ACCESS資料庫C#操作類(SQLHELPER修改版)
阿新 • • 發佈:2019-01-26
- using System;
- using System.Text;
- using System.Collections;
- using System.Collections.Specialized;
- using System.Data;
- using System.Data.OleDb;
- using System.Configuration;
- namespace NMJU.Web.DBUtility
- { /// <summary>
- /// 資料訪問抽象基礎類(ACCESS)
- /// Copyright (C) 2006-2007 NMJU.NET
- /// All rights reserved
- /// </summary>
- public abstract class DbHelperACE
- {
- //資料庫連線字串(web.config來配置)
- //public static string connectionString = ConfigurationManager.AppSettings["ConnectionString"];
- // public static string connectionString = System.Web.HttpContext.Current.Server.MapPath(ConfigurationManager.AppSettings["AccessConnectionString"]);
- public static string connectionString = ConfigurationManager.AppSettings["AccessConnectionString"];
- public DbHelperACE()
- {
- }
- #region 公用方法
- public static int GetMaxID(string FieldName, string TableName)
- {
- string strsql = "select max(" + FieldName + ")+1 from " + TableName;
- object obj = DbHelperACE.GetSingle(strsql);
- if (obj == null)
- {
- return 1;
- }
- else
- {
- return int.Parse(obj.ToString());
- }
- }
- public static bool Exists(string strSql)
- {
- object obj = DbHelperACE.GetSingle(strSql);
- int cmdresult;
- if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
- {
- cmdresult = 0;
- }
- else
- {
- cmdresult = int.Parse(obj.ToString());
- }
- if (cmdresult == 0)
- {
- return false;
- }
- else
- {
- return true;
- }
- }
- public static bool Exists(string strSql, params OleDbParameter[] cmdParms)
- {
- object obj = DbHelperACE.GetSingle(strSql, cmdParms);
- int cmdresult;
- if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
- {
- cmdresult = 0;
- }
- else
- {
- cmdresult = int.Parse(obj.ToString());
- }
- if (cmdresult == 0)
- {
- return false;
- }
- else
- {
- return true;
- }
- }
- #endregion
- #region 執行簡單SQL語句
- /// <summary>
- /// 執行SQL語句,返回影響的記錄數
- /// </summary>
- /// <param name="SQLString">SQL語句</param>
- /// <returns>影響的記錄數</returns>
- public static int ExecuteSql(string SQLString)
- {
- using (OleDbConnection connection = new OleDbConnection(connectionString))
- {
- using (OleDbCommand cmd = new OleDbCommand(SQLString, connection))
- {
- try
- {
- connection.Open();
- int rows = cmd.ExecuteNonQuery();
- return rows;
- }
- catch (System.Data.OleDb.OleDbException E)
- {
- connection.Close();
- throw new Exception(E.Message);
- }
- }
- }
- }
- /// <summary>
- /// 執行SQL語句,設定命令的執行等待時間
- /// </summary>
- /// <param name="SQLString"></param>
- /// <param name="Times"></param>
- /// <returns></returns>
- public static int ExecuteSqlByTime(string SQLString, int Times)
- {
- using (OleDbConnection connection = new OleDbConnection(connectionString))
- {
- using (OleDbCommand cmd = new OleDbCommand(SQLString, connection))
- {
- try
- {
- connection.Open();
- cmd.CommandTimeout = Times;
- int rows = cmd.ExecuteNonQuery();
- return rows;
- }
- catch (System.Data.OleDb.OleDbException E)
- {
- connection.Close();
- throw new Exception(E.Message);
- }
- }
- }
- }
- /// <summary>
- /// 執行多條SQL語句,實現資料庫事務。
- /// </summary>
- /// <param name="SQLStringList">多條SQL語句</param>
- public static void ExecuteSqlTran(ArrayList SQLStringList)
- {
- using (OleDbConnection conn = new OleDbConnection(connectionString))
- {
- conn.Open();
- OleDbCommand cmd = new OleDbCommand();
- cmd.Connection = conn;
- OleDbTransaction tx = conn.BeginTransaction();
- cmd.Transaction = tx;
- try
- {
- for (int n = 0; n < SQLStringList.Count; n++)
- {
- string strsql = SQLStringList[n].ToString();
- if (strsql.Trim().Length > 1)
- {
- cmd.CommandText = strsql;
- cmd.ExecuteNonQuery();
- }
- }
- tx.Commit();
- }
- catch (System.Data.OleDb.OleDbException E)
- {
- tx.Rollback();
- throw new Exception(E.Message);
- }
- }
- }
- /// <summary>
