org.teiid.query.sql.lang.Query类的使用及代码示例

x33g5p2x  于2022-01-29 转载在 其他  
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本文整理了Java中org.teiid.query.sql.lang.Query类的一些代码示例，展示了Query类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Query类的具体详情如下：
包路径：org.teiid.query.sql.lang.Query
类名称：Query

Query介绍

[英]A representation of a data query. A query consists of various parts, referred to as clauses. The following list the types of clauses that a query can hold, and their purpose:

CLAUSE          PURPOSE 
=========       ============================================== 
Select          Defines the variables data to be retrieved for 
From			Defines the groups to retrieve data from 
Criteria        Defines constraints on data retrieval ("where") 
GroupBy			Defines how rows being returned should be grouped 
Having			Defines how groups should be filtered, also a criteria 
OrderBy         Defines how the results should be sorted 
Option			Defines any extra options on the query

[中]数据查询的一种表示形式。查询由多个部分组成，称为子句。下面列出了查询可以包含的子句类型及其用途：

CLAUSE          PURPOSE 
=========       ============================================== 
Select          Defines the variables data to be retrieved for 
From			Defines the groups to retrieve data from 
Criteria        Defines constraints on data retrieval ("where") 
GroupBy			Defines how rows being returned should be grouped 
Having			Defines how groups should be filtered, also a criteria 
OrderBy         Defines how the results should be sorted 
Option			Defines any extra options on the query

代码示例

代码示例来源：origin: org.teiid/teiid-olingo

private Query buildSubquery(DocumentNode eResource,
    org.teiid.query.sql.symbol.Expression projected) {
  Select s1 = new Select();
  s1.addSymbol(projected); 
  
  Query q = new Query();
  From from = new From();
  from.addGroup(eResource.getGroupSymbol());
  q.setFrom(from);    
  q.setCriteria(DocumentNode.buildJoinCriteria(eResource, this.ctxQuery));
  
  q.setSelect(s1);
  return q;
}

代码示例来源：origin: org.teiid/teiid-engine

public void visit(Query obj) {
  preVisitVisitor(obj);
  visitNodes(obj.getWith());
  visitNode(obj.getSelect());
  visitNode(obj.getInto());
  visitNode(obj.getFrom());
  visitNode(obj.getCriteria());
  visitNode(obj.getGroupBy());
  visitNode(obj.getHaving());
  visitNode(obj.getOrderBy());
  visitNode(obj.getLimit());
  visitNode(obj.getOption());
  postVisitVisitor(obj);
}
public void visit(RaiseStatement obj) {

代码示例来源：origin: org.teiid/teiid-engine

/**
 * Constructs an instance of this class given all the clauses
 * @param select SELECT clause
 * @param from FROM clause
 * @param criteria WHERE clause
 * @param groupBy GROUP BY clause
 * @param having HAVING clause
 * @param orderBy ORDER BY clause
 * @param option OPTION clause
 */
public Query( Select select, From from, Criteria criteria, GroupBy groupBy, Criteria having, OrderBy orderBy, Option option ) {
  super();
  setSelect( select );
  setFrom( from );
  setCriteria( criteria );
  setGroupBy( groupBy );
  setHaving( having );
  setOrderBy( orderBy );
  setOption( option );
}

代码示例来源：origin: org.teiid/teiid-engine

/**
 * Constructs an instance of this class given the specified clauses
 * @param select SELECT clause
 * @param from FROM clause
 * @param criteria WHERE clause
 * @param orderBy ORDER BY clause
 * @param option OPTION clause
 */
public Query( Select select, From from, Criteria criteria, OrderBy orderBy, Option option ) {
  super();
  setSelect( select );
  setFrom( from );
  setCriteria( criteria );
  setOrderBy( orderBy );
  setOption( option );
}

代码示例来源：origin: org.jboss.teiid/teiid-engine

public boolean hasAggregates() {
  return getGroupBy() != null 
  || getHaving() != null 
  || !AggregateSymbolCollectorVisitor.getAggregates(getSelect(), false).isEmpty();
}

代码示例来源：origin: teiid/teiid

@Test public void testQuery4() {
  Select select = new Select();
  select.addSymbol(new MultipleElementSymbol());
  From from = new From();
  from.addGroup(new GroupSymbol("m.g")); //$NON-NLS-1$
  CompareCriteria cc = new CompareCriteria(new ElementSymbol("e1"), CompareCriteria.EQ, new Constant(new Integer(5))); //$NON-NLS-1$
  CompareCriteria having = new CompareCriteria(new ElementSymbol("e1"), CompareCriteria.GT, new Constant(new Integer(0))); //$NON-NLS-1$
  OrderBy orderBy = new OrderBy();
  orderBy.addVariable(new ElementSymbol("e1")); //$NON-NLS-1$
  
