DBHelper助手

摘要

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;
using System.Data.SqlClient;
using System.Data;
using System.Collections;

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;
using System.Data.SqlClient;
using System.Data;
using System.Collections;

namespace LineWork.DAL
{
public class DBHelper
{
//数据库连接字符串(web.config来配置)，多数据库可使用DbHelperSQLP来实现.
//public static string connectionString = ConfigurationManager.AppSettings["ConnectionString"];
private static string connectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

/// <summary>
///无参构造函数
/// </summary>
public DBHelper()
{
connectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
}

#region 公用方法

#region 判断是否存在某表的某个字段
/// <summary>
/// 判断是否存在某表的某个字段
/// </summary>
/// <param name="tableName">表名称</param>
/// <param name="columnName">列名称</param>
/// <returns>是否存在</returns>
public static bool ColumnExists(string tableName, string columnName)
{
string sql = "select count(1) from syscolumns where [id]=object_id('" + tableName + "') and [name]='" + columnName + "'";
object res = GetSingle(sql);
if (res == null)
{
return false;
}
return Convert.ToInt32(res) > 0;
}
#endregion

#region 获取表内最大的ID
/// <summary>
/// 获取表内最大的ID
/// </summary>
/// <param name="FieldName">字段名</param>
/// <param name="TableName">表名</param>
/// <returns></returns>
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());
}
}
#endregion

#region 执行一条计算查询结果语句，返回查询结果（参数为StrSql）
/// <summary>
/// 执行一条计算查询结果语句，返回查询结果（参数为StrSql）
/// </summary>
/// <param name="strSql">sql</param>
/// <returns></returns>
public static bool Exists(string strSql)
{
object obj = 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;
}
}
#endregion

#region 执行一条计算查询结果语句，返回查询结果（参数为TableName）
/// <summary>
/// 执行一条计算查询结果语句，返回查询结果（参数为TableName）
/// </summary>
/// <param name="TableName">TableName</param>
/// <returns></returns>
public static bool TabExists(string TableName)
{
string strsql = "select count(*) from sysobjects where id = object_id(N'[" + TableName + "]') and OBJECTPROPERTY(id, N'IsUserTable') = 1";
//string strsql = "SELECT count(*) FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[" + TableName + "]') AND type in (N'U')";
object obj = 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;
}
}
#endregion

#region 执行一条计算查询结果语句，返回查询结果（参数为strSql,cmdParms）
/// <summary>
/// 执行一条计算查询结果语句，返回查询结果（参数为strSql,cmdParms）
/// </summary>
/// <param name="strSql">strSql</param>
/// <param name="cmdParms">cmdParms</param>
/// <returns></returns>
public static bool Exists(CommandType cmdType, string strSql, params SqlParameter[] cmdParms)
{
object obj = GetSingle(cmdType, 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

#endregion

#region 执行简单SQL语句

#region 执行SQL语句，返回影响的记录数ExecuteSql
/// <summary>
/// 执行SQL语句，返回影响的记录数ExecuteSql
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <returns>影响的记录数</returns>
public static int ExecuteSql(string SQLString)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand(SQLString, connection))
{
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
finally
{
connection.Close();
}
}
}
}
#endregion

#region 执行SQL语句，返回影响的记录数ExecuteSqlByTime
/// <summary>
/// 执行SQL语句，返回影响的记录数ExecuteSqlByTime
/// </summary>
/// <param name="SQLString">sql</param>
/// <param name="Times"></param>
/// <returns></returns>
public static int ExecuteSqlByTime(string SQLString, int Times)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand(SQLString, connection))
{
try
{
connection.Open();
cmd.CommandTimeout = Times;
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
finally
{
connection.Close();
}
}
}
}

