Java Expressions类代码示例

import com.mysema.query.support.Expressions; //导入依赖的package包/类
private Expression<?> buildOrderPropertyPathFrom(JoinerQuery<?, ?> joinerQuery, Sort.Order order) {
    PathBuilder<?> builder = new PathBuilder<Object>(joinerQuery.getFrom().getType(), joinerQuery.getFrom().toString());

    PropertyPath path = PropertyPath.from(order.getProperty(), builder.getType());
    Expression<?> sortPropertyExpression = builder;

    while (path != null) {

        if (!path.hasNext() && order.isIgnoreCase()) {
            // if order is ignore-case we have to treat the last path segment as a String.
            sortPropertyExpression = Expressions.stringPath((Path<?>) sortPropertyExpression, path.getSegment()).lower();
        } else {
            sortPropertyExpression = Expressions.path(path.getType(), (Path<?>) sortPropertyExpression, path.getSegment());
        }

        path = path.next();
    }

    return sortPropertyExpression;
}
 

import com.mysema.query.support.Expressions; //导入依赖的package包/类
@Override
@Transactional(readOnly = true)
public OptionalHashMap<String, Long> getOmCounts(MinSupportCountSettings minSupportCountSettings) {

    Expression<String> caseBuilder = new CaseBuilder()
            .when(InitiativeDaoSearchExpressions.INITIATIVE_IS_WAITING).then(new ConstantImpl<>(Show.waiting.name()))
            .when(InitiativeDaoSearchExpressions.INITIATIVE_IS_RUNNING(minSupportCountSettings)).then(new ConstantImpl<>(Show.running.name()))
            .when(InitiativeDaoSearchExpressions.INITIATIVE_IS_PREPARATION).then(new ConstantImpl<>(Show.preparation.name()))
            .when(InitiativeDaoSearchExpressions.INITIATIVE_IS_REVIEW).then(new ConstantImpl<>(Show.review.name()))
            .when(InitiativeDaoSearchExpressions.INITIATIVE_IS_OM_CANCELED).then(new ConstantImpl<>(Show.canceled.name()))
            .when(InitiativeDaoSearchExpressions.INITIATIVE_IS_SENT_TO_PARLIAMENT).then(new ConstantImpl<>(Show.sentToParliament.name()))
            .otherwise(Show.ended.name());
    SimpleExpression<String> simpleExpression = Expressions.as(caseBuilder, "showCategory");
    Map<String, Long> map = queryFactory
            .from(qInitiative)
            .groupBy(simpleExpression)
            .map(simpleExpression, qInitiative.count());

    return new OptionalHashMap<>(map);

}
 

import com.mysema.query.support.Expressions; //导入依赖的package包/类
@Override
@Transactional(readOnly = true)
public OptionalHashMap<String, Long> getPublicCounts(MinSupportCountSettings minSupportCountSettings) {

    Expression<String> caseBuilder = new CaseBuilder()
            .when(InitiativeDaoSearchExpressions.INITIATIVE_IS_WAITING).then(new ConstantImpl<>(Show.waiting.name()))
            .when(InitiativeDaoSearchExpressions.INITIATIVE_IS_RUNNING(minSupportCountSettings)).then(new ConstantImpl<>(Show.running.name()))
            .when(InitiativeDaoSearchExpressions.INITIATIVE_IS_CANCELED).then(new ConstantImpl<>(Show.canceled.name()))
            .when(InitiativeDaoSearchExpressions.INITIATIVE_IS_SENT_TO_PARLIAMENT).then(new ConstantImpl<>(Show.sentToParliament.name()))
            .otherwise(Show.ended.name());
    SimpleExpression<String> simpleExpression = Expressions.as(caseBuilder, "showCategory");
    Map<String, Long> map = queryFactory
            .from(qInitiative)
            .where(InitiativeDaoSearchExpressions.INITIATIVE_PUBLIC_ALL())
            .groupBy(simpleExpression)
            .map(simpleExpression, qInitiative.count());

    return new OptionalHashMap<>(map);