  Query query = new Query();
  query.setSelect(select);
  query.setFrom(from);
  query.setCriteria(cc);
  query.setHaving(having);
  query.setOrderBy(orderBy);
  
  helpTest(query, "SELECT * FROM m.g WHERE e1 = 5 HAVING e1 > 0 ORDER BY e1");		     //$NON-NLS-1$
}

代码示例来源：origin: teiid/teiid

@Test public void testLimitWithOffset() {
  Query query = new Query();
  Select select = new Select(Arrays.asList(new MultipleElementSymbol()));
  From from = new From(Arrays.asList(new UnaryFromClause(new GroupSymbol("a")))); //$NON-NLS-1$
  query.setSelect(select);
  query.setFrom(from);
  query.setLimit(new Limit(new Constant(new Integer(50)), new Constant(new Integer(100))));
  helpTest(query, "SELECT * FROM a LIMIT 50, 100"); //$NON-NLS-1$ 
}

代码示例来源：origin: org.teiid/teiid-engine

public static Query createMatViewQuery(Object matMetadataId, String matTableName, List<? extends Expression> select, boolean isGlobal) {
  Query query = new Query();
  query.setSelect(new Select(select));
  GroupSymbol gs = new GroupSymbol(matTableName);
  gs.setGlobalTable(isGlobal);
  gs.setMetadataID(matMetadataId);
  query.setFrom(new From(Arrays.asList(new UnaryFromClause(gs))));
  return query;
}

代码示例来源：origin: teiid/teiid

@Test public void testCacheMultipleComments() {
  String sql = "/* hello */ /*+ cache */ /* world */ SELECT * FROM t1"; //$NON-NLS-1$
  
  Query query = new Query();
  Select select = new Select();
  select.addSymbol(new MultipleElementSymbol());
  query.setSelect(select);
  From from = new From();
  UnaryFromClause ufc = new UnaryFromClause();
  from.addClause(ufc);
  ufc.setGroup(new GroupSymbol("t1")); //$NON-NLS-1$
  query.setFrom(from);           
  query.setCacheHint(new CacheHint());
  TestParser.helpTest(sql, "/*+ cache */ SELECT * FROM t1", query);         //$NON-NLS-1$
}

代码示例来源：origin: teiid/teiid

/** SELECT y FROM h ORDER BY x */
public static final Query sample1() { 
  Query q2 = new Query();
  Select select = new Select();
  select.addSymbol(new ElementSymbol("y"));        //$NON-NLS-1$
  q2.setSelect(select);        
  From from = new From();
  from.addGroup(new GroupSymbol("h")); //$NON-NLS-1$
  q2.setFrom(from);
  OrderBy orderBy = new OrderBy();
  orderBy.addVariable(new ElementSymbol("x")); //$NON-NLS-1$
  q2.setOrderBy(orderBy); 
  return q2;    
}

代码示例来源：origin: org.jboss.teiid/teiid-engine

private boolean canRaiseInputset(Command command, Collection<ElementSymbol> bindings) {
  // check to see if this is query.
  if (!(command instanceof Query)) {
    return false;
  }
  
  Query query = (Query)command; 
  Criteria crit = query.getCriteria();
  
  if (crit != null && (query.getGroupBy() != null || query.getHaving() != null || query.getLimit() != null)) {
    return false;
  }
  //temporarily remove the criteria
  query.setCriteria(null);
  //just throw away order by
  query.setOrderBy(null);
  
  List<ElementSymbol> references = QueryUtil.getBindingsReferences(query, bindings);
  query.setCriteria(crit);
  
  //if there are any input set bindings in the rest of the command, don't convert
  return references.isEmpty();
}

代码示例来源：origin: org.teiid/teiid-engine

public static Query rowConstructor(List<Expression> select) {
  Query query = new Query();
  query.setSelect(new Select());
  query.getSelect().addSymbols(select);
  query.setRowConstructor(true);
  return query;
}

代码示例来源：origin: org.jboss.teiid/teiid-engine

private Query rewriteGroupBy(Query query) throws TeiidComponentException, TeiidProcessingException {
  if (query.getGroupBy() == null) {
    rewriteAggs = false;
    return query;
  }
  if (isDistinctWithGroupBy(query)) {
    query.getSelect().setDistinct(false);
  }
  rewriteExpressions(query.getGroupBy());
  List<Expression> expr = query.getGroupBy().getSymbols();
  for (Iterator<Expression> iter = expr.iterator(); iter.hasNext();) {
    if (EvaluatableVisitor.willBecomeConstant(iter.next())) {
      iter.remove();
    }
  }
  if (expr.isEmpty()) {
    query.setGroupBy(null);
  }
  return query;
}

