Package weka.experiment

Source Code of weka.experiment.InstanceQuery

/*
*    This program is free software; you can redistribute it and/or modify
*    it under the terms of the GNU General Public License as published by
*    the Free Software Foundation; either version 2 of the License, or
*    (at your option) any later version.
*
*    This program is distributed in the hope that it will be useful,
*    but WITHOUT ANY WARRANTY; without even the implied warranty of
*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*    GNU General Public License for more details.
*
*    You should have received a copy of the GNU General Public License
*    along with this program; if not, write to the Free Software
*    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
*    InstanceQuery.java
*    Copyright (C) 1999 University of Waikato, Hamilton, New Zealand
*
*/

package weka.experiment;

import weka.core.Attribute;
import weka.core.FastVector;
import weka.core.Instance;
import weka.core.DenseInstance;
import weka.core.Instances;
import weka.core.Option;
import weka.core.OptionHandler;
import weka.core.RevisionUtils;
import weka.core.SparseInstance;
import weka.core.Utils;

import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Time;
import java.util.Date;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;

/**
* Convert the results of a database query into instances. The jdbc
* driver and database to be used default to "jdbc.idbDriver" and
* "jdbc:idb=experiments.prp". These may be changed by creating
* a java properties file called DatabaseUtils.props in user.home or
* the current directory. eg:<p>
*
* <code><pre>
* jdbcDriver=jdbc.idbDriver
* jdbcURL=jdbc:idb=experiments.prp
* </pre></code><p>
*
* Command line use just outputs the instances to System.out. <p/>
*
<!-- options-start -->
* Valid options are: <p/>
*
* <pre> -Q &lt;query&gt;
*  SQL query to execute.</pre>
*
* <pre> -S
*  Return sparse rather than normal instances.</pre>
*
* <pre> -U &lt;username&gt;
*  The username to use for connecting.</pre>
*
* <pre> -P &lt;password&gt;
*  The password to use for connecting.</pre>
*
* <pre> -D
*  Enables debug output.</pre>
*
<!-- options-end -->
*
* @author Len Trigg (trigg@cs.waikato.ac.nz)
* @version $Revision: 7038 $
*/
public class InstanceQuery
  extends DatabaseUtils
  implements OptionHandler {
 
  /** for serialization */
  static final long serialVersionUID = 718158370917782584L;

  /** Determines whether sparse data is created */
  boolean m_CreateSparseData = false;
 
  /** Query to execute */
  String m_Query = "SELECT * from ?";

  /**
   * Sets up the database drivers
   *
   * @throws Exception if an error occurs
   */
  public InstanceQuery() throws Exception {

    super();
  }

  /**
   * Returns an enumeration describing the available options <p>
   *
   * @return an enumeration of all options
   */
   public Enumeration listOptions () {
     Vector result = new Vector();

     result.addElement(
         new Option("\tSQL query to execute.",
                    "Q",1,"-Q <query>"));
    
     result.addElement(
         new Option("\tReturn sparse rather than normal instances.",
                    "S", 0, "-S"));
    
     result.addElement(
         new Option("\tThe username to use for connecting.",
                    "U", 1, "-U <username>"));
    
     result.addElement(
         new Option("\tThe password to use for connecting.",
                    "P", 1, "-P <password>"));
    
     result.addElement(
         new Option("\tEnables debug output.",
                    "D", 0, "-D"));
    
     return result.elements();
   }

  /**
   * Parses a given list of options.
   *
   <!-- options-start -->
   * Valid options are: <p/>
   *
   * <pre> -Q &lt;query&gt;
   *  SQL query to execute.</pre>
   *
   * <pre> -S
   *  Return sparse rather than normal instances.</pre>
   *
   * <pre> -U &lt;username&gt;
   *  The username to use for connecting.</pre>
   *
   * <pre> -P &lt;password&gt;
   *  The password to use for connecting.</pre>
   *
   * <pre> -D
   *  Enables debug output.</pre>
   *
   <!-- options-end -->
   *
   * @param options the list of options as an array of strings
   * @throws Exception if an option is not supported
   */
  public void setOptions (String[] options)
    throws Exception {

    String      tmpStr;
   
    setSparseData(Utils.getFlag('S',options));

    tmpStr = Utils.getOption('Q',options);
    if (tmpStr.length() != 0)
      setQuery(tmpStr);

    tmpStr = Utils.getOption('U',options);
    if (tmpStr.length() != 0)
      setUsername(tmpStr);

    tmpStr = Utils.getOption('P',options);
    if (tmpStr.length() != 0)
      setPassword(tmpStr);

    setDebug(Utils.getFlag('D',options));
  }

  /**
   * Returns the tip text for this property
   * @return tip text for this property suitable for
   * displaying in the explorer/experimenter gui
   */
  public String queryTipText() {
    return "The SQL query to execute against the database.";
  }
 
