/*=====================================================================
File: 	 ExecuteStoredProcedures.java
Summary: This Microsoft JDBC Driver for SQL Server sample application
         demonstrates how to retrieve a large OUT parameter from 
         a stored procedure and how to get the adaptive buffering mode.
---------------------------------------------------------------------
This file is part of the Microsoft JDBC Driver for SQL Server Code Samples.
Copyright (C) Microsoft Corporation.  All rights reserved.
 
This source code is intended only as a supplement to Microsoft
Development Tools and/or on-line documentation.  See these other
materials for detailed information regarding Microsoft code samples.
 
THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF
ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
PARTICULAR PURPOSE.
=====================================================================*/
import java.io.Reader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;

import com.microsoft.sqlserver.jdbc.SQLServerCallableStatement;


public class ExecuteStoredProcedures {

    public static void main(String[] args) {

        String connectionUrl = "jdbc:sqlserver://<server>:<port>;databaseName=AdventureWorks;user=<user>;password=<password>";

		try (Connection con = DriverManager.getConnection(connectionUrl); Statement stmt = con.createStatement()) {

			createTable(stmt);
			createStoredProcedure(stmt);

			// Create test data as an example.
			StringBuffer buffer = new StringBuffer(4000);
			for (int i = 0; i < 4000; i++)
				buffer.append((char) ('A'));

			try (PreparedStatement pstmt = con.prepareStatement(
					"UPDATE Document_JDBC_Sample " + "SET DocumentSummary = ? WHERE (DocumentID = 1)")) {

				pstmt.setString(1, buffer.toString());
				pstmt.executeUpdate();
			}

			// Query test data by using a stored procedure.
			try (SQLServerCallableStatement cstmt = (SQLServerCallableStatement) con
					.prepareCall("{call GetLargeDataValue(?, ?, ?, ?)}")) {

				cstmt.setInt(1, 1);
				cstmt.registerOutParameter(2, java.sql.Types.INTEGER);
				cstmt.registerOutParameter(3, java.sql.Types.CHAR);
				cstmt.registerOutParameter(4, java.sql.Types.LONGVARCHAR);

				// Display the response buffering mode.
				System.out.println("Response buffering mode is: " + cstmt.getResponseBuffering());

				cstmt.execute();
				System.out.println("DocumentID: " + cstmt.getInt(2));
				System.out.println("Document_Title: " + cstmt.getString(3));

				try (Reader reader = cstmt.getCharacterStream(4)) {

					// If your application needs to re-read any portion of the value,
					// it must call the mark method on the InputStream or Reader to
					// start buffering data that is to be re-read after a subsequent
					// call to the reset method.
					reader.mark(4000);

					// Read the first half of data.
					char output1[] = new char[2000];
					reader.read(output1);
					String stringOutput1 = new String(output1);

					// Reset the stream.
					reader.reset();

					// Read all the data.
					char output2[] = new char[4000];
					reader.read(output2);
					String stringOutput2 = new String(output2);

					System.out.println("Document_Summary in half: " + stringOutput1);
					System.out.println("Document_Summary: " + stringOutput2);
				}
			}
		}
        // Handle any errors that may have occurred.
        catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static void createStoredProcedure(Statement stmt) throws SQLException {
        String outputProcedure = "GetLargeDataValue";

        String sql = " IF EXISTS (select * from sysobjects where id = object_id(N'" + outputProcedure
                + "') and OBJECTPROPERTY(id, N'IsProcedure') = 1)" + " DROP PROCEDURE " + outputProcedure;
        stmt.execute(sql);

        sql = "CREATE PROCEDURE " + outputProcedure + " @p0 int, @p1 int OUTPUT, @p2 char(50) OUTPUT, "
                + "@p3 varchar(max) OUTPUT " + " AS" + " SELECT top 1 @p1=DocumentID, @p2=Title,"
                + " @p3=DocumentSummary FROM Document_JDBC_Sample where DocumentID = @p0";

        stmt.execute(sql);
    }

    private static void createTable(Statement stmt) throws SQLException {
        stmt.execute("if exists (select * from sys.objects where name = 'Document_JDBC_Sample')"
                + "drop table Document_JDBC_Sample");

        String sql = "CREATE TABLE Document_JDBC_Sample(" + "[DocumentID] [int] NOT NULL identity,"
                + "[Title] [char](50) NOT NULL," + "[DocumentSummary] [varchar](max) NULL)";

        stmt.execute(sql);

        sql = "INSERT Document_JDBC_Sample VALUES ('title1','summary1') ";
        stmt.execute(sql);

        sql = "INSERT Document_JDBC_Sample VALUES ('title2','summary2') ";
        stmt.execute(sql);

        sql = "INSERT Document_JDBC_Sample VALUES ('title3','summary3') ";
        stmt.execute(sql);
    }
}