下面介紹兩種執行SQL命令的方法，並作出相應地總結，第一種介紹一種常規用法，下面進行做簡要地分析，首先我們需要執行打開數據庫操作首先創建一個MySqlConnection對象，在其構造函數中傳入一個連接字符串，然后執行Open操作打開數據庫，在正確打開數據庫之后我們才能進行相關的動作，在ExecuteSQL這個函數中，
我們執行MySqlCommand myCmd = new MySqlCommand(CmdString, conn)，從而創建MySqlCommand對象，其中傳入的兩個參數分別為sql命令和第一步建立的MySqlConnection對象，然后執行int Cmd = myCmd.ExecuteNonQuery()這一句執行相應的命令，並返回受影響的行數，最后我們需要關閉數據庫連接，並釋放非托管資源，從而完成整個數據庫操作的過程;這個是比較常規的一種做法，也是我們使用比較多的一種形式。
public class DataBaseMySqlHelper
{
string connstr;
MySqlConnection conn;
//Server=xxxxxxx;Database=xxxxxxx;Uid=xxxxxxx;Pwd=xxxxxxx;CharSet=gbk;
//Server=xxx.xx.xxx.xx;Database=MSUP;Uid=dvision;Pwd=dvision;Port=xxxx;allow zero datetime = true;
MainWindow _MainWindow;
public DataBaseMySqlHelper(MainWindow mainWindow)
{
_MainWindow = mainWindow;
connstr = _MainWindow._ConfigInfo.MySqlConnectionStrings;
}
public DataBaseMySqlHelper(MainWindow mainWindow, string connectionString)
{
_MainWindow = mainWindow;
connstr = connectionString;
}
/// <summary>
/// 打開數據庫連接
/// </summary>
void Open()
{
try
{
conn = new MySqlConnection(connstr);
conn.Open();
}
catch (Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.Message);
}
}
/// <summary>
/// 關閉數據庫連接
/// </summary>
void Close()
{
conn.Close();
}
/// <summary>
/// 返回影響數據庫的行數
/// </summary>
/// <param name="CmdString"></param>
/// <returns></returns>
public int ExecuteSQL(string CmdString)
{
try
{
Open();
MySqlCommand myCmd = new MySqlCommand(CmdString, conn);
int Cmd = myCmd.ExecuteNonQuery();
Close();
return Cmd;
}
catch (Exception ex)
{
_MainWindow.ShowErrorMessage(" MySql數據庫查詢失敗!");
return 0;
}
}
/// <summary>
/// 返回數據表
/// </summary>
/// <param name="CmdString"></param>
/// <returns></returns>
public DataTable GetDataTable(string CmdString)
{
try
{
Open();
DataSet myDs = new DataSet();
MySqlDataAdapter myDa = new MySqlDataAdapter();
myDa.SelectCommand = new MySqlCommand(CmdString, conn);
myDa.Fill(myDs);
Close();
return myDs.Tables[0];
}
catch (Exception e)
{
_MainWindow.ShowErrorMessage(" MySql數據庫查詢失敗!");
return null;
}
}
}
第二種方式，這里也貼出關鍵代碼並做簡要的分析：這里的關鍵是MySqlParameter[]數組的使用，我們在執行SQL語句的時候 DbHelperMySQL.ExecuteSql(strSql.ToString(),parameters);這里的parameters就是MySqlParameter[]數組，里面存儲的是每個字段的數據，我們將在下面的代碼中展示parameters的內容，
/// <summary>
/// 增加一條數據
/// </summary>
public void Add(Maticsoft.Model.cameradetail model)
{
StringBuilder strSql=new StringBuilder();
strSql.Append("insert into cameradetail_gis(");
strSql.Append("EncodeDeviceUsername,MatrixIP,EncodeDevicePassword,id,Name,DisplayName,Location,Longitude,Latitude,CameraActive,ServerID,ForwardSvrIP,ForwardSvrPort,EncodeDeviceIP,EncodeDevicePort,CameraType,CameraModel,DeviceChannel,MatrixPort,MatrixChannelNum,VideoStoreServerIP,VideoStoreServerPort,VideoStoreServerUserID,VideoStoreServerPassword,EncodeDeviceModelNum,EncodeDeviceModelName,CameraInstallAddress,CameraStatus)");
strSql.Append(" values (");
strSql.Append("@EncodeDeviceUsername,@MatrixIP,@EncodeDevicePassword,@id,@Name,@DisplayName,@Location,@Longitude,@Latitude,@CameraActive,@ServerID,@ForwardSvrIP,@ForwardSvrPort,@EncodeDeviceIP,@EncodeDevicePort,@CameraType,@CameraModel,@DeviceChannel,@MatrixPort,@MatrixChannelNum,@VideoStoreServerIP,@VideoStoreServerPort,@VideoStoreServerUserID,@VideoStoreServerPassword,@EncodeDeviceModelNum,@EncodeDeviceModelName,@CameraInstallAddress,@CameraStatus)");
MySqlParameter[] parameters = {
new MySqlParameter("@EncodeDeviceUsername", MySqlDbType.VarChar,64),
new MySqlParameter("@MatrixIP", MySqlDbType.VarChar,16),
new MySqlParameter("@EncodeDevicePassword", MySqlDbType.VarChar,64),
new MySqlParameter("@id", MySqlDbType.VarChar,14),
new MySqlParameter("@Name", MySqlDbType.VarChar,100),
new MySqlParameter("@DisplayName", MySqlDbType.VarChar,100),
new MySqlParameter("@Location", MySqlDbType.VarChar,250),
new MySqlParameter("@Longitude", MySqlDbType.VarChar,16),
new MySqlParameter("@Latitude", MySqlDbType.VarChar,16),
new MySqlParameter("@CameraActive", MySqlDbType.Int32,11),
new MySqlParameter("@ServerID", MySqlDbType.VarChar,16),
new MySqlParameter("@ForwardSvrIP", MySqlDbType.VarChar,16),
new MySqlParameter("@ForwardSvrPort", MySqlDbType.VarChar,16),
