Silverlight 2 (beta1)数据操作(4)——调用WCF进行数据CRUD操作
2008-10-11 11:42:33 来源:WEB开发网编写WCF Service
第一步:定义服务契约。我们为WCF Service提供的增删查改方法定义服务契约。
[ServiceContract]
public interface IUserService
{
[OperationContract]
string RetrieveUser();
[OperationContract]
bool CreateUser(string userName);
[OperationContract]
bool UpdateUser(int userID, string userName);
[OperationContract]
bool DeleteUser(int userID);
}
第二步:在UserService中实现服务:为增删查改四个方法具体实现。这里使用SQL语句了,同第一篇类似。
public class UserService : IUserService
{
//查询用户
public string RetrieveUser()
{
try
{
SqlConnection _sqlConnection =
new SqlConnection( ConfigurationManager.
ConnectionStrings["sqlConnectionString"].
ConnectionString);
_sqlConnection.Open();
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = new SqlCommand("SELECT * FROM [User]",
_sqlConnection);
DataSet ds = new DataSet();
da.Fill(ds);
StringBuilder sb = new StringBuilder();
sb.Append("<?xml version="1.0" encoding="utf-8" ?>");
sb.Append("<Users>");
foreach (DataRow dr in ds.Tables[0].Rows)
{
sb.Append("<User>");
sb.Append("<UserID>");
sb.Append(dr[0].ToString());
sb.Append("</UserID>");
sb.Append("<UserName>");
sb.Append(dr[1].ToString());
sb.Append("</UserName>");
sb.Append("</User>");
}
sb.Append("</Users>");
_sqlConnection.Close();
return sb.ToString();
}
catch (Exception ex)
{
return string.Empty;
}
}
//创建用户
public bool CreateUser(string userName)
{
try
{
SqlConnection _sqlConnection =
new SqlConnection(ConfigurationManager.
ConnectionStrings["sqlConnectionString"]
.ConnectionString);
_sqlConnection.Open();
SqlCommand command = new SqlCommand();
command.Connection = _sqlConnection;
command.CommandType = CommandType.Text;
command.CommandText = "INSERT INTO [User]
([UserName]) VALUES ('" +
userName.ToString().Replace("'", "''") + "')";
command.ExecuteNonQuery();
_sqlConnection.Close();
return true;
}
catch (Exception ex)
{
return false;
}
}
//更新用户
public bool UpdateUser(int userID, string userName)
{
try
{
SqlConnection _sqlConnection =
new SqlConnection(ConfigurationManager.
ConnectionStrings["sqlConnectionString"]
.ConnectionString);
_sqlConnection.Open();
SqlCommand command = new SqlCommand();
command.Connection = _sqlConnection;
command.CommandType = CommandType.Text;
command.CommandText = "UPDATE [User] " +
"SET [UserName] = '" +
userName.ToString().Replace("'", "''") + "'" +
"WHERE [UserID] = " + userID.ToString();
command.ExecuteNonQuery();
_sqlConnection.Close();
return true;
}
catch (Exception ex)
{
return false;
}
}
//删除用户
public bool DeleteUser(int userID)
{
try
{
SqlConnection _sqlConnection =
new SqlConnection(ConfigurationManager.
ConnectionStrings["sqlConnectionString"]
.ConnectionString);
_sqlConnection.Open();
SqlCommand command = new SqlCommand();
command.Connection = _sqlConnection;
command.CommandType = CommandType.Text;
command.CommandText = "DELETE [User] WHERE [UserID] = "
+ userID.ToString();
command.ExecuteNonQuery();
_sqlConnection.Close();
return true;
}
catch (Exception ex)
{
return false;
}
}
}
第三步:修改Web.config中的服务配置。
Tags:Silverlight 数据
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