#endregion

#region 注释掉的
///// <summary>
///// 执行Sql和Oracle滴混合事务
///// </summary>
///// <param name="list">SQL命令行列表</param>
///// <param name="oracleCmdSqlList">Oracle命令行列表</param>
///// <returns>执行结果 0-由于SQL造成事务失败 -1 由于Oracle造成事务失败 1-整体事务执行成功</returns>
//public static int ExecuteSqlTran(List<CommandInfo> list, List<CommandInfo> oracleCmdSqlList)
//{
// using (SqlConnection conn = new SqlConnection(connectionString))
// {
// conn.Open();
// SqlCommand cmd = new SqlCommand();
// cmd.Connection = conn;
// SqlTransaction tx = conn.BeginTransaction();
// cmd.Transaction = tx;
// try
// {
// foreach (CommandInfo myDE in list)
// {
// string cmdText = myDE.CommandText;
// SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
// PrepareCommand(cmd, conn, tx, cmdText, cmdParms);
// if (myDE.EffentNextType == EffentNextType.SolicitationEvent)
// {
// if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
// {
// tx.Rollback();
// throw new Exception("违背要求" + myDE.CommandText + "必须符合select count(..的格式");
// //return 0;
// }

// object obj = cmd.ExecuteScalar();
// bool isHave = false;
// if (obj == null && obj == DBNull.Value)
// {
// isHave = false;
// }
// isHave = Convert.ToInt32(obj) > 0;
// if (isHave)
// {
// //引发事件
// myDE.OnSolicitationEvent();
// }
// }
// if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
// {
// if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
// {
// tx.Rollback();
// throw new Exception("SQL:违背要求" + myDE.CommandText + "必须符合select count(..的格式");
// //return 0;
// }

// object obj = cmd.ExecuteScalar();
// bool isHave = false;
// if (obj == null && obj == DBNull.Value)
// {
// isHave = false;
// }
// isHave = Convert.ToInt32(obj) > 0;

// if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
// {
// tx.Rollback();
// throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须大于0");
// //return 0;
// }
// if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
// {
// tx.Rollback();
// throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须等于0");
// //return 0;
// }
// continue;
// }
// int val = cmd.ExecuteNonQuery();
// if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)
// {
// tx.Rollback();
// throw new Exception("SQL:违背要求" + myDE.CommandText + "必须有影响行");
// //return 0;
// }
// cmd.Parameters.Clear();
// }
// string oraConnectionString = PubConstant.GetConnectionString("ConnectionStringPPC");
// bool res = OracleHelper.ExecuteSqlTran(oraConnectionString, oracleCmdSqlList);
// if (!res)
// {
// tx.Rollback();
// throw new Exception("Oracle执行失败");
// // return -1;
// }
// tx.Commit();
// return 1;
// }
// catch (System.Data.SqlClient.SqlException e)
// {
// tx.Rollback();
// throw e;
// }
// catch (Exception e)
// {
// tx.Rollback();
// throw e;
// }
// }
//}
#endregion

#region 执行多条SQL语句，实现数据库事务
/// <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 int ExecuteSqlTran(List<String> SQLStringList)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
SqlTransaction tx = conn.BeginTransaction();
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();
return count;
}
catch
{
tx.Rollback();
return -1;
}
}
}
/// <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 int ExecuteSqlTran2(List<StringBuilder> SQLStringList)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
SqlTransaction tx = conn.BeginTransaction();
cmd.Transaction = tx;
try
{
int count = 0;
for (int n = 0; n < SQLStringList.Count; n++)
{
string strsql = SQLStringList[n].ToString();
if (strsql.Trim().Length > 1)
{
cmd.CommandText = strsql;
count += cmd.ExecuteNonQuery();
}
}
tx.Commit();
return count;
}
catch
{
tx.Rollback();
return -1;
}
}
}
#endregion

#region 执行带一个存储过程参数的的SQL语句
/// <summary>
/// 执行带一个存储过程参数的的SQL语句
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
/// <returns>影响的记录数</returns>
public static int ExecuteSql(string SQLString, string content)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand(SQLString, connection);
System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);
myParameter.Value = content;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
#endregion

