using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace DAL
{
/// <summary>
/// 针对SQLServer数据库的通用访问类
/// </summary>
public class SQLHelper
{
//封装数据库连接字符串
private static string connString = ConfigurationManager.ConnectionStrings["connString"].ToString();
#region 封装格式化SQL语句执行的各种方法
public static int Update(string sql)
{
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(sql, conn);
try
{
conn.Open();
return cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
//将异常信息写入日志
//WriteLog(ex.Message);
//throw new Exception("调用public static int Update(string sql)方法时发生错：" + ex.Message);
string errorInfo = "调用public static int Update(string sql)方法时发生错：" + ex.Message;
WriteLog(errorInfo);
throw new Exception(errorInfo);
}
finally
{
conn.Close();
}
}
public static object GetSingleResult(string sql)
{
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(sql, conn);
try
{
conn.Open();
return cmd.ExecuteScalar();
}
catch (Exception ex)
{
//将异常信息写入日志
string errorInfo = "调用public static object GetSingleResult(string sql)方法时发生错：" + ex.Message;
WriteLog(errorInfo);
throw new Exception(errorInfo);
}
finally
{
conn.Close();
}
}
public static SqlDataReader GetReader(string sql)
{
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(sql, conn);
try
{
conn.Open();
return cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
catch (Exception ex)
{
conn.Close();
//将异常信息写入日志
string errorInfo = "调用SqlDataReader GetReader(string sql)方法时发生错：" + ex.Message;
WriteLog(errorInfo);
throw new Exception(errorInfo);
}
}
public static DataSet GetDataSet(string sql)
{
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(sql, conn);
SqlDataAdapter da = new SqlDataAdapter(cmd);//创建数据适配器对象
DataSet ds = new DataSet();//创建一个内存数据集
try
{
conn.Open();
da.Fill(ds);//使用数据适配器填充数据集
return ds;
}
catch (Exception ex)
{
//将异常信息写入日志
string errorInfo = "调用 public static DataSet GetDataSet(string sql)方法时发生错：" + ex.Message;
WriteLog(errorInfo);
throw new Exception(errorInfo);
}
finally
{
conn.Close();
}
}
public static bool UpdateByTran(List<string> sqlList)
{
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
try
{
conn.Open();
cmd.Transaction = conn.BeginTransaction();//开启事务
foreach (string sql in sqlList)
{
cmd.CommandText = sql;
cmd.ExecuteNonQuery();
}
cmd.Transaction.Commit();//提交事务
return true;
}
catch (Exception ex)
{
if (cmd.Transaction != null)
{
cmd.Transaction.Rollback();//回滚事务
}
string errorInfo = "调用UpdateByTran(List<string> sqlList)方法时发生错：" + ex.Message;
WriteLog(errorInfo);
throw new Exception(errorInfo);
}
finally
{
if (cmd.Transaction != null)
{
cmd.Transaction = null;//清空事务
}
conn.Close();
}
}
#endregion
#region 封装带参数SQL语句执行的各种方法
public static int Update(string sql, SqlParameter[] param)
{
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(sql, conn);
try
{
conn.Open();
cmd.Parameters.AddRange(param);//封装参数
return cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
string errorInfo = "调用 public static int Update(string sql,SqlParameter[] param)方法时发生错：" + ex.Message;
WriteLog(errorInfo);
throw ex;
}
finally
{
conn.Close();
}
}
public static object GetSingleResult(string sql, SqlParameter[] param)
{
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(sql, conn);
try
{
conn.Open();
cmd.Parameters.AddRange(param);//封装参数
return cmd.ExecuteScalar();
}
catch (Exception ex)
{
//将异常信息写入日志
string errorInfo = "调用 public static object GetSingleResult(string sql, SqlParameter[] param)方法时发生错：" + ex.Message;
WriteLog(errorInfo);
throw new Exception(errorInfo);
}
finally
{
conn.Close();
}
}
public static SqlDataReader GetReader(string sql, SqlParameter[] param)
{
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(sql, conn);
try
{
conn.Open();
cmd.Parameters.AddRange(param);//封装参数
return cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
catch (Exception ex)
{
conn.Close();
//将异常信息写入日志
string errorInfo = "调用 public static SqlDataReader GetReader(string sql, SqlParameter[] param)方法时发生错：" + ex.Message;
WriteLog(errorInfo);
throw new Exception(errorInfo);
}
}
/// <summary>
/// 启用事务提交多条带参数的SQL语句
/// </summary>
/// <param name="mainSql">主表SQL语句</param>
