首先，需要連接SQLServer數據庫的服務器名稱server、數據庫名database、數據庫用戶名uid以及密碼pwd，如下圖：
然后需要以下數據庫SQL代碼段，還有一個myHelper.cs代碼，粘貼復制即可：
DbHelperSQL.cs代碼：
注意要更改紅框中的內容
using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Data.SqlClient; using System.Configuration; namespace MTBug.sqlHelper { /// <summary> /// 數據訪問抽象基礎類 /// Copyright (C) Maticsoft /// </summary> public abstract class DbHelperSQL { //數據庫連接字符串(web.config來配置)，多數據庫可使用DbHelperSQLP來實現. //public static string connectionString = @"server=localhost;database=MTBugList;uid=sa;pwd=123"; public static string connectionString = @"server=localhost;database=MTBugList;uid=sa;pwd=aaaaaa"; public DbHelperSQL() { //connectionString = @"server=" + System.Net.Dns.GetHostName() + ";database=TianZhong;uid=sa;pwd=" + myHelper.getXMLValue("dbUserPW"); connectionString = @"server=" + myHelper.getXMLValue("dbAddr") + ";database=MTBugList;uid=sa;pwd=" + myHelper.getXMLValue("dbUserPW"); } #region 公用方法 /// <summary> /// 判斷是否存在某表的某個字段 /// </summary> /// <param name="tableName">表名稱</param> /// <param name="columnName">列名稱</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; } 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()); } } 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()); //也可能=0 } if (cmdresult == 0) { return false; } else { return true; } } /// <summary> /// 表是否存在 /// </summary> /// <param name="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; } } public static bool Exists(string strSql, params SqlParameter[] cmdParms) { object obj = GetSingle(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 #region 執行簡單SQL語句 /// <summary> /// 執行SQL語句，返回影響的記錄數 /// </summary> /// <param name="SQLString">SQL語句</param> /// <returns>影響的記錄數</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) { connection.Close(); throw e; } } } } 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) { connection.Close(); throw e; } } } } /// <summary> /// 執行多條SQL語句，實現數據庫事務。 /// </summary> /// <param name="SQLStringList">多條SQL語句</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 0; } } } /// <summary> /// 執行帶一個存儲過程參數的的SQL語句。 /// </summary> /// <param name="SQLString">SQL語句</param> /// <param name="content">參數內容,比如一個字段是格式復雜的文章，有特殊符號，可以通過這個方式添加</param> /// <returns>影響的記錄數</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(); } } } /// <summary> /// 執行帶一個存儲過程參數的的SQL語句。 /// </summary> /// <param name="SQLString">SQL語句</param> /// <param name="content">參數內容,比如一個字段是格式復雜的文章，有特殊符號，可以通過這個方式添加</param> /// <returns>影響的記錄數</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(); } } } /// <summary> /// 向數據庫里插入圖像格式的字段(和上面情況類似的另一種實例) /// </summary> /// <param name="strSQL">SQL語句</param> /// <param name="fs">圖像字節,數據庫的字段類型為image的情況</param> /// <returns>影響的記錄數</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(); } } } /// <summary> /// 執行一條計算查詢結果語句，返回查詢結果（object）。 /// </summary> /// <param name="SQLString">計算查詢結果語句</param> /// <returns>查詢結果（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 null; } else { return obj; } } catch (System.Data.SqlClient.SqlException e) { connection.Close(); throw e; } } } } 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; } } } } /// <summary> /// 執行查詢語句，返回SqlDataReader ( 注意：調用該方法后，一定要對SqlDataReader進行Close ) /// </summary> /// <param name="strSQL">查詢語句</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; } } /// <summary> /// 執行查詢語句，返回DataSet /// </summary> /// <param name="SQLString">查詢語句</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; } } 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 #region 執行帶參數的SQL語句 /// <summary> /// 執行SQL語句，返回影響的記錄數 /// </summary> /// <param name="SQLString">SQL語句</param> /// <returns>影響的記錄數</returns> public static int ExecuteSql(string SQLString, params SqlParameter[] cmdParms) { using (SqlConnection connection = new SqlConnection(connectionString)) { using (SqlCommand cmd = new SqlCommand()) { try { PrepareCommand(cmd, connection, null, SQLString, cmdParms); int rows = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return rows; } catch (System.Data.SqlClient.SqlException e) { throw e; } } } } /// <summary> /// 執行多條SQL語句，實現數據庫事務。 /// </summary> /// <param name="SQLStringList">SQL語句的哈希表（key為sql語句，value是該語句的SqlParameter[]）</param> public static void ExecuteSqlTran(Hashtable SQLStringList) { using (SqlConnection conn = new SqlConnection(connectionString)) { conn.Open(); using (SqlTransaction trans = conn.BeginTransaction()) { SqlCommand cmd = new SqlCommand(); try { //循環 foreach (DictionaryEntry myDE in SQLStringList) { string cmdText = myDE.Key.ToString(); SqlParameter[] cmdParms = (SqlParameter[])myDE.Value; PrepareCommand(cmd, conn, trans, cmdText, cmdParms); int val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); } trans.Commit(); } catch { trans.Rollback(); throw; } } } } /// <summary> /// 執行多條SQL語句，實現數據庫事務。 /// </summary> /// <param name="SQLStringList">SQL語句的哈希表（key為sql語句，value是該語句的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; //循環 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> /// 執行多條SQL語句，實現數據庫事務。 /// </summary> /// <param name="SQLStringList">SQL語句的哈希表（key為sql語句，value是該語句的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; //循環 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> /// 執行多條SQL語句，實現數據庫事務。 /// </summary> /// <param name="SQLStringList">SQL語句的哈希表（key為sql語句，value是該語句的SqlParameter[]）</param> public static void ExecuteSqlTranWithIndentity(Hashtable SQLStringList) { using (SqlConnection conn = new SqlConnection(connectionString)) { conn.Open(); using (SqlTransaction trans = conn.BeginTransaction()) { SqlCommand cmd = new SqlCommand(); try { int indentity = 0; //循環 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, 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> /// 執行一條計算查詢結果語句，返回查詢結果（object）。 /// </summary> /// <param name="SQLString">計算查詢結果語句</param> /// <returns>查詢結果（object）</returns> public static object GetSingle(string SQLString, params SqlParameter[] cmdParms) { using (SqlConnection connection = new SqlConnection(connectionString)) { using (SqlCommand cmd = new SqlCommand()) { try { PrepareCommand(cmd, 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 (Exception e) { Console.WriteLine(e.Message); return null; //throw e; } } } } /// <summary> /// 執行查詢語句，返回SqlDataReader ( 注意：調用該方法后，一定要對SqlDataReader進行Close ) /// </summary> /// <param name="strSQL">查詢語句</param> /// <returns>SqlDataReader</returns> public static SqlDataReader ExecuteReader(string SQLString, params SqlParameter[] cmdParms) { SqlConnection connection = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand(); try { PrepareCommand(cmd, 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> /// 執行查詢語句，返回DataSet /// </summary> /// <param name="SQLString">查詢語句</param> /// <returns>DataSet</returns> public static DataSet Query(string SQLString, params SqlParameter[] cmdParms) { using (SqlConnection connection = new SqlConnection(connectionString)) { SqlCommand cmd = new SqlCommand(); PrepareCommand(cmd, 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, 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 = CommandType.Text;//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 存儲過程操作 /// <summary> /// 執行存儲過程，返回SqlDataReader ( 注意：調用該方法后，一定要對SqlDataReader進行Close ) /// </summary> /// <param name="storedProcName">存儲過程名</param> /// <param name="parameters">存儲過程參數</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> /// 執行存儲過程 /// </summary> /// <param name="storedProcName">存儲過程名</param> /// <param name="parameters">存儲過程參數</param> /// <param name="tableName">DataSet結果中的表名</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> /// 構建 SqlCommand 對象(用來返回一個結果集，而不是一個整數值) /// </summary> /// <param name="connection">數據庫連接</param> /// <param name="storedProcName">存儲過程名</param> /// <param name="parameters">存儲過程參數</param> /// <returns>SqlCommand</returns> private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters) { SqlCommand command = new SqlCommand(storedProcName, connection); command.CommandType = CommandType.StoredProcedure; foreach (SqlParameter parameter in parameters) { if (parameter != null) { // 檢查未分配值的輸出參數,將其分配以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> /// 執行存儲過程，返回影響的行數 /// </summary> /// <param name="storedProcName">存儲過程名</param> /// <param name="parameters">存儲過程參數</param> /// <param name="rowsAffected">影響的行數</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> /// 創建 SqlCommand 對象實例(用來返回一個整數值) /// </summary> /// <param name="storedProcName">存儲過程名</param> /// <param name="parameters">存儲過程參數</param> /// <returns>SqlCommand 對象實例</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 } }