- /// 向資料庫裡插入影象格式的欄位(和上面情況類似的另一種例項)
- /// </summary>
- /// <param name="strSQL">SQL語句</param>
- /// <param name="fs">影象位元組,資料庫的欄位型別為image的情況</param>
- /// <returns>影響的記錄數</returns>
- public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
- {
- using (OleDbConnection connection = new OleDbConnection(connectionString))
- {
- OleDbCommand cmd = new OleDbCommand(strSQL, connection);
- System.Data.OleDb.OleDbParameter myParameter = new System.Data.OleDb.OleDbParameter("@fs", SqlDbType.Image);
- myParameter.Value = fs;
- cmd.Parameters.Add(myParameter);
- try
- {
- connection.Open();
- int rows = cmd.ExecuteNonQuery();
- return rows;
- }
- catch (System.Data.OleDb.OleDbException E)
- {
- throw new Exception(E.Message);
- }
- finally
- {
- cmd.Dispose();
- connection.Close();
- }
- }
- }
- /// <summary>
- /// 執行一條計算查詢結果語句,返回查詢結果(object)。
- /// </summary>
- /// <param name="SQLString">計算查詢結果語句</param>
- /// <returns>查詢結果(object)</returns>
- public static object GetSingle(string SQLString)
- {
- using (OleDbConnection connection = new OleDbConnection(connectionString))
- {
- using (OleDbCommand cmd = new OleDbCommand(SQLString, connection))
- {
- try
- {
- connection.Open();
- object obj = cmd.ExecuteScalar();
- if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
- {
- return null;
- }
- else
- {
- return obj;
- }
- }
- catch (System.Data.OleDb.OleDbException e)
- {
- connection.Close();
- throw new Exception(e.Message);
- }
- }
- }
- }
- /// <summary>
- /// 執行查詢語句,返回SqlDataReader(使用該方法切記要手工關閉SqlDataReader和連線)
- /// </summary>
- /// <param name="strSQL">查詢語句</param>
- /// <returns>SqlDataReader</returns>
- public static OleDbDataReader ExecuteReader(string strSQL)
- {
- OleDbConnection connection = new OleDbConnection(connectionString);
- OleDbCommand cmd = new OleDbCommand(strSQL, connection);
- try
- {
- connection.Open();
- OleDbDataReader myReader = cmd.ExecuteReader();
- return myReader;
- }
- catch (System.Data.OleDb.OleDbException e)
- {
- throw new Exception(e.Message);
- }
- //finally //不能在此關閉,否則,返回的物件將無法使用
- //{
- // cmd.Dispose();
- // connection.Close();
- //}
- }
- /// <summary>
- /// 執行查詢語句,返回DataSet
- /// </summary>
- /// <param name="SQLString">查詢語句</param>
- /// <returns>DataSet</returns>
- public static DataSet Query(string SQLString)
- {
- using (OleDbConnection connection = new OleDbConnection(connectionString))
- {
- DataSet ds = new DataSet();
- try
- {
- connection.Open();
- OleDbDataAdapter command = new OleDbDataAdapter(SQLString, connection);
- command.Fill(ds, "ds");
- }
- catch (System.Data.OleDb.OleDbException ex)
- {
- throw new Exception(ex.Message);
- }
- return ds;
- }
- }
- /// <summary>
- /// 執行查詢語句,返回DataSet,設定命令的執行等待時間
- /// </summary>
- /// <param name="SQLString"></param>
- /// <param name="Times"></param>
- /// <returns></returns>
- public static DataSet Query(string SQLString, int Times)
- {
- using (OleDbConnection connection = new OleDbConnection(connectionString))
- {
- DataSet ds = new DataSet();
- try
- {
- connection.Open();
- OleDbDataAdapter command = new OleDbDataAdapter(SQLString, connection);
- command.SelectCommand.CommandTimeout = Times;
- command.Fill(ds, "ds");
- }
- catch (System.Data.OleDb.OleDbException ex)
- {
- throw new Exception(ex.Message);
- }
- return ds;
- }
- }
- #endregion
- #region 執行帶引數的SQL語句
- /// <summary>
- /// 執行SQL語句,返回影響的記錄數
- /// </summary>
- /// <param name="SQLString">SQL語句</param>
- /// <returns>影響的記錄數</returns>
- public static int ExecuteSql(string SQLString, params OleDbParameter[] cmdParms)
- {
- using (OleDbConnection connection = new OleDbConnection(connectionString))
- {
- using (OleDbCommand cmd = new OleDbCommand())
- {
- try
- {
- PrepareCommand(cmd, connection, null, SQLString, cmdParms);
- int rows = cmd.ExecuteNonQuery();
- cmd.Parameters.Clear();
- return rows;
