using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
using System.Data;
using System.Data.OleDb;
using System.Configuration;
namespace Athrun
{
class OleDbDAL
{
//protected static string connectionString = ConfigurationSettings.AppSettings["DefaultDataSource"];//.net1.1
protected static string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["connString"].ToString();
public OleDbDAL()
{
//構造function
}
#region 公用方法
public static int GetMaxID(string FieldName, string TableName)
{
string strsql = "select max(" + FieldName + ")+1 from " + TableName;
object obj = GetSingle(strsql);
if (obj == null)
{
return 1;
}
else
{
return int.Parse(obj.ToString());
}
}
public static bool Exists(string strSql, params OleDbParameter[] cmdParms)
{
object obj = 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>
/// 執行多條SQL語句，實現數據庫事務。
/// </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>
/// 執行帶一個存儲過程參數的的SQL語句。
/// </summary>
/// <param name="SQLString">SQL語句</param>
/// <param name="content">參數內容,比如一個字段是格式復雜的文章，有特殊符號，可以通過這個方式添加</param>
/// <returns>影響的記錄數</returns>
public static int ExecuteSql(string SQLString, string content)
{
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
OleDbCommand cmd = new OleDbCommand(SQLString, connection);
System.Data.OleDb.OleDbParameter myParameter = new System.Data.OleDb.OleDbParameter("@content", OleDbType.VarChar);
myParameter.Value = content;
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>
/// 向數據庫裡插入圖像格式的字段(和上面情況類似的另一種實例)
/// </summary>
/// <param name="strSQL">SQL語句</param>
/// <param name="fs">圖像字節,數據庫的字段類型為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", OleDbType.Binary);
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OleDbDataReader
/// </summary>
/// <param name="strSQL">查詢語句</param>
/// <returns>OleDbDataReader</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);
}
}
/// <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;
}
}
#endregion
#region 執行帶參數的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，實現數據庫事務。
/// </summary>
/// <param name="SQLStringList">SQL語句的哈希表（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
{
//循環
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OleDbDataReader
/// </summary>
/// <param name="strSQL">查詢語句</param>
/// <returns>OleDbDataReader</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);
}
}
/// <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 parm in cmdParms)
cmd.Parameters.Add(parm);
}
}
#endregion
#region 存儲過程操作
/// <summary>
/// 執行存儲過程
/// </summary>
/// <param name="storedProcName">存儲過程名</param>
/// <param name="parameters">存儲過程參數</param>
/// <returns>OleDbDataReader</returns>
public static OleDbDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)
{
OleDbConnection connection = new OleDbConnection(connectionString);
OleDbDataReader returnReader;
connection.Open();
OleDbCommand command = BuildQueryCommand(connection, storedProcName, parameters);
command.CommandType = CommandType.StoredProcedure;
returnReader = command.ExecuteReader();
return returnReader;
}
/// <summary>
/// 執行存儲過程
/// </summary>
/// <param name="storedProcName">存儲過程名</param>
/// <param name="parameters">存儲過程參數</param>
/// <param name="tableName">DataSet結果中的表名</param>
/// <returns>DataSet</returns>
public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
{
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
DataSet dataSet = new DataSet();
connection.Open();
OleDbDataAdapter sqlDA = new OleDbDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
sqlDA.Fill(dataSet, tableName);
connection.Close();
return dataSet;
}
}
/// <summary>
/// 構建 OleDbCommand 對像(用來返回一個結果集，而不是一個整數值)
/// </summary>
/// <param name="connection">數據庫連接</param>
/// <param name="storedProcName">存儲過程名</param>
/// <param name="parameters">存儲過程參數</param>
/// <returns>OleDbCommand</returns>
private static OleDbCommand BuildQueryCommand(OleDbConnection connection, string storedProcName, IDataParameter[] parameters)
{
OleDbCommand command = new OleDbCommand(storedProcName, connection);
command.CommandType = CommandType.StoredProcedure;
foreach (OleDbParameter parameter in parameters)
{
command.Parameters.Add(parameter);
}
return command;
}
/// <summary>
/// 執行存儲過程，返回影響的行數
/// </summary>
/// <param name="storedProcName">存儲過程名</param>
/// <param name="parameters">存儲過程參數</param>
/// <param name="rowsAffected">影響的行數</param>
/// <returns></returns>
public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected)
{
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
int result;
connection.Open();
OleDbCommand command = BuildIntCommand(connection, storedProcName, parameters);
rowsAffected = command.ExecuteNonQuery();
result = (int)command.Parameters["ReturnValue"].Value;
//Connection.Close();
return result;
}
}
/// <summary>
/// 創建 OleDbCommand 對像實例(用來返回一個整數值)
/// </summary>
/// <param name="storedProcName">存儲過程名</param>
/// <param name="parameters">存儲過程參數</param>
/// <returns>OleDbCommand 對像實例</returns>
private static OleDbCommand BuildIntCommand(OleDbConnection connection, string storedProcName, IDataParameter[] parameters)
{
OleDbCommand command = BuildQueryCommand(connection, storedProcName, parameters);
command.Parameters.Add(new OleDbParameter("ReturnValue",
OleDbType.Integer, 4, ParameterDirection.ReturnValue,
false, 0, 0, string.Empty, DataRowVersion.Default, null));
return command;
}
#endregion
}
}
