ACCESS数据库C#操作类代码,CSharp代码库,德仔网

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【CSharp】 ACCESS数据库C#操作类
作者:烁铠 / 发布于2014/10/9/ 247
这个是针对ACCESS数据库操作的类，同样也是从SQLHELPER提取而来，分页程序的调用可以参考MSSQL那个类的调用，差不多的，只是提取所有记录的数量的时候有多一个参数

	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>
	 /// 数据访问抽象基础类(ACCESS)
	 /// Copyright (C) 2006-2007 NMJU.NET
	 /// All rights reserved
	 /// </summary>
	 public abstract class DbHelperACE
	 {
	 //数据库连接字符串(web.config来配置)
	 //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 执行简单SQL语句
	
	 /// <summary>
	 /// 执行SQL语句，返回影响的记录数
	 /// </summary>
	 /// <param name="SQLString">SQL语句</param>
	 /// <returns>影响的记录数</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>
	 /// 执行SQL语句，设置命令的执行等待时间
	 /// </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>
	 /// 执行多条SQL语句，实现数据库事务。
	 /// </summary>
	 /// <param name="SQLStringList">多条SQL语句</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>
	 /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
	 /// </summary>
	 /// <param name="strSQL">SQL语句</param>
	 /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
	 /// <returns>影响的记录数</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>
	 /// 执行一条计算查询结果语句，返回查询结果（object）。
	 /// </summary>
	 /// <param name="SQLString">计算查询结果语句</param>
	 /// <returns>查询结果（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>
	 /// 执行查询语句，返回SqlDataReader(使用该方法切记要手工关闭SqlDataReader和连接)
	 /// </summary>
	 /// <param name="strSQL">查询语句</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 //不能在此关闭，否则，返回的对象将无法使用
	 //{
	 // cmd.Dispose();
	 // connection.Close();
	 //}
	
	
	 }
	 /// <summary>
	 /// 执行查询语句，返回DataSet
	 /// </summary>
	 /// <param name="SQLString">查询语句</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>
	 /// 执行查询语句，返回DataSet,设置命令的执行等待时间
	 /// </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 执行带参数的SQL语句
	
	 /// <summary>
	 /// 执行SQL语句，返回影响的记录数
	 /// </summary>
	 /// <param name="SQLString">SQL语句</param>
	 /// <returns>影响的记录数</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>
	 /// 执行多条SQL语句，实现数据库事务。
	 /// </summary>
	 /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的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
	 {
	 //循环
	 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>
	 /// 执行一条计算查询结果语句，返回查询结果（object）。
	 /// </summary>
	 /// <param name="SQLString">计算查询结果语句</param>
	 /// <returns>查询结果（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>
	 /// 执行查询语句，返回SqlDataReader (使用该方法切记要手工关闭SqlDataReader和连接)
	 /// </summary>
	 /// <param name="strSQL">查询语句</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 //不能在此关闭，否则，返回的对象将无法使用
	 //{
	 // cmd.Dispose();
	 // connection.Close();
	 //}
	
	 }
	
	 /// <summary>
	 /// 执行查询语句，返回DataSet
	 /// </summary>
	 /// <param name="SQLString">查询语句</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 获取根据指定字段排序并分页查询。
	
	
	 /**/
	 /// <summary>
	 /// 分页查询数据记录总数获取
	 /// </summary>
	 /// <param name="_tbName">----要显示的表或多个表的连接</param>
	 /// <param name="_ID">----主表的主键</param>
	 /// <param name="_strCondition">----查询条件,不需where</param>
	 /// <param name="_Dist">----是否添加查询字段的 DISTINCT 默认0不添加/1添加</param>
	 /// <returns></returns>
	 public static string getPageListCounts(string _ID, string _tbName, string _strCondition, int _Dist)
	 {
	 //---存放取得查询结果总数的查询语句
	 //---对含有DISTINCT的查询进行SQL构造
	 //---对含有DISTINCT的总数查询进行SQL构造
	 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>
	 /// 智能返回SQL语句
	 /// </summary>
	 /// <param name="primaryKey">主键（不能为空）</param>
	 /// <param name="queryFields">提取字段（不能为空）</param>
	 /// <param name="tableName">表（理论上允许多表）</param>
	 /// <param name="condition">条件（可以空）</param>
	 /// <param name="OrderBy">排序，格式：字段名+""+ASC（可以空）</param>
	 /// <param name="pageSize">分页数（不能为空）</param>
	 /// <param name="pageIndex">当前页，起始为：1（不能为空）</param>
	 /// <returns></returns>
	
	 public static string getPageListSql(string primaryKey, string queryFields, string tableName, string condition, string orderBy, int pageSize, int pageIndex)
	 {
	 string strTmp = ""; //---strTmp用于返回的SQL语句
	 string SqlSelect = "", SqlPrimaryKeySelect = "", strOrderBy = "", strWhere = " where 1=1 ", strTop = "";
	 //0：分页数量
	 //1:提取字段
	 //2:表
	 //3:条件
	 //4:主键不存在的记录
	 //5:排序
	 SqlSelect = " select top {0} {1} from {2} {3} {4} {5}";
	 //0:主键
	 //1:TOP数量,为分页数*(排序号-1)
	 //2:表
	 //3:条件
	 //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>
	 /// 获取根据指定字段排序并分页查询。DataSet
	 /// </summary>
	 /// <param name="pageSize">每页要显示的记录的数目</param>
	 /// <param name="pageIndex">要显示的页的索引</param>
	 /// <param name="tableName">要查询的数据表</param>
	 /// <param name="queryFields">要查询的字段,如果是全部字段请填写：*</param>
	 /// <param name="primaryKey">主键字段，类似排序用到</param>
	 /// <param name="orderBy">是否为升序排列：0为升序，1为降序</param>
	 /// <param name="condition">查询的筛选条件</param>
	 /// <returns>返回排序并分页查询的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
	
	 }
	}
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