/// <param name="mainParam">主表SQL语句对应的参数</param>
/// <param name="detailSql">明细表SQL语句</param>
/// <param name="detailParam">明细表SQL语句对应的参数数组集合</param>
/// <returns>返回事务是否执行成功</returns>
public static bool UpdateByTran(string mainSql, SqlParameter[] mainParam,
string detailSql, List<SqlParameter[]> detailParam)
{
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
try
{
conn.Open();
cmd.Transaction = conn.BeginTransaction();//开启事务
if (mainSql != null && mainSql.Length != )
{
cmd.CommandText = mainSql;
cmd.Parameters.AddRange(mainParam);
cmd.ExecuteNonQuery();
}
foreach (SqlParameter[] param in detailParam)
{
cmd.CommandText = detailSql;
cmd.Parameters.Clear();//必须要清除以前的参数
cmd.Parameters.AddRange(param);
cmd.ExecuteNonQuery();
}
cmd.Transaction.Commit();//提交事务
return true;
}
catch (Exception ex)
{
if (cmd.Transaction != null)
{
cmd.Transaction.Rollback();//回滚事务
}
string errorInfo = "调用 public static bool UpdateByTran(string mainSql, SqlParameter[] mainParam, string detailSql, List<SqlParameter[]> detailParam)方法时发生错：" + ex.Message;
WriteLog(errorInfo);
throw new Exception(errorInfo);
}
finally
{
if (cmd.Transaction != null)
{
cmd.Transaction = null;//清空事务
}
conn.Close();
}
}
#endregion
#region 封装调用存储过程执行的各种方法
public static int UpdateByProcedure(string spName, SqlParameter[] param)
{
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(spName, conn);
try
{
conn.Open();
cmd.CommandType = CommandType.StoredProcedure;//声明当前操作是存储过程
cmd.Parameters.AddRange(param);//封装参数
return cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
string errorInfo = "调用 public static int UpdateByProcedure(string spName, SqlParameter[] param)方法时发生错：" + ex.Message;
WriteLog(errorInfo);
throw new Exception(errorInfo);
}
finally
{
conn.Close();
}
}
public static object GetSingleResultByProcedure(string spName, SqlParameter[] param)
{
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(spName, conn);
try
{
conn.Open();
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddRange(param);//封装参数
return cmd.ExecuteScalar();
}
catch (Exception ex)
{
//将异常信息写入日志
string errorInfo = "调用 public static object GetSingleResult(string sql, SqlParameter[] param)方法时发生错：" + ex.Message;
WriteLog(errorInfo);
throw new Exception(errorInfo);
}
finally
{
conn.Close();
}
}
public static SqlDataReader GetReaderByProcedure(string spName, SqlParameter[] param)
{
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(spName, conn);
try
{
conn.Open();
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddRange(param);//封装参数
return cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
catch (Exception ex)
{
conn.Close();
//将异常信息写入日志
string errorInfo = "调用 public static SqlDataReader GetReader(string sql, SqlParameter[] param)方法时发生错：" + ex.Message;
WriteLog(errorInfo);
throw new Exception(errorInfo);
}
}
/// <summary>
/// 启用事务调用带参数的存储过程
/// </summary>
/// <param name="procedureName">存储过程名称</param>
/// <param name="paramArray">存储过程参数数组集合</param>
/// <returns>返回基于事务的存储过程调用是否成功</returns>
public static bool UpdateByTran(string procedureName, List<SqlParameter[]> paramArray)
{
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
try
{
conn.Open();
cmd.CommandType = CommandType.StoredProcedure;//声明当前操作是调用存储过程
cmd.CommandText = procedureName;
cmd.Transaction = conn.BeginTransaction();//开启事务
foreach (SqlParameter[] param in paramArray)
{
cmd.Parameters.Clear();
cmd.Parameters.AddRange(param);
cmd.ExecuteNonQuery();
}
cmd.Transaction.Commit();//提交事务
return true;
}
catch (Exception ex)
{
if (cmd.Transaction != null)
{
cmd.Transaction.Rollback();//回滚事务
}
string errorInfo = "调用 public static bool UpdateByTran(string procedureName,List<SqlParameter[]>paramArray)方法时发生错：" + ex.Message;
WriteLog(errorInfo);
throw new Exception(errorInfo);
}
finally
{
if (cmd.Transaction != null)
{
cmd.Transaction = null;//清空事务
}
conn.Close();
}
}
#endregion
#region 其他方法
private static void WriteLog(string log)
{
FileStream fs = new FileStream("sqlhelper.log", FileMode.Append);
StreamWriter sw = new StreamWriter(fs);
sw.WriteLine(DateTime.Now.ToString() + " " + log);
sw.Close();
fs.Close();
}
#endregion
}
}