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using System; using System.Collections.Generic; using System.Configuration; using System.Data; using System.Data.SqlClient; using System.Collections; namespace DBUtility { /// <summary> /// 数据库操作类 /// </summary> public abstract class SqlHelper { // 数据库连接 public static readonly string ConnectionStringLocalTransaction = ConfigurationManager.ConnectionStrings["SQLConnString1"].ConnectionString; // 用哈希表缓存参数 private static readonly Hashtable ParmCache = Hashtable.Synchronized(new Hashtable()); /// <summary> /// 执行一个SQL语句(连接字符串) /// </summary> /// <param name="connectionString">连接字符串</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="commandParameters">参数集</param> /// <returns>返回命令影响的行数</returns> public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) { var cmd = new SqlCommand(); using (var conn = new SqlConnection(connectionString)) { PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters); var val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return val; } } /// <summary> /// 执行一个SQL语句(连接对象) /// </summary> /// <param name="connection">一个已经存在的连接对象</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="commandParameters">参数集</param> /// <returns>返回命令影响的行数</returns> public static int ExecuteNonQuery(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) { var cmd = new SqlCommand(); PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters); var val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return val; } /// <summary> /// 执行一个SQL语句(事务) /// </summary> /// <param name="trans">一个已经存在的事务</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="commandParameters">参数集</param> /// <returns>an int representing the number of rows affected by the command</returns> public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) { var cmd = new SqlCommand(); PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters); var val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return val; } /// <summary> /// 执行一个返回DataReader的SQL语句 /// </summary> /// <param name="connectionString">一个有效的连接字符串</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="commandParameters">参数集</param> /// <returns>返回一个DataReader对象</returns> public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) { var cmd = new SqlCommand(); var conn = new SqlConnection(connectionString); // we use a try/catch here because if the method throws an exception we want to // close the connection throw code, because no datareader will exist, hence the // commandBehaviour.CloseConnection will not work try { PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters); var rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection); cmd.Parameters.Clear(); return rdr; } catch { conn.Close(); throw; } } /// <summary> /// 返回DataSet /// </summary> /// <param name="connectionString"></param> /// <param name="cmdText"></param> /// <param name="cmdParms"></param> /// <returns></returns> public static DataSet ExecuteDataSet(string connectionString, string cmdText, params SqlParameter[] cmdParms) { using (var connection = new SqlConnection(connectionString)) { var cmd = new SqlCommand(); PrepareCommand(cmd,connection,null,CommandType.Text,cmdText,cmdParms); using (var da = new SqlDataAdapter(cmd)) { var ds = new DataSet(); try { da.Fill(ds, "ds"); cmd.Parameters.Clear(); } catch (SqlException ex) { throw new Exception(ex.Message); } return ds; } } } /// <summary> /// 根据SQL语句返回DataSet /// </summary> /// <param name="cmdText"></param> /// <param name="cmdParms"></param> /// <returns></returns> public static DataSet Query(string cmdText, params SqlParameter[] cmdParms) { using (var connection = new SqlConnection(ConnectionStringLocalTransaction)) { var cmd = new SqlCommand(); PrepareCommand(cmd, connection, null, CommandType.Text, cmdText, cmdParms); using (var da = new SqlDataAdapter(cmd)) { var ds = new DataSet(); try { da.Fill(ds, "ds"); cmd.Parameters.Clear(); } catch (SqlException ex) { throw new Exception(ex.Message); } return ds; } } } /// <summary> /// 执行返回一个对象的SQL语句(连接字符串) /// </summary> /// <param name="connectionString">连接字符串</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="commandParameters">参数集</param> /// <returns>返回一个object对象，对象中只包含一列。</returns> public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) { var cmd = new SqlCommand(); using (var connection = new SqlConnection(connectionString)) { PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters); var val = cmd.ExecuteScalar(); cmd.Parameters.Clear(); return val; } } /// <summary> /// 执行返回一个对象的SQL语句(连接对象) /// </summary> /// <param name="connection">一个已经存在的连接对象</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="commandParameters">参数集</param> /// <returns>返回一个object对象，对象中只包含一列。</returns> public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) { var cmd = new SqlCommand(); PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters); var val = cmd.ExecuteScalar(); cmd.Parameters.Clear(); return val; } /// <summary> /// 添加参数集到缓存 /// </summary> /// <param name="cacheKey">缓存的名称</param> /// <param name="commandParameters">要缓存的参数集</param> public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters) { ParmCache[cacheKey] = commandParameters; } /// <summary> /// 从缓存中获取参数集 /// </summary> /// <param name="cacheKey">key used to lookup parameters</param> /// <returns>Cached SqlParamters array</returns> public static SqlParameter[] GetCachedParameters(string cacheKey) { var cachedParms = (SqlParameter[])ParmCache[cacheKey]; if (cachedParms == null) return null; var clonedParms = new SqlParameter[cachedParms.Length]; var j = cachedParms.Length; for (var i = 0; i < j; i++) clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone(); return clonedParms; } /// <summary> /// 为执行准备命令对象 /// </summary> /// <param name="cmd">command 对象</param> /// <param name="conn">连接对象</param> /// <param name="trans">事务对象</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="cmdParms">参数集</param> private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, IEnumerable<SqlParameter> cmdParms) { if (conn.State != ConnectionState.Open) conn.Open(); cmd.Connection = conn; cmd.CommandText = cmdText; if (trans != null) cmd.Transaction = trans; cmd.CommandType = cmdType; if (cmdParms == null) return; foreach (var parm in cmdParms) cmd.Parameters.Add(parm); } /// <summary> /// 是否存在记录 /// </summary> /// <param name="strSql"></param> /// <returns></returns> public static bool Exists(string strSql) { var obj = ExecuteScalar(ConnectionStringLocalTransaction, CommandType.Text, strSql); int cmdresult; if ((Equals(obj, null)) || (Equals(obj, DBNull.Value))) { cmdresult = 0; } else { cmdresult = int.Parse(obj.ToString()); } return cmdresult != 0; } /// <summary> /// 是否存在记录 /// </summary> /// <param name="strSql"></param> /// <param name="cmdParms"></param> /// <returns></returns> public static bool Exists(string strSql, params SqlParameter[] cmdParms) { var obj = ExecuteScalar(ConnectionStringLocalTransaction,CommandType.Text,strSql, cmdParms); int cmdresult; if ((Equals(obj, null)) || (Equals(obj, DBNull.Value))) { cmdresult = 0; } else { cmdresult = int.Parse(obj.ToString()); } return cmdresult != 0; } } } |