根據實體類生成SQL語句（增刪改）
阿新 • • 發佈：2022-04-18
根據實體類生成SQL語句（增刪改）
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Skip to content Product Team Enterprise Explore Marketplace Pricing Search Sign in Sign up MaChuhao / MCHDAL Public Code Issues Pull requests Actions Projects Wiki Security Insights MCHDAL/CreateSQLStr.cs / @MaChuhao MaChuhao 第一次版本提交，該模組是在.NET環境下自動生成SQL語句，並封裝了增刪查改的方法。 Latest commit 33c3783 onView Code6 Mar 2017 History 1 contributor 259 lines (224 sloc) 9.07 KB using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data; using System.Reflection; using System.Data.SqlClient; namespace MCHDAL { public class CreateSQLStr { /// <summary>/// 通用實體類儲存新資料到資料庫的方法 /// 呼叫此方法可獲得SQL Insert語句 /// </summary> /// <typeparam name="T">模板T</typeparam> /// <param name="model">實體物件</param> /// <param name="tablename">表名</param> /// <returns></returns> publicstatic string SaveSQLStr<T>(T model, string tablename) { //獲得此模型的型別 Type type = typeof(T); string fieldsName = "INSERT INTO " + tablename+ "("; string fieldsValue = "VALUES("; PropertyInfo[] propertys = model.GetType().GetProperties(); //遍歷該物件的所有屬性 foreach (PropertyInfo pi in propertys) { string name = pi.Name; object value = pi.GetValue(model, null); if(value != null) { if(pi.PropertyType.Name.Equals("Int32")) { if(Int32.Parse(value.ToString()) != 0) { fieldsName = fieldsName + pi.Name + ','; fieldsValue = fieldsValue + Int32.Parse(value.ToString()) + ','; } } else if (pi.PropertyType.Name.Equals("DateTime")) { if (value.Equals("0001/1/1 0:00:000") || value.Equals("0001/1/1 0:00:00") || (DateTime)value == DateTime.MinValue) { continue; } else { fieldsName = fieldsName + pi.Name + ','; fieldsValue = fieldsValue + "'" + value.ToString() + '\'' + ','; } } else if (pi.PropertyType.Name.Equals("String")|| pi.PropertyType.Name.Equals("Nullable`1")) { fieldsName = fieldsName + pi.Name + ','; fieldsValue = fieldsValue + "'" + value.ToString() + '\'' + ','; } } } fieldsName = fieldsName.Substring(0, fieldsName.Length - 1) + ')' + ' '; //確保該語句返回值為主鍵ID fieldsValue = fieldsValue.Substring(0, fieldsValue.Length - 1) + ')' + " SELECT @@IDENTITY"; return fieldsName + fieldsValue; } /// <summary> /// 通用實體類更新資料庫表資料的方法 /// 呼叫此方法可獲得SQL Update語句 /// </summary> /// <typeparam name="T">模板T</typeparam> /// <param name="model">實體物件</param> /// <param name="tablename">表名</param> /// <returns></returns> public static string UpdateSQLStr<T>(T model, string tablename) { bool flag = false; //獲得此模型的型別 Type type = typeof(T); string fields = "Update " + tablename + " set "; string where = " where "; PropertyInfo[] propertys = model.GetType().GetProperties(); //遍歷該物件的所有屬性 foreach (PropertyInfo pi in propertys) { string name = pi.Name; object value = pi.GetValue(model, null); if (value != null) { if (pi.PropertyType.Name.Equals("Int32")) { if (Int32.Parse(value.ToString()) != 0) { if (name.Equals("ID")) { where = where + pi.Name + "=" + Int32.Parse(value.ToString()); flag = true; } else { fields = fields + pi.Name + '=' + Int32.Parse(value.ToString()) + ','; } } } else if (pi.PropertyType.Name.Equals("DateTime")) { if (value.Equals("0001/1/1 0:00:000") || value.Equals("0001/1/1 0:00:00") || (DateTime)value == DateTime.MinValue) { continue; } else { fields = fields + pi.Name + '=' + "'" + value.ToString() + '\'' + ','; } } else if (pi.PropertyType.Name.Equals("String")) { fields = fields + pi.Name + '=' + "'" + value.ToString() + '\'' + ','; } } } fields = fields.Substring(0, fields.Length - 1) + ' '; if (flag) { return fields + where; } else { return "false"; } } /// <summary> /// 通用實體類刪除資料庫表資料的方法 /// 呼叫此方法可獲得SQL Delete語句 /// </summary> /// <typeparam name="T">模板T</typeparam> /// <param name="model">實體物件</param> /// <param name="tablename">表名</param> /// <returns></returns> public static string DeleteSQLStr<T>(T model, string tablename) { bool flag = false; //獲得此模型的型別 Type type = typeof(T); string fields = "Delete from " + tablename; string where = " where "; PropertyInfo[] propertys = model.GetType().GetProperties(); //遍歷該物件的所有屬性 foreach (PropertyInfo pi in propertys) { string name = pi.Name; object value = pi.GetValue(model, null); if (name.Equals("ID") && Int32.Parse(value.ToString()) != 0) { where = where + pi.Name + "=" + Int32.Parse(value.ToString()); flag = true; } } if (flag) { return fields + where; } else { return "false"; } } /// <summary> /// 通用實體類查詢資料庫表資料的方法 /// 呼叫此方法可獲得SQL Select語句 /// </summary> /// <typeparam name="T">模板T</typeparam> /// <param name="model">實體物件</param> /// <param name="tablename">表名</param> /// <returns></returns> public static string SelectSQLStr<T>(T model, string tableName) { string where = " where "; bool flag = false; PropertyInfo[] propertys = model.GetType().GetProperties(); foreach(PropertyInfo pi in propertys) { string name = pi.Name; object value = pi.GetValue(model, null); if (value != null) { if (pi.PropertyType.Name.Equals("Int32")) { if (Int32.Parse(value.ToString()) != 0) { where = where + pi.Name + "=" + Int32.Parse(value.ToString()) + " and "; flag = true; } }else if (pi.PropertyType.Name.Equals("DateTime")) { //datetime轉換時報錯，因此以0001/1/1 0:00:000標識時間為空 if (value.Equals("0001/1/1 0:00:000")||value.Equals("0001/1/1 0:00:00")||(DateTime)value == DateTime.MinValue) { flag = true; } else { where = where + pi.Name + '=' + "'" + value.ToString() + '\'' + " and "; flag = true; } } else if (pi.PropertyType.Name.Equals("String")) { where = where + pi.Name + '=' + "'" + value.ToString() + '\'' + " and "; flag = true; } } } where = where.Substring(0, where.Length - 4); if (flag) { return "SELECT * FROM " + tableName + where; } else { return "SELECT * FROM " + tableName; } } } } © 2022 GitHub, Inc. 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