#region 执行带一个存储过程参数的SQL语句ExecuteSqlGet(string SQLString, string content)
/// <summary>
/// 执行带一个存储过程参数的SQL语句ExecuteSqlGet(string SQLString, string content)
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
/// <returns>影响的记录数</returns>
public static object ExecuteSqlGet(string SQLString, string content)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand(SQLString, connection);
System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);
myParameter.Value = content;
cmd.Parameters.Add(myParameter);
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.SqlClient.SqlException e)
{
throw e;
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
#endregion

#region 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)ExecuteSqlInsertImg(string strSQL, byte[] fs)
/// <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)ExecuteSqlInsertImg(string strSQL, byte[] fs)
/// </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 (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand(strSQL, connection);
System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@fs", SqlDbType.Image);
myParameter.Value = fs;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
#endregion

#region 执行一条计算查询结果语句，返回查询结果（object）GetSingle(string SQLString)
/// <summary>
/// 执行一条计算查询结果语句，返回查询结果（object）GetSingle(string SQLString)
/// </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 (SqlConnection connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand(SQLString, connection))
{
try
{
connection.Open();
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return "";
}
else
{
return obj;
}
}
catch (System.Data.SqlClient.SqlException e)
{
connection.Close();
throw e;
}
}
}
}
#endregion

#region 执行一条计算查询结果语句，返回查询结果（object）GetSingle(string SQLString, int Times)
/// <summary>
/// 执行一条计算查询结果语句，返回查询结果（object）GetSingle(string SQLString, int Times)
/// </summary>
/// <param name="SQLString">计算查询结果语句</param>
/// <param name="Times"></param>
/// <returns>查询结果（object）</returns>
public static object GetSingle(string SQLString, int Times)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand(SQLString, connection))
{
try
{
connection.Open();
cmd.CommandTimeout = Times;
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (System.Data.SqlClient.SqlException e)
{
connection.Close();
throw e;
}
}
}
}
#endregion

#region 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>
/// 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 SqlDataReader ExecuteReader(string strSQL)
{
SqlConnection connection = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand(strSQL, connection);
try
{
connection.Open();
SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return myReader;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}

}
#endregion

#region 执行查询语句，返回DataSet--Query(string SQLString)
/// <summary>
/// 执行查询语句，返回DataSet--Query(string SQLString)
/// </summary>
/// <param name="SQLString">查询语句</param>
/// <returns>DataSet</returns>
public static DataSet Query(string SQLString)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
command.Fill(ds, "ds");
}
catch (System.Data.SqlClient.SqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
#endregion

#region 执行查询语句，返回DataSet--Query(string SQLString, int Times)
/// <summary>
/// 执行查询语句，返回DataSet--Query(string SQLString, int Times)
/// </summary>
/// <param name="SQLString">查询语句</param>
/// /// <param name="Times"></param>
/// <returns>DataSet</returns>
public static DataSet Query(string SQLString, int Times)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
command.SelectCommand.CommandTimeout = Times;
command.Fill(ds, "ds");
}
catch (System.Data.SqlClient.SqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
#endregion

#endregion

#region 执行多条带参数的Sql语句

public static int ExecuteBatchSql(StringBuilder[] sqls, object[] param)
{
int num = 0;
try
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
SqlTransaction transaction = connection.BeginTransaction();
try
{
for (int i = 0; i < sqls.Length; i++)
{
StringBuilder builder = sqls[i];
if (builder != null)
{
SqlParameter[] pars = (SqlParameter[])param[i];
SqlCommand exCmd = new SqlCommand(builder.ToString(), connection);
if (null != pars && pars.Length > 0)
exCmd.Parameters.AddRange(pars);
exCmd.Transaction = transaction;
num += exCmd.ExecuteNonQuery();
}
}
transaction.Commit();
}
catch (Exception)
{
num = -1;
}
finally
{
connection.Close();
}
}
}
catch (Exception)
{
num = -1;
}

return num;
}
#endregion

//public static string GetCount(string Sql)
//{
// try
// {
// SqlConnection connection = new SqlConnection(connectionString);
// SqlCommand exCmd = new SqlCommand(Sql, connection);

