C# 如何使用adox向access表添加外键
我正在尝试创建一个包含两个表的数据库。我想在其中一个中添加一个外键。 但是下面的代码不起作用,我调试了它,发现唯一的问题是添加外键C# 如何使用adox向access表添加外键,c#,ms-access,adox,C#,Ms Access,Adox,我正在尝试创建一个包含两个表的数据库。我想在其中一个中添加一个外键。 但是下面的代码不起作用,我调试了它,发现唯一的问题是添加外键 private static bool creatDatabase() { bool result = false; Catalog cat = new Catalog(); Table tableCustomer = new Table(); Table tableAddresses = n
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;
}
如果我尝试以下方法(在上面的方法中创建数据库后打开数据库),它也不起作用:
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;
}
我没有找到一个关于ADOXAPI的好的文档和代码示例,这就是为什么我不知道如何解决这个问题?
thnx提前问题是您没有填写
相关表
和相关列
参数。将第一段代码中的注释行替换为以下内容:
tableAddresses.Columns.Append("Customer_ID", ADOX.DataTypeEnum.adInteger);
tableAddresses.Keys.Append("ForeignKey", ADOX.KeyTypeEnum.adKeyForeign, "Customer_ID", "Customer", "Customer_ID");
异常消息是什么?在第一种方法中,如果我取消对这两条指令的注释,则异常为:invaild column id