Examples of com.intersys.gds.query.Query

com.intersys.gds.query.Query
Query is a base class for all ad-hoc GDS query types. It is an abstract class allowing each query subtype to provide it's own execute method. Query implements next method, which returns the next Document returned by the underlying query. It is important to state that the data is not materialized on the Java side until next is called. Query execution merely generates a set of candidate ids, which are then used in next to return the actual Documents. Total number of Documents, after the query has been executed, but before a first call to next is made, is available by calling size. Number of remaining Documents *after* at least one call to next is available by calling itemsLeft. Number of Documents a query can return can be limited by using limit Important: For now only index based queries are supported, meaning data has to have been previously indexed in order for queries to work. Should an attempt be made to run a query and no index is present an exception is thrown.

    * @param key key
    * @param pattern pattern argument
    */
  public  void startsWith(String key, String pattern) {
        System.out.println("StartsWith query. Key = " + key + " startsWith " + pattern);
        Query query = new StartsWith(key,pattern);
        executeQuery(query);
    }

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    * @param from second query from parameter
    * @param to second query to parameter
    */
  public  void and(String key1, String pattern, String key2, int from, int to) {
        System.out.println("key1.startsWith(pattern) AND key2.between(from,to) query.");
        Query query = new And(new StartsWith(key1,pattern),new Between(key2,from,to));
        executeQuery(query);
    }

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    * @param key2 key to be used in second sub-query
    * @param i2 GT query argument
     */
  public   void or(String key1, int i1, String key2, int i2) {
        System.out.println("(key1 < ?) OR (key2 > ?) query.");
        Query query = new Or(new LT(key1,i1),new GT(key2,i2));
        executeQuery(query);
    }

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    * @param from from value
    * @param to to value
    */
  public  void between(String key, int from, int to) {
        System.out.println("Between query. Key = " + key +" between: " + from + " and " + to);
        Query query = new Between(key,from,to);
        query.limit(15);
        executeQuery(query);
    }

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    * @param key key
    * @param value value
    */
  public  void equals(String key, Object value) {
        System.out.println("Equals query. Key = " + key + ", Value = " + value);
        Query query = new Equals(key,value);
        executeQuery(query);
    }

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    * @param key key
    * @param pattern pattern
    */
  public  void patternMatch(String key, String pattern) {
        System.out.println("Pattern Match query. Matching: " + pattern);
        Query query = new PatternMatch(key,pattern);
        executeQuery(query);
    }

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Related Classes of com.intersys.gds.query.Query

com.intersys.gds.Document

com.intersys.gds.test.GDSTest

com.intersys.globals.ValueList

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