便签记录Mysql,Sql server,Sqlite,Access四种数据库的简单连接方式
//using MySql.Data.MySqlClient; #region 执行简单SQL语句,使用MySQL查询 static string strConn = "server=.;database=Data20180608;uid=sa;pwd=123456;integrated Security=SSPI;persist Security info=false;"; ////// 执行SQL语句，返回影响的记录数 /// /// SQL语句 /// 影响的记录数 public static int MyExecuteSql(string SQLString) { using (MySqlConnection connection = new MySqlConnection(strConn)) { using (MySqlCommand cmd = new MySqlCommand(SQLString, connection)) { try { connection.Open(); int rows = cmd.ExecuteNonQuery(); return rows; } catch (System.Data.SqlClient.SqlException e) { connection.Close(); throw e; } } } } /// /// 执行查询语句，返回DataTable /// /// 查询语句 /// DataSet public static DataTable MyQuery(string SQLString) { using (MySqlConnection connection = new MySqlConnection(strConn)) { DataSet ds = new DataSet(); try { connection.Open(); MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection); command.Fill(ds, "ds"); } catch (System.Data.SqlClient.SqlException ex) { throw new Exception(ex.Message); } return ds.Tables[0]; } } #endregion
#region 执行简单SQL语句,使用SQL SERVER查询 static string strConn = "Data Source=.;database=Data20180608;User id=root;Password=123456;pooling=false;CharSet=utf8;port=3306;"; ////// 执行SQL语句，返回影响的记录数 /// /// SQL语句 /// 影响的记录数 public static int ExecuteSql(string SQLString) { using (SqlConnection connection = new SqlConnection(strConn)) { 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; } } } } /// /// 执行查询语句，返回DataTable /// /// 查询语句 /// DataSet public static DataTable Query(string SQLString) { using (SqlConnection connection = new SqlConnection(strConn)) { 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.Tables[0]; } } #endregion
//using System.Data.OleDb; public static string OtherPAth = ""; public static string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="; public static string Sql = String.Empty; #region 执行简单SQL语句,使用OleDb查询 ////// 执行SQL语句，返回影响的记录数 /// /// SQL语句 /// 影响的记录数 public static int ExecuteSql(string SQLString) { using (OleDbConnection connection = new OleDbConnection(strConn + OtherPAth )) { using (OleDbCommand cmd = new OleDbCommand(SQLString, connection)) { try { connection.Open(); int rows = cmd.ExecuteNonQuery(); return rows; } catch (System.Data.SqlClient.SqlException e) { connection.Close(); throw e; } } } } /// /// 执行查询语句，返回DataTable /// /// 查询语句 /// DataSet public static DataTable Query(string SQLString) { using (OleDbConnection connection = new OleDbConnection(strConn + OtherPAth)) { DataSet ds = new DataSet(); try { connection.Open(); OleDbDataAdapter command = new OleDbDataAdapter(SQLString, connection); command.Fill(ds, "ds"); } catch (Exception ex) { System.Windows.Forms.MessageBox.Show(ex.Message); } return ds.Tables[0]; } } /// /// 执行查询语句，返回DataTable /// /// 查询语句 /// DataSet public static DataTable QueryDataName() { using (OleDbConnection connection = new OleDbConnection(strConn + OtherPAth)) { DataTable ds = new DataTable(); try { connection.Open(); ds = connection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" }); } catch (Exception ex) { System.Windows.Forms.MessageBox.Show(ex.Message); } return ds; } } #endregion
public static string strConn = @"Data Source=" + @"F:\资料文档\20190227\CAD\0625AnPin\CadDLLcl\Data\Cad_try0626.db"; public static string Sql = String.Empty; ////// 执行SQL语句，返回影响的记录数 /// /// SQL语句 /// 影响的记录数 public static int ExecuteSql(string SQLString) { using (SQLiteConnection connection = new SQLiteConnection(strConn)) { //事务 using (SQLiteTransaction singleTrans = connection.BeginTransaction(IsolationLevel.ReadCommitted)) { using (SQLiteCommand cmd = new SQLiteCommand(SQLString, connection)) { try { connection.Open(); cmd.Transaction = singleTrans; int rows = cmd.ExecuteNonQuery(); singleTrans.Commit(); return rows; } catch (System.Data.SqlClient.SqlException e) { connection.Close(); singleTrans.Rollback(); throw e; } } } } } /// /// 执行查询语句，返回DataTable /// /// 查询语句 /// < returns > DataSet public static DataTable Query(string SQLString) { using (SQLiteConnection connection = new SQLiteConnection(strConn)) { DataSet ds = new DataSet(); try { connection.Open(); SQLiteDataAdapter command = new SQLiteDataAdapter(SQLString, connection); command.Fill(ds, "ds"); return ds.Tables[0]; } catch (Exception ex) { connection.Close(); throw ex; } } } /// /// 执行存储过程，返回影响的记录数 /// /// SQL语句 /// 影响的记录数 public static int ExecuteProc(string procName, SQLiteParameter[] coll) { using (SQLiteConnection connection = new SQLiteConnection(strConn)) { //事务 using (SQLiteTransaction singleTrans = connection.BeginTransaction(IsolationLevel.ReadCommitted)) { using (SQLiteCommand cmd = new SQLiteCommand(connection)) { try { connection.Open(); for (int i = 0; i < coll.Length; i++) { cmd.Parameters.Add(coll[i]); } cmd.CommandType = CommandType.StoredProcedure; cmd.CommandText = procName; cmd.Transaction = singleTrans; int rows = cmd.ExecuteNonQuery(); singleTrans.Commit(); return rows; } catch (System.Data.SqlClient.SqlException e) { connection.Close(); singleTrans.Rollback(); throw e; } } } } } /// /// 执行带参数的SQL语句，返回影响的记录数 /// /// SQL语句 /// 影响的记录数 public static int ExecuteSqlPar(string sqlPar, SQLiteParameter[] coll) { using (SQLiteConnection connection = new SQLiteConnection(strConn)) { //事务 using (SQLiteTransaction singleTrans = connection.BeginTransaction(IsolationLevel.ReadCommitted)) { using (SQLiteCommand cmd = new SQLiteCommand(connection)) { try { connection.Open(); for (int i = 0; i < coll.Length; i++) { cmd.Parameters.Add(coll[i]); } cmd.CommandType = CommandType.Text; cmd.CommandText = sqlPar; cmd.Transaction = singleTrans; int rows = cmd.ExecuteNonQuery(); singleTrans.Commit(); return rows; } catch (System.Data.SqlClient.SqlException e) { connection.Close(); singleTrans.Rollback(); throw e; } } } } }