// connection.Open();
// SqlDataReader result = exCmd.ExecuteNonQuery();
// string i = "0";
// while (result.Read())
// {
// i = result.ToString();
// }
// result.Close();
// exCmd.Dispose();
// connection.Close();
// return i;
// }
// catch (Exception ex)
// {
// System.Windows.Forms.MessageBox.Show(ex.Message + "rn" + Sql);
// return "0";
// }
//}

#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(CommandType cmdType, string SQLString, params SqlParameter[] cmdParms)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand())
{
try
{
PrepareCommand(cmd, cmdType, connection, null, SQLString, cmdParms);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
}
}
}

/// <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SqlParameter[]）</param>
public static void ExecuteSqlTran(CommandType cmdType, Hashtable SQLStringList)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
conn.Open();
using (SqlTransaction trans = conn.BeginTransaction())
{
SqlCommand cmd = new SqlCommand();
try
{
//循环
foreach (DictionaryEntry myDE in SQLStringList)
{
string cmdText = myDE.Key.ToString();
SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;
PrepareCommand(cmd, cmdType, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
}
trans.Commit();
}
catch
{
trans.Rollback();
throw;
}
}
}
}

///// <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SqlParameter[]）</param>
//public static int ExecuteSqlTran(System.Collections.Generic.List<CommandInfo> cmdList)
//{
// using (SqlConnection conn = new SqlConnection(connectionString))
// {
// conn.Open();
// using (SqlTransaction trans = conn.BeginTransaction())
// {
// SqlCommand cmd = new SqlCommand();
// try
// {
// int count = 0;
// //循环
// foreach (CommandInfo myDE in cmdList)
// {
// string cmdText = myDE.CommandText;
// SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
// PrepareCommand(cmd, conn, trans, cmdText, cmdParms);

// if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
// {
// if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
// {
// trans.Rollback();
// return 0;
// }

// object obj = cmd.ExecuteScalar();
// bool isHave = false;
// if (obj == null && obj == DBNull.Value)
// {
// isHave = false;
// }
// isHave = Convert.ToInt32(obj) > 0;

// if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
// {
// trans.Rollback();
// return 0;
// }
// if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
// {
// trans.Rollback();
// return 0;
// }
// continue;
// }
// int val = cmd.ExecuteNonQuery();
// count += val;
// if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)
// {
// trans.Rollback();
// return 0;
// }
// cmd.Parameters.Clear();
// }
// trans.Commit();
// return count;
// }
// catch
// {
// trans.Rollback();
// throw;
// }
// }
// }
//}
///// <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SqlParameter[]）</param>
//public static void ExecuteSqlTranWithIndentity(System.Collections.Generic.List<CommandInfo> SQLStringList)
//{
// using (SqlConnection conn = new SqlConnection(connectionString))
// {
// conn.Open();
// using (SqlTransaction trans = conn.BeginTransaction())
// {
// SqlCommand cmd = new SqlCommand();
// try
// {
// int indentity = 0;
// //循环
// foreach (CommandInfo myDE in SQLStringList)
// {
// string cmdText = myDE.CommandText;
// SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
// foreach (SqlParameter q in cmdParms)
// {
// if (q.Direction == ParameterDirection.InputOutput)
// {
// q.Value = indentity;
// }
// }
// PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
// int val = cmd.ExecuteNonQuery();
// foreach (SqlParameter q in cmdParms)
// {
// if (q.Direction == ParameterDirection.Output)
// {
// indentity = Convert.ToInt32(q.Value);
// }
// }
// cmd.Parameters.Clear();
// }
// trans.Commit();
// }
// catch
// {
// trans.Rollback();
// throw;
// }
// }
// }
//}

 

