C#中DataSet 可视化设计使用方法

对数据库对象的操作可以编码实现，当然.NET提供了更加方便的可视化机制可以帮助我们省却很多麻烦。

首先，在项目中增加新项，选择Dataset数据集，如图所示：

 

比如新建一个CustomersXSD.xsd的数据集，下面将NorthWind数据库中的Customers表拖到当前设计面板,如下如所示：

 

 

如图所示，自动生成名为CustomersTableAdapter的Adapter对象，手动设置增加图上三个方法，

其中GetByPrimaryKey方法如图所示配置：

 

 

 

下面代码演示如何使用CustomerXSD, CustomersTableAdapter来实现对数据表Customers增加一条记录：

首先假设代码中已经生成了表Customer对象类CustomersModel，代码如下：注意加红的部分

 

using Model;//数据库实体类Model

using CustomersXSDTableAdapters;//引入Adapter命名空间

 

public class CustomersDAL

    {

 

        private CustomersTableAdapter _CustomersTableAdapter = null;

        protected CustomersTableAdapter Adapter

        {

            get

            {

                if (_CustomersTableAdapter == null)

                    _CustomersTableAdapter = new CustomersTableAdapter();

 

                return _CustomersTableAdapter;

            }

        }

 

 

       //Get方法，得到表中所有的数据

        public DataTable Get()

        {

            return Adapter.GetData();

        }

 

// 根据主键得到数据表

        public DataTable GetByPrimaryKey(String CustomerID)

        {

            return Adapter.GetByPrimaryKey(CustomerID);

        }

        //增加一条记录

        public bool Add(CustomersModel model)

        {

            CustomersXSD.CustomersDataTable TargetTable = new CustomersXSD.CustomersDataTable();

            CustomersXSD.CustomersRow TargetRow = TargetTable.NewCustomersRow();

 

            TargetRow.CustomerID = model.CustomerID;

            TargetRow.CompanyName = model.CompanyName;

            TargetRow.ContactName = model.ContactName;

            TargetRow.ContactTitle = model.ContactTitle;

            TargetRow.Address = model.Address;

            TargetRow.City = model.City;

            TargetRow.Region = model.Region;

            TargetRow.PostalCode = model.PostalCode;

            TargetRow.Country = model.Country;

            TargetRow.Phone = model.Phone;

            TargetRow.Fax = model.Fax;

 

            TargetTable.AddCustomersRow(TargetRow);

            int rowaffected = Adapter.Update(TargetTable);

            return rowaffected == 1;

        }

        //更新一条记录

        public bool Update(CustomersModel model)

        {

            CustomersXSD.CustomersDataTable TargetTable = Adapter.GetByPrimaryKey(model.CustomerID);

            if (TargetTable.Count == 0)

                return false;

            CustomersXSD.CustomersRow TargetRow = TargetTable[0];

 

            TargetRow.CustomerID = model.CustomerID;

            TargetRow.CompanyName = model.CompanyName;

            TargetRow.ContactName = model.ContactName;

            TargetRow.ContactTitle = model.ContactTitle;

            TargetRow.Address = model.Address;

            TargetRow.City = model.City;

            TargetRow.Region = model.Region;

            TargetRow.PostalCode = model.PostalCode;

            TargetRow.Country = model.Country;

            TargetRow.Phone = model.Phone;

            TargetRow.Fax = model.Fax;

 

            int rowsaffected = Adapter.Update(TargetRow);

            return rowsaffected == 1;

        }

        //删除一条记录

        public bool Delete(String CustomerID)

        {

            int rowsaffected = Adapter.DeleteByCustomerID(CustomerID);

           

            return rowsaffected == 1;

        }

    }