CommandInfo.cs代碼：
using System; using System.Collections.Generic; using System.Text; using System.Data.SqlClient; namespace MTBug.sqlHelper { public enum EffentNextType { /// <summary> /// 對其他語句無任何影響 /// </summary> None, /// <summary> /// 當前語句必須為"select count(1) from .."格式，如果存在則繼續執行，不存在回滾事務 /// </summary> WhenHaveContine, /// <summary> /// 當前語句必須為"select count(1) from .."格式，如果不存在則繼續執行，存在回滾事務 /// </summary> WhenNoHaveContine, /// <summary> /// 當前語句影響到的行數必須大於0，否則回滾事務 /// </summary> ExcuteEffectRows, /// <summary> /// 引發事件-當前語句必須為"select count(1) from .."格式，如果不存在則繼續執行，存在回滾事務 /// </summary> SolicitationEvent } public class CommandInfo { public object ShareObject = null; public object OriginalData = null; event EventHandler _solicitationEvent; public event EventHandler SolicitationEvent { add { _solicitationEvent += value; } remove { _solicitationEvent -= value; } } public void OnSolicitationEvent() { if (_solicitationEvent != null) { _solicitationEvent(this, new EventArgs()); } } public string CommandText; public System.Data.Common.DbParameter[] Parameters; public EffentNextType EffentNextType = EffentNextType.None; public CommandInfo() { } public CommandInfo(string sqlText, SqlParameter[] para) { this.CommandText = sqlText; this.Parameters = para; } public CommandInfo(string sqlText, SqlParameter[] para, EffentNextType type) { this.CommandText = sqlText; this.Parameters = para; this.EffentNextType = type; } } }
myHelper.cs代碼：
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Xml; using System.IO; namespace MTBug { public static class myHelper { public delegate void ShowWarnMessage(string _str); public static event ShowWarnMessage showWarnMessage; public static string xmlPath = System.Environment.CurrentDirectory + "\\Resources\\Config.xml"; public static void mySendMessageToMainWindow(string _str) { if (showWarnMessage != null) { showWarnMessage(_str); } } public static string getXMLValue(string eleName) { try { XmlDocument xmlDoc1 = new XmlDocument(); xmlDoc1.Load(xmlPath); var root = xmlDoc1.DocumentElement; XmlNode nodes = xmlDoc1.SelectSingleNode("//" + eleName); if (nodes != null) { xmlDoc1.Save(xmlPath); return nodes.InnerText.ToString(); } else { XmlElement xe1 = xmlDoc1.CreateElement(eleName);//創建一個<hospitalName>節點 xe1.InnerText = ""; root.AppendChild(xe1); xmlDoc1.Save(xmlPath); return ""; } } catch (Exception tt) { myHelper.errorLogAdd(tt.Message); return ""; } } public static void errorLogAdd(string _str) { try { _str = DateTime.Now.ToString("yyyyMMddhhmmss") + "-" + _str; if (System.IO.File.Exists("C://errorLog.txt")) { StreamWriter sw = new StreamWriter("C://errorLog.txt", true, Encoding.GetEncoding("gb2312")); sw.WriteLine(_str); sw.Flush(); sw.Close(); } else { FileStream fs1 = new FileStream("C://errorLog.txt", FileMode.Create, FileAccess.Write);//創建 StreamWriter sw = new StreamWriter(fs1); sw.WriteLine(_str); sw.Flush(); sw.Close(); fs1.Close(); } } catch { } } } }
完成以上步驟之后，在MainWindow.xaml中添加增、刪、改三個按鈕：
<Canvas x:Name="c_sql" Width="500" Height="150" Canvas.Left="50" Canvas.Top="800" Background="SkyBlue"> <Label x:Name="label1" Height="30" Width="120" Content="數據庫SQL更改" FontFamily="Berlin Sans FB" FontSize="16"/> <Button Canvas.Left="50" Canvas.Top="50" Content="添加" Height="60" Name="button1" Width="100" Click="button1_Click" FontSize="20"/> <Button Canvas.Left="200" Canvas.Top="50" Content="刪除" Height="60" Name="button2" Width="100" Click="button2_Click" FontSize="20"/> <Button Canvas.Left="350" Canvas.Top="50" Content="更新" Height="60" Name="button3" Width="100" Click="button3_Click" FontSize="20"/> </Canvas>