}
 

import com.mysema.query.support.Expressions; //导入依赖的package包/类
@Test
public void sec020201_定数値をカラムとして照会する() {

	Expression<Integer> const1 = Expressions.constant(1);
	Expression<String> const2 = Expressions.constant("string");

	QAuthor a = new QAuthor("a");
	SQLQuery query = queryDslJdbcOperations.newSqlQuery();
	query.from(a);
	List<Tuple> list = queryDslJdbcOperations.query(query, new QTuple(a.id,
			const1, const2));

	for (Tuple tuple : list) {
		Long valId = tuple.get(a.id);
		Integer valConst1 = tuple.get(const1);
		String valConst2 = tuple.get(const2);
		out.println(format("{0}: const1={1}, const2={2}", valId, valConst1,
				valConst2));
	}
}
 

import com.mysema.query.support.Expressions; //导入依赖的package包/类
private CompletableFuture<Page<Style>> handleListStylesWithQuery (final ListStyles listStyles) {
	final BooleanExpression styleInUse = new SQLSubQuery ()
		.from (layerStyle)
		.where (layerStyle.styleId.eq (style.id))
		.exists ();
	
	final AsyncSQLQuery baseQuery = db
		.query()
		.from(style)
		.orderBy (style.name.asc ());

	if (listStyles.getQuery () != null) {
		baseQuery.where (style.name.containsIgnoreCase (listStyles.getQuery ()));
	}
	
	if (listStyles.getStyleType() != null) {
		baseQuery.where (style.styleType.eq(listStyles.getStyleType()));
	}
	
	final AsyncSQLQuery listQuery = baseQuery.clone ();
	
	singlePage (listQuery, listStyles.getPage ());
	
	return baseQuery
		.count ()
		.thenCompose ((count) -> {
			final Page.Builder<Style> builder = new Page.Builder<> ();
			
			addPageInfo (builder, listStyles.getPage (), count);
			
			return listQuery
				.list (new QStyle (style.identification, style.name, style.styleSchemeType, Expressions.constant(""), style.styleType, styleInUse))
				.thenApply ((styles) -> {
					builder.addAll (styles.list ());
					return builder.build ();
				});
		});
}
 

import com.mysema.query.support.Expressions; //导入依赖的package包/类
protected void visitGenericQueryDslMethod(Node node, String queryDslMethod) {
    final Node leftNode = node.getLeft();
    final boolean leftNodeIsLiteral = leftNode instanceof LiteralNode;
    if (leftNodeIsLiteral) {
        // Must transform this left node literal to an expression in order to use QueryDSL expression syntax for operation and right node
        queryDslCode.append(useClass(Expressions.class)).append(".");
        if (leftNode instanceof TemporalLiteralNode) {
            queryDslCode.append("comparableTemplate(").append(useClass(Date.class)).append(".class, \"{0}\", ");
        } else if (leftNode instanceof StringLiteralNode) {
            queryDslCode.append("stringTemplate(\"{0}\", ");
        } else if (leftNode instanceof FloatLiteralNode) {
            queryDslCode.append("numberTemplate(").append(useClass(Float.class)).append(".class, \"{0}\", ");
        } else if (leftNode instanceof LongLiteralNode) {
            queryDslCode.append("numberTemplate(").append(useClass(Long.class)).append(".class, \"{0}\", ");
        } else if (leftNode instanceof DoubleLiteralNode) {
            queryDslCode.append("numberTemplate(").append(useClass(Double.class)).append(".class, \"{0}\", ");
        } else if (leftNode instanceof IntegerLiteralNode) {
            queryDslCode.append("numberTemplate(").append(useClass(Integer.class)).append(".class, \"{0}\", ");
        } else if (leftNode instanceof BooleanLiteralNode) {
            queryDslCode.append("booleanTemplate(\"{0}\", ");
        }
    }
    visitInspectInstance(leftNode);
    if (leftNodeIsLiteral) {
        queryDslCode.append(")");
    }
    queryDslCode.append("." + queryDslMethod + "(");
    visitInspectInstance(node.getRight());
    queryDslCode.append(")");
}
 

import com.mysema.query.support.Expressions; //导入依赖的package包/类
@Test
public void sec020502_CASE式を指定する_検索CASE式() {