/// <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SqlParameter[]）</param>
public static void ExecuteSqlTranWithIndentity(CommandType cmdType, Hashtable SQLStringList)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
conn.Open();
using (SqlTransaction trans = conn.BeginTransaction())
{
SqlCommand cmd = new SqlCommand();
try
{
int indentity = 0;
//循环
foreach (DictionaryEntry myDE in SQLStringList)
{
string cmdText = myDE.Key.ToString();
SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;
foreach (SqlParameter q in cmdParms)
{
if (q.Direction == ParameterDirection.InputOutput)
{
q.Value = indentity;
}
}
PrepareCommand(cmd, cmdType, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
foreach (SqlParameter q in cmdParms)
{
if (q.Direction == ParameterDirection.Output)
{
indentity = Convert.ToInt32(q.Value);
}
}
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(CommandType cmdType, string SQLString, params SqlParameter[] cmdParms)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand())
{
try
{
PrepareCommand(cmd, cmdType, 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.SqlClient.SqlException e)
{
throw e;
}
}
}
}

/// <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 SqlDataReader ExecuteReader(CommandType cmdType, string SQLString, params SqlParameter[] cmdParms)
{
SqlConnection connection = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand();
try
{
PrepareCommand(cmd, cmdType, connection, null, SQLString, cmdParms);
SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return myReader;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
// finally
// {
// 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(CommandType cmdType, string SQLString, params SqlParameter[] cmdParms)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, cmdType, connection, null, SQLString, cmdParms);
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
try
{
da.Fill(ds, "ds");
cmd.Parameters.Clear();
}
catch (System.Data.SqlClient.SqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
}

private static void PrepareCommand(SqlCommand cmd, CommandType cmdType, SqlConnection conn, SqlTransaction trans, string cmdText, SqlParameter[] cmdParms)
{
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Connection = conn;
cmd.CommandText = cmdText;
if (trans != null)
cmd.Transaction = trans;
cmd.CommandType = cmdType;//cmdType;
if (cmdParms != null)
{

foreach (SqlParameter 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 存储过程操作

/// <summary>
/// 执行存储过程，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
/// </summary>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <returns>SqlDataReader</returns>
public static SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)
{
SqlConnection connection = new SqlConnection(connectionString);
SqlDataReader returnReader;
connection.Open();
SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
command.CommandType = CommandType.StoredProcedure;
returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);
return returnReader;

}

/// <summary>
/// 执行存储过程
/// </summary>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <param name="tableName">DataSet结果中的表名</param>
/// <returns>DataSet</returns>
public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataSet dataSet = new DataSet();
connection.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
sqlDA.Fill(dataSet, tableName);
connection.Close();
return dataSet;
}
}

public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName, int Times)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataSet dataSet = new DataSet();
connection.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
sqlDA.SelectCommand.CommandTimeout = Times;
sqlDA.Fill(dataSet, tableName);
connection.Close();
return dataSet;
}
}

/// <summary>
/// 返回DataTable
/// </summary>
/// <param name="cmdType"></param>
/// <param name="cmdText"></param>
/// <param name="tableName"></param>
/// <param name="objParams"></param>
/// <returns></returns>
public static DataTable GetDataTable(CommandType cmdType, string cmdText, params SqlParameter[] objParams)
{
SqlCommand cmd = new SqlCommand();
DataTable dt = new DataTable();

using (SqlConnection conn = new SqlConnection(connectionString))
{
if (conn.State == ConnectionState.Closed)
{ conn.Open(); }

cmd.Connection = conn;
cmd.CommandType = cmdType;
cmd.CommandText = cmdText;

if (objParams != null)
{
// 参数
cmd.Parameters.AddRange(objParams);
}

SqlDataAdapter adapter = new SqlDataAdapter(cmd);

try
{
adapter.Fill(dt);

return dt;
}
catch
{
conn.Close();
return null;
}
}
}

/// <summary>
/// 构建 SqlCommand 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>SqlCommand</returns>
private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
{
SqlCommand command = new SqlCommand(storedProcName, connection);
command.CommandType = CommandType.StoredProcedure;
if (parameters != null)
{
foreach (SqlParameter 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;
}

/// <summary>
/// 执行存储过程，返回影响的行数
/// </summary>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <param name="rowsAffected">影响的行数</param>
/// <returns></returns>
public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
int result;
connection.Open();
SqlCommand command = BuildIntCommand(connection, storedProcName, parameters);
rowsAffected = command.ExecuteNonQuery();
result = (int)command.Parameters["ReturnValue"].Value;
//Connection.Close();
return result;
}
}

