/// <summary>
/// 从DataTable获取一个实体列表
/// </summary>
/// <param name="table">DataTable实例</param>
/// <remarks>
/// <list type="bullet">
/// <item><description>建议不要直接从DataTable返回实体,而是通过CPQuery或者StoreProcedure返回实体</description></item>
/// </list>
/// </remarks>
/// <example>
/// <para>下面的代码演示了从DataTable获取一个实体列表的用法</para>
/// <code>
/// <![CDATA[
/// //存储过程中包含两个SELECT语句,返回两个结果集
/// DataSet ds = StoreProcedure.Create("usp_GetTestDataType").FillDataSet();
///
/// foreach( DataTable table in ds2.Tables ) {
///
/// //将DataTable转换为实体集合
/// List<TestDataType> list = table.ToList<TestDataType>();
///
/// }
/// ]]>
/// </code>
/// </example>
/// <typeparam name="T">实体类型</typeparam>
/// <exception cref="ArgumentNullException">table参数为null</exception>
/// <returns>实体列表</returns>
public static List <T> ToList <T>(this DataTable table) where T : class, new()
{
if (table == null)
{
throw new ArgumentNullException("table");
}
Type type = typeof(T);
TypeDescription description = TypeDescriptionCache.GetTypeDiscription(type);
if (description.ExecuteFunc != null)
{
try {
return(description.ExecuteFunc(10, new object[] { table }) as List <T>);
}
catch (System.Exception ex) {
//这里不希望调用者看到代码生成器产生的代码结构,于是在这里抛出捕获到的异常
throw ex;
}
}
else if (type.IsSubclassOf(typeof(BaseEntity)))
{
throw new InvalidProgramException(
string.Format("类型 {0} 找不到ToList的操作方法，请确认已将实体类型定义在*.Entity.dll结尾的程序集中，且不是嵌套类，并已提供无参的构造函数。", type.FullName));
}
else
{
return(DbHelper.ToList <T>(table, description));
}
}
internal static T ToSingle <T>(SqlCommand cmd) where T : class, new()
{
Type type = typeof(T);
TypeDescription description = TypeDescriptionCache.GetTypeDiscription(type);
using (ConnectionScope scope = new ConnectionScope()) {
return(scope.Current.ExecuteCommand <T>(cmd, p => {
using (SqlDataReader reader = p.ExecuteReader()) {
if (description.ExecuteFunc != null)
{
return description.ExecuteFunc(2, new object[] { reader }) as T;
}
else if (type.IsSubclassOf(typeof(BaseEntity)))
{
throw BaseEntity.GetNonStandardExecption(type);
}
else
{
return ToSingle <T>(reader, description);
}
}
}));
}
}
/// <summary>
/// 实体校验
/// </summary>
/// <param name="fields">忽略字段</param>
/// <returns></returns>
public Boolean Valid(List <String> fields)
{
if (fields == null)
{
fields = new List <String>();
}
TypeDescription description = TypeDescriptionCache.GetTypeDiscription(GetType());
return((Boolean)description.ExecuteFunc(14, new object[] { this, fields }));
}
/// <summary>
/// 此API不宜在项目代码中调用，仅供内部使用。
/// </summary>
public void TrackChange()
{
TypeDescription description = TypeDescriptionCache.GetTypeDiscription(GetType());
if (description.ExecuteFunc == null)
{
throw GetNonStandardExecption(this.GetType());
}
bakObject = description.ExecuteFunc(13, new object[] { this }) as BaseEntity;
}
internal CPQuery GetCPQuery(int flag, params object[] parameters)
{
TypeDescription description = TypeDescriptionCache.GetTypeDiscription(GetType());
if (description.ExecuteFunc == null)
{
throw GetNonStandardExecption(this.GetType());
}
try {
return(description.ExecuteFunc(flag, parameters) as CPQuery);
}
catch (System.Exception ex) {
//这里不希望调用者看到代码生成器产生的代码结构,于是在这里抛出捕获到的异常
throw ex;
}
}
/// <summary>
/// 将Map平台AppForm格式xml字符串转换为实体对象集合
/// </summary>
/// <remarks>
/// <list type="bullet">
/// <item><description>xml结构为3层,第1层被忽略,第2层为数据库表名,第3层为字段名</description></item>
/// <item><description>xml结构第2层节点必须包含keyname,keyvalue属性,keyvalue属性可以为空</description></item>
/// <item><description>如果类,属性存在Alias别名标记,则按照别名赋值,否则按照类名,属性名赋值</description></item>
/// </list>
/// </remarks>
/// <example>
/// <para>下面的代码演示了从ConvertXmlToList()方法的用法</para>
/// <code>
/// <![CDATA[
/// using System;
/// using System.Collections.Generic;
/// using System.Linq;
/// using System.Text;
///
/// //引入命名空间
/// using Mysoft.Map.Extensions;
/// using Mysoft.Map.Extensions.Xml;
/// using Mysoft.Map.Extensions.DAL;
/// namespace Demo
/// {
/// public class DemoBusiness
/// {
/// public void Demo(){
/// string xml = @"<UserData>
/// <cb_Contract keyname="ContractGUID" keyvalue="">
/// <ContractName>测试合同一</ContractName>
/// <ContractCode>HT-001</ContractCode>
/// ...其他值
/// </cb_Contract>
/// <cb_Contract keyname="ContractGUID" keyvalue="">
/// <ContractName>测试合同二</ContractName>
/// <ContractCode>HT-002</ContractCode>
/// ...其他值
/// </cb_Contract>
/// </UserData>";
///
/// List<CbContract> contracts = XmlDataEntity.ConvertXmlToList<CbContract>(xml);
///
/// foreach(CbContract contract in contracts){
/// //主键为空,表示是新增
/// if (contract.ContractGUID == Guid.Empty){
/// contract.ContractGUID = Guid.NewGuid();
/// //插入到数据库
/// contract.Insert();
/// }
/// else{
/// //更新到数据库
/// contract.Update();
/// }
/// }
/// }
/// }
/// }
/// ]]>
/// </code>
/// </example>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="xml">xml字符串</param>
/// <returns>实体对象集合</returns>
public static List <T> ConvertXmlToList <T>(string xml) where T : BaseEntity, new()
{
if (string.IsNullOrEmpty(xml))
{
throw new ArgumentNullException("xml");
}
Type type = typeof(T);
TypeDescription description = TypeDescriptionCache.GetTypeDiscription(type);
if (description.ExecuteFunc == null)
{
throw BaseEntity.GetNonStandardExecption(type);
}
try {
return(description.ExecuteFunc(12, new object[] { xml }) as List <T>);
}
catch (System.Exception ex) {
//这里不希望调用者看到代码生成器产生的代码结构,于是在这里抛出捕获到的异常
throw ex;
}
}