  /**
   * Set the query to execute against the database
   * @param q the query to execute
   */
  public void setQuery(String q) {
    m_Query = q;
  }

  /**
   * Get the query to execute against the database
   * @return the query
   */
  public String getQuery() {
    return m_Query;
  }

  /**
   * Returns the tip text for this property
   * @return tip text for this property suitable for
   * displaying in the explorer/experimenter gui
   */
  public String sparseDataTipText() {
    return "Encode data as sparse instances.";
  }

  /**
   * Sets whether data should be encoded as sparse instances
   * @param s true if data should be encoded as a set of sparse instances
   */
  public void setSparseData(boolean s) {
    m_CreateSparseData = s;
  }

  /**
   * Gets whether data is to be returned as a set of sparse instances
   * @return true if data is to be encoded as sparse instances
   */
  public boolean getSparseData() {
    return m_CreateSparseData;
  }

  /**
   * Gets the current settings of InstanceQuery
   *
   * @return an array of strings suitable for passing to setOptions()
   */
  public String[] getOptions () {

    Vector options = new Vector();

    options.add("-Q");
    options.add(getQuery());
    if (getSparseData())
      options.add("-S");

    if (!getUsername().equals("")) {
      options.add("-U");
      options.add(getUsername());
    }

    if (!getPassword().equals("")) {
      options.add("-P");
      options.add(getPassword());
    }

    if (getDebug())
      options.add("-D");

    return (String[]) options.toArray(new String[options.size()]);
  }

  /**
   * Makes a database query using the query set through the -Q option
   * to convert a table into a set of instances
   *
   * @return the instances contained in the result of the query
   * @throws Exception if an error occurs
   */
  public Instances retrieveInstances() throws Exception {
    return retrieveInstances(m_Query);
  }

  /**
   * Makes a database query to convert a table into a set of instances
   *
   * @param query the query to convert to instances
   * @return the instances contained in the result of the query, NULL if the
   *         SQL query doesn't return a ResultSet, e.g., DELETE/INSERT/UPDATE
   * @throws Exception if an error occurs
   */
  public Instances retrieveInstances(String query) throws Exception {

    if (m_Debug)
      System.err.println("Executing query: " + query);
    connectToDatabase();
    if (execute(query) == false) {
      if (m_PreparedStatement.getUpdateCount() == -1) {
        throw new Exception("Query didn't produce results");
      }
      else {
        if (m_Debug)
          System.err.println(m_PreparedStatement.getUpdateCount()
              + " rows affected.");
        close();
        return null;
      }
    }
    ResultSet rs = getResultSet();
    if (m_Debug)
      System.err.println("Getting metadata...");
    ResultSetMetaData md = rs.getMetaData();
    if (m_Debug)
      System.err.println("Completed getting metadata...");
   
   
    // Determine structure of the instances
    int numAttributes = md.getColumnCount();
    int [] attributeTypes = new int [numAttributes];
    Hashtable [] nominalIndexes = new Hashtable [numAttributes];
    FastVector [] nominalStrings = new FastVector [numAttributes];
    for (int i = 1; i <= numAttributes; i++) {
      /* switch (md.getColumnType(i)) {
      case Types.CHAR:
      case Types.VARCHAR:
      case Types.LONGVARCHAR:
      case Types.BINARY:
      case Types.VARBINARY:
      case Types.LONGVARBINARY:*/
     