/// <summary>
/// 创建 SqlCommand 对象实例(用来返回一个整数值)
/// </summary>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <returns>SqlCommand 对象实例</returns>
private static SqlCommand BuildIntCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
{
SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
command.Parameters.Add(new SqlParameter("ReturnValue",
SqlDbType.Int, 4, ParameterDirection.ReturnValue,
false, 0, 0, string.Empty, DataRowVersion.Default, null));
return command;
}
#endregion

#region 获取数据库连接字符串GetConncetionString()
/// <summary>
/// 获取数据库连接字符串GetConncetionString()
/// </summary>
/// <returns>返回数据库连接字符串</returns>
public static string GetConnectionString()
{
// string connectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
return connectionString;//返回数据库连接字符串
}
#endregion

/// <summary>
/// 根据唯一ID获取Hashtable
/// </summary>
/// <param name="tableName">表名</param>
/// <param name="pkName">字段主键</param>
/// <param name="pkVal">字段值</param>
/// <returns></returns>
public static Hashtable GetHashtableById(string Sql, string tableName, string pkName, string pkVal)
{
StringBuilder sb = new StringBuilder();
sb.Append("Select " + Sql + " From ").Append(tableName).Append(" Where ").Append(pkName).Append("=@ID");
DataTable dt = GetDataTableBySQL(sb, new SqlParameter[] { new SqlParameter("@ID", pkVal) });
return DataTableToHashtable(dt);
}

/// <summary>
/// DataTable 转 DataTableToHashtable
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static Hashtable DataTableToHashtable(DataTable dt)
{
Hashtable ht = new Hashtable();
foreach (DataRow dr in dt.Rows)
{
for (int i = 0; i < dt.Columns.Count; i++)
{
string key = dt.Columns[i].ColumnName;
ht[key.ToUpper()] = dr[key];
}
}
return ht;
}

/// <summary>
/// 根据 SQL 返回 DataTable 数据集，带参数
/// </summary>
/// <param name="sql">sql语句</param>
/// <param name="param">参数化</param>
/// <returns>DataTable</returns>
private static DataTable GetDataTableBySQL(StringBuilder sb, SqlParameter[] sqlParameter)
{
SqlConnection conn = null;
try
{
conn = new SqlConnection(connectionString);
SqlCommand com = new SqlCommand(sb.ToString(), conn);
if (sqlParameter != null && sqlParameter.Length > 0)
com.Parameters.AddRange(sqlParameter);
conn.Open();
SqlDataReader sqlreader = com.ExecuteReader();
return DataTableToIDataReader(sqlreader);
}
catch (Exception)
{
return null;
}
finally
{
conn.Close();
}
}

/// <summary>
/// 将IDataReader转换为DataTable
/// </summary>
/// <param name="reader"></param>
/// <returns></returns>
public static DataTable DataTableToIDataReader(IDataReader reader)
{
DataTable objDataTable = new DataTable("Table");
int intFieldCount = reader.FieldCount;
for (int intCounter = 0; intCounter < intFieldCount; ++intCounter)
{
objDataTable.Columns.Add(reader.GetName(intCounter).ToUpper(), reader.GetFieldType(intCounter));
}
objDataTable.BeginLoadData();
object[] objValues = new object[intFieldCount];
while (reader.Read())
{
reader.GetValues(objValues);
objDataTable.LoadDataRow(objValues, true);
}
reader.Close();
objDataTable.EndLoadData();
return objDataTable;
}

/// <summary>
/// 返回DataSet
/// </summary>
/// <param name="storedProcName">存储过程名称</param>
/// <param name="parameters">参数</param>
/// <returns></returns>
public static DataSet DataSetProd(string storedProcName, IDataParameter[] parameters)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataSet dataSet = new DataSet();
connection.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
sqlDA.Fill(dataSet);
connection.Close();
return dataSet;
}
}

}
}