	/* 抽出条件を組み立てる。 */
	QTodo a = new QTodo("a");
	SQLQuery query = queryDslJdbcOperations.newSqlQuery();
	query.from(a);

	/* CASE式を組立てる。 */
	Expression<String> doneDesc = Expressions.cases().when(a.doneFlg.eq(1))
			.then("実施済").when(a.dueDt.lt(new LocalDate(2015, 2, 1)))
			.then("未実施(期限内)").otherwise("未実施(期限切)");

	/* 取出すカラムとデータの取出し方を指定してクエリを発行する。 */
	List<Tuple> list = queryDslJdbcOperations.query(query, new QTuple(a.id,
			a.dueDt, a.doneFlg, doneDesc));

	/* クエリの結果を表示する。 */
	for (Tuple tuple : list) {
		Long valId = tuple.get(a.id);
		LocalDate valDueDt = tuple.get(a.dueDt);
		Integer valDoneFlg = tuple.get(a.doneFlg);
		String valDoneDesc = tuple.get(doneDesc);
		out.println(format(
				"{0}: dueDt={1}, doneFlg={2}, doneDesc(CASE)={3}", valId,
				valDueDt, valDoneFlg, valDoneDesc));
	}
}
 

import com.mysema.query.support.Expressions; //导入依赖的package包/类
private Object executeGetDatasetStatus(GetDatasetStatus query) {		
	SQLQuery baseQuery = query().from(datasetStatus)
		.join(dataset).on(dataset.id.eq(datasetStatus.id));
	
	Expression<DatasetStatusInfo> expression = 
			new QDatasetStatusInfo(					
					dataset.identification, 
					datasetStatus.columnsChanged, 
					datasetStatus.filterConditionChanged, 
					datasetStatus.sourceDatasetChanged, 
					datasetStatus.imported, 
					Expressions.constant(false), 
					datasetStatus.sourceDatasetColumnsChanged, 
					datasetStatus.sourceDatasetRevisionChanged);
	
	String datasourceId = query.getDatasetId();
	if(datasourceId == null) {		
		return new TypedList<>(
			DatasetStatusInfo.class,
			
			baseQuery.list(expression));
	} else {
		return
			baseQuery.where(dataset.identification.eq(datasourceId))
			.singleResult(expression);
	}
}
 

import com.mysema.query.support.Expressions; //导入依赖的package包/类
private <T> Expression<T> constExpression(T value) {
	if(value instanceof Serializable) {
		return Expressions.constant(value);
	} else {
		throw new IllegalArgumentException("value is not serializable");
	}
}
 

import com.mysema.query.support.Expressions; //导入依赖的package包/类
private Expression<?>[] asExpressions(Object... args) {
	Expression<?>[] exprArgs = new Expression<?>[args.length];
	
	int i = 0;
	for(Object arg : args) {
		if(arg instanceof Expression) {
			exprArgs[i++] = (Expression<?>)arg;
		} else {
			exprArgs[i++] = Expressions.constant(arg);
		}
	}
	return exprArgs;
}
 

import com.mysema.query.support.Expressions; //导入依赖的package包/类
private BooleanExpression isConfidential () {
	final QLeafLayer leafLayer = new QLeafLayer ("leaf_layer2");
	