new MySqlParameter("@EncodeDeviceIP", MySqlDbType.VarChar,16),
new MySqlParameter("@EncodeDevicePort", MySqlDbType.VarChar,6),
new MySqlParameter("@CameraType", MySqlDbType.VarChar,6),
new MySqlParameter("@CameraModel", MySqlDbType.VarChar,6),
new MySqlParameter("@DeviceChannel", MySqlDbType.VarChar,12),
new MySqlParameter("@MatrixPort", MySqlDbType.VarChar,6),
new MySqlParameter("@MatrixChannelNum", MySqlDbType.VarChar,14),
new MySqlParameter("@VideoStoreServerIP", MySqlDbType.VarChar,16),
new MySqlParameter("@VideoStoreServerPort", MySqlDbType.VarChar,6),
new MySqlParameter("@VideoStoreServerUserID", MySqlDbType.VarChar,50),
new MySqlParameter("@VideoStoreServerPassword", MySqlDbType.VarChar,20),
new MySqlParameter("@EncodeDeviceModelNum", MySqlDbType.VarChar,6),
new MySqlParameter("@EncodeDeviceModelName", MySqlDbType.VarChar,50),
new MySqlParameter("@CameraInstallAddress", MySqlDbType.VarChar,250),
new MySqlParameter("@CameraStatus", MySqlDbType.Int32,11)};
parameters[0].Value = model.EncodeDeviceUsername;
parameters[1].Value = model.MatrixIP;
parameters[2].Value = model.EncodeDevicePassword;
parameters[3].Value = model.id;
parameters[4].Value = model.Name;
parameters[5].Value = model.DisplayName;
parameters[6].Value = model.Location;
parameters[7].Value = model.Longitude;
parameters[8].Value = model.Latitude;
parameters[9].Value = model.CameraActive;
parameters[10].Value = model.ServerID;
parameters[11].Value = model.ForwardSvrIP;
parameters[12].Value = model.ForwardSvrPort;
parameters[13].Value = model.EncodeDeviceIP;
parameters[14].Value = model.EncodeDevicePort;
parameters[15].Value = model.CameraType;
parameters[16].Value = model.CameraModel;
parameters[17].Value = model.DeviceChannel;
parameters[18].Value = model.MatrixPort;
parameters[19].Value = model.MatrixChannelNum;
parameters[20].Value = model.VideoStoreServerIP;
parameters[21].Value = model.VideoStoreServerPort;
parameters[22].Value = model.VideoStoreServerUserID;
parameters[23].Value = model.VideoStoreServerPassword;
parameters[24].Value = model.EncodeDeviceModelNum;
parameters[25].Value = model.EncodeDeviceModelName;
parameters[26].Value = model.CameraInstallAddress;
parameters[27].Value = model.CameraStatus;
DbHelperMySQL.ExecuteSql(strSql.ToString(),parameters);
}
這里我們重點來關注DbHelperMySQL.ExecuteSql(strSql.ToString(),parameters)這個函數，函數的源碼如下：
這里面有一個重要的函數PrepareCommand(cmd, connection, null, SQLString, cmdParms)，我們這里也貼出相應地源碼，並做簡要的分析：
這個函數首先是打開數據庫連接，這里面最重要就是講cmdParms里面的參數一個個添加到cmd.Parameters中，然后執行 int rows = cmd.ExecuteNonQuery();命令來執行相應的操作，這是一種決然不同的思路，我們在使用的時候可以考慮這兩種方式來進行數據庫的插入操作！
private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, string cmdText, MySqlParameter[] 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 (MySqlParameter parameter in cmdParms)
{
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
(parameter.Value == null))
{
parameter.Value = DBNull.Value;
}
cmd.Parameters.Add(parameter);
}
}
}
#endregion
/// <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 MySqlParameter[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand())
{
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
throw e;
}
}
}
}
#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 (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
{
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
connection.Close();
throw e;
}
}
}
}
public static int ExecuteSqlByTime(string SQLString, int Times)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
{
try
{
connection.Open();
cmd.CommandTimeout = Times;
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
connection.Close();
throw e;
}
}
}
}
/// <summary>
/// 執行MySql和Oracle滴混合事務
/// </summary>
/// <param name="list">SQL命令行列表</param>
/// <param name="oracleCmdSqlList">Oracle命令行列表</param>
/// <returns>執行結果 0-由於SQL造成事務失敗 -1 由於Oracle造成事務失敗 1-整體事務執行成功</returns>
public static int ExecuteSqlTran(List<CommandInfo> list, List<CommandInfo> oracleCmdSqlList)
{
using (MySqlConnection conn = new MySqlConnection(connectionString))
{
conn.Open();
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = conn;
MySqlTransaction tx = conn.BeginTransaction();
cmd.Transaction = tx;
try
{
