Examples of javax.jdo.Query

javax.jdo.Query
The Query interface allows applications to obtain persistent instances, values, and aggregate data from the data store. The {@link PersistenceManager} is the factory for Query instances. There may be many Query instances associated with a PersistenceManager. Multiple queries might be executed simultaneously by different threads, but the implementation might choose to execute them serially. In either case, the implementation must be thread safe.
There are three required elements in a Query: the class of the results, the candidate collection of instances, and the filter.
There are optional elements: parameter declarations, variable declarations, import statements, ordering and grouping specifications, result and result class, the range of results, and flags indicating whether the query result is unique and whether the query can be modified.
The query namespace is modeled after methods in Java:
- setClass corresponds to the class definition
- declareParameters corresponds to formal parameters of a method
- declareVariables corresponds to local variables of a method
- setFilter and setOrdering correspond to the method body
There are two namespaces in queries. Type names have their own namespace that is separate from the namespace for fields, variables and parameters.
The method setClass introduces the name of the candidate class in the type namespace. The method declareImports introduces the names of the imported class or interface types in the type namespace. Imported type names must be unique. When used (e.g. in a parameter declaration, cast expression, etc.) a type name must be the name of the candidate class, the name of a class or interface imported by method declareImports, or denote a class or interface from the same package as the candidate class.
The method setClass introduces the names of the candidate class fields.
The method declareParameters introduces the names of the parameters. A name introduced by declareParameters hides the name of a candidate class field of the same name. Parameter names must be unique.
The method declareVariables introduces the names of the variables. A name introduced by declareVariables hides the name of a candidate class field if equal. Variable names must be unique and must not conflict with parameter names.
The result of the query by default is a list of result class instances, but might be specified via setResult. The class of the result by default is the candidate class, but might be specified via setResultClass.
A hidden field may be accessed using the 'this' qualifier: this.fieldName.
The Query interface provides methods which execute the query based on the parameters given. They return a single instance or a List of result class instances which the user can iterate to get results. The signature of the execute methods specifies that they return an Object which must be cast to the appropriate result by the user.
Any parameters passed to the execute methods are used only for this execution, and are not remembered for future execution. @version 2.1

    try {
      openTransaction();
      LOG.debug("Executing getPartitionNames");
      dbName = dbName.toLowerCase().trim();
      tableName = tableName.toLowerCase().trim();
      Query q = pm.newQuery(
          "select partitionName from org.apache.hadoop.hive.metastore.model.MPartition "
          + "where table.database.name == t1 && table.tableName == t2 "
          + "order by partitionName asc");
      q.declareParameters("java.lang.String t1, java.lang.String t2");
      q.setResult("partitionName");
      Collection names = (Collection) q.execute(dbName, tableName);
      pns = new ArrayList<String>();
      for (Iterator i = names.iterator(); i.hasNext();) {
        pns.add((String) i.next());
      }
      success = commitTransaction();

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    try {
      openTransaction();
      LOG.debug("Executing listMPartitions");
      dbName = dbName.toLowerCase().trim();
      tableName = tableName.toLowerCase().trim();
      Query query = pm.newQuery(MPartition.class,
          "table.tableName == t1 && table.database.name == t2");
      query.declareParameters("java.lang.String t1, java.lang.String t2");
      mparts = (List<MPartition>) query.execute(tableName, dbName);
      LOG.debug("Done executing query for listMPartitions");
      pm.retrieveAll(mparts);
      success = commitTransaction();
      LOG.debug("Done retrieving all objects for listMPartitions");
    } finally {

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      }
      Map<String, String> params = new HashMap<String, String>();
      String queryFilterString =
        makeQueryFilterString(mtable, filter, params);


      Query query = pm.newQuery(MPartition.class,
          queryFilterString);


      if( maxParts >= 0 ) {
        //User specified a row limit, set it on the Query
        query.setRange(0, maxParts);
      }


      LOG.debug("Filter specified is " + filter + "," +
             " JDOQL filter is " + queryFilterString);


      params.put("t1", tableName.trim());
      params.put("t2", dbName.trim());


      String parameterDeclaration = makeParameterDeclarationString(params);
      query.declareParameters(parameterDeclaration);
      query.setOrdering("partitionName ascending");


      mparts = (List<MPartition>) query.executeWithMap(params);


      LOG.debug("Done executing query for listMPartitionsByFilter");
      pm.retrieveAll(mparts);
      success = commitTransaction();
      LOG.debug("Done retrieving all objects for listMPartitionsByFilter");

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      }
      Map<String, String> params = new HashMap<String, String>();
      String queryFilterString =
        makeQueryFilterString(mtable, filter, params);