	return new SQLSubQuery ()
		.from (groupStructure)
		.join (leafLayer).on (groupStructure.childLayerId.eq (leafLayer.genericLayerId))
		.join (dataset).on (leafLayer.datasetId.eq (dataset.id))
		.join (sourceDataset).on (dataset.sourceDatasetId.eq (sourceDataset.id))
		.where (groupStructure.groupLayerIdentification.eq (genericLayer.identification))
		.where (Expressions.booleanOperation (Ops.EQ, Expressions.constant (true), new SQLSubQuery ().from (sourceDatasetVersion).where (sourceDatasetVersion.sourceDatasetId.eq (sourceDataset.id)).orderBy (sourceDatasetVersion.createTime.desc ()).limit (1).list (sourceDatasetVersion.confidential)))
		.exists ();
}
 

import com.mysema.query.support.Expressions; //导入依赖的package包/类
private BooleanExpression isWmsOnly () {
	final QLeafLayer leafLayer = new QLeafLayer ("leaf_layer2");
	
	return new SQLSubQuery ()
		.from (groupStructure)
		.join (leafLayer).on (groupStructure.childLayerId.eq (leafLayer.genericLayerId))
		.join (dataset).on (leafLayer.datasetId.eq (dataset.id))
		.join (sourceDataset).on (dataset.sourceDatasetId.eq (sourceDataset.id))
		.where (groupStructure.groupLayerIdentification.eq (genericLayer.identification))
		.where (Expressions.booleanOperation (Ops.EQ, Expressions.constant (true), new SQLSubQuery ().from (sourceDatasetVersion).where (sourceDatasetVersion.sourceDatasetId.eq (sourceDataset.id)).orderBy (sourceDatasetVersion.createTime.desc ()).limit (1).list (sourceDatasetVersion.wmsOnly)))
		.exists ();
}
 

import com.mysema.query.support.Expressions; //导入依赖的package包/类
private BooleanExpression isConfidential () {
	return new SQLSubQuery ()
		.from (serviceStructure)
		.join (leafLayer).on (serviceStructure.childLayerId.eq (leafLayer.genericLayerId))
		.join (dataset).on (leafLayer.datasetId.eq (dataset.id))
		.join (sourceDataset).on (dataset.sourceDatasetId.eq (sourceDataset.id))
		.where (serviceStructure.serviceIdentification.eq (genericLayer.identification))
		.where (Expressions.booleanOperation (Ops.EQ, Expressions.constant (true), new SQLSubQuery ().from (sourceDatasetVersion).where (sourceDatasetVersion.sourceDatasetId.eq (sourceDataset.id)).orderBy (sourceDatasetVersion.createTime.desc ()).limit (1).list (sourceDatasetVersion.confidential)))
		.exists ();
}
 

import com.mysema.query.support.Expressions; //导入依赖的package包/类
private BooleanExpression isWmsOnly () {
	return new SQLSubQuery ()
		.from (serviceStructure)
		.join (leafLayer).on (serviceStructure.childLayerId.eq (leafLayer.genericLayerId))
		.join (dataset).on (leafLayer.datasetId.eq (dataset.id))
		.join (sourceDataset).on (dataset.sourceDatasetId.eq (sourceDataset.id))
		.where (serviceStructure.serviceIdentification.eq (genericLayer.identification))
		.where (Expressions.booleanOperation (Ops.EQ, Expressions.constant (true), new SQLSubQuery ().from (sourceDatasetVersion).where (sourceDatasetVersion.sourceDatasetId.eq (sourceDataset.id)).orderBy (sourceDatasetVersion.createTime.desc ()).limit (1).list (sourceDatasetVersion.wmsOnly)))
		.exists ();
}
 

import com.mysema.query.support.Expressions; //导入依赖的package包/类
@Override
public WithBuilder<Q> with(Path<?> alias, Path<?>... columns) {
    Expression<?> columnsCombined = ExpressionUtils.list(Object.class, columns);
    Expression<?> aliasCombined = Expressions.operation(alias.getType(), SQLOps.WITH_COLUMNS, alias, columnsCombined);
    return new WithBuilder<Q>(queryMixin, aliasCombined);
}