代码示例来源：origin: org.teiid/teiid-engine

public TupleSource processQuery(Query query, final VDBMetaData vdb, final TransformationMetadata metadata, final CommandContext cc) throws QueryMetadataException, TeiidComponentException {
  return new ExtractionTupleSource(query.getCriteria(), createIterator(vdb, metadata, cc), cc, vdb, metadata, this);
}

代码示例来源：origin: org.teiid/teiid-olingo

public Query selectQuery() throws TeiidException {
  
  if (!this.exceptions.isEmpty()) {
    throw this.exceptions.get(0);
  }
  Query query = this.context.buildQuery();
  if (this.countQuery) {
    AggregateSymbol aggregateSymbol = new AggregateSymbol(AggregateSymbol.Type.COUNT.name(), false, null);
    Select select = new Select(Arrays.asList(aggregateSymbol));
    query.setSelect(select);
  } else if (this.orderBy != null) {
    if (this.context.getIterator() != null) {
      //currently this doesn't matter as the ordering can only be based upon the parent entity
      ((AggregateSymbol)((AliasSymbol)query.getSelect().getSymbol(query.getSelect().getProjectedSymbols().size() - 1)).getSymbol()).setOrderBy(this.orderBy);
    } else {
      query.setOrderBy(this.orderBy);
    }
  }
  
  if (this.expandOption != null) {
    processExpandOption(this.expandOption, this.context, query, 1, null);
  }
  
  return query;
}

代码示例来源：origin: org.jboss.teiid/teiid-engine

/**
 * Validates SELECT INTO queries.
 * @param query
 * @since 4.2
 */
protected void validateSelectInto(Query query) {
  List<Expression> symbols = query.getSelect().getProjectedSymbols();
  GroupSymbol intoGroup = query.getInto().getGroup();
  validateInto(query, symbols, intoGroup);
}

代码示例来源：origin: org.jboss.teiid/teiid-engine

@Override
  protected TupleSource createTupleSource()
      throws TeiidComponentException, TeiidProcessingException {
    TempTableStore tts = contextStore;
    
    TempTable tt = tts.getOrCreateTempTable(tableName, query, bufferManager, true, false, context, group);
    if (context.getDataObjects() != null) {
      Object id = RelationalPlanner.getTrackableGroup(group, context.getMetadata());
      if (id != null) {
        context.accessedDataObject(id);
      }
    }
    return tt.createTupleSource(query.getProjectedSymbols(), query.getCriteria(), query.getOrderBy());
  }
};

代码示例来源：origin: org.jboss.teiid/teiid-engine

private void correctProjectedTypes(List actualSymbolTypes, Query query) {
  
  List symbols = query.getSelect().getProjectedSymbols();
  
  List newSymbols = SetQuery.getTypedProjectedSymbols(symbols, actualSymbolTypes, this.metadata);
  
  query.getSelect().setSymbols(newSymbols);
}

代码示例来源：origin: teiid/teiid

public void testHasNoCriteria2() {
  Query query = new Query();
  CompareCriteria crit = new CompareCriteria(new Constant("a"), CompareCriteria.EQ, new Constant("b")); //$NON-NLS-1$ //$NON-NLS-2$
  query.setCriteria(crit);        
  assertEquals("Got incorrect answer checking for no criteria", false, RuleValidateWhereAll.hasNoCriteria(query)); //$NON-NLS-1$
}

代码示例来源：origin: teiid/teiid

@Test public void testElementSymbolForms() {
  String sql = "SELECT pm1.g1.e1, e2, pm1.g1.e3 AS a, e4 AS b FROM pm1.g1"; //$NON-NLS-1$
  Query resolvedQuery = (Query) helpResolve(sql);
  helpCheckFrom(resolvedQuery, new String[] { "pm1.g1" }); //$NON-NLS-1$
  helpCheckSelect(resolvedQuery, new String[] { "pm1.g1.e1", "pm1.g1.e2", "a", "b" }); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
  helpCheckElements(resolvedQuery.getSelect(), 
    new String[] { "pm1.g1.e1", "pm1.g1.e2", "pm1.g1.e3", "pm1.g1.e4" }, //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
    new String[] { "pm1.g1.e1", "pm1.g1.e2", "pm1.g1.e3", "pm1.g1.e4" } ); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
  assertEquals("Resolved string form was incorrect ", sql, resolvedQuery.toString()); //$NON-NLS-1$
}

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