sqlHelper.cs文件样板

using System; using System.Collections.Generic; using System.Text; using System.Collections; using System.Data; using System.Data.SqlClient; using System.Configuration; namespace HelloWinForm.DBUtility { class SQLHelper { #region 通用方法 // 数据连接池 private SqlConnection con; ///

/// 返回数据库连接字符串 ///

/// public static String GetSqlConnection() { String conn = ConfigurationManager.AppSettings["connectionString"].ToString(); return conn; } #endregion #region 执行sql字符串 ///

/// 执行不带参数的SQL语句 ///

/// /// public static int ExecuteSql(String Sqlstr) { String ConnStr = GetSqlConnection(); using (SqlConnection conn = new SqlConnection(ConnStr)) { SqlCommand cmd = new SqlCommand(); cmd.Connection = conn; cmd.CommandText = Sqlstr; conn.Open(); cmd.ExecuteNonQuery(); conn.Close(); return 1; } } ///

/// 执行带参数的SQL语句 ///

/// SQL语句 /// 参数对象数组 /// public static int ExecuteSql(String Sqlstr, SqlParameter[] param) { String ConnStr = GetSqlConnection(); using (SqlConnection conn = new SqlConnection(ConnStr)) { SqlCommand cmd = new SqlCommand(); cmd.Connection = conn; cmd.CommandText = Sqlstr; cmd.Parameters.AddRange(param); conn.Open(); cmd.ExecuteNonQuery(); conn.Close(); return 1; } } ///

/// 返回DataReader ///

/// /// public static SqlDataReader ExecuteReader(String Sqlstr) { String ConnStr = GetSqlConnection(); SqlConnection conn = new SqlConnection(ConnStr);//返回DataReader时,是不可以用using()的 try { SqlCommand cmd = new SqlCommand(); cmd.Connection = conn; cmd.CommandText = Sqlstr; conn.Open(); return cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);//关闭关联的Connection } catch //(Exception ex) { return null; } } ///

/// 执行SQL语句并返回数据表 ///

/// SQL语句 /// public static DataTable ExecuteDt(String Sqlstr) { String ConnStr = GetSqlConnection(); using (SqlConnection conn = new SqlConnection(ConnStr)) { SqlDataAdapter da = new SqlDataAdapter(Sqlstr, conn); DataTable dt = new DataTable(); conn.Open(); da.Fill(dt); conn.Close(); return dt; } } ///

/// 执行SQL语句并返回DataSet ///

/// SQL语句 /// public static DataSet ExecuteDs(String Sqlstr) { String ConnStr = GetSqlConnection(); using (SqlConnection conn = new SqlConnection(ConnStr)) { SqlDataAdapter da = new SqlDataAdapter(Sqlstr, conn); DataSet ds = new DataSet(); conn.Open(); da.Fill(ds); conn.Close(); return ds; } } #endregion #region 操作存储过程 ///

/// 运行存储过程(已重载) ///

/// 存储过程的名字 /// 存储过程的返回值 public int RunProc(string procName) { SqlCommand cmd = CreateCommand(procName, null); cmd.ExecuteNonQuery(); this.Close(); return (int)cmd.Parameters["ReturnValue"].Value; } ///

/// 运行存储过程(已重载) ///

/// 存储过程的名字 /// 存储过程的输入参数列表 /// 存储过程的返回值 public int RunProc(string procName, SqlParameter[] prams) { SqlCommand cmd = CreateCommand(procName, prams); cmd.ExecuteNonQuery(); this.Close(); return (int)cmd.Parameters[0].Value; } ///

/// 运行存储过程(已重载) ///

/// 存储过程的名字 /// 结果集 public void RunProc(string procName, out SqlDataReader dataReader) { SqlCommand cmd = CreateCommand(procName, null); dataReader = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection); } ///

/// 运行存储过程(已重载) ///

/// 存储过程的名字 /// 存储过程的输入参数列表 /// 结果集 public void RunProc(string procName, SqlParameter[] prams, out SqlDataReader dataReader) { SqlCommand cmd = CreateCommand(procName, prams); dataReader = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection); } ///

/// 创建Command对象用于访问存储过程 ///

/// 存储过程的名字 /// 存储过程的输入参数列表 /// Command对象 private SqlCommand CreateCommand(string procName, SqlParameter[] prams) { // 确定连接是打开的 Open(); //command = new SqlCommand( sprocName, new SqlConnection( ConfigManager.DALConnectionString ) ); SqlCommand cmd = new SqlCommand(procName, con); cmd.CommandType = CommandType.StoredProcedure; // 添加存储过程的输入参数列表 if (prams != null) { foreach (SqlParameter parameter in prams) cmd.Parameters.Add(parameter); } // 返回Command对象 return cmd; } ///

/// 创建输入参数 ///

/// 参数名 /// 参数类型 /// 参数大小 /// 参数值 /// 新参数对象 public SqlParameter MakeInParam(string ParamName, SqlDbType DbType, int Size, object Value) { return MakeParam(ParamName, DbType, Size, ParameterDirection.Input, Value); } ///

/// 创建输出参数 ///

/// 参数名 /// 参数类型 /// 参数大小 /// 新参数对象 public SqlParameter MakeOutParam(string ParamName, SqlDbType DbType, int Size) { return MakeParam(ParamName, DbType, Size, ParameterDirection.Output, null); } ///

/// 创建存储过程参数 ///

/// 参数名 /// 参数类型 /// 参数大小 /// 参数的方向(输入/输出) /// 参数值 /// 新参数对象 public SqlParameter MakeParam(string ParamName, SqlDbType DbType, Int32 Size, ParameterDirection Direction, object Value) { SqlParameter param; if (Size > 0) { param = new SqlParameter(ParamName, DbType, Size); } else { param = new SqlParameter(ParamName, DbType); } param.Direction = Direction; if (!(Direction == ParameterDirection.Output && Value == null)) { param.Value = Value; } return param; } #endregion #region 数据库连接和关闭 ///

/// 打开连接池 ///

private void Open() { // 打开连接池 if (con == null) { //这里不仅需要using System.Configuration;还要在引用目录里添加 con = new SqlConnection(GetSqlConnection()); con.Open(); } } ///

/// 关闭连接池 ///

public void Close() { if (con != null) con.Close(); } ///

/// 释放连接池 ///

public void Dispose() { // 确定连接已关闭 if (con != null) { con.Dispose(); con = null; } } #endregion } }