using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.OracleClient;
using System.Configuration;
using System.Data.Common;
using System.Collections.Generic;
/// summary>
/// 數據訪問抽象基礎類
///
/// /summary>
public class DBBase
{
//數據庫連接字符串(web.config來配置)，可以動態更改connectionString支持多數據庫.
public static string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString1"].ToString();
public DBBase()
{
}
#region 檢查用戶名是否存在
/// summary>
/// 檢查用戶名是否存在，存在返回true，不存在返回false
/// /summary>
/// param name="strSql">/param>
/// returns>/returns>
public static bool Exists(string strSql)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
connection.Open();
OracleCommand myCmd = new OracleCommand(strSql, connection);
try
{
object obj = myCmd.ExecuteScalar(); //返回結果的第一行一列
myCmd.Parameters.Clear();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return false;
}
else
{
return true;
}
}
catch (Exception ex)
{
throw ex;
}
}
}
#endregion
#region 執行簡單SQL語句 返回影響的記錄數
/// 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)
{
OracleConnection connection = null;
OracleCommand cmd = null;
try
{
connection = new OracleConnection(connectionString);
cmd = new OracleCommand(SQLString, connection);
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
finally
{
if (cmd != null)
{
cmd.Dispose();
}
if (connection != null)
{
connection.Close();
connection.Dispose();
}
}
}
#endregion
#region 執行查詢語句，返回SqlDataReader
/// summary>
/// 執行查詢語句，返回SqlDataReader ( 注意：調用該方法后，一定要對SqlDataReader進行Close )
/// /summary>
/// param name="strSQL">查詢語句/param>
/// returns>SqlDataReader/returns>
public static OracleDataReader ExecuteReader(string strSQL)
{
OracleConnection connection = new OracleConnection(connectionString);
OracleCommand cmd = new OracleCommand(strSQL, connection);
try
{
connection.Open();
OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return myReader;
}
catch (System.Data.OracleClient.OracleException e)
{
throw e;
}
finally
{
connection.Close();
}
}
#endregion
#region 執行SQL查詢語句，返回DataTable數據表
/// summary>
/// 執行SQL查詢語句
/// /summary>
/// param name="sqlStr">/param>
/// returns>返回DataTable數據表/returns>
public static DataTable GetDataTable(string sqlStr)
{
OracleConnection mycon = new OracleConnection(connectionString);
OracleCommand mycmd = new OracleCommand(sqlStr, mycon);
DataTable dt = new DataTable();
OracleDataAdapter da = null;
try
{
mycon.Open();
da = new OracleDataAdapter(sqlStr, mycon);
da.Fill(dt);
}
catch (Exception ex)
{
throw new Exception(ex.ToString());
}
finally
{
mycon.Close();
}
return dt;
}
#endregion
#region 存儲過程操作
/// summary>
/// 運行存儲過程,返回datatable;
/// /summary>
/// param name="storedProcName">存儲過程名稱/param>
/// param name="parameters">參數/param>
/// returns>/returns>
public static DataTable RunProcedureDatatable(string storedProcName, IDataParameter[] parameters)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
DataSet ds = new DataSet();
connection.Open();
OracleDataAdapter sqlDA = new OracleDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
sqlDA.Fill(ds);
connection.Close();
return ds.Tables[0];
}
}
/// summary>
/// 執行存儲過程
/// /summary>
/// param name="storedProcName">存儲過程名稱/param>
/// param name="parameters">參數/param>
/// returns>/returns>
public static int RunProcedure(string storedProcName, IDataParameter[] parameters)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
try
{
connection.Open();
OracleCommand command = new OracleCommand(storedProcName, connection);
command.CommandType = CommandType.StoredProcedure;
foreach (OracleParameter parameter in parameters)
{
if (parameter != null)
{
// 檢查未分配值的輸出參數,將其分配以DBNull.Value.
