我要评论C# ACCESS的SQL添加数据操作封装类AccessSqlIn
找了很久，都没有找到C# 的Access数据添加操作封装的类，又不想用添加别人的lib库，只好自己封装了一个。
该类采用简化设计，没有异常处理，只是生成SQL时会判断下条件，如果条件不符就会返回空字符，要自己写判断条件就行了。
using System; using System.Collections; using System.Collections.Generic; using System.Linq; using System.Text; namespace kqgz.Model { class AccessSqlIn { private string _tbname = ""; public string TbName { get => _tbname; set => _tbname = value; } private Hashtable slist = new Hashtable(); public void AddString(string key,string value) { if(slist.ContainsKey(key)) { slist.Remove(key); } slist.Add(key, value); } private Hashtable dlist = new Hashtable(); public void AddDate(string key,string value) { if (dlist.ContainsKey(key)) { dlist.Remove(key); } dlist.Add(key, value); } private Hashtable nlist = new Hashtable(); public void AddNull(string key) { if (nlist.ContainsKey(key)) { nlist.Remove(key); } nlist.Add(key, null); } private Hashtable ilist = new Hashtable(); public void AddInt(string key, int value) { if (ilist.ContainsKey(key)) { ilist.Remove(key); } ilist.Add(key, value); } public string GetInsertSql() { string sql = ""; if(_tbname == "") { return ""; } int slen = slist.Count; int dlen = dlist.Count; int nlen = nlist.Count; if(slen == 0 && dlen ==0 && nlen == 0) { return ""; } sql = "insert into {0}({1}) values({2})"; sql = sql.Replace("{0}", _tbname); string liestr = ""; string vstr = ""; //string foreach (DictionaryEntry de in slist) { if(liestr == "") { liestr = de.Key.ToString(); } else { liestr += "," + de.Key.ToString(); } if (vstr == "") { vstr = "'" + de.Value.ToString() + "'"; } else { vstr += ",'" + de.Value.ToString() + "'"; } } //date foreach (DictionaryEntry de in dlist) { if (liestr == "") { liestr = de.Key.ToString(); } else { liestr += "," + de.Key.ToString(); } if (vstr == "") { vstr = "#" + de.Value.ToString() + "#"; } else { vstr += ",#" + de.Value.ToString() + "#"; } } //null foreach (DictionaryEntry de in nlist) { if (liestr == "") { liestr = de.Key.ToString(); } else { liestr += "," + de.Key.ToString(); } if (vstr == "") { vstr = "null"; } else { vstr += ",null"; } } //int foreach (DictionaryEntry de in ilist) { if (liestr == "") { liestr = de.Key.ToString(); } else { liestr += "," + de.Key.ToString(); } if (vstr == "") { vstr = Convert.ToString(de.Value); } else { vstr += "," + Convert.ToString(de.Value); } } sql = sql.Replace("{1}",liestr); sql = sql.Replace("{2}",vstr); return sql; } public void ResetData() { slist.Clear(); dlist.Clear(); nlist.Clear(); ilist.Clear(); } public void ResetTable() { TbName = ""; } } }
一边判断条件一边添加字段就行了，多方便，从此过上幸福的日子，不需要对着一长串insert语句发傻，不担心字段和数值错位。
我只封装了自己用到的数据类型，float、double那些没有封装，需要其他类型的话可以自己照样子添加就行了。
使用方法如下：
AccessSqlIn sqlin = new AccessSqlIn(); sqlin.TbName = "userinfo"; //字符串 sqlin.AddString("uno",ghstr); //日期 string rzstr = dateTimePicker1.Value.ToString("yyyy-M-d"); sqlin.AddDate("uinday", rzstr); //整型 string jtstr = tbjintie.Text.Trim(); int jt = Convert.ToInt32(jtstr); sqlin.AddInt("ujt", jt); //null sqlin.AddNull("ulfday"); string sql = sqlin.GetInsertSql(); if(sql == "") { MessageBox.Show("SQL出现异常", "提示"); return; } 添加成功后，调用ResetData()，又可以继续添加下一条记录，真过瘾。
本文地址：https://blog.csdn.net/lixiaoxing2/article/details/107912250
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