- }
- catch (System.Data.OleDb.OleDbException E)
- {
- throw new Exception(E.Message);
- }
- }
- }
- }
- /// <summary>
- /// 執行多條SQL語句,實現資料庫事務。
- /// </summary>
- /// <param name="SQLStringList">SQL語句的雜湊表(key為sql語句,value是該語句的OleDbParameter[])</param>
- public static void ExecuteSqlTran(Hashtable SQLStringList)
- {
- using (OleDbConnection conn = new OleDbConnection(connectionString))
- {
- conn.Open();
- using (OleDbTransaction trans = conn.BeginTransaction())
- {
- OleDbCommand cmd = new OleDbCommand();
- try
- {
- //迴圈
- foreach (DictionaryEntry myDE in SQLStringList)
- {
- string cmdText = myDE.Key.ToString();
- OleDbParameter[] cmdParms = (OleDbParameter[])myDE.Value;
- PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
- int val = cmd.ExecuteNonQuery();
- cmd.Parameters.Clear();
- trans.Commit();
- }
- }
- catch
- {
- trans.Rollback();
- throw;
- }
- }
- }
- }
- /// <summary>
- /// 執行一條計算查詢結果語句,返回查詢結果(object)。
- /// </summary>
- /// <param name="SQLString">計算查詢結果語句</param>
- /// <returns>查詢結果(object)</returns>
- public static object GetSingle(string SQLString, params OleDbParameter[] cmdParms)
- {
- using (OleDbConnection connection = new OleDbConnection(connectionString))
- {
- using (OleDbCommand cmd = new OleDbCommand())
- {
- try
- {
- PrepareCommand(cmd, connection, null, SQLString, cmdParms);
- object obj = cmd.ExecuteScalar();
- cmd.Parameters.Clear();
- if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
- {
- return null;
- }
- else
- {
- return obj;
- }
- }
- catch (System.Data.OleDb.OleDbException e)
- {
- throw new Exception(e.Message);
- }
- }
- }
- }
- /// <summary>
- /// 執行查詢語句,返回SqlDataReader (使用該方法切記要手工關閉SqlDataReader和連線)
- /// </summary>
- /// <param name="strSQL">查詢語句</param>
- /// <returns>SqlDataReader</returns>
- public static OleDbDataReader ExecuteReader(string SQLString, params OleDbParameter[] cmdParms)
- {
- OleDbConnection connection = new OleDbConnection(connectionString);
- OleDbCommand cmd = new OleDbCommand();
- try
- {
- PrepareCommand(cmd, connection, null, SQLString, cmdParms);
- OleDbDataReader myReader = cmd.ExecuteReader();
- cmd.Parameters.Clear();
- return myReader;
- }
- catch (System.Data.OleDb.OleDbException e)
- {
- throw new Exception(e.Message);
- }
- //finally //不能在此關閉,否則,返回的物件將無法使用
- //{
- // cmd.Dispose();
- // connection.Close();
- //}
- }
- /// <summary>
- /// 執行查詢語句,返回DataSet
- /// </summary>
- /// <param name="SQLString">查詢語句</param>
- /// <returns>DataSet</returns>
- public static DataSet Query(string SQLString, params OleDbParameter[] cmdParms)
- {
- using (OleDbConnection connection = new OleDbConnection(connectionString))
- {
- OleDbCommand cmd = new OleDbCommand();
- PrepareCommand(cmd, connection, null, SQLString, cmdParms);
- using (OleDbDataAdapter da = new OleDbDataAdapter(cmd))
- {
- DataSet ds = new DataSet();
- try
- {
- da.Fill(ds, "ds");
- cmd.Parameters.Clear();
- }
- catch (System.Data.OleDb.OleDbException ex)
- {
- throw new Exception(ex.Message);
- }
- return ds;
- }
- }
- }
- private static void PrepareCommand(OleDbCommand cmd, OleDbConnection conn, OleDbTransaction trans, string cmdText, OleDbParameter[] cmdParms)
- {
- if (conn.State != ConnectionState.Open)
- conn.Open();
- cmd.Connection = conn;
- cmd.CommandText = cmdText;
- if (trans != null)
- cmd.Transaction = trans;
- cmd.CommandType = CommandType.Text;//cmdType;
- if (cmdParms != null)
- {
- foreach (OleDbParameter parameter in cmdParms)
- {
- if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
- (parameter.Value == null))
- {
- parameter.Value = DBNull.Value;
- }
- cmd.Parameters.Add(parameter);
- }
- }
- }
- #endregion
- #region 獲取根據指定欄位排序並分頁查詢。
- /**/
- /// <summary>
- /// 分頁查詢資料記錄總數獲取
- /// </summary>
- /// <param name="_tbName">----要顯示的表或多個表的連線</param>
- /// <param name="_ID">----主表的主鍵</param>
