/****************************************************************************
** (c) Copyright IBM Corp. 2007 All rights reserved.
**
** The following sample of source code ("Sample") is owned by International
** Business Machines Corporation or one of its subsidiaries ("IBM") and is
** copyrighted and licensed, not sold. You may use, copy, modify, and
** distribute the Sample in any form without payment to IBM, for the purpose of
** assisting you in the development of your applications.
**
** The Sample code is provided to you on an "AS IS" basis, without warranty of
** any kind. IBM HEREBY EXPRESSLY DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR
** IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do
** not allow for the exclusion or limitation of implied warranties, so the above
** limitations or exclusions may not apply to you. IBM shall not be liable for
** any damages you suffer as a result of using, copying, modifying or
** distributing the Sample, even if IBM has been advised of the possibility of
** such damages.
*****************************************************************************
**
** SOURCE FILE NAME: DbUse.cs
**
** SAMPLE: How to use a database with the DB2 .Net Data Provider
**
** SQL Statements USED:
** CREATE TABLE
** DROP TABLE
** DELETE
**
** DB2 .NET Data Provider Classes USED:
** DB2Connection
** DB2Command
** DB2Transaction
**
**
*****************************************************************************
**
** Building and Running the sample program
**
** 1. Compile the DbUse.cs file with bldapp.bat by entering the following
** at the command prompt:
**
** bldapp DbUse
**
** or compile DbUse.cs with the makefile by entering the following at
** the command prompt:
**
** nmake DbUse
**
** 2. Run the DbUse program by entering the program name at the command
** prompt:
**
** DbUse
**
*****************************************************************************
**
** For more information on the sample programs, see the README file.
**
** For information on developing applications, see the Application
** Development Guide.
**
** For information on using SQL statements, see the SQL Reference.
**
** For the latest information on programming, compiling, and running DB2
** applications, visit the DB2 Information Center at
** http://publib.boulder.ibm.com/infocenter/db2luw/v9r7/index.jsp
**
****************************************************************************/
using System;
using System.Data;
using System.IO;
using IBM.Data.DB2;
class DbUse
{
public static void Main(String[] args)
{
// Declare a DB2Connection and a DB2Transaction
DB2Connection conn = null;
DB2Transaction trans = null;
try
{
Console.WriteLine();
Console.WriteLine(" THIS SAMPLE SHOWS HOW TO USE A DATABASE.");
// Connect to a database
Console.WriteLine("\n Connecting to a database ...");
conn = ConnectDb(args);
// Demonstrate how to execute an SQL statement with a DB2Command
trans = conn.BeginTransaction();
ExecCommand(conn,trans);
// Demonstrate how to execute a prepared SQL statement with a
// DB2Command
trans = conn.BeginTransaction();
ExecPreparedCommand(conn,trans);
// Demonstrate how to execute a parameterized SQL statement with a
// DB2Command
trans = conn.BeginTransaction();
ExecPreparedCommandWithParam(conn,trans);
// Disconnect from the database
Console.WriteLine("\n Disconnect from the database.");
conn.Close();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
conn.Close();
}
} // Main
// Helper method: This method establishes a connection to a database
public static DB2Connection ConnectDb(String[] argv)
{
String server = "";
String alias = "";
String userId = "";
String password = "";
Int32 portNumber = -1;
String connectString;
if( argv.Length > 5 ||
( argv.Length == 1 &&
( String.Compare(argv[0],"?") == 0 ||
String.Compare(argv[0],"-?") == 0 ||
String.Compare(argv[0],"/?") == 0 ||
String.Compare(argv[0],"-h",true) == 0 ||
String.Compare(argv[0],"/h",true) == 0 ||
String.Compare(argv[0],"-help",true) == 0 ||
String.Compare(argv[0],"/help",true) == 0 ) ) )
{
throw new Exception(
"Usage: prog_name [dbAlias] [userId passwd] \n" +
" prog_name [dbAlias] server portNum userId passwd");
}
switch (argv.Length)
{
case 0: // Use all defaults
alias = "sample";
userId = "";
password = "";
break;
case 1: // dbAlias specified
alias = argv[0];