foreach (CommandInfo myDE in list)
{
string cmdText = myDE.CommandText;
MySqlParameter[] cmdParms = (MySqlParameter[])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("違背要求"+myDE.CommandText+"必須符合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)
{
//引發事件
myDE.OnSolicitationEvent();
}
}
if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
{
if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
{
tx.Rollback();
throw new Exception("SQL:違背要求" + myDE.CommandText + "必須符合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:違背要求" + myDE.CommandText + "返回值必須大於0");
//return 0;
}
if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
{
tx.Rollback();
throw new Exception("SQL:違背要求" + myDE.CommandText + "返回值必須等於0");
//return 0;
}
continue;
}
int val = cmd.ExecuteNonQuery();
if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)
{
tx.Rollback();
throw new Exception("SQL:違背要求" + myDE.CommandText + "必須有影響行");
//return 0;
}
cmd.Parameters.Clear();
}
string oraConnectionString = PubConstant.GetConnectionString("ConnectionStringPPC");
bool res = OracleHelper.ExecuteSqlTran(oraConnectionString, oracleCmdSqlList);
if (!res)
{
tx.Rollback();
throw new Exception("執行失敗");
// return -1;
}
tx.Commit();
return 1;
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
tx.Rollback();
throw e;
}
catch (Exception e)
{
tx.Rollback();
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 (MySqlConnection conn = new MySqlConnection(connectionString))
{
conn.Open();
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = conn;
MySqlTransaction 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 (MySqlConnection connection = new MySqlConnection(connectionString))
{
MySqlCommand cmd = new MySqlCommand(SQLString, connection);
MySql.Data.MySqlClient.MySqlParameter myParameter = new MySql.Data.MySqlClient.MySqlParameter("@content", SqlDbType.NText);
myParameter.Value = content;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySql.Data.MySqlClient.MySqlException 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 (MySqlConnection connection = new MySqlConnection(connectionString))
{
MySqlCommand cmd = new MySqlCommand(SQLString, connection);
MySql.Data.MySqlClient.MySqlParameter myParameter = new MySql.Data.MySqlClient.MySqlParameter("@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 (MySql.Data.MySqlClient.MySqlException 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 (MySqlConnection connection = new MySqlConnection(connectionString))
{
MySqlCommand cmd = new MySqlCommand(strSQL, connection);
MySql.Data.MySqlClient.MySqlParameter myParameter = new MySql.Data.MySqlClient.MySqlParameter("@fs", SqlDbType.Image);
myParameter.Value = fs;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySql.Data.MySqlClient.MySqlException 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 (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(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 (MySql.Data.MySqlClient.MySqlException e)
{
connection.Close();
throw e;
}
}
}
}
public static object GetSingle(string SQLString, int Times)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(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 (MySql.Data.MySqlClient.MySqlException e)
{
connection.Close();
throw e;
}
}
}
}
/// <summary>
/// 執行查詢語句，返回MySqlDataReader ( 注意：調用該方法后，一定要對MySqlDataReader進行Close )
/// </summary>
/// <param name="strSQL">查詢語句</param>
/// <returns>MySqlDataReader</returns>
public static MySqlDataReader ExecuteReader(string strSQL)
{
MySqlConnection connection = new MySqlConnection(connectionString);
MySqlCommand cmd = new MySqlCommand(strSQL, connection);
try
{
connection.Open();
MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return myReader;
}
catch (MySql.Data.MySqlClient.MySqlException 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 (MySqlConnection connection = new MySqlConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);
command.Fill(ds, "ds");
}
catch (MySql.Data.MySqlClient.MySqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
public static DataSet Query(string SQLString, int Times)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);