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input)
(parameter.Value == null))
{
parameter.Value = DBNull.Value;
}
command.Parameters.Add(parameter);
}
}
int rows = command.ExecuteNonQuery();
return rows;
}
finally
{
connection.Close();
}
}
}
/// summary>
/// 構建 OracleCommand 對象(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>OracleCommand/returns>
private static OracleCommand BuildQueryCommand(OracleConnection connection, string storedProcName, IDataParameter[] parameters)
{
OracleCommand command = new OracleCommand(storedProcName, connection);
command.CommandType = CommandType.StoredProcedure;
foreach (OracleParameter parameter in parameters)
{
if (parameter != null)
{
// 檢查未分配值的輸出參數,將其分配以DBNull.Value.
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input)
(parameter.Value == null))
{
parameter.Value = DBNull.Value;
}
command.Parameters.Add(parameter);
}
}
return command;
}
#endregion
#region 事務處理
/// summary>
/// 執行多條SQL語句(list的形式)，實現數據庫事務。
/// /summary>
/// param name="SQLStringList">多條SQL語句/param>
/// 調用 Transaction 對象的 Commit 方法來完成事務，或調用 Rollback 方法來取消事務。
public static int ExecuteSqlTran(ListString> SQLStringList)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
connection.Open();
// 為事務創建一個命令
OracleCommand cmd = new OracleCommand();
cmd.Connection = connection;
OracleTransaction tx = connection.BeginTransaction();// 啟動一個事務
cmd.Transaction = tx;
try
{
int count = 0;
for (int n = 0; n SQLStringList.Count; n++)
{
string strsql = SQLStringList[n];
if (strsql.Trim().Length > 1)
{
cmd.CommandText = strsql;
count += cmd.ExecuteNonQuery();
}
}
tx.Commit();//用Commit方法來完成事務
return count;//
}
catch
{
tx.Rollback();//出現錯誤，事務回滾！
return 0;
}
finally
{
cmd.Dispose();
connection.Close();//關閉連接
}
}
}
#endregion
#region 事務處理
/// summary>
/// 執行多條SQL語句(字符串數組形式)，實現數據庫事務。
/// /summary>
/// param name="SQLStringList">多條SQL語句/param>
/// 調用 Transaction 對象的 Commit 方法來完成事務，或調用 Rollback 方法來取消事務。
public static int ExecuteTransaction(string[] SQLStringList,int p)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
connection.Open();
// 為事務創建一個命令
OracleCommand cmd = new OracleCommand();
cmd.Connection = connection;
OracleTransaction tx = connection.BeginTransaction();// 啟動一個事務
cmd.Transaction = tx;
try
{
int count = 0;
for (int n = 0; n p; n++)
{
string strsql = SQLStringList[n];
if (strsql.Trim().Length > 1)
{
cmd.CommandText = strsql;
count += cmd.ExecuteNonQuery();
}
}
tx.Commit();//用Commit方法來完成事務
return count;//
}
catch
{
tx.Rollback();//出現錯誤，事務回滾！
return 0;
}
finally
{
cmd.Dispose();
connection.Close();//關閉連接
}
}
}
#endregion
/// summary>
/// 執行存儲過程獲取所需編號（各表主鍵）
/// /summary>
/// param name="FlowName">存儲過程參數/param>
/// param name="StepLen">存儲過程參數（默認為1）/param>
/// returns>編號（各表主鍵）/returns>
public static string Get_FlowNum(string FlowName, int StepLen = 1)
{
OracleConnection mycon = new OracleConnection(connectionString);
try
{
mycon.Open();
OracleCommand MyCommand = new OracleCommand("ALARM_GET_FLOWNUMBER", mycon);
MyCommand.CommandType = CommandType.StoredProcedure;
MyCommand.Parameters.Add(new OracleParameter("I_FlowName", OracleType.VarChar, 50));
MyCommand.Parameters["I_FlowName"].Value = FlowName;
MyCommand.Parameters.Add(new OracleParameter("I_SeriesNum", OracleType.Number));
MyCommand.Parameters["I_SeriesNum"].Value = StepLen;
MyCommand.Parameters.Add(new OracleParameter("O_FlowValue", OracleType.Number));
MyCommand.Parameters["O_FlowValue"].Direction = ParameterDirection.Output;
MyCommand.ExecuteNonQuery();
return MyCommand.Parameters["O_FlowValue"].Value.ToString();
}
catch
{
return "";
}
finally
{
mycon.Close();
}
}
}