項目中新建一個類test.cs，代碼如下：
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data.SqlClient; using System.Data; namespace MTBug.sqlHelper { [Serializable] public partial class test { public test() { } #region Model private int _ids; private string _name; public int ids { set{ _ids = value;} get{ return _ids;} } public string name { set{ _name = value;} get{ return _name;} } #endregion Model #region Model /// <summary> /// 增加一條數據 /// </summary> public int Add(int ids, string username) { ////string _str = "insert into [test] (ids,name) values (" + ids.ToString() + "," + "'"+username.ToString()+"'" + ");"; StringBuilder strSql = new StringBuilder(); strSql.Append("insert into [test] ("); strSql.Append(" ids,name) "); strSql.Append(" values ("); strSql.Append(" @ids,@name)"); SqlParameter[] parameters = { new SqlParameter("@ids", SqlDbType.Int,4), new SqlParameter("@name", SqlDbType.VarChar,20)}; parameters[0].Value = ids; parameters[1].Value = username; //StringBuilder strSql = new StringBuilder(); //strSql.Append("insert into [test] ("); //strSql.Append(" ids,name) values ( "); //strSql.Append("@ids,@name)"); //SqlParameter[] parameters = { // new SqlParameter("@ids", SqlDbType.Int,4), // new SqlParameter("@name", SqlDbType.VarChar,20)}; //parameters[0].Value = ids; //parameters[1].Value = username; object obj = DbHelperSQL.GetSingle(strSql.ToString(), parameters); if (obj == null) { return 0; } else { return Convert.ToInt32(obj); } } /// <summary> /// 刪除一條數據 /// </summary> public bool Delete(int ids) { StringBuilder strSql = new StringBuilder(); strSql.Append("delete from [test] "); strSql.Append(" where ids=" + ids.ToString()); int rows = DbHelperSQL.ExecuteSql(strSql.ToString()); if (rows > 0) { return true; } else { return false; } } /// <summary> /// 更新一條數據 /// </summary> public bool Update(int ids, string username) { StringBuilder strSql = new StringBuilder(); strSql.Append("update [test] set "); strSql.Append("name=@name "); strSql.Append(" where ids=@ids "); SqlParameter[] parameters = { new SqlParameter("@ids", SqlDbType.Int,4), new SqlParameter("@name", SqlDbType.VarChar,50)}; parameters[0].Value = ids; parameters[1].Value = username; int rows = DbHelperSQL.ExecuteSql(strSql.ToString(), parameters); if (rows > 0) { return true; } else { return false; } } #endregion Model } }
test代碼中定義如何對數據庫進行增刪改數據的方法。
最后，在MainWindow.xaml.cs后台代碼中設置，三個按鈕的點擊事件：
private void button1_Click(object sender, RoutedEventArgs e) { ///點擊往test表里隨機插入一條數據 /// test _u = new test(); int _ds = _u.Add(2, "你好"); } private void button2_Click(object sender, RoutedEventArgs e) { test _u = new test(); bool _ds = _u.Delete(2); } private void button3_Click(object sender, RoutedEventArgs e) { test _u = new test(); bool _ds = _u.Update(2, "歐文"); }
查看數據庫的表test，數據就可以增刪改了。
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出錯地點總結：
①增刪改數據庫的方法類型要與相對應的方法類型一致：
對比：
②傳遞的參數要對應：
③編寫sql語句要正確，尤其字符串要加上，單引號‘’。
例：insert into [MTBugList].[dbo].[test] (ids,name) values (3,'你好');
④有兩種C#sql語句的寫法：
第一種：
/// <summary> /// 增加一條數據 /// </summary> public int Add(int ids, string username) { string _str = "insert into [test] (ids,name) values (" + ids.ToString() + "," + "'" + username.ToString() + "'" + ");"; object obj = DbHelperSQL.GetSingle(_str.ToString()); if (obj == null) { return 0; } else { return Convert.ToInt32(obj); } }
第二種：
/// <summary> /// 增加一條數據 /// </summary> public int Add(int ids, string username) { StringBuilder strSql = new StringBuilder(); strSql.Append("insert into [test] ("); strSql.Append(" ids,name) "); strSql.Append(" values ("); strSql.Append(" @ids,@name)"); SqlParameter[] parameters = { new SqlParameter("@ids", SqlDbType.Int,4), new SqlParameter("@name", SqlDbType.VarChar,20)}; parameters[0].Value = ids; parameters[1].Value = username; object obj = DbHelperSQL.GetSingle(strSql.ToString(), parameters); if (obj == null) { return 0; } else { return Convert.ToInt32(obj); } }
⑤注意④中含多個字段時，parameters[？].Value要隨着更改。
