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>
/// 数据访问抽象基础类
///
/// </summary>
public class DBBase
{
//数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.
public static string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString1"].ToString();
public DBBase()
{
}
#region 检查用户名是否存在
/// <summary>
/// 检查用户名是否存在，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(); //返回结果的第一行一列
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 执行简单SQL语句 返回影响的记录数
/// <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)
{
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 执行查询语句，返回SqlDataReader
/// <summary>
/// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
/// </summary>
/// <param name="strSQL">查询语句</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 执行SQL查询语句，返回DataTable数据表
/// <summary>
/// 执行SQL查询语句
/// </summary>
/// <param name="sqlStr"></param>
/// <returns>返回DataTable数据表</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 存储过程操作
/// <summary>
/// 运行存储过程,返回datatable;
/// </summary>
/// <param name="storedProcName">存储过程名称</param>
/// <param name="parameters">参数</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>
/// 执行存储过程
/// </summary>
/// <param name="storedProcName">存储过程名称</param>
/// <param name="parameters">参数</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)
{
// 检查未分配值的输出参数,将其分配以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>
/// 构建 OracleCommand 对象(用来返回一个结果集，而不是一个整数值)
/// </summary>
/// <param name="connection">数据库连接</param>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</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)
{
// 检查未分配值的输出参数,将其分配以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 事务处理
/// <summary>
/// 执行多条SQL语句(list的形式)，实现数据库事务。
/// </summary>
/// <param name="SQLStringList">多条SQL语句</param>
/// 调用 Transaction 对象的 Commit 方法来完成事务，或调用 Rollback 方法来取消事务。
public static int ExecuteSqlTran(List<String> SQLStringList)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
connection.Open();
// 为事务创建一个命令
OracleCommand cmd = new OracleCommand();
cmd.Connection = connection;
OracleTransaction tx = connection.BeginTransaction();// 启动一个事务
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方法来完成事务
return count;//
}
catch
{
tx.Rollback();//出现错误，事务回滚！
return 0;
}
finally
{
cmd.Dispose();
connection.Close();//关闭连接
}
}
}
#endregion
#region 事务处理
/// <summary>
/// 执行多条SQL语句(字符串数组形式)，实现数据库事务。
/// </summary>
/// <param name="SQLStringList">多条SQL语句</param>
/// 调用 Transaction 对象的 Commit 方法来完成事务，或调用 Rollback 方法来取消事务。
public static int ExecuteTransaction(string[] SQLStringList,int p)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
connection.Open();
// 为事务创建一个命令
OracleCommand cmd = new OracleCommand();
cmd.Connection = connection;
OracleTransaction tx = connection.BeginTransaction();// 启动一个事务
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方法来完成事务
return count;//
}
catch
{
tx.Rollback();//出现错误，事务回滚！
return 0;
}
finally
{
cmd.Dispose();
connection.Close();//关闭连接
}
}
}
#endregion
/// <summary>
/// 执行存储过程获取所需编号（各表主键）
/// </summary>
/// <param name="FlowName">存储过程参数</param>
/// <param name="StepLen">存储过程参数（默认为1）</param>
/// <returns>编号（各表主键）</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();
}
}
}