      switch (translateDBColumnType(md.getColumnTypeName(i))) {
 
      case STRING :
  //System.err.println("String --> nominal");
  attributeTypes[i - 1] = Attribute.NOMINAL;
  nominalIndexes[i - 1] = new Hashtable();
  nominalStrings[i - 1] = new FastVector();
  break;
      case TEXT:
  //System.err.println("Text --> string");
  attributeTypes[i - 1] = Attribute.STRING;
  nominalIndexes[i - 1] = new Hashtable();
  nominalStrings[i - 1] = new FastVector();
  break;
      case BOOL:
  //System.err.println("boolean --> nominal");
  attributeTypes[i - 1] = Attribute.NOMINAL;
  nominalIndexes[i - 1] = new Hashtable();
  nominalIndexes[i - 1].put("false", new Double(0));
  nominalIndexes[i - 1].put("true", new Double(1));
  nominalStrings[i - 1] = new FastVector();
  nominalStrings[i - 1].addElement("false");
  nominalStrings[i - 1].addElement("true");
  break;
      case DOUBLE:
  //System.err.println("BigDecimal --> numeric");
  attributeTypes[i - 1] = Attribute.NUMERIC;
  break;
      case BYTE:
  //System.err.println("byte --> numeric");
  attributeTypes[i - 1] = Attribute.NUMERIC;
  break;
      case SHORT:
  //System.err.println("short --> numeric");
  attributeTypes[i - 1] = Attribute.NUMERIC;
  break;
      case INTEGER:
  //System.err.println("int --> numeric");
  attributeTypes[i - 1] = Attribute.NUMERIC;
  break;
      case LONG:
  //System.err.println("long --> numeric");
  attributeTypes[i - 1] = Attribute.NUMERIC;
  break;
      case FLOAT:
  //System.err.println("float --> numeric");
  attributeTypes[i - 1] = Attribute.NUMERIC;
  break;
      case DATE:
  attributeTypes[i - 1] = Attribute.DATE;
  break;
      case TIME:
  attributeTypes[i - 1] = Attribute.DATE;
  break;
      default:
  //System.err.println("Unknown column type");
  attributeTypes[i - 1] = Attribute.STRING;
      }
    }

    // For sqlite
    // cache column names because the last while(rs.next()) { iteration for
    // the tuples below will close the md object: 
    Vector<String> columnNames = new Vector<String>();
    for (int i = 0; i < numAttributes; i++) {
      columnNames.add(md.getColumnLabel(i + 1));
    }

    // Step through the tuples
    if (m_Debug)
      System.err.println("Creating instances...");
    FastVector instances = new FastVector();
    int rowCount = 0;
    while(rs.next()) {
      if (rowCount % 100 == 0) {
        if (m_Debug)  {
    System.err.print("read " + rowCount + " instances \r");
    System.err.flush();
        }
      }
      double[] vals = new double[numAttributes];
      for(int i = 1; i <= numAttributes; i++) {
  /*switch (md.getColumnType(i)) {
  case Types.CHAR:
  case Types.VARCHAR:
  case Types.LONGVARCHAR:
  case Types.BINARY:
  case Types.VARBINARY:
  case Types.LONGVARBINARY:*/
  switch (translateDBColumnType(md.getColumnTypeName(i))) {
  case STRING :
    String str = rs.getString(i);
   
    if (rs.wasNull()) {
      vals[i - 1] = Utils.missingValue();
    } else {
      Double index = (Double)nominalIndexes[i - 1].get(str);
      if (index == null) {
        index = new Double(nominalStrings[i - 1].size());
        nominalIndexes[i - 1].put(str, index);
        nominalStrings[i - 1].addElement(str);
      }
      vals[i - 1] = index.doubleValue();
    }
    break;
  case TEXT:
    String txt = rs.getString(i);
   
