using System; using System.Data; using System.Data.OleDb; public class Transact { public static void Main () { String connect = "Provider=Microsoft.JET.OLEDB.4.0;data source=.Employee.mdb"; OleDbConnection con = new OleDbConnection(connect); con.Open(); Console.WriteLine("Made the connection to the database"); OleDbCommand cmd = con.CreateCommand(); OleDbTransaction trans = con.BeginTransaction(); cmd.Transaction = trans; cmd.CommandText ="INSERT INTO Employee VALUES (12,'CD','wwe',10)"; cmd.ExecuteNonQuery(); trans.Commit(); cmd.CommandText = "SELECT First_name FROM Employee"; OleDbDataReader reader = cmd.ExecuteReader(); while(reader.Read()) Console.WriteLine("{0}", reader.GetString(0)); reader.Close(); con.Close(); } }
OleDbTransaction rollback
using System; using System.Data; using System.Data.OleDb; public class Transact { public static void Main () { String connect = "Provider=Microsoft.JET.OLEDB.4.0;data source=.Employee.mdb"; OleDbConnection con = new OleDbConnection(connect); con.Open(); Console.WriteLine("Made the connection to the database"); OleDbCommand cmd = con.CreateCommand(); OleDbTransaction trans = con.BeginTransaction(); cmd.Transaction = trans; cmd.CommandText ="INSERT INTO Employee VALUES (09,'qwe','ewq',123)"; cmd.ExecuteNonQuery(); cmd.CommandText = "SELECT First_name FROM Employee"; OleDbDataReader reader = cmd.ExecuteReader(); while(reader.Read()) Console.WriteLine("{0}", reader.GetString(0)); reader.Close(); trans.Rollback(); cmd.CommandText = "SELECT First_name FROM Employee"; reader = cmd.ExecuteReader(); Console.WriteLine("Rolled back insert and update -- table unchanged"); Console.WriteLine("First_name"); while(reader.Read()) Console.WriteLine("{0}", reader.GetString(0)); reader.Close(); con.Close(); } }
Use OleDbTransaction
using System; using System.Data; using System.Data.OleDb; public class Transact { public static void Main () { String connect = "Provider=Microsoft.JET.OLEDB.4.0;data source=.Employee.mdb"; OleDbConnection con = new OleDbConnection(connect); con.Open(); Console.WriteLine("Made the connection to the database"); OleDbCommand cmd = con.CreateCommand(); OleDbTransaction trans = con.BeginTransaction(); cmd.Transaction = trans; cmd.CommandText = "UPDATE Employee SET Salary = 1342 " + "WHERE ID > 1"; cmd.ExecuteNonQuery(); cmd.CommandText = "SELECT First_name FROM Employee"; OleDbDataReader reader = cmd.ExecuteReader(); while(reader.Read()) Console.WriteLine("{0}", reader.GetString(0)); reader.Close(); con.Close(); } }
Illustrates transaction processing
using System; using System.Data; using System.Data.OleDb; public class Transact { public static void Main () { String connect = "Provider=Microsoft.JET.OLEDB.4.0;data source=.Employee.mdb"; OleDbConnection con = new OleDbConnection(connect); con.Open(); Console.WriteLine("Made the connection to the database"); OleDbCommand cmd = con.CreateCommand(); OleDbTransaction trans = con.BeginTransaction(); cmd.Transaction = trans; cmd.CommandText ="INSERT INTO Employee VALUES (09,'qwe','ewq',123)"; cmd.ExecuteNonQuery(); cmd.CommandText = "SELECT First_name FROM Employee"; OleDbDataReader reader = cmd.ExecuteReader(); while(reader.Read()) Console.WriteLine("{0}", reader.GetString(0)); reader.Close(); con.Close(); } }
Read query result from OleDbReader
using System; using System.Data.OleDb; public class ReadFromOleDb { [STAThread] static void Main(string[] args) { String sConn = "provider=sqloledb;server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI"; String sSQL = "select id, firstname, lastname from Employee"; OleDbConnection oConn = new OleDbConnection(sConn); oConn.Open(); OleDbCommand oCmd = new OleDbCommand(sSQL, oConn); OleDbDataReader oReader = oCmd.ExecuteReader(); int idxID = oReader.GetOrdinal("id"); int idxFirstName = oReader.GetOrdinal("firstname"); int idxLastName = oReader.GetOrdinal("lastname"); while(oReader.Read()) { Console.WriteLine("{0} {1} {2}", oReader.GetValue(idxID), oReader.GetValue(idxFirstName), oReader.GetValue(idxLastName)); } } }
Format Data from OleDbDataReader
using System; using System.Data; using System.Data.OleDb; class OleDbProvider{ static void Main(string[] args) { String connString = "provider=sqloledb;server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI"; String sql = "select firstname, lastname from Employee"; OleDbConnection conn = null; OleDbDataReader reader = null; try { conn = new OleDbConnection(connString); conn.Open(); OleDbCommand cmd = new OleDbCommand(sql, conn); reader = cmd.ExecuteReader(); Console.WriteLine("Querying database {0} with query {1} " , conn.Database , cmd.CommandText); Console.WriteLine("First Name Last Name "); while(reader.Read()){ Console.WriteLine( "{0} | {1}" , reader["FirstName"].ToString().PadLeft(10) , reader[1].ToString().PadLeft(10) ); } } catch (Exception e) { Console.WriteLine("Error: " + e); } finally { reader.Close(); conn.Close(); } } }
Reference data in OleDbDataReader by column name
using System; using System.Data.OleDb; class MapOleDbReader { static void Main(string[] args) { String sConn = "provider=sqloledb;server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI"; String sSQL = "select id, firstname, lastname from Employee"; OleDbConnection oConn = new OleDbConnection(sConn); oConn.Open(); OleDbCommand oCmd = new OleDbCommand(sSQL, oConn); OleDbDataReader oReader = oCmd.ExecuteReader(); while(oReader.Read()) { Console.WriteLine("{0} {1} {2}", oReader["id"], oReader["firstname"], oReader["lastname"]); } } }