- /// <param name="_strCondition">----查詢條件,不需where</param>
- /// <param name="_Dist">----是否新增查詢欄位的 DISTINCT 預設0不新增/1新增</param>
- /// <returns></returns>
- public static string getPageListCounts(string _ID, string _tbName, string _strCondition, int _Dist)
- {
- //---存放取得查詢結果總數的查詢語句
- //---對含有DISTINCT的查詢進行SQL構造
- //---對含有DISTINCT的總數查詢進行SQL構造
- string strTmp = "", SqlSelect = "", SqlCounts = "";
- if (_Dist == 0)
- {
- SqlSelect = "Select ";
- SqlCounts = "COUNT(*)";
- }
- else
- {
- SqlSelect = "Select DISTINCT ";
- SqlCounts = "COUNT(DISTINCT " + _ID + ")";
- }
- if (_strCondition == string.Empty)
- {
- strTmp = SqlSelect + " "+ SqlCounts + " FROM " + _tbName;
- }
- else
- {
- strTmp = SqlSelect + " "+ SqlCounts + " FROM " + " Where (1=1) " + _strCondition;
- }
- return strTmp;
- }
- /// <summary>
- /// 智慧返回SQL語句
- /// </summary>
- /// <param name="primaryKey">主鍵(不能為空)</param>
- /// <param name="queryFields">提取欄位(不能為空)</param>
- /// <param name="tableName">表(理論上允許多表)</param>
- /// <param name="condition">條件(可以空)</param>
- /// <param name="OrderBy">排序,格式:欄位名+""+ASC(可以空)</param>
- /// <param name="pageSize">分頁數(不能為空)</param>
- /// <param name="pageIndex">當前頁,起始為:1(不能為空)</param>
- /// <returns></returns>
- public static string getPageListSql(string primaryKey, string queryFields, string tableName, string condition, string orderBy, int pageSize, int pageIndex)
- {
- string strTmp = ""; //---strTmp用於返回的SQL語句
- string SqlSelect = "", SqlPrimaryKeySelect = "", strOrderBy = "", strWhere = " where 1=1 ", strTop = "";
- //0:分頁數量
- //1:提取欄位
- //2:表
- //3:條件
- //4:主鍵不存在的記錄
- //5:排序
- SqlSelect = " select top {0} {1} from {2} {3} {4} {5}";
- //0:主鍵
- //1:TOP數量,為分頁數*(排序號-1)
- //2:表
- //3:條件
- //4:排序
- SqlPrimaryKeySelect = " and {0} not in (select {1} {0} from {2} {3} {4}) ";
- if (orderBy != "")
- strOrderBy = " order by " + orderBy;
- if (condition != "")
- strWhere += " and " + condition;
- int pageindexsize = (pageIndex - 1) * pageSize;
- if (pageindexsize > 0)
- {
- strTop = " top " + pageindexsize.ToString();
- SqlPrimaryKeySelect = String.Format(SqlPrimaryKeySelect, primaryKey, strTop, tableName, strWhere, strOrderBy);
- strTmp = String.Format(SqlSelect, pageSize.ToString(), queryFields, tableName, strWhere, SqlPrimaryKeySelect, strOrderBy);
- }
- else
- {
- strTmp = String.Format(SqlSelect, pageSize.ToString(), queryFields, tableName, strWhere, "", strOrderBy);
- }
- return strTmp;
- }
- /// <summary>
- /// 獲取根據指定欄位排序並分頁查詢。DataSet
- /// </summary>
- /// <param name="pageSize">每頁要顯示的記錄的數目</param>
- /// <param name="pageIndex">要顯示的頁的索引</param>
- /// <param name="tableName">要查詢的資料表</param>
- /// <param name="queryFields">要查詢的欄位,如果是全部欄位請填寫:*</param>
- /// <param name="primaryKey">主鍵欄位,類似排序用到</param>
- /// <param name="orderBy">是否為升序排列:0為升序,1為降序</param>
- /// <param name="condition">查詢的篩選條件</param>
- /// <returns>返回排序並分頁查詢的DataSet</returns>
- public static DataSet GetPagingList(string primaryKey, string queryFields, string tableName, string condition, string orderBy, int pageSize, int pageIndex)
- {
- string sql = getPageListSql(primaryKey, queryFields, tableName, condition, orderBy, pageSize, pageIndex);
- return Query(sql);
- }
- public static string GetPagingListSQL(string primaryKey, string queryFields, string tableName, string condition, string orderBy, int pageSize, int pageIndex)
- {
- string sql = getPageListSql(primaryKey, queryFields, tableName, condition, orderBy, pageSize, pageIndex);
- return sql;
- }
- public static int GetRecordCount(string _ID, string _tbName, string _strCondition, int _Dist)
- {
- string sql = getPageListCounts( _ID, _tbName, _strCondition, _Dist);
- object obj = DbHelperACE.GetSingle(sql);
- if (obj == null)
- {
- return 1;
- }
- else
- {
- return int.Parse(obj.ToString());
- }
- }
- #endregion
- }
- }