    if (rs.wasNull()) {
      vals[i - 1] = Utils.missingValue();
    } else {
      Double index = (Double)nominalIndexes[i - 1].get(txt);
      if (index == null) {
        index = new Double(nominalStrings[i - 1].size());
        nominalIndexes[i - 1].put(txt, index);
        nominalStrings[i - 1].addElement(txt);
      }
      vals[i - 1] = index.doubleValue();
    }
    break;
  case BOOL:
    boolean boo = rs.getBoolean(i);
    if (rs.wasNull()) {
      vals[i - 1] = Utils.missingValue();
    } else {
      vals[i - 1] = (boo ? 1.0 : 0.0);
    }
    break;
  case DOUBLE:
    //    BigDecimal bd = rs.getBigDecimal(i, 4);
    double dd = rs.getDouble(i);
    // Use the column precision instead of 4?
    if (rs.wasNull()) {
      vals[i - 1] = Utils.missingValue();
    } else {
      //      newInst.setValue(i - 1, bd.doubleValue());
      vals[i - 1] =  dd;
    }
    break;
  case BYTE:
    byte by = rs.getByte(i);
    if (rs.wasNull()) {
      vals[i - 1] = Utils.missingValue();
    } else {
      vals[i - 1] = (double)by;
    }
    break;
  case SHORT:
    short sh = rs.getShort(i);
    if (rs.wasNull()) {
      vals[i - 1] = Utils.missingValue();
    } else {
      vals[i - 1] = (double)sh;
    }
    break;
  case INTEGER:
    int in = rs.getInt(i);
    if (rs.wasNull()) {
      vals[i - 1] = Utils.missingValue();
    } else {
      vals[i - 1] = (double)in;
    }
    break;
  case LONG:
    long lo = rs.getLong(i);
    if (rs.wasNull()) {
      vals[i - 1] = Utils.missingValue();
    } else {
      vals[i - 1] = (double)lo;
    }
    break;
  case FLOAT:
    float fl = rs.getFloat(i);
    if (rs.wasNull()) {
      vals[i - 1] = Utils.missingValue();
    } else {
      vals[i - 1] = (double)fl;
    }
    break;
  case DATE:
          Date date = rs.getDate(i);
          if (rs.wasNull()) {
      vals[i - 1] = Utils.missingValue();
    } else {
            // TODO: Do a value check here.
            vals[i - 1] = (double)date.getTime();
          }
          break;
  case TIME:
          Time time = rs.getTime(i);
          if (rs.wasNull()) {
      vals[i - 1] = Utils.missingValue();
    } else {
            // TODO: Do a value check here.
            vals[i - 1] = (double) time.getTime();
          }
          break;
  default:
    vals[i - 1] = Utils.missingValue();
  }
      }
      Instance newInst;
      if (m_CreateSparseData) {
  newInst = new SparseInstance(1.0, vals);
      } else {
  newInst = new DenseInstance(1.0, vals);
      }
      instances.addElement(newInst);
      rowCount++;
    }
    //disconnectFromDatabase();  (perhaps other queries might be made)
   
    // Create the header and add the instances to the dataset
    if (m_Debug)
      System.err.println("Creating header...");
    FastVector attribInfo = new FastVector();
    for (int i = 0; i < numAttributes; i++) {
      /* Fix for databases that uppercase column names */
      // String attribName = attributeCaseFix(md.getColumnName(i + 1));
      String attribName = attributeCaseFix(columnNames.get(i));
      switch (attributeTypes[i]) {
      case Attribute.NOMINAL:
  attribInfo.addElement(new Attribute(attribName, nominalStrings[i]));
  break;
      case Attribute.NUMERIC:
  attribInfo.addElement(new Attribute(attribName));
  break;
      case Attribute.STRING:
  Attribute att = new Attribute(attribName, (FastVector) null);
  attribInfo.addElement(att);
  for (int n = 0; n < nominalStrings[i].size(); n++) {
    att.addStringValue((String) nominalStrings[i].elementAt(n));
  }
  break;
      case Attribute.DATE:
  attribInfo.addElement(new Attribute(attribName, (String)null));
  break;
      default:
  throw new Exception("Unknown attribute type");
      }
    }
    Instances result = new Instances("QueryResult", attribInfo,
             instances.size());
    for (int i = 0; i < instances.size(); i++) {
      result.add((Instance)instances.elementAt(i));
    }
    close(rs);
  
    return result;
  }

  /**
   * Test the class from the command line. The instance
   * query should be specified with -Q sql_query
   *
   * @param args contains options for the instance query
   */
  public static void main(String args[]) {

    try {
      InstanceQuery iq = new InstanceQuery();
      String query = Utils.getOption('Q', args);
      if (query.length() == 0) {
  iq.setQuery("select * from Experiment_index");
      } else {
  iq.setQuery(query);
      }
      iq.setOptions(args);
      try {
  Utils.checkForRemainingOptions(args);
      } catch (Exception e) {
  System.err.println("Options for weka.experiment.InstanceQuery:\n");
  Enumeration en = iq.listOptions();
  while (en.hasMoreElements()) {
    Option o = (Option)en.nextElement();
    System.err.println(o.synopsis()+"\n"+o.description());
  }
  System.exit(1);
      }
    
      Instances aha = iq.retrieveInstances();
      iq.disconnectFromDatabase();
      // query returned no result -> exit
      if (aha == null)
        return;
      // The dataset may be large, so to make things easier we'll
      // output an instance at a time (rather than having to convert
      // the entire dataset to one large string)
      System.out.println(new Instances(aha, 0));
      for (int i = 0; i < aha.numInstances(); i++) {
  System.out.println(aha.instance(i));
      }
    } catch(Exception e) {
      e.printStackTrace();
      System.err.println(e.getMessage());
    }
  }
 
  /**
   * Returns the revision string.
   *
   * @return    the revision
   */
  public String getRevision() {
    return RevisionUtils.extract("$Revision: 7038 $");
  }
}
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