253 lines
11 KiB
C#
253 lines
11 KiB
C#
using CYQ.Data.Json;
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using CYQ.Data.SQL;
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using CYQ.Data.Table;
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using System;
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using System.Collections.Generic;
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using System.Data.Common;
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using System.Data.SqlTypes;
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using System.IO;
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using System.Reflection;
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using System.Runtime.Serialization.Formatters.Binary;
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using System.Text;
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using System.Web;
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namespace CYQ.Data.Tool
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{
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/// <summary>
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/// 类型转换（支持json转实体）
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/// </summary>
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public static partial class ConvertTool
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{
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/// <summary>
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/// DbDataReader To List
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/// </summary>
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internal static List<T> ChangeReaderToList<T>(DbDataReader reader)
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{
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Type t = typeof(T);
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List<T> list = new List<T>();
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if (t.Name == "MDataRow")
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{
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MDataTable dt = reader;
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foreach (object row in dt.Rows)
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{
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list.Add((T)row);
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}
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}
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else if (reader != null)
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{
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#region Reader
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if (reader.HasRows)
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{
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Dictionary<string, Type> kv = new Dictionary<string, Type>(StringComparer.OrdinalIgnoreCase);
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for (int i = 0; i < reader.FieldCount; i++)
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{
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string key = reader.GetName(i);
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if (!kv.ContainsKey(key))//ado.net 底层bug，特殊情况会读出多余重复字段结构，见：https://q.cnblogs.com/q/143699/
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{
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kv.Add(key, reader.GetFieldType(i));
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}
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}
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List<PropertyInfo> pInfoList = ReflectTool.GetPropertyList(t);
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List<FieldInfo> fInfoList = ReflectTool.GetFieldList(t);
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//SQLite 报错：该字符串未被识别为有效的 DateTime，不能用sr[类型读]，要用sdr.GetString读
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// List<string> errIndex = new List<string>();//SQLite提供的dll不靠谱，sdr[x]类型转不过时，会直接抛异常
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Dictionary<string, int> errIndex = new Dictionary<string, int>();
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while (reader.Read())
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{
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T obj = Activator.CreateInstance<T>();
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if (pInfoList.Count > 0)
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{
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foreach (PropertyInfo p in pInfoList)//遍历实体
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{
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if (p.CanWrite && kv.ContainsKey(p.Name))
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{
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object objValue = null;
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try
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{
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if (errIndex.ContainsKey(p.Name))
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{
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int index = errIndex[p.Name];
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if (!reader.IsDBNull(index))
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{
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objValue = reader.GetString(index);
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}
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}
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else
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{
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objValue = reader[p.Name];
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}
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}
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catch
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{
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int index = reader.GetOrdinal(p.Name);
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if (!errIndex.ContainsKey(p.Name))
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{
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errIndex.Add(p.Name, index);
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}
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objValue = reader.GetString(index);
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}
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if (objValue != null && objValue != DBNull.Value)
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{
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if (p.PropertyType != kv[p.Name] || errIndex.ContainsKey(p.Name))
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{
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objValue = ChangeType(objValue, p.PropertyType);//尽量避免类型转换
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}
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p.SetValue(obj, objValue, null);
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}
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}
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}
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}
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if (fInfoList.Count > 0)
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{
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foreach (FieldInfo f in fInfoList)//遍历实体
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{
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if (kv.ContainsKey(f.Name))
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{
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object objValue = null;
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try
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{
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if (errIndex.ContainsKey(f.Name))
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{
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objValue = reader.GetString(errIndex[f.Name]);
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}
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else
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{
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objValue = reader[f.Name];
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}
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}
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catch
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{
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int index = reader.GetOrdinal(f.Name);
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errIndex.Add(f.Name, index);
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objValue = reader.GetString(index);
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}
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if (objValue != null && objValue != DBNull.Value)
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{
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if (f.FieldType != kv[f.Name] || errIndex.ContainsKey(f.Name))
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{
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objValue = ChangeType(objValue, f.FieldType);//尽量避免类型转换
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}
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f.SetValue(obj, objValue);
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}
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}
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}
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}
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list.Add(obj);
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}
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kv.Clear();
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kv = null;
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errIndex.Clear();
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errIndex = null;
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}
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reader.Close();
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reader.Dispose();
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reader = null;
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#endregion
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}
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return list;
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//return List<default(T)>;
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}
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/// <summary>
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/// DbDataReader To Json
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/// </summary>
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internal static string ChangeReaderToJson(DbDataReader reader, JsonHelper js, bool needCheckHiddenField)
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{
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if (js == null)
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{
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js = new JsonHelper(false, false);
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}
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if (reader != null)
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{
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bool[] isBool = new bool[reader.FieldCount];
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bool[] isDateTime = new bool[reader.FieldCount];
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bool[] isNoQuotes = new bool[reader.FieldCount];
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bool[] isHiddenField = new bool[reader.FieldCount];
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string hiddenFields = "," + AppConfig.DB.HiddenFields.ToLower() + ",";
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for (int i = 0; i < reader.FieldCount; i++)
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{
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if (needCheckHiddenField)
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{
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isHiddenField[i] = hiddenFields.IndexOf("," + reader.GetName(i) + ",", StringComparison.OrdinalIgnoreCase) > -1;
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}
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switch (DataType.GetGroup(DataType.GetSqlType(reader.GetFieldType(i))))
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{
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case DataGroupType.Bool:
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isBool[i] = true;
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isNoQuotes[i] = true;
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break;
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case DataGroupType.Number:
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isNoQuotes[i] = true;
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break;
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case DataGroupType.Date:
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isDateTime[i] = true;
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break;
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}
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}
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#region Reader
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//SQLite 报错：该字符串未被识别为有效的 DateTime，不能用sr[类型读]，要用sdr.GetString读
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// List<string> errIndex = new List<string>();//SQLite提供的dll不靠谱，sdr[x]类型转不过时，会直接抛异常
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bool[] errIndex = new bool[reader.FieldCount];
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if (reader.HasRows)
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{
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while (reader.Read())
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{
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js.RowCount++;
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for (int i = 0; i < reader.FieldCount; i++)
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{
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if (isHiddenField[i]) { continue; }
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object objValue = null;
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try
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{
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if (errIndex[i])
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{
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objValue = reader.GetString(i);
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}
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else
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{
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objValue = reader.GetValue(i);
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}
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}
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catch
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{
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errIndex[i] = true;
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objValue = reader.GetString(i);
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}
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if (isDateTime[i])
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{
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DateTime dt;
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if (DateTime.TryParse(Convert.ToString(objValue), out dt))
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{
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objValue = dt.ToString(js.DateTimeFormatter);
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}
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}
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else if (isBool[i])
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{
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objValue = objValue.ToString().ToLower();
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}
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js.Add(reader.GetName(i), Convert.ToString(objValue), isNoQuotes[i]);
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}
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js.AddBr();
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}
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}
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reader.Close();
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reader.Dispose();
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reader = null;
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#endregion
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}
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return js.ToString();
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}
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}
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}
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