userId = "";
password = "";
break;
case 2: // userId & passwd specified
alias = "sample";
userId = argv[0];
password = argv[1];
break;
case 3: // dbAlias, userId & passwd specified
alias = argv[0];
userId = argv[1];
password = argv[2];
break;
case 4: // use default dbAlias
alias = "sample";
server = argv[0];
portNumber = Convert.ToInt32(argv[1]);
userId = argv[2];
password = argv[3];
break;
case 5: // everything specified
alias = argv[0];
server = argv[1];
portNumber = Convert.ToInt32(argv[2]);
userId = argv[3];
password = argv[4];
break;
}
if(portNumber==-1)
{
connectString = "Database=" + alias;
}
else
{
connectString = "Server=" + server + ":" + portNumber +
";Database=" + alias;
}
if(userId != "")
{
connectString += ";UID=" + userId + ";PWD=" + password;
}
DB2Connection conn = new DB2Connection(connectString);
conn.Open();
Console.WriteLine(" Connected to the " + alias + " database");
return conn;
} // ConnectDb
// This method demonstrates how to use a DB2Command to execute an
// SQL statement
public static void ExecCommand(DB2Connection conn, DB2Transaction trans)
{
Console.WriteLine();
Console.WriteLine(
" ----------------------------------------------------------\n" +
" USE THE DB2 .NET DATA PROVIDER CLASS:\n" +
" DB2Command\n" +
" TO EXECUTE AN SQL STATEMENT.");
try
{
// Create a DB2Command
DB2Command cmd = conn.CreateCommand();
// Execute an SQL statement to create a table 't1'
Console.WriteLine();
Console.WriteLine(" CREATE TABLE t1(col1 INTEGER)");
cmd.CommandText = "CREATE TABLE t1(col1 INTEGER)";
cmd.Transaction = trans;
cmd.ExecuteNonQuery();
// Commit the transaction
Console.WriteLine(" COMMIT");
trans.Commit();
// Execute an SQL statement that drops table 't1'
trans = conn.BeginTransaction();
Console.WriteLine(" DROP TABLE t1");
cmd.CommandText = "DROP TABLE t1";
cmd.ExecuteNonQuery();
// Commit the transaction
Console.WriteLine(" COMMIT");
trans.Commit();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
} // ExecCommand
// This method demonstrates how to execute a prepared
// SQL statement using a DB2Command
public static void ExecPreparedCommand(DB2Connection conn,
DB2Transaction trans)
{
Console.WriteLine();
Console.WriteLine(
" ----------------------------------------------------------\n" +
" USE THE DB2 .NET DATA PROVIDER CLASS:\n" +
" DB2Command AND ITS METHOD Prepare()\n" +
" TO EXECUTE A PREPARED SQL STATEMENT.");
try
{
Console.WriteLine();
Console.WriteLine(" Prepare the statement:\n" +
" DELETE FROM org WHERE deptnumb <= 70");
// Prepare the SQL statement
DB2Command cmd = conn.CreateCommand();
cmd.CommandText = "DELETE FROM org WHERE deptnumb <= 70";
cmd.Transaction = trans;
cmd.Prepare();
// Execute the statement
Console.WriteLine();
Console.WriteLine(" Executed the statement");
cmd.ExecuteNonQuery();
// Rollback the transaction
Console.WriteLine();
Console.WriteLine(" ROLLBACK");
trans.Rollback();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
} // ExecPreparedCommand
// This method demonstrates how to execute a parameterized SQL
// statement using a DB2Command
public static void ExecPreparedCommandWithParam(DB2Connection conn,
DB2Transaction trans)
{
Console.WriteLine();
Console.WriteLine(
" ----------------------------------------------------------\n" +
" USE THE DB2 .NET DATA PROVIDER CLASS:\n" +
" DB2Command AND ITS METHOD Prepare()\n" +
" TO EXECUTE A PARAMETERIZED SQL STATEMENT.");
try
{
// Prepare the statement
Console.WriteLine();
Console.WriteLine(
" Prepared the command:\n" +
" DELETE FROM org WHERE deptnumb <= ? AND division = ?");
DB2Command cmd = conn.CreateCommand();
cmd.CommandText = "DELETE FROM org " +
" WHERE deptnumb <= ? " +
" AND division = ?";
cmd.Transaction = trans;
cmd.Prepare();
// Declare the parameters for the statement and set their value
Console.WriteLine();
Console.WriteLine(" Execute the statement for:\n" +
" parameter 1 = 70\n" +
" parameter 2 = 'Eastern'");
cmd.Parameters.Add("@dept", DB2Type.SmallInt).Value = 70;
cmd.Parameters.Add("@division", DB2Type.VarChar, 10).Value = "Eastern";
// Execute the statement
Console.WriteLine("\n Executed the statement");
cmd.ExecuteNonQuery();
// Rollback the transaction
Console.WriteLine();
Console.WriteLine(" ROLLBACK");
trans.Rollback();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
} // ExecPreparedCommandWithParam
} // DbUse