JDBC-ODBC - Executing Queries on Flat Files

This section describes how to execute SELECT queries on flat text files through the ODBC driver.

With several rows and columns entered in my flat text files as described in the previous tutorial, I am ready to run a SELECT query statement on those data rows as shown in this sample Java program:

/* OdbcFlatQuery.java
 * Copyright (c) HerongYang.com. All Rights Reserved.
 */
import java.sql.*;
public class OdbcFlatQuery {
  public static void main(String [] args) {
    Connection con = null;
    try {
      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
      con = DriverManager.getConnection("jdbc:odbc:HY_FLAT");
      Statement sta = con.createStatement();

// Running a query that joins two flat files
      ResultSet res = sta.executeQuery(
        "SELECT u.FirstName, u.BirthDate, a.City"
        + " FROM User.txt u, Address.txt a"
        + " WHERE u.AddressID = a.ID");
      System.out.println("List of Users: ");
      while (res.next()) {
         System.out.println(
            "   "+res.getString("FirstName")
           + " born on "+res.getDate("BirthDate")
           + " from "+res.getString("City")
           );
      }
      res.close();

      sta.close();
      con.close();
    } catch (Exception e) {
      System.err.println("Exception: "+e.getMessage());
    }
  }
}

Here is the result I got from this program:

herong> progra~1\java\jdk1.7.0_45\bin\javac
   OdbcFlatQuery.java

herong> progra~1\java\jdk1.7.0_45\bin\java OdbcFlatQuery

List of Users:
   R. Morgan born on 1985-09-09 from Bellevue
   Danielle born on 1979-11-05 from Hull
   Alexander born on 1977-04-12 from W. York
   Rosmarie born on 1983-07-01 from Paris
   Christopher born on 1989-08-11 from Portland

This is perfect. My program and flat files worked as expected:

Table of Contents

 About This Book

 JDBC (Java Database Connectivity) Introduction

 JDK (Java SE) Installation

 Microsoft SQL Server Express Edition

 Microsoft JDBC Driver for SQL Server

 Microsoft JDBC Driver - Query Statements and Result Sets

 Microsoft JDBC Driver - DatabaseMetaData Object

 Microsoft JDBC Driver - DDL Statements

 Microsoft JDBC Driver - DML Statements

 SQL Server - PreparedStatement

 SQL Server CLOB (Character Large Object) - TEXT

 SQL Server BLOB (Binary Large Object) - BLOB

 JDBC-ODBC Bridge Driver - sun.jdbc.odbc.JdbcOdbcDriver

JDBC-ODBC Bridge Driver - Flat Text Files

 JDBC-ODBC - Creating DSN for Flat Test File

 JDBC-ODBC - Connecting to Flat Text Files

 JDBC-ODBC - Getting Flat File Driver Info

 JDBC-ODBC - CREATE TABLE in Flat Text Files

 JDBC-ODBC - Listing Tables with meta.GetTables()

 JDBC-ODBC - Tab Delimited Flat File Data

 JDBC-ODBC - ODBC Configuration for Flat Files

JDBC-ODBC - Executing Queries on Flat Files

 JDBC-ODBC - Missing Flat Data Files

 JDBC-ODBC Bridge Driver - MS Access

 JDBC-ODBC Bridge Driver - MS SQL Server

 Archived Tutorials

 References

 Full Version in PDF/EPUB