      Query query = pm.newQuery(
          "select partitionName from org.apache.hadoop.hive.metastore.model.MPartition "
          + "where " + queryFilterString);


      if( maxParts >= 0 ) {
        //User specified a row limit, set it on the Query
        query.setRange(0, maxParts);
      }


      LOG.debug("Filter specified is " + filter + "," +
          " JDOQL filter is " + queryFilterString);
      LOG.debug("Parms is " + params);


      params.put("t1", tableName.trim());
      params.put("t2", dbName.trim());


      String parameterDeclaration = makeParameterDeclarationString(params);
      query.declareParameters(parameterDeclaration);
      query.setOrdering("partitionName ascending");
      query.setResult("partitionName");


      Collection names = (Collection) query.executeWithMap(params);
      partNames = new ArrayList<String>();
      for (Iterator i = names.iterator(); i.hasNext();) {
        partNames.add((String) i.next());
      }

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      if (mtbl == null) {
        commited = commitTransaction();
        return null;
      }


      Query query = pm.newQuery(MIndex.class,
        "origTable.tableName == t1 && origTable.database.name == t2 && indexName == t3");
      query.declareParameters("java.lang.String t1, java.lang.String t2, java.lang.String t3");
      query.setUnique(true);
      midx = (MIndex) query.execute(originalTblName, dbName, indexName);
      pm.retrieve(midx);
      commited = commitTransaction();
    } finally {
      if (!commited) {
        rollbackTransaction();

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    try {
      openTransaction();
      LOG.debug("Executing listMIndexes");
      dbName = dbName.toLowerCase().trim();
      origTableName = origTableName.toLowerCase().trim();
      Query query = pm.newQuery(MIndex.class,
          "origTable.tableName == t1 && origTable.database.name == t2");
      query.declareParameters("java.lang.String t1, java.lang.String t2");
      mindexes = (List<MIndex>) query.execute(origTableName, dbName);
      LOG.debug("Done executing query for listMIndexes");
      pm.retrieveAll(mindexes);
      success = commitTransaction();
      LOG.debug("Done retrieving all objects for listMIndexes");
    } finally {

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    try {
      openTransaction();
      LOG.debug("Executing listIndexNames");
      dbName = dbName.toLowerCase().trim();
      origTableName = origTableName.toLowerCase().trim();
      Query q = pm.newQuery(
          "select indexName from org.apache.hadoop.hive.metastore.model.MIndex "
          + "where origTable.database.name == t1 && origTable.tableName == t2 "
          + "order by indexName asc");
      q.declareParameters("java.lang.String t1, java.lang.String t2");
      q.setResult("indexName");
      Collection names = (Collection) q.execute(dbName, origTableName);
      pns = new ArrayList<String>();
      for (Iterator i = names.iterator(); i.hasNext();) {
        pns.add((String) i.next());
      }
      success = commitTransaction();

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      PrincipalType principalType, String roleName) {
    MRoleMap mRoleMember = null;
    boolean commited = false;
    try {
      openTransaction();
      Query query = pm.newQuery(MRoleMap.class, "principalName == t1 && principalType == t2 && role.roleName == t3");
      query.declareParameters("java.lang.String t1, java.lang.String t2, java.lang.String t3");
      query.setUnique(true);
      mRoleMember = (MRoleMap) query.executeWithArray(userName, principalType.toString(), roleName);
      pm.retrieve(mRoleMember);
      commited = commitTransaction();
    } finally {
      if (!commited) {
        rollbackTransaction();

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    boolean success = false;
    List<MRoleMap> mRoleMember = null;
    try {
      openTransaction();
      LOG.debug("Executing listRoles");
      Query query = pm
          .newQuery(
              MRoleMap.class,
              "principalName == t1 && principalType == t2");
      query
          .declareParameters("java.lang.String t1, java.lang.String t2");
      query.setUnique(false);
      mRoleMember = (List<MRoleMap>) query.executeWithArray(
          principalName, principalType.toString());
      LOG.debug("Done executing query for listMSecurityUserRoleMap");
      pm.retrieveAll(mRoleMember);
      success = commitTransaction();
      LOG.debug("Done retrieving all objects for listMSecurityUserRoleMap");

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    boolean success = false;
    List<MRoleMap> mRoleMemebership = null;
    try {
      openTransaction();
      LOG.debug("Executing listMSecurityPrincipalMembershipRole");
      Query query = pm.newQuery(MRoleMap.class,
          "principalName == t1 && principalType == t2");
      query
          .declareParameters("java.lang.String t1, java.lang.String t2");
      mRoleMemebership = (List<MRoleMap>) query.execute(roleName, principalType.toString());
      LOG
          .debug("Done executing query for listMSecurityPrincipalMembershipRole");
      pm.retrieveAll(mRoleMemebership);
      success = commitTransaction();
      LOG

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