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>
/// Data access abstract base class
///
/// </summary>
public class DBBase
{
// Database connection string (web.config To configure the ) , which can be changed dynamically connectionString Support for multiple databases .
public static string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString1"].ToString();
public DBBase()
{
}
#region Check to see if the username exists
/// <summary>
/// Check to see if the username exists and return it true , there is no return 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(); // Returns the first of the results 1 line 1 column
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 Perform simple SQL statements Returns the number of records affected
/// <summary>
/// perform SQL Statement that returns the number of records affected
/// </summary>
/// <param name="SQLString">SQL statements </param>
/// <returns> Number of records affected </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 Execute the query and return SqlDataReader
/// <summary>
/// Execute the query and return SqlDataReader ( Note: after calling this method, 1 Set to SqlDataReader for Close )
/// </summary>
/// <param name="strSQL"> The query </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 perform SQL Query statement, return DataTable The data table
/// <summary>
/// perform SQL The query
/// </summary>
/// <param name="sqlStr"></param>
/// <returns> return DataTable The data table </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 Stored procedure operation
/// <summary>
/// Running stored procedures , return datatable;
/// </summary>
/// <param name="storedProcName"> Stored procedure name </param>
/// <param name="parameters"> parameter </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>
/// Executing stored procedures
/// </summary>
/// <param name="storedProcName"> Stored procedure name </param>
/// <param name="parameters"> parameter </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)
{
// Check output parameters for unassigned values , Distribute it to 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>
/// build OracleCommand object ( Used to return 1 It's a result set, not a result set 1 An integer value )
/// </summary>
/// <param name="connection"> Database connection </param>
/// <param name="storedProcName"> Stored procedure name </param>
/// <param name="parameters"> Stored procedure parameter </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)
{
// Check output parameters for unassigned values , Distribute it to 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 Transaction processing
/// <summary>
/// To perform multiple SQL statements (list In the form of ) , to implement database transactions.
/// </summary>
/// <param name="SQLStringList"> multiple SQL statements </param>
/// call Transaction The object's Commit Method to complete the transaction, or call Rollback Method to cancel the transaction.
public static int ExecuteSqlTran(List<String> SQLStringList)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
connection.Open();
// Create for the transaction 1 A command
OracleCommand cmd = new OracleCommand();
cmd.Connection = connection;
OracleTransaction tx = connection.BeginTransaction();// Start the 1 A transaction
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();// with Commit Method to complete the transaction
return count;//
}
catch
{
tx.Rollback();// Error, transaction rollback!
return 0;
}
finally
{
cmd.Dispose();
connection.Close();// Close the connection
}
}
}
#endregion
#region Transaction processing
/// <summary>
/// To perform multiple SQL statements ( String array form ) , to implement database transactions.
/// </summary>
/// <param name="SQLStringList"> multiple SQL statements </param>
/// call Transaction The object's Commit Method to complete the transaction, or call Rollback Method to cancel the transaction.
public static int ExecuteTransaction(string[] SQLStringList,int p)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
connection.Open();
// Create for the transaction 1 A command
OracleCommand cmd = new OracleCommand();
cmd.Connection = connection;
OracleTransaction tx = connection.BeginTransaction();// Start the 1 A transaction
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();// with Commit Method to complete the transaction
return count;//
}
catch
{
tx.Rollback();// Error, transaction rollback!
return 0;
}
finally
{
cmd.Dispose();
connection.Close();// Close the connection
}
}
}
#endregion
/// <summary>
/// Execute the stored procedure to get the required number (each table primary key)
/// </summary>
/// <param name="FlowName"> Stored procedure parameter </param>
/// <param name="StepLen"> Stored procedure parameter (default is 1 ) </param>
/// <returns> Number (each table primary key) </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();
}
}
}