command.SelectCommand.CommandTimeout = Times;
command.Fill(ds, "ds");
}
catch (MySql.Data.MySqlClient.MySqlException 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 MySqlParameter[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand())
{
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch (MySql.Data.MySqlClient.MySqlException 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MySqlParameter[]）</param>
public static void ExecuteSqlTran(Hashtable SQLStringList)
{
using (MySqlConnection conn = new MySqlConnection(connectionString))
{
conn.Open();
using (MySqlTransaction trans = conn.BeginTransaction())
{
MySqlCommand cmd = new MySqlCommand();
try
{
//循環
foreach (DictionaryEntry myDE in SQLStringList)
{
string cmdText = myDE.Key.ToString();
MySqlParameter[] cmdParms = (MySqlParameter[])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MySqlParameter[]）</param>
public static int ExecuteSqlTran(System.Collections.Generic.List<CommandInfo> cmdList)
{
using (MySqlConnection conn = new MySqlConnection(connectionString))
{
conn.Open();
using (MySqlTransaction trans = conn.BeginTransaction())
{
MySqlCommand cmd = new MySqlCommand();
try
{ int count = 0;
//循環
foreach (CommandInfo myDE in cmdList)
{
string cmdText = myDE.CommandText;
MySqlParameter[] cmdParms = (MySqlParameter[])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MySqlParameter[]）</param>
public static void ExecuteSqlTranWithIndentity(System.Collections.Generic.List<CommandInfo> SQLStringList)
{
using (MySqlConnection conn = new MySqlConnection(connectionString))
{
conn.Open();
using (MySqlTransaction trans = conn.BeginTransaction())
{
MySqlCommand cmd = new MySqlCommand();
try
{
int indentity = 0;
//循環
foreach (CommandInfo myDE in SQLStringList)
{
string cmdText = myDE.CommandText;
MySqlParameter[] cmdParms = (MySqlParameter[])myDE.Parameters;
foreach (MySqlParameter q in cmdParms)
{
if (q.Direction == ParameterDirection.InputOutput)
{
q.Value = indentity;
}
}
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
foreach (MySqlParameter 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MySqlParameter[]）</param>
public static void ExecuteSqlTranWithIndentity(Hashtable SQLStringList)
{
using (MySqlConnection conn = new MySqlConnection(connectionString))
{
conn.Open();
using (MySqlTransaction trans = conn.BeginTransaction())
{
MySqlCommand cmd = new MySqlCommand();
try
{
int indentity = 0;
//循環
foreach (DictionaryEntry myDE in SQLStringList)
{
string cmdText = myDE.Key.ToString();
MySqlParameter[] cmdParms = (MySqlParameter[])myDE.Value;
foreach (MySqlParameter q in cmdParms)
{
if (q.Direction == ParameterDirection.InputOutput)
{
q.Value = indentity;
}
}
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
foreach (MySqlParameter 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 MySqlParameter[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand())
{
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 (MySql.Data.MySqlClient.MySqlException e)
{
throw e;
}
}
}
}
/// <summary>
/// 執行查詢語句，返回MySqlDataReader ( 注意：調用該方法后，一定要對MySqlDataReader進行Close )
/// </summary>
/// <param name="strSQL">查詢語句</param>
/// <returns>MySqlDataReader</returns>
public static MySqlDataReader ExecuteReader(string SQLString, params MySqlParameter[] cmdParms)
{
MySqlConnection connection = new MySqlConnection(connectionString);
MySqlCommand cmd = new MySqlCommand();
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return myReader;
}
catch (MySql.Data.MySqlClient.MySqlException 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 MySqlParameter[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
try
{
da.Fill(ds, "ds");
cmd.Parameters.Clear();
}
catch (MySql.Data.MySqlClient.MySqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
}
private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, string cmdText, MySqlParameter[] 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 (MySqlParameter parameter in cmdParms)
{
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
(parameter.Value == null))
{
parameter.Value = DBNull.Value;
}
cmd.Parameters.Add(parameter);
}
}
}
#endregion
}