAddresses.Columns.Append("Customer_ID", ADOX.DataTypeEnum.adInteger);
//tableAddresses.Keys.Append("ForeignKey", KeyTypeEnum.adKeyForeign, "Customer_ID"); ---> here is the Exception
tableAddresses.Columns.Append("Street", ADOX.DataTypeEnum.adVarWChar, 50);
tableAddresses.Columns.Append("PostalCode", ADOX.DataTypeEnum.adInteger, 10);
tableAddresses.Columns.Append("City", ADOX.DataTypeEnum.adVarWChar, 50);
try
{
cat.Create("Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + Application.StartupPath + "\\Customers.mdb" + "; Jet OLEDB:Engine Type=5");
cat.Tables.Append(tableCustomer);
cat.Tables.Append(tableAddresses);
//Now Close the database
ADODB.Connection con = cat.ActiveConnection as ADODB.Connection;
if (con != null)
con.Close();
result = true;
}
catch (Exception ex)
{
result = false;
}
finally
{
if (!result)
{
ADODB.Connection con = cat.ActiveConnection as ADODB.Connection;
if (con != null)
con.Close();
File.Delete(Application.StartupPath + "\\Customers.accdb");
}
}
cat = null;
return result;
}
,如果我嘗試類似以下antoher方法(在上梅索德創建後打開數據庫),它沒有太多的工作:
private static bool addForeignKey()
{
bool retValue = true;
ADODB.Connection con = new Connection();
Key kyForeign = new Key();
Catalog cat = new Catalog();
kyForeign.Name = "test";
kyForeign.Type = KeyTypeEnum.adKeyForeign;
kyForeign.RelatedTable = "Customer";
kyForeign.Columns.Append("CustomerID", ADOX.DataTypeEnum.adInteger);
kyForeign.Columns["CustomerID"].RelatedColumn = "Customer_ID";
try
{
con.Open("Provider='Microsoft.JET.OLEDB.4.0';Data source ='"
+ Application.StartupPath + "\\Customers.mdb';");
cat.ActiveConnection = con;
cat.Tables["Addresses"].Keys.Append(kyForeign, KeyTypeEnum.adKeyForeign, ADOX.DataTypeEnum.adInteger); // here comes the Exception
}
catch
{
retValue = false;
}
finally
{
if(retValue)
{
if (con != null)
con.Close();
}
}
return retValue;
}
我不找了一個很好的文檔帶代碼示例的adox api,這就是爲什麼我不知道如何解決這個問題? thnx提前
什麼是異常消息? –
在第一種方法,如果我取消註釋這兩個指令的例外是:invaild列id – Orientos